EasyPermissions-ktx 
Kotlin version of the popular googlesample/easypermissions wrapper library to simplify basic system permissions logic on Android M or higher.
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.
Installation
EasyPermissions-ktx is installed by adding the following dependency to your build.gradle file:
dependencies {
implementation 'com.vmadalin:easypermissions-ktx:0.1.0'
}
Usage
Basic
To begin using EasyPermissions-ktx, have your Activity (or Fragment) override the onRequestPermissionsResult method:
class MainActivity : AppCompatActivity() {
override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<String>, grantResults: IntArray) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults)
// EasyPermissions handles the request result.
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, 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 theonPermissionsGrantedcallback.
@AfterPermissionGranted(REQUEST_CODE_LOCATION_AND_CONTACTS_PERMISSION)
private void methodRequiresTwoPermission() {
if (EasyPermissions.hasPermissions(this, ACCESS_FINE_LOCATION, READ_CONTACTS)) {
// Already have permission, do the thing
// ...
} else {
// Do not have permissions, request them now
EasyPermissions.requestPermissions(
host = this,
rationale = getString(R.string.permission_location_and_contacts_rationale_message),
requestCode = REQUEST_CODE_LOCATION_AND_CONTACTS_PERMISSION,
perms = ACCESS_FINE_LOCATION, READ_CONTACTS
)
}
}
Or for finer control over the rationale dialog, use a PermissionRequest:
val request = PermissionRequest.Builder(spyActivity)
.code(REQUEST_CODE)
.perms(REQUEST_CODE_LOCATION_AND_CONTACTS_PERMISSION)
.theme(R.style.my_fancy_style)
.rationale(R.string.camera_and_location_rationale)
.positiveButtonText(R.string.rationale_ask_ok)
.negativeButtonText(R.string.rationale_ask_cancel)
.build()
EasyPermissions.requestPermissions(spyActivity, request)
Optionally, for a finer control, you can have your Activity / Fragment implement the PermissionCallbacks interface.
class MainActivity : AppCompatActivity(), EasyPermissions.PermissionCallbacks {
override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<String>, grantResults: IntArray) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults)
// EasyPermissions handles the request result.
EasyPermissions.onRequestPermissionsResult(requestCode, permissions, grantResults, this)
}
override fun onPermissionsGranted(requestCode: Int, perms: List<String>) {
// Some permissions have been granted
// ...
}
override fun onPermissionsDenied(requestCode: Int, perms: List<String>) {
// 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 fun onPermissionsDenied(requestCode: Int, perms: List<String>) {
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)) {
SettingsDialog.Builder(this).build().show()
}
}
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
super.onActivityResult(requestCode, resultCode, data)
if (requestCode == DEFAULT_SETTINGS_REQ_CODE) {
val yes = getString(R.string.yes)
val no = getString(R.string.no)
// Do something after user returned from app settings screen, like showing a Toast.
Toast.makeText(
this,
getString(
R.string.returned_from_app_settings_to_activity,
if (hasCameraPermission()) yes else no,
if (hasLocationAndContactsPermissions()) yes else no,
if (hasSmsPermission()) yes else no,
if (hasStoragePermission()) yes else no
),
LENGTH_LONG
).show()
}
}
Interacting with the rationale dialog
Implement the EasyPermissions.RationaleCallbacks if you want to interact with the rationale dialog.
override fun onRationaleAccepted(requestCode: Int) {
// Rationale accepted to request some permissions
// ...
}
override fun onRationaleDenied(requestCode: Int) {
// 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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