手机有Root，需要能在100ms左右完成截图并返回Bitmap的功能
目前了解到的想要获取到截图的Bitmap有几种
1：利用系统命令screenshot/screencap -p ，然后再读取，受手机限制，至少1500-2000ms，我在魅族MX5上反而用了3000。。完全无法忍受。
2：利用ddmlib，效率更低。。
3：读取framebuffer，这个在4.2以后的版本就失败了。只能读取黑屏或者带手机厂商logo的黑图。
4：反射系统自带的SurfaceControl方法，失败的，操作后没有任何提示，也得不到结果。
5：自编译的android.jar。方法可以调用，依然是操作后没有任何提示，应该是要添加systemuid。但是这样编译的话，只能在少部分手机上才能用，没什么意义。
6：在5.1以上版本使用MediaProjection，只需要60ms，不过不兼容5.1以下版本
目前用的是第一种，不过截屏效率实在太慢了。
不知道还有没有别的效率高点的办法，求大神赐救~~
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Get the drawing cache information directly view.getDrawingCache()
Then createBitmap I do this
My phone is not rooted and there is a surfaceview on the screen to be captured. How can I implement the screen capture function?
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