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I've written a battery monitor widget that I can update when the screen is turned on using a background Service with BroadcastReceivers and an Alarm. I can also stop updating when the screen is turned off. However, the Service only runs until the system stops the background service.

  1. I don't want to use a foreground service because the user does not need to be notified.
  2. Always checking and restarting the background service does not seem like a good solution.
  3. I don't think I can bind a service to a widget. But, I'm new to this and still learning.

How do I get around this problem? I started looking into WorkManager but haven't found what I'm looking for.

Any suggestions to point me in the right direction would be much appreciated.

amm811
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1 Answers1

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You could create a listener class to listen for android lock screen and unlock events，use broadcast to receive the state of screen.

 private class ScreenBroadcastReceiver : BroadcastReceiver
{
private String action = null;

    public override void OnReceive(Context context, Intent intent)
    {
        action = intent.Action;
        if (Intent.ActionScreenOn == action)
        { // screen on
            mScreenStateListener.onScreenOn();
        }
        else if (Intent.ActionScreenOff == action)
        { // screen off
            mScreenStateListener.onScreenOff();
        }
        else if (Intent.ActionUserPresent == action)
        { // unlock
            mScreenStateListener.onUserPresent();
        }
    }
}

For more code for the listener, you could refer to the link below. https://stackoverflow.com/a/55014763/11850033

You could override the OnUpdate of AppWidgetProvider. And then trigger an onUpdate on your Widget. How to call onUpdate method of widget on button click?

Update：

You could try to inprove the level of context.

 mContext.ApplicationContext.RegisterReceiver(mScreenReceiver, filter);
Wendy Zang - MSFT
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