There is a method `onCreateThumbnail()`[1] that is supposed to allow you to do this, but it doesn't appear to work (reported bugs in 4.0-4.2). The best you can

There is a method `onCreateThumbnail()`[1] that is supposed to allow you to do this, but it doesn't appear to work (reported bugs in 4.0-4.2). The best you can get at the moment is to blank out the thumbnail[2] (for security reasons) or opt out of being shown in the list [3]. [1]: http://developer.android.com/reference/android/app/Activity.html#onCreateThumbnail(android.graphics.Bitmap%2C%20android.graphics.Canvas) http://developer.android.com/reference/android/app/Activity.... [2]: http://commonsware.com/blog/2012/01/16/secure-against-screenshots.html http://commonsware.com/blog/2012/01/16/secure-against-screen... [3]: Use android:excludeFromRecents="true"