PermissionsDispatcher

PermissionsDispatcher provides a simple annotation-based API to handle runtime permissions in Android Marshmallow, 100% reflection-free.

This library lifts the burden that comes with writing a bunch of check statements whether a permission has been granted or not from you, in order to keep your code clean and safe.

Usage

Here's a minimum example, in which we register a MainActivity which requires Manifest.permission.CAMERA.

0. Prepare AndroidManifest

Add the following line to AndroidManifest.xml:

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

1. Attach annotations

PermissionsDispatcher introduces only a few annotations, keeping its general API concise:

NOTE: Annotated methods must not be private.

Annotation	Required	Description
`@RuntimePermissions`	✓	Register an `Activity` or `Fragment`(we support both) to handle permissions
`@NeedsPermission`	✓	Annotate a method which performs the action that requires one or more permissions
`@OnShowRationale`		Annotate a method which explains why the permission/s is/are needed. It passes in a `PermissionRequest` object which can be used to continue or abort the current permission request upon user input
`@OnPermissionDenied`		Annotate a method which is invoked if the user doesn't grant the permissions
`@OnNeverAskAgain`		Annotate a method which is invoked if the user chose to have the device "never ask again" about a permission

@RuntimePermissions
public class MainActivity extends AppCompatActivity {

    @NeedsPermission(Manifest.permission.CAMERA)
    void showCamera() {
        getSupportFragmentManager().beginTransaction()
                .replace(R.id.sample_content_fragment, CameraPreviewFragment.newInstance())
                .addToBackStack("camera")
                .commitAllowingStateLoss();
    }

    @OnShowRationale(Manifest.permission.CAMERA)
    void showRationaleForCamera(final PermissionRequest request) {
        new AlertDialog.Builder(this)
            .setMessage(R.string.permission_camera_rationale)
            .setPositiveButton(R.string.button_allow, (dialog, button) -> request.proceed())
            .setNegativeButton(R.string.button_deny, (dialog, button) -> request.cancel())
            .show();
    }

    @OnPermissionDenied(Manifest.permission.CAMERA)
    void showDeniedForCamera() {
        Toast.makeText(this, R.string.permission_camera_denied, Toast.LENGTH_SHORT).show();
    }

    @OnNeverAskAgain(Manifest.permission.CAMERA)
    void showNeverAskForCamera() {
        Toast.makeText(this, R.string.permission_camera_neverask, Toast.LENGTH_SHORT).show();
    }
}

2. Delegate to generated class

Upon compilation, PermissionsDispatcher generates a class for MainActivityPermissionsDispatcher([Activity Name] + PermissionsDispatcher), which you can use to safely access these permission-protected methods.

The only step you have to do is delegating the work to this helper class:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    findViewById(R.id.button_camera).setOnClickListener(v -> {
      // NOTE: delegate the permission handling to generated method
      MainActivityPermissionsDispatcher.showCameraWithCheck(this);
    });
}

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    // NOTE: delegate the permission handling to generated method
    MainActivityPermissionsDispatcher.onRequestPermissionsResult(this, requestCode, grantResults);
}

Check out the sample and generated class for more details.

Getting Special Permissions

PermissionsDispatcher takes care of special permissions Manifest.permission.SYSTEM_ALERT_WINDOW and Manifest.permission.WRITE_SETTINGS.

The following sample is to grant SYSTEM_ALERT_WINDOW.

0. Prepare AndroidManifest

Add the following line to AndroidManifest.xml:

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

1. Attach annotations

It's the same as other permissions:

@RuntimePermissions
public class MainActivity extends AppCompatActivity {

    @NeedsPermission(Manifest.permission.SYSTEM_ALERT_WINDOW)
    void systemAlertWindow() {
    }

    @OnShowRationale(Manifest.permission.SYSTEM_ALERT_WINDOW)
    void systemAlertWindowOnShowRationale(final PermissionRequest request) {
    }

    @OnPermissionDenied(Manifest.permission.SYSTEM_ALERT_WINDOW)
    void systemAlertWindowOnPermissionDenied() {
    }

    @OnNeverAskAgain(Manifest.permission.SYSTEM_ALERT_WINDOW)
    void systemAlertWindowOnNeverAskAgain() {
    }
}

2. Delegate to generated class

Unlike other permissions, special permissions require to call the delegation method at onActivityResult:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    findViewById(R.id.button_system_alert_window).setOnClickListener(v -> {
      // NOTE: delegate the permission handling to generated method
      MainActivityPermissionsDispatcher.systemAlertWindowWithCheck(this);
    });
}

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

maxSdkVersion

<uses-permission> has an attribute call maxSdkVersion. PermissionsDispatcher support the feature as well.

The following sample is for declaring Manifest.permisison.WRITE_EXTERNAL_STORAGE up to API level 18.

0. AndroidManifest

Declare the permission with maxSdkVersion attribute

<uses-permission
     android:name="android.permission.WRITE_EXTERNAL_STORAGE"
     android:maxSdkVersion="18" />

1. Attach annotations with `maxSdkVersion`

@RuntimePermissions
public class MainActivity extends AppCompatActivity {

    @NeedsPermission(value = Manifest.permission.WRITE_EXTERNAL_STORAGE, maxSdkVersion = 18)
    void getStorage() {
        // ...
    }
    
}

Note

For AndroidAnnotations users

If you use AndroidAnnotations, you need to add AndroidAnnotationsPermissionsDispatcherPlugin to your dependencies so PermissionsDispatcher's looks for AA's subclasses (your project won't compile otherwise).

Download

To add it to your project, include the following in your app module build.gradle file:

${latest.version} is

dependencies {
  compile 'com.github.hotchemi:permissionsdispatcher:${latest.version}' {
      // if you don't use android.app.Fragment you can exclude support for them
      exclude module: "support-v13"
  }
  annotationProcessor 'com.github.hotchemi:permissionsdispatcher-processor:${latest.version}'
}

Snapshots of the development version are available in JFrog's snapshots repository. Add the repo below to download SNAPSHOT releases.

repositories {
  jcenter()
  maven { url 'http://oss.jfrog.org/artifactory/oss-snapshot-local/' }
}

Licence

Copyright 2016 Shintaro Katafuchi, Marcel Schnelle, Yoshinori Isogai

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.

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