Android开发:View内容生成图片

生成图片的操作比较耗时，虽然是View对象，但咱是直接把View对象转成图片，不涉及修改UI显示，可以异步处理。

contentLayout.setDrawingCacheEnabled(true);
contentLayout.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),
MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
contentLayout.layout(0, 0, contentLayout.getMeasuredWidth(),
contentLayout.getMeasuredHeight());
contentLayout.buildDrawingCache();
Bitmap bitmap= contentLayout.getDrawingCache();