Android webview screenshot in case of hardware acceleration

I want to get a screenshot of webview，and code show as follow:


View view = myWebView;
Bitmap mBitmap = Bitmap.createBitmap(view.getMeasuredWidth(), view.getMeasuredHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(mBitmap);
view.draw(canvas);



View view = myWebView;
Bitmap mBitmap = Bitmap.createBitmap(view.getMeasuredWidth(), view.getMeasuredHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(mBitmap);
view.draw(canvas);


It doesn‘t works under hardware acceleration(webView or activity set), when i turn off hardware acceleration, I can get a normal screenshot, otherwise it is a white screen。

test url is : http://cdn.codeboy.me/canvas.html

and then screen before hardware acceleration turn on:

and after hardware acceleration turn on:

Is any way to get webView's screenshot under hardware acceleration(just webView and not window or decorView), and anybody can explain why it doesn't work when turn on hardware acceleration.

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