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javaandroiddrawablewallpaper

How to update an activitys background when it's set to the systems wallpaper?

I have this code which allows me to set the current device wallpaper as my activitys background. 

public void wallpaperBackground()
    {
        WallpaperManager wallpaperManager = WallpaperManager.getInstance(this);
        Drawable wallpaperDrawable = wallpaperManager.getDrawable();

        View root = findViewById(R.id.home_view);
        root.setBackground(wallpaperDrawable);
    }

The problem is, if I change the wallpaper via settings it doesn't update on my app and I'm left with the previous wallpaper. How can I fix this?

Solution

  • It is quite easy actually:

    Just call your wallpaperBackground() method in onResume() in your activity.

    This will automatically apply the correct wallpaper when the activity resumes after the user comes back from another app.