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:1.0.1'
}
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
AfterPermissionGrantedannotation. 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 theonPermissionsGrantedcallback.
@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();
}
}
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.