Let

Annotation based simple API flavoured with AOP to handle new Android runtime permission model.

If you check Google's Samples about the new permission model, you'll see a lot of boiler plate code for requesting, handling and retrying the request for required permissions.

Let will minimize the boiler plate code you have to write for requesting and handling permissions and hence help you keep your code more readable.

Let let Handle

Annotate your methods requiring permissions with @AskPermission and let Let handle the rest.

@AskPermission(ACCESS_FINE_LOCATION)
private void getUserLocationAndDoSomething() {
    Toast.makeText(
        SampleActivity.this, 
        "Now that I have the permission I need, I'll get your location and do something with it", 
        Toast.LENGTH_SHORT
    ).show();
    ...
}

@AskPermission({
            Manifest.permission.READ_CONTACTS,
            Manifest.permission.CALL_PHONE,
            Manifest.permission.CAMERA
})
private void skipTutorial() {
    // permissions needed for the best app experience are granted; let's go to the app's home screen
    startActivity(new Intent(this, HomeActivity.class));
}

Let will check these annotated methods and execute them unless the permissions required are granted; otherwise Let will put on hold the method execution and request these permissions at runtime. After examining the permission request result, Let will execute the method already put on hold only if the permissions are granted by user.

Let will also inform about the rationales before making any permission request and tell about denied permissions; whether they're simply denied or with 'Never Ask Again' checked.

Just make sure to override the onRequestPermissionsResult in your Activity or Fragment, where your @AskPermission annotated methods are located:

@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
    Let.handle(this, requestCode, permissions, grantResults);
}

And make sure your Activity or Fragment implements RuntimePermissionListener in order to get notified about denied permissions and rationales:

public class SampleActivity extends AppCompatActivity implements RuntimePermissionListener {
    
    // ....
    
    @Override
    public void onShowPermissionRationale(List<String> permissions, final RuntimePermissionRequest request) {
        /**
        * you may show permission rationales in a dialog, wait for user confirmation and retry the permission 
        * request by calling request.retry()    
        */               
    }
  
    @Override
    public void onPermissionDenied(List<DeniedPermission> deniedPermissionList) {
        /**
        * Do whatever you need to do about denied permissions:
        *   - update UI
        *   - if permission is denied with 'Never Ask Again', prompt a dialog to tell user
        *   to go to the app settings screen in order to grant again the permission denied 
        */              
    }
    
    //  ...
}

Usage

Add it to your project today!

buildscript {
    repositories {                    
        jcenter()        
    }

    dependencies {        
        classpath 'com.canelmas.let:let-plugin:0.1.11'
    }
}

apply plugin: 'com.android.application'
apply plugin: 'let'

repositories {        
    jcenter()
}

For kotlin :

buildscript {
    repositories {
        jcenter()
    }

    dependencies {
        classpath 'com.canelmas.let:let-plugin:1.0.0-beta1'
    }
}

apply plugin: 'com.android.application'
apply plugin: 'let'

repositories {
    jcenter()
}

Proguard

Make sure your proguard rule set includes following lines:

-keep class com.canelmas.let.** { *; }
-keepnames class * implements com.canelmas.let.RuntimePermissionListener

-keepclassmembers class * implements com.canelmas.let.RuntimePermissionListener {
    public void onRequestPermissionsResult(***);
}

-keepclasseswithmembernames class * {
    @com.canelmas.let.* <methods>;
}

License

Copyright 2016 Can Elmas

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.