Android 6.0 Marshmallow permission handling

For Android version 6.0 Marshmallow or above, some dangerous permissions such as reading phone state and location need to be granted by the user at run time instead of granting them when installing it from the play store.

The following example demonstrates how to ask the user for the required permissions the app needs at run time. In this case, it’s asking for the READ_PHONE_STATE and ACCESS_FINE_LOCATION permissions.

To check if a permission is already granted.

if (ContextCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.READ_PHONE_STATE) != PackageManager.PERMISSION_GRANTED)

To check if the user has denied the permission and don’t want to be asked to grant the permission again.

boolean showRationale = ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.READ_PHONE_STATE);

To ask for permission at run time.

String PERMISSIONS_REQUIRED[] = new String[]{
            Manifest.permission.READ_PHONE_STATE,
            Manifest.permission.ACCESS_FINE_LOCATION
    };                   

ActivityCompat.requestPermissions(mActivity, PERMISSIONS_REQUIRED, REQUEST_PERMISSIONS);

In support fragment, the above two can be called like these:

boolean showRationale = shouldShowRequestPermissionRationale(Manifest.permission.READ_PHONE_STATE);
requestPermissions(new String[]{Manifest.permission.READ_PHONE_STATE}, 100);

This onRequestPermissionsResult need to be implemented in the Activity class to receive the response from the user from the requestPermissions

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    Log.d("MainActivity", "requestCode: " + requestCode);
    Log.d("MainActivity", "Permissions:" + Arrays.toString(permissions));
    Log.d("MainActivity", "grantResults: " + Arrays.toString(grantResults));
    //do something to handle the results
}

<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

The Activity class demonstrating the handling of permissions.

public class MainActivity extends AppCompatActivity {

    private MainActivity mActivity;
    private static final int REQUEST_PERMISSIONS = 100;
    private static final String PERMISSIONS_REQUIRED[] = new String[]{
            Manifest.permission.READ_PHONE_STATE,
            Manifest.permission.ACCESS_FINE_LOCATION
    };

    private boolean checkPermission(String permissions[]) {
        for (String permission : permissions) {
            if (ContextCompat.checkSelfPermission(getApplicationContext(), permission) != PackageManager.PERMISSION_GRANTED) {
                return false;
            }
        }
        return true;
    }
    private void checkPermissions() {
        boolean permissionsGranted = checkPermission(PERMISSIONS_REQUIRED);
        if (permissionsGranted) {
            Toast.makeText(this, "You've granted all required permissions!", Toast.LENGTH_SHORT).show();
        } else {
            boolean showRationale = true;
            for (String permission: PERMISSIONS_REQUIRED) {
                showRationale = ActivityCompat.shouldShowRequestPermissionRationale(this, permission);
                if (!showRationale) {
                    break;
                }
            }

            String dialogMsg = showRationale ? "We need some permissions to run this APP!" : "You've declined the required permissions, please grant them from your phone settings";

            new AlertDialog.Builder(this)
                    .setTitle("Permissions Required")
                    .setMessage(dialogMsg)
                    .setCancelable(false)
                    .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            ActivityCompat.requestPermissions(mActivity, PERMISSIONS_REQUIRED, REQUEST_PERMISSIONS);
                        }
                    }).create().show();
        }
    }


    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        Log.d("MainActivity", "requestCode: " + requestCode);
        Log.d("MainActivity", "Permissions:" + Arrays.toString(permissions));
        Log.d("MainActivity", "grantResults: " + Arrays.toString(grantResults));

        if (requestCode == REQUEST_PERMISSIONS) {
            boolean hasGrantedPermissions = true;
            for (int i=0; i<grantResults.length; i++) {
                if (grantResults[i] != PackageManager.PERMISSION_GRANTED) {
                    hasGrantedPermissions = false;
                    break;
                }
            }

            if (!hasGrantedPermissions) {
                finish();
            }

        } else {
            finish();
        }
    }


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mActivity = this;

        checkPermissions();



        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
    }

}

Complete example in Github