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system/RuntimePermissions/kotlinApp/README.md

Android RuntimePermissions Sample (Kotlin)

This sample shows runtime permissions available in Android M and above. It shows how to check and request permissions at runtime, handle backwards compatibility using the support library and how to declare optional permissions for M-devices only.

Introduction

Android M introduced runtime permissions. Applications targeting M and above need to request their permissions at runtime.

All permissions still need to be declared in the AndroidManifest. However, when accessing APIs that require a permission, the Activity or Fragment has to verify that the permission has been granted or request the missing permissions using calls through the support library.

Permissions are checked through ActivityCompat#checkSelfPermission(Context, String) or ContextCompat#checkSelfPermission(Context, String).

Permission are requested through ActivityCompat#requestPermissions(Activity, String[], int), and the response received in a callback to ActivityCompat.OnRequestPermissionsResultCallback#onRequestPermissionsResult(int, String[], int[]).

Applications can provide an additional rational for the use of permissions after calling ActivityCompat#shouldShowRequestPermissionRationale(Activity,String). This call will return true if the application should provide the user with more context on why the requested permissions is needed, for example if the permission request has been denied before.

If an application targets an SDK below M, all permissions are granted at runtime and are available when the application is running. The support library calls handle these checks appropriately. However, if permissions have been turned off in the system settings for an application targeting an SDK below M, the API will return empty or no data.

Pre-requisites

  • Android SDK 26
  • Android Support Repository

Screenshots

Getting Started

This sample uses the Gradle build system. To build this project, use the “gradlew build” command or use “Import Project” in Android Studio.

Support

If you've found an error in this sample, please file an issue: https://github.com/googlesamples/android-RuntimePermissions

Patches are encouraged, and may be submitted by forking this project and submitting a pull request through GitHub. Please see CONTRIBUTING.md for more details.

License

Copyright 2017 The Android Open Source Project, Inc.

Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to you 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.