/**
         * 把View绘制到Bitmap上
         * @param view 需要绘制的View
         * @param width 该View的宽度
         * @param height 该View的高度
         * @return 返回Bitmap对象
         */
        public static Bitmap getBitmapFromView(View view,int width,int height) {
                int widthSpec = View.MeasureSpec.makeMeasureSpec(width, View.MeasureSpec.EXACTLY);
                int heightSpec = View.MeasureSpec.makeMeasureSpec(height, View.MeasureSpec.EXACTLY);
                view.measure(widthSpec, heightSpec);
                view.layout(0, 0, width, height);
                Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
                Canvas canvas = new Canvas(bitmap);
                view.draw(canvas);

                return bitmap;
        }

Android ViewToBitmap