卜若的代码笔记-android开发的108个技巧-第10个技巧：View转Bitmap

public Bitmap getViewBitmap(View comBitmap, int width, int height) {
        Bitmap bitmap = null;
        if (comBitmap != null) {
            comBitmap.clearFocus();
            comBitmap.setPressed(false);

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

            // Reset the drawing cache background color to fully transparent
            // for the duration of this operation
            int color = comBitmap.getDrawingCacheBackgroundColor();
            comBitmap.setDrawingCacheBackgroundColor(0);
            float alpha = comBitmap.getAlpha();
            comBitmap.setAlpha(1.0f);

            if (color != 0) {
                comBitmap.destroyDrawingCache();
            }

            int widthSpec = View.MeasureSpec.makeMeasureSpec(width, View.MeasureSpec.EXACTLY);
            int heightSpec = View.MeasureSpec.makeMeasureSpec(height, View.MeasureSpec.EXACTLY);
            comBitmap.measure(widthSpec, heightSpec);
            comBitmap.layout(0, 0, width, height);

            comBitmap.buildDrawingCache();
            Bitmap cacheBitmap = comBitmap.getDrawingCache();
            if (cacheBitmap == null) {

                        new RuntimeException()
                        ;
                return null;
            }
            bitmap = Bitmap.createBitmap(cacheBitmap);
            // Restore the view
            comBitmap.setAlpha(alpha);
            comBitmap.destroyDrawingCache();
            comBitmap.setWillNotCacheDrawing(willNotCache);
            comBitmap.setDrawingCacheBackgroundColor(color);
        }
        return bitmap;
    }