PorterduffXfermode: Clear a section of a bitmap

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The problem is hardware acceleration. Turn it OFF for the particular View that you are painting with CLEAR. If you’re using a custom view, do this in the constructors:

if (android.os.Build.VERSION.SDK_INT >= 11) 
{
     setLayerType(View.LAYER_TYPE_SOFTWARE, null);
}

You can also call setLayerType on a view reference.

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