D-Chat is an Android chatting app based on Firebase. Therefore it is lightweight, simple, but yet powerful, fast and reliable for simple tasks.
Registration is done with this registration page.
| User is promted to insert info needed for registration | Example of inserted data |
|---|---|
 |
 |
On registration button pressed the entered data is examined and checked for illegal symbols. Email syntax is checked.
| Fields cannot be blank | Email must contain '@' and '.', and not contain other symbols |
|---|---|
 |
 |
If the data is valid, the user is registered, and the user is taken to the Main Activity:
private void Register(String name, String email, String password) {
progressBar.setVisibility(View.VISIBLE); // Indicate that the registration process started
// Create new User with email and password
fAuth.createUserWithEmailAndPassword(email, password).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull @NotNull Task<AuthResult> task) {
if(task.isSuccessful())
{
FirebaseUser currentUser = fAuth.getCurrentUser();
assert currentUser != null;
String userID = currentUser.getUid();
// Current users new collection of data under his UID
DatabaseReference users = database.getReference("Users");
// Create hashmap with user's data
HashMap<String, String> userinfo = new HashMap<>();
userinfo.put("id", userID);
userinfo.put("username", name);
userinfo.put("email", email);
userinfo.put("imageURL", "default");
userinfo.put("status", "offline");
// Upload the data to the database and set a listener
users.child(userID).setValue(userinfo).addOnCompleteListener(new OnCompleteListener<Void>() {
@Override
public void onComplete(@NonNull @NotNull Task<Void> task) {
if(task.isSuccessful()){
// If successful - move to main activity
Intent main = new Intent(getApplicationContext(), MainActivity.class);
main.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(main);
// Toast welcome message
Toast.makeText(getApplicationContext(), "User Created. Welcome!", Toast.LENGTH_SHORT).show();
finish();
} else {
// Log error message
Log.d(TAG, task.getException().getMessage());
progressBar.setVisibility(View.GONE);
}
}
});
}
else {
// Toast error message
Toast.makeText(getApplicationContext(), "Error! " + Objects.requireNonNull(task.getException()).getMessage(), Toast.LENGTH_SHORT).show();
progressBar.setVisibility(View.GONE);
}
}
});
}If a user already has an account, he can move to the login page by clicking the textview under registration button.
Here the user is promted to enter his email and password. On login button press the entered data is checked and if is valid, the user is logged in:
loginButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String email = Objects.requireNonNull(emailET.getText()).toString();
String password = Objects.requireNonNull(passwordET.getText()).toString();
progressBar.setVisibility(View.VISIBLE);
if(data_ok(email, password)){ // data was ok -- proceed with signing in
fAuth.signInWithEmailAndPassword(email, password).addOnSuccessListener(new OnSuccessListener<AuthResult>() {
@Override
public void onSuccess(AuthResult authResult) {
progressBar.setVisibility(View.GONE);
Toast.makeText(getApplicationContext(), "Logged in successfully", Toast.LENGTH_SHORT).show();
// Display debug info
Log.d(TAG, "LoginSuccess: Logged in user " + Objects.requireNonNull(fAuth.getCurrentUser()).getUid());
Intent main = new Intent(getApplicationContext(), MainActivity.class);
main.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(main);
finish();
}
}).addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull @NotNull Exception e) {
progressBar.setVisibility(View.INVISIBLE);
Toast.makeText(getApplicationContext(), "Login failed! " + e.getMessage(), Toast.LENGTH_SHORT).show();
Log.d(TAG,"LoginFailure: " + e.toString());
}
});
} else { // data was not ok
progressBar.setVisibility(View.INVISIBLE);
return;
}
}
});If the user has forgot his password he can reset it by clicking the "Forgot your password?" textview. A new activity is started where the user is promted to enter his account's login info.
An email is sent to the entered address with reset link.
After clicking the link a new page is opened with password reset window:
The entered new password then is saved and applied.
The main activity is a tab layout with 2 fragments - Chats Fragment and Users Fragment and with a 3 dot menu where the user can open his profile or logout.
On the 3 dot menu item click the profile activity is started, where the user can see his account info (public name and e-mail), and also his profile picture. Profile picture can be changed by clicking on it. The user will be promted to choose an image from his files and then the selected image will be uploaded to Firebase Storage, and the user's profile picture will be visible for all the D-Chat users.
| Profile with default profile picture | Profile after posting custom profile picture |
|---|---|
 |
 |
Here you can see a list of all users of D-Chat. And by clicking on them you can start a new chat with the selected user.
Here the user can also search for users:
Here are listed all the chats of the user. When user starts a new chat - a new item with receiver user is added to the list. By clicking on that item you can open the chat with that user.
The chat item includes the receiver's name, profile picture, activity status and the last message of the chat. If the last message is not seen yet, it is showing in bold style.
When a chat item clicked a message activity starts featuring sender and receiver users.
| The last message is delivered but not seen yet | The last message is seen |
|---|---|
 |
 |
On send button click the entered message is checked if it is empty or if it is longer than maximum allowed message size (150 characters by default. Is regulated by MAX_MESSAGE_SIZE parameter, can be changed)
If everything is okay, the message is sent.
Message Structure :
A message contains several fields describing it:
- the status field
- receiver id
- sender id
- and the message itself (the messages are not being encrypted yet, but will be in the future). After the message is seen, the "isseen" field turns "true"
To use the app you will have to get google-services.json file which is generated by Google when adding an app to Firebase. Download the file and put it in the "app" folder
Author: Davit Mutafyan