带阴影视图的 Android 屏幕截图

Question

I'm trying to take a screenshot of a CardView that has a shadow (elevation). However, the screenshot comes out without the shadow.
Any ideas?

This is my code:

View v = mView.RootView;
v.DrawingCacheEnabled = true;
Bitmap b = v.DrawingCache;

Answer 1

Shadows ( Elevation In API25+) are hardware accelerated and are not available for caching at the view level.

Also if you turn off the hardware acceleration for a View (actually its parent) than the elevation effect is also disable thus not available for caching...

(aView.Parent as View).SetLayerType(LayerType.Software, null);

A View Cache Capture Example:

Bitmap CaptureView(View view)
{
    if (view.IsHardwareAccelerated)
        Toast.MakeText(ApplicationContext, "View Is Hardware Accelerated, Effects will not be captured", ToastLength.Long).Show();
    view.BuildDrawingCache();
    Bitmap bitmap = view.GetDrawingCache(false);
    Bitmap bitmapCopy = bitmap.Copy(Bitmap.Config.Argb8888, false);
    view.DestroyDrawingCache();
    return bitmapCopy;
}