yelifujiamian/easypermissions

Simplify Android M system permissions

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 {
    compile 'pub.devrel:easypermissions:0.4.2'
}

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, any methods annotated with the proper request code will be executed. 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);
    }
}

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:

@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();
    }
}