EasyPermissions

EasyPermissions is a wrapper library to simplify basic system permissions logic when targeting Android M or higher.

Installation

EasyPermissions is installed by adding the following dependency to your build.gradle file:

dependencies {
    implementation 'pub.devrel:easypermissions:1.2.0'
}

Note that EasyPermissions depends on Android Support Library 27.1.0 so you will need to use compileSdkVersion 27 or higher. This change should be safe as compileSdkVersion does not change app behavior.

Usage

Basic

To begin using EasyPermissions, have your Activity (or Fragment) override the onRequestPermissionsResult method:

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);

        // Forward results to EasyPermissions
        EasyPermissions.onRequestPermissionsResult(requestCode, permissions, grantResults, this);
    }
}

Request Permissions

The example below shows how to request permissions for a method that requires both CAMERA and ACCESS_FINE_LOCATION permissions. There are a few things to note:

Using EasyPermissions#hasPermissions(...) to check if the app already has the required permissions. This method can take any number of permissions as its final argument.
Requesting permissions with EasyPermissions#requestPermissions. This method will request the system permissions and show the rationale string provided if necessary. The request code provided should be unique to this request, and the method can take any number of permissions as its final argument.
Use of the AfterPermissionGranted annotation. This is optional, but provided for convenience. If all of the permissions in a given request are granted, all methods annotated with the proper request code will be executed(be sure to have an unique request code). The annotated method needs to be void and without input parameters (instead, you can use onSaveInstanceState in order to keep the state of your suppressed parameters). This is to simplify the common flow of needing to run the requesting method after all of its permissions have been granted. This can also be achieved by adding logic on the onPermissionsGranted callback.

@AfterPermissionGranted(RC_CAMERA_AND_LOCATION)
private void methodRequiresTwoPermission() {
    String[] perms = {Manifest.permission.CAMERA, Manifest.permission.ACCESS_FINE_LOCATION};
    if (EasyPermissions.hasPermissions(this, perms)) {
        // Already have permission, do the thing
        // ...
    } else {
        // Do not have permissions, request them now
        EasyPermissions.requestPermissions(this, getString(R.string.camera_and_location_rationale),
                RC_CAMERA_AND_LOCATION, perms);
    }
}

Or for finer control over the rationale dialog, use a PermissionRequest:

EasyPermissions.requestPermissions(
        new PermissionRequest.Builder(this, RC_CAMERA_AND_LOCATION, perms)
                .setRationale(R.string.camera_and_location_rationale)
                .setPositiveButtonText(R.string.rationale_ask_ok)
                .setNegativeButtonText(R.string.rationale_ask_cancel)
                .setTheme(R.style.my_fancy_style)
                .build());

Optionally, for a finer control, you can have your Activity / Fragment implement the PermissionCallbacks interface.

public class MainActivity extends AppCompatActivity implements EasyPermissions.PermissionCallbacks {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);

        // Forward results to EasyPermissions
        EasyPermissions.onRequestPermissionsResult(requestCode, permissions, grantResults, this);
    }

    @Override
    public void onPermissionsGranted(int requestCode, List<String> list) {
        // Some permissions have been granted
        // ...
    }

    @Override
    public void onPermissionsDenied(int requestCode, List<String> list) {
        // Some permissions have been denied
        // ...
    }
}

Required Permissions

In some cases your app will not function properly without certain permissions. If the user denies these permissions with the "Never Ask Again" option, you will be unable to request these permissions from the user and they must be changed in app settings. You can use the method EasyPermissions.somePermissionPermanentlyDenied(...) to display a dialog to the user in this situation and direct them to the system setting screen for your app:

Note: Due to a limitation in the information provided by the Android framework permissions API, the somePermissionPermanentlyDenied method only works after the permission has been denied and your app has received the onPermissionsDenied callback. Otherwise the library cannot distinguish permanent denial from the "not yet denied" case.

@Override
public void onPermissionsDenied(int requestCode, List<String> perms) {
    Log.d(TAG, "onPermissionsDenied:" + requestCode + ":" + perms.size());

    // (Optional) Check whether the user denied any permissions and checked "NEVER ASK AGAIN."
    // This will display a dialog directing them to enable the permission in app settings.
    if (EasyPermissions.somePermissionPermanentlyDenied(this, perms)) {
        new AppSettingsDialog.Builder(this).build().show();
    }
}

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == AppSettingsDialog.DEFAULT_SETTINGS_REQ_CODE) {
        // Do something after user returned from app settings screen, like showing a Toast.
        Toast.makeText(this, R.string.returned_from_app_settings_to_activity, Toast.LENGTH_SHORT)
                .show();
    }
}

Interacting with the rationale dialog

Implement the EasyPermissions.RationaleCallbacks if you want to interact with the rationale dialog.

@Override
public void onRationaleAccepted(int requestCode) {
    // Rationale accpets to request some permissions
    // ...
}

@Override
public void onRationaleDenied(int requestCode) {
    // Rationale denied to request some permissions
    // ...
}

Rationale callbacks don't necessarily imply permission changes. To check for those, see the EasyPermissions.PermissionCallbacks.

LICENSE

	Copyright 2017 Google

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

     http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.

yilinglou/easypermissions