java - 更改应用程序的背景

Question

示例代码如下:

        WallpaperManager wallpaperManager1 = WallpaperManager
                .getInstance(getApplicationContext()); 

        final Drawable wallpaperDrawable1 = wallpaperManager1.getDrawable();
        getWindow().setBackgroundDrawable(wallpaperDrawable1);

        if (wallpaperDrawable1==null)
        {                       
            Resources res = getResources();
            Drawable drawable1=res.getDrawable(R.drawable.bg1);
            getWindow().setBackgroundDrawable(drawable1);

        }

我想在我的应用程序中获取系统背景，如果它不存在或者如果用户删除它，那么我想从我的应用程序中设置一个默认图像以设置为应用程序背景。希望一切都清楚....

Answer 1

要查看当前系统是否有墙纸，您可以使用 peekDrawable() :

final Drawable wallpaperDrawable1 = wallpaperManager1.peekDrawable();

还有，你错过了else:

if (wallpaperDrawable1==null)
{                       
    Resources res = getResources();
    Drawable drawable1=res.getDrawable(R.drawable.bg1);
    getWindow().setBackgroundDrawable(drawable1);

}
else
{
    getWindow().setBackgroundDrawable(wallpaperDrawable1);
}