Question

I’m building a homescreen widget and my goal is to set an image on the ImageView within this widget and I use setImageViewResource() for this. And it works perfectly – means that the target image R.id.user_button changes its image resource to R.drawable.activity_notification after onStart() was executed – if I use it like this:

public class UpdateWidgetService extends Service {
    public void onStart(Intent intent, int startId) {
        ... //Some code which is not really important
        RemoteViews remoteViews = new RemoteViews(this.getPackageName(),R.layout.widget_layout);
        remoteViews.setImageViewResource(R.id.user_button, R.drawable.activity_notification);
    }
}

The problem is I have to put setImageViewResource() inside an external function and when try to build something like the code below it refuses to work – means that image resource of the target image R.id.user_button remains unchanged after onStart() is executed.

public class UpdateWidgetService extends Service {
    public void onStart(Intent intent, int startId) {
        ... //Some code which is not really important
        changeImagePicture();
    }
    public void changeImagePicture() {
        RemoteViews remoteViews = new RemoteViews(this.getPackageName(),R.layout.widget_layout);
        remoteViews.setImageViewResource(R.id.user_button, R.drawable.activity_notification);
    }
}

I guess I’m a noob and I miss something really simple and very important here. Can you please point at my misstake so I can get my code to work at last 😉
Merci beaucoup!

Answer 1

You need to use the updateAppWidget method of the AppWidgetManager class:

AppWidgetManager manager = AppWidgetManager.getInstance(context);
manager.updateAppWidget(thisWidget, remoteViews);

Good luck….