When you opens this app, it will ask for a permission to be a Admin app because just with it, SaoriLoki can lock your screen without the button on the side of your device.
Create a class that extends DeviceAdminReceiver to receive the events when the user gives the permission to the app to be a admin.
In this case, we just need the permission itself and not to be warned when this happens. So the receiver needs to be created, but it can be "empty":
import android.app.admin.DeviceAdminReceiver
class MyDeviceAdminReceiver: DeviceAdminReceiver()<receiver android:name="br.com.luisfelipeas5.saoriblock.MyDeviceAdminReceiver"
android:label="@string/sample_device_admin"
android:description="@string/sample_device_admin_description"
android:permission="android.permission.BIND_DEVICE_ADMIN">
<meta-data android:name="android.app.device_admin"
android:resource="@xml/device_admin_sample" />
<intent-filter>
<action android:name="android.app.action.DEVICE_ADMIN_ENABLED" />
</intent-filter>
</receiver>