display.save don't work on Android 3.0

Solar2D Android
#1

I refer ScreenCaptureToFile sample code to write my code, but read image file captured is a black image.
So I directly use the ScreenCaptureToFile to install my Tablet (Acer ICONIA A500, Android 3.0).
But the capture function is failure, there is no change after tapping the screen.

What is the possible cause? I guess Android version (3.0) or use System.DocumentDirectory as save path.
I try to use System.TemporaryDirectory as save path, but it is failure too. Please Help! [import]uid: 51300 topic_id: 10494 reply_id: 310494[/import]

#2

I use display.captureScreen to replace with display.save. It is OK on Android 3.0 [import]uid: 51300 topic_id: 10494 reply_id: 38225[/import]