GET PARTWISE README.md FILES HERE

Part 1 : Creating Splash Screen for our App and starting with our Project

Create New Project

Step 1:Create Empty Activity and Name as ->SplashActivity.java

Step 2:Go to activity_splash.xmland change the constraint Layout to ~~constraint Layout~~ Relative Layout

Step 3 : Define an ImageView inside of Realtive Layout(so as to add icon)

code as follows :


<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#ffffff"
    tools:context=".SplashActivity">

    <ImageView
        android:layout_width="120dp"
        android:layout_height="120dp"
        android:src="@drawable/carts"
        android:layout_centerInParent="true"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="eCommerce App All rights reserved "
        android:layout_centerInParent="true"
        android:layout_alignParentBottom="true"
        android:textColor="#626262"
        android:padding="20dp"/>

</RelativeLayout>

Step 4:Come to SplashActivity.java and we will use Handler Method for setting the time of the Splash Screen

Go to OnCreate Method and declare as follows:

new Handler().postDelayed(new Runnable() { @Override public void run() { Intent i = new Intent(SplashActivity.this, MainActivity.class); startActivity(i); finish(); } },3000);

Note: 3000 is the time in miliseconds which corresponds to 3 sec

Step 5: Coming to AndroidManifest.xml

and change the `Splashctivity` to `Launcher Activity` and `MainActivity` TO `DEFAULT` as follows by changing the Intent Filter as follows

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.aips.amit.amite_commerceapp">

    <application
        android:allowBackup="true"
        android:icon="@drawable/carts"
        android:label="@string/app_name"
        android:roundIcon="@drawable/carts"
        android:supportsRtl="true"
        android:theme="@style/Theme.AmitECommerceApp">
        <activity android:name=".SplashActivity"
            android:theme="@style/Theme.AppCompat.NoActionBar">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>
    </application>

</manifest>

‎‎‎ ‎ ‎‎ ‎ ‎ ‎‎‎‎‎‎‎ ‎ ‎‎‎ ‎ ‎‎ ‎ ‎ ‎ ‎‎‎ ‎ ‎‎ ‎ ‎ -------------------------- PART 1 --------------------------

Part 2 : Designing our Login and Register Fragments

Login Fragment	Register Fragment

Note here : You can copy the Atrributes like width or height , copying the whole code may result into error as the id's defined in this project may vary in your case unless you define the same id's in your case

So in the first step we have created a Splash Screen and in this lets design our Activities

Step 1 : Go to the folder where MainActivity.java exists and Create two new Fragments 1.)Sign In Fragments & 2.)Sign Up Fragments

Now lets design first SignInFragments so go to its .xml file and code

~~constraintLayout~~ Frame Layout am=nd give background color as per your need by defining the attribute

android:background="#colorcode"

Now declare constraintLayout inside of FrameLayout for easier Designing

So inside constraintLayout first we will give an imagebutton as you can see in the design above picture

Declare an Close image button for our app icon

Common for both SignInFragment and SignUpFragement

<ImageButton
            android:id="@+id/sign_in_close_btn"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="@android:color/transparent"
            android:padding="16dp"
            android:src="@drawable/ic_baseline_clear_24"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="1.0"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />

Declare an ImageView for our app icon

Common for both SignInFragment and SignUpFragement

Code as follows:

<ImageView
            android:id="@+id/imageView"
            android:layout_width="120dp"
            android:layout_height="120dp"
            android:layout_marginTop="4dp"
            android:src="@drawable/carts"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/sign_in_close_btn" />

Now define two Editext as we are using email and password field where the user will enter the values

‎ ‎‎‎ ‎ ‎‎ ‎ ‎ ‎ ‎‎‎ ‎ ‎‎ ‎SignInFragment Designing Part

Editext for Email id:

<EditText
            android:id="@+id/sign_in_email"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginStart="20dp"
            android:layout_marginTop="20dp"
            android:layout_marginEnd="20dp"
            android:backgroundTint="#902E2929"
            android:ems="10"
            android:hint="Enter Your Email.."
            android:inputType="textEmailAddress"
            android:padding="16dp"
            android:textColor="@color/white"
            android:textColorHint="#902E2929"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.0"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/imageView" />

& EditText for Password:

<EditText
            android:id="@+id/sign_in_password"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginStart="16dp"
            android:layout_marginTop="10dp"
            android:layout_marginEnd="16dp"
            android:backgroundTint="#902e2929"
            android:ems="10"
            android:hint="Enter Password.."
            android:inputType="textPassword"
            android:padding="16dp"
            android:textColor="@color/white"
            android:textColorHint="#902e2929"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/sign_in_email" />

Creating a Forget Password TextView

<TextView
            android:id="@+id/sign_in_forget_password"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="16dp"
            android:layout_marginTop="8dp"
            android:text="forgot password?"
            android:textColor="@color/white"
            app:layout_constraintStart_toStartOf="@+id/sign_in_password"
            app:layout_constraintTop_toBottomOf="@+id/sign_in_password" />

now Define a sign in button :

<Button
            android:id="@+id/sign_in_btn"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginStart="30dp"
            android:layout_marginTop="80dp"
            android:layout_marginEnd="30dp"
            android:background="@color/CCCC00"
            android:text="Sign in"
            android:textAllCaps="false"
            android:textSize="16sp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.0"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/sign_in_password" />

Create a divider and a text View Or

Create DontHave an account TextView

<TextView
            android:id="@+id/tv_dont_have_an_account"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Dont have an account?Sign up!"
            app:layout_constraintBottom_toBottomOf="parent"
            android:textColor="@color/white"
            android:textSize="18sp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/textView2" />

‎‎‎‎‎‎‎ ‎ ‎‎‎ ‎ ‎‎ ‎ ‎ ‎ ‎‎‎ ‎ ‎‎ ‎ ‎ SignUpFragement Designing

EditText for Email id

<EditText
            android:id="@+id/sign_up_email"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginStart="20dp"
            android:layout_marginTop="20dp"
            android:layout_marginEnd="20dp"
            android:backgroundTint="#902E2929"
            android:ems="10"
            android:hint="Enter Your Email.."
            android:inputType="textEmailAddress"
            android:padding="16dp"
            android:textColor="@color/white"
            android:textColorHint="#902E2929"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.0"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/imageView_sign_up" />

EditText for Full Name

<EditText
            android:id="@+id/sign_up_full_name"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginTop="12dp"
            android:ems="10"
            android:layout_marginStart="20dp"
            android:layout_marginEnd="20dp"
            android:inputType="textPersonName"
            android:hint="Full Name.."
            android:textColor="@color/white"
            android:padding="16dp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.502"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/sign_up_email" />

EditText for password

<EditText
            android:id="@+id/sign_up_password"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginStart="16dp"
            android:layout_marginTop="68dp"
            android:layout_marginEnd="16dp"
            android:backgroundTint="#902e2929"
            android:ems="10"
            android:hint="Enter Password.."
            android:inputType="textPassword"
            android:padding="16dp"
            android:textColor="@color/white"
            android:textColorHint="#902e2929"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.0"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/sign_up_email" />

Editext for Confirm Password

<EditText
            android:id="@+id/sign_up_cnf_password"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginStart="20dp"
            android:layout_marginTop="12dp"
            android:layout_marginEnd="20dp"
            android:ems="10"
            android:hint="Confirm Password.."
            android:inputType="textPassword"
            android:padding="16dp"
            android:textColor="@color/white"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.502"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/sign_up_password" />

Button for Sign Up

<Button
            android:id="@+id/sign_up_btn"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginStart="30dp"
            android:layout_marginTop="80dp"
            android:layout_marginEnd="30dp"
            android:background="@color/CCCC00"
            android:text="Sign Up"
            android:textAllCaps="false"
            android:textSize="16sp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.0"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/sign_up_password" />

Already Have an Account TextView

<TextView
            android:id="@+id/tv_already_have_an_account"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Already have an account?Sign in!"
            android:textColor="@color/white"
            android:textSize="18sp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/textView92" />

‎‎‎‎‎‎‎ ‎ ‎‎‎ ‎ ‎‎ ‎ ‎ ‎ ‎‎‎ ‎ ‎‎ ‎ ‎ ‎‎‎‎‎‎‎ ‎ ‎‎‎ ‎ ‎‎ ‎ ‎ ‎ ‎‎‎ ‎ ‎‎ ‎ ‎ ‎‎‎‎‎‎‎ ‎ ‎‎‎ ‎ ‎‎ ‎ ‎ ‎ ‎‎‎ ‎ ‎‎ ‎ ‎ -------------------PART - II ------------------ ‎‎‎‎‎‎‎ ‎ ‎‎‎ ‎ ‎‎

PART 3

Now after degigning Fragments we will come back to activity main.xml and put Frame layout inside of Constraint layoutwith attributes as follows:

<FrameLayout
       android:layout_width="match_parent"
       android:layout_height="match_parent"
       tools:layout_editor_absoluteX="194dp"
       android:id="@+id/register_frame_layout"
       tools:layout_editor_absoluteY="306dp">

Now coming to MainActivity.java : define FrameLayout variable there :

private FrameLayout framelayout;

Now in the Oncreate Mthod , find the FrameLayout ID as:

framelayout = findViewbyId(R.id.register_frame_layout);

Now set Fragments which we created i.e. SignInFragment and SignUpFragment into MainActivity by : setFragment(); method

Create this method : and code and startFragment Transaction as follows:

private void setFragemnt(Fragment fragemnt) {
       FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
       fragmentTransaction.replace(frameLayout.getId(), fragemnt);
       fragmentTransaction.commit();
   }

Pass the SignInFragment at first because we want people to go to sign in screen at first then if he/she don't have an account then they can redirected by clicking dont have an account to SignUp Screen.

so we will redirect people to sign in screen by providing sign in fragment in setFragemnt method:

setFragement(new SignInFragment());

Now coming back to `SignInFragment.java` file:

and remove all the unnecessary lines here and final code after all the line removal will look like :

public class SigninFragment extends Fragment {

   public SigninFragment() {
       // Required empty public constructor
   }

   @Override
   public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
       super.onViewCreated(view, savedInstanceState);

     }

and we will assign dont have an account textview with a variable and find its id :

donthaveanaccount = view.findViewById(R.id.tv_dont_have_an_account);

Go to onCreate Method and change the return to View because we will retreieve id's corresponding by view method

apply the code:

View view =  inflater.inflate(R.layout.fragment_signin, container, false);
        donthaveanaccount = view.findViewById(R.id.tv_dont_have_an_account);
        return view;

Now we will create a new Method onViewCreated and call using clickListener

code as follows:

@Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        donthaveanaccount.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                setFragement(new SignUpFragment());
            }
        });
    }

pass the setFragement(); method here as shown above ↑

After Creating setFragemnt() method start FragmentTransaction there code as follows:

private void setFragement(Fragment fragement) {
        FragmentTransaction fragmentTransaction = getActivity().getSupportFragmentManager().beginTransaction();
        fragmentTransaction.replace(parentframeLayout.getId(),fragement);
        fragmentTransaction.commit();
    }

Pass frameLayout in above ↑ Method; but before that define frameLayout in SignInFragment as:

private FrameLayout frameLayout; (below public method)

Now Assign it in onCreate Method as:

frameLayout = getActivity().findViewById(R.id.register_frame_layout);

getActivity() :beause this SignInFragment is a fragement and not activity

Now coming back to setFragemnt method and pass (new SignUpFragment()) because we want user to go to SignInFragment when he/she clicks donthaveanaccount code as follows:

public SigninFragment() {
       // Required empty public constructor
   }
   private TextView donthaveanaccount;
   (Added:) private FrameLayout parentframeLayout;

@Override
   public View onCreateView(LayoutInflater inflater, ViewGroup container,
                            Bundle savedInstanceState) {
       // Inflate the layout for this fragment
       View view =  inflater.inflate(R.layout.fragment_signin, container, false);
       donthaveanaccount = view.findViewById(R.id.tv_dont_have_an_account);
       (Added:)parentframeLayout = getActivity().findViewById(R.id.register_frame_layout);
       return view;

   }

@Override
  public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
      super.onViewCreated(view, savedInstanceState);

      donthaveanaccount.setOnClickListener(new View.OnClickListener() {
          @Override
          public void onClick(View v) {
              setFragement(new SignUpFragment());
                                    ↳(Added:)
          }
      });
  }

private void setFragement(Fragment fragement) {
      FragmentTransaction fragmentTransaction = getActivity().getSupportFragmentManager().beginTransaction();
      fragmentTransaction.replace(parentframeLayout.getId(),fragement);
      fragmentTransaction.commit();
  }

Run you app and you will find no Animation :

So to create Animation :

Go to res ➜ rightclick ➜ Create New Anim Directory ➜ create 4 anim files in that directory ➜ slide_from_right, slide_from_left, slideout_from_right, slideout_from_left

Follow the attributes :

slide_from_right :

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="250"
    android:interpolator="@android:anim/accelerate_decelerate_interpolator">

    <translate android:fromXDelta="100%"
        android:fromYDelta="0%"
        android:toXDelta="0%"
        android:toYDelta="0%"/>

</set>

slide_from_left :

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="250"
    android:interpolator="@android:anim/accelerate_decelerate_interpolator">

    <translate android:fromXDelta="-100%"
        android:fromYDelta="0%"
        android:toXDelta="-100%"
        android:toYDelta="0%"/>

</set>

slideout_from_left :

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="250"
    android:interpolator="@android:anim/accelerate_decelerate_interpolator">

    <translate android:fromXDelta="100%"
        android:fromYDelta="0%"
        android:toXDelta="0%"
        android:toYDelta="-100%"/>

</set>

slideout_from_right :

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="250"
    android:interpolator="@android:anim/accelerate_decelerate_interpolator">

    <translate android:fromXDelta="0%"
        android:fromYDelta="0%"
        android:toXDelta="0%"
        android:toYDelta="100%"/>

</set>

After creating Animations lets assign it to SignInFragment and SignUpFragment :

SignInFragment: In the setFragement() method :

fragmentTransaction.setCustomAnimations(R.anim.slide_from_right, R.anim.slideout_from_left);(Add this line)

SignUpFragment: In the setFragement() method :

fragmentTransaction.setCustomAnimations(R.anim.slide_from_left, R.anim.slideout_from_right);(Add this line)

Now Overall setFragement method will look like : SignInFragment:

private void setFragement(Fragment fragement) {
        FragmentTransaction fragmentTransaction = getActivity().getSupportFragmentManager().beginTransaction();
        fragmentTransaction.replace(parentframeLayout.getId(),fragement);
        fragmentTransaction.setCustomAnimations(R.anim.slide_from_right, R.anim.slideout_from_left);
        fragmentTransaction.commit();
    }

SignUpFragment:

private void setFragemet(Fragment fragemet) {
        FragmentTransaction fragmentTransaction = getActivity().getSupportFragmentManager().beginTransaction();
        fragmentTransaction.replace(parentFrameLayout.getId(), fragemet);
        fragmentTransaction.setCustomAnimations(R.anim.slide_from_left, R.anim.slideout_from_right);
        fragmentTransaction.commit();
    }

Overall SignInFragment:

package com.aips.amit.amite_commerceapp;

import android.os.Bundle;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentTransaction;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import android.widget.TextView;

public class SigninFragment extends Fragment {

    public SigninFragment() {
        // Required empty public constructor
    }
    private TextView donthaveanaccount;
    private FrameLayout parentframeLayout;


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View view =  inflater.inflate(R.layout.fragment_signin, container, false);
        donthaveanaccount = view.findViewById(R.id.tv_dont_have_an_account);
        parentframeLayout = getActivity().findViewById(R.id.register_frame_layout);
        return view;

    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        donthaveanaccount.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                setFragement(new SignUpFragment());
            }
        });
    }

    private void setFragement(Fragment fragement) {
        FragmentTransaction fragmentTransaction = getActivity().getSupportFragmentManager().beginTransaction();
        fragmentTransaction.replace(parentframeLayout.getId(),fragement);
        fragmentTransaction.setCustomAnimations(R.anim.slide_from_right, R.anim.slideout_from_left);
        fragmentTransaction.commit();
    }
}

###Overall SignUpFragment:

package com.aips.amit.amite_commerceapp;

import android.os.Bundle;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentTransaction;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.FrameLayout;
import android.widget.ProgressBar;
import android.widget.TextView;

public class SignUpFragment extends Fragment {


    public SignUpFragment() {
        // Required empty public constructor
    }

    private TextView alreadyhaveanaccount;
    private FrameLayout parentFrameLayout;


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View view =  inflater.inflate(R.layout.fragment_sign_up, container, false);


        alreadyhaveanaccount = view.findViewById(R.id.tv_already_have_an_account);
        parentFrameLayout = getActivity().findViewById(R.id.register_frame_layout);

        return view;
    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        alreadyhaveanaccount.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                setFragemet(new SigninFragment());
            }
        });
    }

    private void setFragemet(Fragment fragemet) {
        FragmentTransaction fragmentTransaction = getActivity().getSupportFragmentManager().beginTransaction();
        fragmentTransaction.replace(parentFrameLayout.getId(), fragemet);
        fragmentTransaction.setCustomAnimations(R.anim.slide_from_left, R.anim.slideout_from_right);
        fragmentTransaction.commit();
    }
}

‎‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ -------------------PART - III ------------------ ‎ ‎ ‎ ‎‎‎ ‎ ‎‎ ‎ ‎ ‎‎‎‎‎‎‎ ‎ ‎‎‎ ‎ ‎‎ ‎ ‎ ‎ ‎‎‎ ‎ ‎‎ ‎ ‎

Part 4 : Adding Firebase to Our App in Android Studio

Go to FirebaseConsole and if hadn't signed in , first sign in to Google and then proceed with the above link

Click on add button/icon and Enter Your Project Name as in my case its eCommerce App

Now click on Continue on the next Screen as well and in the 3rd screen select Default Account for Firebase in the drop down box shown and again click on Continue

After finishing up , come to Your Android Studio and Copy the application id mentioned in the top of any of the activities which you have created

Nickname and debug id is optional , so skipping that click on Register App

Download the GoogleServices.json file , copy the json file ,now, come to android studio and from the top right corner change the directory from app to project and paste it in App folder created there.

Now come to build.gradle(Project part): add this line in dependencies:

classpath 'com.google.gms:google-services:4.3.5'

build.gradle(Module part): add this line after dependencies

apply plugin: 'com.google.gms.google-services'

Now for all the dependencies : add theselines:

dependencies {

    implementation 'androidx.appcompat:appcompat:1.0.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
    testImplementation 'junit:junit:4.+'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.0'
    implementation 'com.google.android.material:material:1.0.0'
    implementation 'com.google.firebase:firebase-core:11.8.0'
    implementation 'com.google.firebase:firebase-database:11.8.0'
    implementation 'com.google.firebase:firebase-storage:11.8.0'
    implementation 'com.google.firebase:firebase-auth:11.8.0'
    implementation 'com.google.android.material:material:1.0.0'
    implementation 'com.firebaseui:firebase-ui-database:3.2.2'
    implementation 'com.google.firebase:firebase-firestore:11.8.0'
}

Overall Build.gradle(Module Part) coding :

plugins {
    id 'com.android.application'
}

android {
    compileSdkVersion 30
    buildToolsVersion "30.0.3"

    defaultConfig {
        applicationId "com.aips.amit.amite_commerceapp"
        minSdkVersion 22
        targetSdkVersion 30
        versionCode 2021
        versionName '2021.2.19e230+cfg'

        testInstrumentationRunner 'androidx.test.runner.AndroidJUnitRunner'
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
            versionNameSuffix '2021.2.19e230+cfg'
        }
        debug {
            versionNameSuffix '2021.2.19e230+cfg'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
    flavorDimensions
}

dependencies {

    implementation 'androidx.appcompat:appcompat:1.0.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
    testImplementation 'junit:junit:4.+'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.0'
    implementation 'com.google.android.material:material:1.0.0'
    implementation 'com.google.firebase:firebase-core:11.8.0'
    implementation 'com.google.firebase:firebase-database:11.8.0'
    implementation 'com.google.firebase:firebase-storage:11.8.0'
    implementation 'com.google.firebase:firebase-auth:11.8.0'
    implementation 'com.google.android.material:material:1.0.0'
    implementation 'com.firebaseui:firebase-ui-database:3.2.2'
    implementation 'com.google.firebase:firebase-firestore:11.8.0'
}
apply plugin: 'com.google.gms.google-services'

Overall Build.gradle(Project Part) coding :

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath "com.android.tools.build:gradle:4.1.1"
        classpath 'com.google.gms:google-services:4.3.5'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ -------------------PART - IV ------------------

PART 5 : COMPLETING WITH REGISTERATION PROCESS

In this video we will verify the user entered email with emailPattern and also we will match the passwords entered in password and confirm passwordwith minumum of 8 characters field , not only that we will also see how we can register user in Firebase using firebase auth and create their account.

Step 1 : Create a new Activity (say HomeActivity.java) to send User after Successful Registration to our App.

Step 2 : Coming to SignUpFragment.java and declare below public signInFragment(){ //constructor }

    private TextView alreadyhaveanaccount;
    private FrameLayout parentFramelayout;
    private EditText signup_email;
    private EditText signup_passwrd;
    private EditText username;
    private EditText confpassword;

    private ImageButton closebtn;
    private Button signup_btn;

    private ProgressBar progressBar;

Step 3 : Assign with their Ids in onCreateView Method:

        alreadyhaveanaccount = view.findViewById(R.id.tv_already_have_an_account);

        parentFramelayout = getActivity().findViewById(R.id.register_frame_layout);

        signup_email = view.findViewById(R.id.sign_up_email);
        signup_passwrd = view.findViewById(R.id.sign_up_password);
        username = view.findViewById(R.id.sign_up_name);
        confpassword = view.findViewById(R.id.sign_up_confirm_password);

        signup_btn = view.findViewById(R.id.sign_up_btn);
        closebtn = view.findViewById(R.id.sign_up_close_btn);

        progressBar = view.findViewById(R.id.sign_up_progress_bar);

Step 4 :Now in the OnViewCreated() Method, set a OnClickListener as follows:

signup_btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //to do
            }
        });

Step 5 : Lets Disable the button because we want to confirm whether the user has inputted correct value or not !!

coming to SignUpFragment.xml file, so lets define first enabled attribute

android:enabled = "false"

android:textColor="#50ffffff"

here 50 : Transparency

Step 6 : Now coming back to SignUpFragment.java and check for userinputs are correct or not by adding a addTextChangedListener to the EditText !!

signup_email.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
                //this will be called when user hasnt inputted anything**dont need tis**
            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                checkInputs();
            }

            @Override
            public void afterTextChanged(Editable s) {
                //this will be called when user has already filled the value */*/dont need this*/
            }
        });
username.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
                //..
            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                checkInputs();
            }

            @Override
            public void afterTextChanged(Editable s) {
                //..
            }
        });
signup_passwrd.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
                //.
            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                checkInputs();
            }

            @Override
            public void afterTextChanged(Editable s) {
                //.
            }
        });
confpassword.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
                //.
            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                checkInputs();
            }

            @Override
            public void afterTextChanged(Editable s) {
                //.
            }
        });

NOTE : We dont require to give inputs or assign methods to afterTextChanged and beforeTextChanged because those two methods will remain unacessible

Step 7 : Create Method checkInputs():

private void checkInputs() {
       if(!TextUtils.isEmpty(signup_email.getText()))
       {
           if(!TextUtils.isEmpty(username.getText()))
           {
               if(!TextUtils.isEmpty(signup_passwrd.getText()) && signup_passwrd.length()>=8)
               {
                   if(!TextUtils.isEmpty(confpassword.getText()))
                   {
                       signup_btn.setEnabled(true);
                       signup_btn.setTextColor(Color.rgb(255,255,255));
                   }else{
                       signup_btn.setEnabled(false);
                       signup_btn.setTextColor(argb(50,255,255,255));
                   }
               }else
                   {
                       signup_btn.setEnabled(false);
                       signup_btn.setTextColor(argb(50,255,255,255));
               }
           }
           else{
               signup_btn.setEnabled(false);
               signup_btn.setTextColor(argb(50,255,255,255));
           }
       }
       else
           {
               signup_btn.setEnabled(false);
               signup_btn.setTextColor(argb(50,255,255,255));
       }
   }

 Now lets first define our `emailPattern` so as we can match userentered `email` with our `emailPattern`

private String emailPattern = "[a-zA-Z0-9._-]+@[a-z]+.[a-z]+";

Now coming to OnViewCreated Method:

set signup_btn -> click Listener Code :

signup_btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                checkEmailPassword();
            }
        });

Create New Method: checkEmailPassword

and check for email for matching its pattern code:

if(signup_email.getText().toString().matches(emailPattern)){

}else{

}

Now check for password confirmation: if the email is confirmed then:

if(signup_email.getText().toString().matches(emailPattern))
        {
            if(signup_passwrd.getText().toString().equals(confpassword.getText().toString()))
            {
            }else{

            }else{

            }

and if password and email pattern matches with its correspondence

then go ahead and Register or create account using firebase and making use of progress bar code:

private void checkEmailPassword() {

        if(signup_email.getText().toString().matches(emailPattern))
        {
            if(signup_passwrd.getText().toString().equals(confpassword.getText().toString()))
            {

                progressBar.setVisibility(View.VISIBLE);
                signup_btn.setEnabled(false);
                signup_btn.setTextColor(Color.argb(50,255,255,255));
                fireb.createUserWithEmailAndPassword(signup_email.getText().toString(),signup_passwrd.getText().toString()).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        if(task.isSuccessful())
                        {
                            Toast.makeText(getActivity(), "Registered Sucessful", Toast.LENGTH_SHORT).show();
                            semdUserToHomeActivity();
                        }
                        else
                        {
                            signup_btn.setEnabled(true);
                            signup_btn.setTextColor(Color.rgb(255,255,255));
                            progressBar.setVisibility(View.INVISIBLE);
                            String message = task.getException().toString();
                            Toast.makeText(getActivity(), message, Toast.LENGTH_SHORT).show();
                        }
                    }
                });
            }else{
                confpassword.setError("Password did not match");
                confpassword.requestFocus();
            }
        }else{
            signup_email.setError("Enter Valid Email..!");
            signup_email.requestFocus();
        }
}

Run the App to check Registration of User to your app

Next will be on Login

‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ -------------------PART - V ------------------

Part - 6 :

In this video we will verify the user entered email and also we will match the passwords entered in password and confirm password field , not only that we will also see how we can register user in Firebase using firebase auth and create their account.

Continuing from the 4th Video , first of all wr will define email pattern

private String emailPattern = "[a-zA-Z0-9._-]+@[a-z]+.[a-z]+";

Now coming to OnViewCreated Method:

set signup_btn -> click Listener Code :

signup_btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                checkEmailPassword();
            }
        });

Create New Method: checkEmailPassword

and check for email for matching its pattern code:

if(signup_email.getText().toString().matches(emailPattern)){

}else{

}

Now check for password confirmation: if the email is confirmed then:

if(signup_email.getText().toString().matches(emailPattern))
        {
            if(signup_passwrd.getText().toString().equals(confpassword.getText().toString()))
            {
            }else{

            }else{

            }

and if password and email pattern matches with its correspondence

then go ahead and Register or create account using firebase and making use of progress bar code:

private void checkEmailPassword() {

        if(signup_email.getText().toString().matches(emailPattern))
        {
            if(signup_passwrd.getText().toString().equals(confpassword.getText().toString()))
            {

                progressBar.setVisibility(View.VISIBLE);
                signup_btn.setEnabled(false);
                signup_btn.setTextColor(Color.argb(50,255,255,255));
                fireb.createUserWithEmailAndPassword(signup_email.getText().toString(),signup_passwrd.getText().toString()).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        if(task.isSuccessful())
                        {
                            Toast.makeText(getActivity(), "Registered Sucessful", Toast.LENGTH_SHORT).show();
                            semdUserToHomeActivity();
                        }
                        else
                        {
                            signup_btn.setEnabled(true);
                            signup_btn.setTextColor(Color.rgb(255,255,255));
                            progressBar.setVisibility(View.INVISIBLE);
                            String message = task.getException().toString();
                            Toast.makeText(getActivity(), message, Toast.LENGTH_SHORT).show();
                        }
                    }
                });
            }else{
                confpassword.setError("Password did not match");
                confpassword.requestFocus();
            }
        }else{
            signup_email.setError("Enter Valid Email..!");
            signup_email.requestFocus();
        }
}

Run the App to get result

See you on Login Screen

Part 7 : Setting Up the `LoginFragment.java` using `FirebaseAuth`

Part 1: Let's start with assigning the EditText, Sign in Button, ProgressBar and Close Button values in SignInFragment.java

private EditText email, password;
private Button signin_btn;
private TextView forpass;
private ProgressBar progressBar;
private ImageButton close_btn;

Part 2: Lets Assign it by its Id's:

email = view.findViewById(R.id.sign_in_email);

        password = view.findViewById(R.id.sign_in_password);

        forpass = view.findViewById(R.id.sign_in_forgot_password);

        progressBar = view.findViewById(R.id.signin_progress_bar);

        signin_btn = view.findViewById(R.id.sign_in_btn);

        close_btn = view.findViewById(R.id.sign_in_close_btn);

Part 3 : We will check whether the user has entered email or not and also matching with its pattern or not.

Set a TextChanged Listener on user entered email:

email.addTextChangedListener(new TextWatcher() { @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) { } @Override public void onTextChanged(CharSequence s, int start, int before, int count) { checkInput();// Create this method } @Override public void afterTextChanged(Editable s) { } });

and set a addTextChangedListener on password as well:

password.addTextChangedListener(new TextWatcher() { @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) { } @Override public void onTextChanged(CharSequence s, int start, int before, int count) { checkInput(); // Same Method as defined in email } @Override public void afterTextChanged(Editable s) { } });

Part 4 : We will create above Method i.e. checkInput() in SignInFragment.java

private void checkInput() {
        if(!TextUtils.isEmpty(email.getText()))
        {
            if(!TextUtils.isEmpty(password.getText()))
            {
                signin_btn.setEnabled(true);
                signin_btn.setTextColor(Color.rgb(255,255,255));
            }else{
                signin_btn.setEnabled(false);
                signin_btn.setTextColor(Color.argb(50,255,255,255));
            }
        }else{
            signin_btn.setEnabled(false);
            signin_btn.setTextColor(Color.argb(50,255,255,255));
        }
    }

Part 5 : Now set a ClickListener on signin button in onViewCreated Method

signin_btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                checkEmailandPassword();
            }
        });

Create Method checkEmailandPassword() but before that declare FirebaseAuth in SignInFragment.java so as to sign in user using Firebase

private FirebaseAuthfireb;

In the onCreateView Method declare :

fireb = FirebaseAuth.getInstance();

Part 6 : Create Method checkEmailandPassword() in SignInFragment.java and SignIn using Firebase as :

private void checkEmailandPassword() {
        if(email.getText().toString().matches(emailPattern))
        {
            if(password.length()>=8)
            {

                progressBar.setVisibility(View.VISIBLE);
                signin_btn.setEnabled(false);
                signin_btn.setTextColor(Color.argb(50,255,255,255));
                fireb.signInWithEmailAndPassword(email.getText().toString(), password.getText().toString()).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        if(task.isSuccessful())
                        {
                            Toast.makeText(getActivity(), "Sign In Succesful", Toast.LENGTH_SHORT).show();
                            sendUserToHOMEaCTIVITY();
                        }else{
                            progressBar.setVisibility(View.INVISIBLE);
                            signin_btn.setEnabled(true);
                            signin_btn.setTextColor(Color.rgb(255,255,255));
                            String message = task.getException().toString();
                            Toast.makeText(getActivity(), "Error"+message, Toast.LENGTH_SHORT).show();
                        }
                    }
                });
        }else{
                password.setError("Password length is less than 8");
                password.requestFocus();
        }
        }else{
            email.setError("Enter Valid email ");
            email.requestFocus();
        }
    }

Overall SignInFragment.java:

package com.aips.amit.amite_commerceapp;

import android.content.Intent;
import android.graphics.Color;
import android.media.Image;
import android.os.Bundle;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentTransaction;

import android.text.Editable;
import android.text.TextUtils;
import android.text.TextWatcher;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.FrameLayout;
import android.widget.ImageButton;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;

import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;

public class SigninFragment extends Fragment {

    public SigninFragment() {
    }

    private TextView donthaveanaccount;
    private FrameLayout parentframeLayout;

    private EditText email;
    private EditText password;

    private TextView forpass;

    private ProgressBar progressBar;

    private Button signin_btn;

    private ImageButton close_btn;

    private FirebaseAuth fireb;
    private FirebaseUser firebaseUser;
    private String emailPattern = "[a-zA-Z0-9._-]+@[a-z]+.[a-z]+";

    @Override
    public void onStart() {
        super.onStart();
        if(firebaseUser ==null)
        {
            //
        }
        else{
            sendUserToHOMEaCTIVITY();
            Toast.makeText(getActivity(), "Welcome sir/mam", Toast.LENGTH_SHORT).show();
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View view =inflater.inflate(R.layout.fragment_signin, container, false);
        donthaveanaccount = view.findViewById(R.id.tv_dont_have_an_account);
        parentframeLayout = getActivity().findViewById(R.id.register_frame_layout);

        email = view.findViewById(R.id.sign_in_email);

        password = view.findViewById(R.id.sign_in_password);

        forpass = view.findViewById(R.id.sign_in_forgot_password);

        progressBar = view.findViewById(R.id.signin_progress_bar);

        signin_btn = view.findViewById(R.id.sign_in_btn);

        close_btn = view.findViewById(R.id.sign_in_close_btn);

        fireb = FirebaseAuth.getInstance();

        firebaseUser = fireb.getCurrentUser();

        return view;

    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        donthaveanaccount.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                setFragment(new SignUpFragment());
            }
        });

        email.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {

            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                checkInput();
            }

            @Override
            public void afterTextChanged(Editable s) {

            }
        });
        password.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {

            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                checkInput();
            }

            @Override
            public void afterTextChanged(Editable s) {

            }
        });

        signin_btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                checkEmailandPassword();
            }
        });

        forpass.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                sendUserToForgetPassFragment(new forget_password());
            }
        });
    }

    private void sendUserToForgetPassFragment(forget_password forget_password) {
        FragmentTransaction fragmentTransaction = getActivity().getSupportFragmentManager().beginTransaction();
        fragmentTransaction.setCustomAnimations(R.anim.slide_from_right, R.anim.slideout_from_left);
        fragmentTransaction.replace(parentframeLayout.getId(),forget_password);
        fragmentTransaction.commit();
    }

    private void checkEmailandPassword() {
        if(email.getText().toString().matches(emailPattern))
        {
            if(password.length()>=8)
            {

                progressBar.setVisibility(View.VISIBLE);
                signin_btn.setEnabled(false);
                signin_btn.setTextColor(Color.argb(50,255,255,255));
                fireb.signInWithEmailAndPassword(email.getText().toString(), password.getText().toString()).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        if(task.isSuccessful())
                        {
                            Toast.makeText(getActivity(), "Sign In Succesful", Toast.LENGTH_SHORT).show();
                            sendUserToHOMEaCTIVITY();
                        }else{
                            progressBar.setVisibility(View.INVISIBLE);
                            signin_btn.setEnabled(true);
                            signin_btn.setTextColor(Color.rgb(255,255,255));
                            String message = task.getException().toString();
                            Toast.makeText(getActivity(), "Error"+message, Toast.LENGTH_SHORT).show();
                        }
                    }
                });
        }else{
                password.setError("Password length is less than 8");
                password.requestFocus();
        }
        }else{
            email.setError("Enter Valid email ");
            email.requestFocus();
        }
    }

    private void sendUserToHOMEaCTIVITY() {
        Intent i = new Intent(getActivity(),HomeActivity.class);
        startActivity(i);
        getActivity().finish();
    }

    private void checkInput() {
        if(!TextUtils.isEmpty(email.getText()))
        {
            if(!TextUtils.isEmpty(password.getText()))
            {
                signin_btn.setEnabled(true);
                signin_btn.setTextColor(Color.rgb(255,255,255));
            }else{
                signin_btn.setEnabled(false);
                signin_btn.setTextColor(Color.argb(50,255,255,255));
            }
        }else{
            signin_btn.setEnabled(false);
            signin_btn.setTextColor(Color.argb(50,255,255,255));
        }
    }

    private void setFragment(Fragment fragment) {
        FragmentTransaction fragmentTransaction = getActivity().getSupportFragmentManager().beginTransaction();
        fragmentTransaction.setCustomAnimations(R.anim.slide_from_right, R.anim.slideout_from_left);
        fragmentTransaction.replace(parentframeLayout.getId(),fragment);
        fragmentTransaction.commit();
    }
}

Overall SignInFragment.xml:

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/Orange"
    tools:context=".SigninFragment">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <ImageButton
            android:id="@+id/sign_in_close_btn"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="@android:color/transparent"
            android:padding="16dp"
            android:src="@drawable/ic_baseline_clear_24"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="1.0"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />

        <ImageView
            android:id="@+id/imageView"
            android:layout_width="120dp"
            android:layout_height="120dp"
            android:layout_marginTop="4dp"
            android:src="@drawable/carts"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.498"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/sign_in_close_btn" />

        <EditText
            android:id="@+id/sign_in_email"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginStart="16dp"
            android:layout_marginTop="8dp"
            android:layout_marginEnd="16dp"
            android:backgroundTint="#70ffffff"
            android:ems="10"
            android:hint="Enter Your Email.."
            android:inputType="textEmailAddress"
            android:textColor="@color/white"
            android:padding="16dp"
            android:textColorHint="#70ffffff"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/imageView" />

        <EditText
            android:id="@+id/sign_in_password"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginStart="16dp"
            android:layout_marginTop="8dp"
            android:layout_marginEnd="16dp"
            android:backgroundTint="#70ffffff"
            android:ems="10"
            android:textColor="@color/white"
            android:hint="Enter Your Password.."
            android:inputType="numberPassword"
            android:padding="16dp"
            android:textColorHint="#70ffffff"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/sign_in_email" />

        <TextView
            android:id="@+id/sign_in_forgot_password"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="8dp"
            android:layout_marginTop="8dp"
            android:text="Forgot Password?"
            android:textColor="@color/white"
            app:layout_constraintStart_toStartOf="@+id/sign_in_password"
            app:layout_constraintTop_toBottomOf="@+id/sign_in_password" />

        <Button
            android:id="@+id/sign_in_btn"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginStart="50dp"
            android:layout_marginTop="24dp"
            android:layout_marginEnd="50dp"
            android:text="Sign in"
            android:enabled="false"
            android:textSize="16sp"
            android:backgroundTint="#FFA500"
            android:textColor="#50ffffff"
            android:textAllCaps="false"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/sign_in_password" />

        <TextView
            android:id="@+id/textView2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="or"
            android:textColor="@color/white"
            app:layout_constraintBottom_toTopOf="@+id/tv_dont_have_an_account"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/sign_in_btn" />

        <TextView
            android:id="@+id/tv_dont_have_an_account"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="24dp"
            android:text="Don't have an account?Sign up!"
            android:textColor="@color/white"
            android:textSize="20dp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent" />

        <View
            android:id="@+id/divider"
            android:layout_width="100dp"
            android:layout_height="1dp"
            android:layout_marginStart="67dp"
            android:layout_marginTop="29dp"
            android:layout_marginEnd="224dp"
            android:layout_marginBottom="26dp"
            android:background="@color/white"
            app:layout_constraintBottom_toTopOf="@+id/tv_dont_have_an_account"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/sign_in_btn" />

        <View
            android:layout_width="100dp"
            android:layout_height="1dp"
            android:layout_marginStart="224dp"
            android:layout_marginTop="29dp"
            android:layout_marginEnd="67dp"
            android:layout_marginBottom="26dp"
            android:background="@color/white"
            app:layout_constraintBottom_toTopOf="@+id/tv_dont_have_an_account"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/sign_in_btn" />

        <ProgressBar
            android:id="@+id/signin_progress_bar"
            style="?android:attr/progressBarStyle"
            android:layout_width="30dp"
            android:layout_height="30dp"
            android:visibility="invisible"
            app:layout_constraintBottom_toTopOf="@+id/sign_in_btn"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/sign_in_password" />

    </androidx.constraintlayout.widget.ConstraintLayout>

</FrameLayout>

Part 8 : Sending user password reset mail using FirebaseAuth

Xml Include:

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/white"
    tools:context=".forget_password">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginStart="5dp"
        android:layout_marginEnd="5dp"
        android:layout_marginBottom="5dp"
        android:layout_marginTop="5dp"
        android:background="@color/white">


        <ImageView
            android:id="@+id/imageView2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="16dp"
            android:layout_marginTop="16dp"
            android:layout_marginBottom="3dp"
            android:src="@drawable/forgot_password"
            app:layout_constraintBottom_toTopOf="@+id/textView3"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="16dp"
            android:fontFamily="@font/ubuntu"
            android:text="Forgot Password?"
            android:textColor="#626262"
            android:textSize="24sp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />

        <TextView
            android:id="@+id/textView3"
            android:layout_width="366dp"
            android:layout_height="56dp"
            android:layout_marginBottom="20dp"
            android:fontFamily="@font/ubuntu"
            android:text="Enter the Email Adress Associated with your Account.."
            android:textSize="24sp"
            app:layout_constraintBottom_toTopOf="@+id/forget_email"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/imageView2" />

        <EditText
            android:id="@+id/forget_email"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginStart="30dp"
            android:layout_marginTop="20dp"
            android:layout_marginEnd="30dp"
            android:layout_marginBottom="2dp"
            android:backgroundTint="@color/Orange"
            android:ems="10"
            android:fontFamily="@font/ubuntu"
            android:hint="Enter Your Email.."
            android:inputType="textEmailAddress"
            android:textColor="@color/Orange"
            android:textColorHint="@color/Orange"
            android:theme="@style/RedProgressbar"
            app:layout_constraintBottom_toTopOf="@+id/linearLayout"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/textView3" />

        <Button
            android:id="@+id/forget_password_button"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginStart="50dp"
            android:layout_marginEnd="50dp"
            android:background="@color/Orange"
            android:enabled="false"
            android:fontFamily="@font/ubuntu"
            android:text="Send Password Confirmation"
            android:textAllCaps="false"
            android:textColor="#50ffffff"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.0"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/forget_email"
            app:layout_constraintVertical_bias="0.388" />

        <TextView
            android:id="@+id/mail_sender"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="50dp"
            android:layout_marginTop="44dp"
            android:layout_marginEnd="50dp"
            android:layout_marginBottom="17dp"
            android:fontFamily="@font/ubuntu"
            android:text="Check Your email for reset password link"
            android:textColor="#626262"
            android:textSize="18sp"
            app:layout_constraintBottom_toTopOf="@+id/signin_back"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/forget_password_button" />

        <TextView
            android:id="@+id/signin_back"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="104dp"
            android:layout_marginTop="16dp"
            android:layout_marginEnd="138dp"
            android:layout_marginBottom="25dp"
            android:fontFamily="@font/ubuntu"
            android:text="&lt;&lt; Go to Login!"
            android:textSize="24sp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/mail_sender"
            app:layout_constraintVertical_bias="1.0" />

        <LinearLayout
            android:id="@+id/linearLayout"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="16dp"
            android:layout_marginTop="20dp"
            android:layout_marginEnd="16dp"
            android:layout_marginBottom="30dp"
            android:orientation="horizontal"
            app:layout_constraintBottom_toTopOf="@+id/forget_password_button"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/forget_email">

            <ImageView
                android:id="@+id/email_icon"
                android:layout_width="wrap_content"
                android:layout_height="15dp"
                android:layout_gravity="center"
                android:background="@android:color/transparent"
                android:src="@drawable/ic_baseline_mail_outline_24"
                tools:visibility="gone" />

            <TextView
                android:id="@+id/check_confirmation"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="5dp"
                android:text="Recovery Email Sent Succesfully! Check your Inbox"
                android:textColor="#11A10C"
                tools:visibility="gone" />

        </LinearLayout>

        <ProgressBar
            android:id="@+id/progress_bar_forget_password_screen"
            style="?android:attr/progressBarStyleHorizontal"
            android:layout_width="100dp"
            android:layout_height="wrap_content"
            android:layout_marginBottom="4dp"
            android:visibility="gone"
            android:indeterminate="true"
            android:theme="@style/RedProgressbar"
            app:layout_constraintBottom_toTopOf="@+id/forget_password_button"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/linearLayout"
            tools:visibility="invisible" />
    </androidx.constraintlayout.widget.ConstraintLayout>

</FrameLayout>

Now coming back to Fragment Forget Password.java file :

First of all initialize the email id and button on which user will click for email to send confirmation Link : in onCreateView method:

private EditText email;

private Button forget_buttin;

Initialize both of them in onViewCreated method :

email = view.findViewById(R.id.forget_email);

forget_buttin = view.findViewById(R.id.forget_password_button);

Now validate emailby adding addTextChangedListener on it:

email.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {

            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                checkCorrection();
            }

            @Override
            public void afterTextChanged(Editable s) {

            }
        });

Create Method checkCorrection():

private void checkCorrection()   {
    if(!(TextUtils.isEmpty(email.getText())))
    {
        forget_buttin.setEnabled(true);
        forget_buttin.setTextColor(Color.rgb(255,255,255));
    }else{
        forget_buttin.setEnabled(false);
        forget_buttin.setTextColor(Color.argb(50,255,255,255));
    }
}

Now add ClickListener on button:

forget_buttin.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {

        TransitionManager.beginDelayedTransition(linearLayout_container);
        emailIcon.setVisibility(View.GONE);

        TransitionManager.beginDelayedTransition(linearLayout_container);
        emailIcon.setVisibility(View.VISIBLE);
        horizprog_bar.setVisibility(View.VISIBLE);


        forget_buttin.setEnabled(false);
        forget_buttin.setTextColor(Color.argb(50,255,255,255));
        fireb.sendPasswordResetEmail(email.getText().toString()).addOnCompleteListener(new OnCompleteListener<Void>() {
                    @Override
                    public void onComplete(@NonNull Task<Void> task) {
                        if(task.isSuccessful())
                        {
                            forget_buttin.setEnabled(false);
                            Toast.makeText(getActivity(), "Email sent sucesfully", Toast.LENGTH_LONG).show();
                        }else{
                            Toast.makeText(getActivity(), task.getException().getMessage(), Toast.LENGTH_SHORT).show();
                            horizprog_bar.setVisibility(View.GONE);
                            mailcheck_text.setText(task.getException().getMessage());
                            mailcheck_text.setTextColor(getResources().getColor(R.color.red));
                            TransitionManager.beginDelayedTransition(linearLayout_container);
                            mailcheck_text.setVisibility(View.VISIBLE);
                        }

                    }
                });
    }
});

set a ClickListener on Go back button as well :

gob.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        sendUserToLoginFragment(new SigninFragment());
    }
});

Create method sendUserToLoginFragment():

private void sendUserToLoginFragment(Fragment fragment) {
    FragmentTransaction fragmentTransaction = getActivity().getSupportFragmentManager().beginTransaction();
    fragmentTransaction.replace(parentframeLayout.getId(),fragment);
    fragmentTransaction.commit();
}

Part 9: Fixing Up the errors, setting up the icons, & fixing up the screenOrientation issue

Step 1: Setting up the icon

Go to Mainfest.xml and loook for icon in the 5th or 6th line of the code :

android:icon="@drawable/carts"
android:roundIcon="@drawable/carts"

Step 2 : Restricting the user to stay in Potrait Mode:

android:screenOrientation="portrait" Declare this line after each activity defined

Step 3 : Configuring the back Button:

1.) Coming to MainActivity.java and create a new Method:

@Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK) {
            if (checkforForgetpasswordFragments) {
            }
            setFragemet(new SigninFragment());
            return false;
        }
        return super.onKeyDown(keyCode, event);
    }

Coming to SignUpFragmemnt.java
Copy the lines

private void setFragemet(Fragment fragemet) {
        FragmentTransaction fragmentTransaction = getActivity().getSupportFragmentManager().beginTransaction();
        fragmentTransaction.replace(parentFrameLayout.getId(), fragemet);
        fragmentTransaction.setCustomAnimations(R.anim.slide_from_left, R.anim.slideout_from_right);
        fragmentTransaction.commit();
    }

Define the already present setFragement() method as setParentFragement()

Coming to SigninFragment.java: inside forgetPassword click listener:

checkforForgetpasswordFragments = true;

kdrag0nx/eCommerce-Android-Studio-App