question

Hello,

Can I know if the user turn Off or turn On the phone?

Yes. You can use **BroadCastReceiver**detect turn-on the Phone(Note: Please test following way in the physical device).

Step 1 Create a BroadCastReceiver like following code in your Xamarin Forms Android project.

[BroadcastReceiver(Enabled = true, Exported = false)]
    [IntentFilter(new[] { "android.intent.action.BOOT_COMPLETED" })]
    public class DeviceTrunOnReceiver : BroadcastReceiver
    {
        public override void OnReceive(Context context, Intent intent)
        {
            Toast.MakeText(context, "Received intent!", ToastLength.Short).Show();
        }
    }

Step 2: Register this broadcast in AndroidManifest.xml, and add RECEIVE_BOOT_COMPLETED permission.

<!-- ... -->
<application android:label="App4.Android" android:theme="@style/MainTheme">
        <receiver android:name=".DeviceTrunOnReceiver" android:enabled="true" 
                        android:permission="android.permission.RECEIVE_BOOT_COMPLETED">
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </receiver>
    </application>
<!-- Don't forget about permission -->
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>

Best Regards,
Leon Lu

---

If the answer is the right solution, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.