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googlesamples
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Description

Simplify Android M system permissions

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EasyPermissions Build Status Code Coverage Android Weekly

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 {
    // For developers using AndroidX in their applications
    implementation 'pub.devrel:easypermissions:3.0.0'

// For developers using the Android Support Library
implementation 'pub.devrel:easypermissions:2.0.1'

}

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
    AfterPermissionGranted
    annotation. This is optional, but provided for convenience. If all of the permissions in a given request are granted, all methods annotated with the proper request code will be executed(be sure to have an unique request code). The annotated method needs to be void and without input parameters (instead, you can use onSaveInstanceState in order to keep the state of your suppressed parameters). 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 the
    onPermissionsGranted
    callback.
@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);
    }
}

Or for finer control over the rationale dialog, use a

PermissionRequest
:
EasyPermissions.requestPermissions(
        new PermissionRequest.Builder(this, RC_CAMERA_AND_LOCATION, perms)
                .setRationale(R.string.camera_and_location_rationale)
                .setPositiveButtonText(R.string.rationale_ask_ok)
                .setNegativeButtonText(R.string.rationale_ask_cancel)
                .setTheme(R.style.my_fancy_style)
                .build());

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:

Note: Due to a limitation in the information provided by the Android framework permissions API, the

somePermissionPermanentlyDenied
method only works after the permission has been denied and your app has received the
onPermissionsDenied
callback. Otherwise the library cannot distinguish permanent denial from the "not yet denied" case.
@Override
public void onPermissionsDenied(int requestCode, List 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();
}

}

Interacting with the rationale dialog

Implement the

EasyPermissions.RationaleCallbacks
if you want to interact with the rationale dialog.
@Override
public void onRationaleAccepted(int requestCode) {
    // Rationale accepted to request some permissions
    // ...
}

@Override public void onRationaleDenied(int requestCode) { // Rationale denied to request some permissions // ... }

Rationale callbacks don't necessarily imply permission changes. To check for those, see the

EasyPermissions.PermissionCallbacks
.

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.

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