View转化为bitmap

private Bitmap getViewBitmap(View v) {
        v.clearFocus();
        v.setPressed(false);   

        boolean willNotCache = v.willNotCacheDrawing();
        v.setWillNotCacheDrawing(false);   

        // Reset the drawing cache background color to fully transparent
        // for the duration of this operation
        int color = v.getDrawingCacheBackgroundColor();
        v.setDrawingCacheBackgroundColor(0);   

        if (color != 0) {
            v.destroyDrawingCache();
        }
        v.buildDrawingCache();
        Bitmap cacheBitmap = v.getDrawingCache();
        if (cacheBitmap == null) {
            Log.e("TTTTTTTTActivity", "failed getViewBitmap(" + v + ")", new RuntimeException());
            return null;
        }   

        Bitmap bitmap = Bitmap.createBitmap(cacheBitmap);   

        // Restore the view
        v.destroyDrawingCache();
        v.setWillNotCacheDrawing(willNotCache);
        v.setDrawingCacheBackgroundColor(color);   

        return bitmap;
    }