java - How to change the snapshot shown by recent apps list?

Question

In the newer versions of Android (> 3.0) there is an onscreen button that will display a list of the recent apps with their names and snapshots. Even though my app itself is password protected, this overview might show sensitive data in that snapshot. So is there any way to force a certain image (like a logo) to be shown rather than let the OS decide?

Answer 1

It seems to be impossible for now. There's a method called onCreateThumbnail but it is not used currently by the system I guess, since it is not called. I see two possible solutions:

1. To disable thumbnail on the activity containing sensitive data by adding FLAG_SECURE to your window: getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);
2. To exclude your activities from recent apps, set android:excludeFromRecents attribute to true for activities in AndroidManifest.xml