android4.3以后的截屏笔记

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参考了http://tech.ddvip.com/2014-05/1399380786210254.html

很详细的解说，

android4.3以后Surface下的screenshot方法移到SurfaceControl下去了

而且SurfaceControl已经@hide

只好通过反射方法来调用

Bitmap bit = null;
WindowManager mWindowManager;
DisplayMetrics mDisplayMetrics;
Display mDisplay;
mWindowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
mDisplay = mWindowManager.getDefaultDisplay();
mDisplayMetrics = new DisplayMetrics();
mDisplay.getRealMetrics(mDisplayMetrics);
float[] dims = { mDisplayMetrics.widthPixels, mDisplayMetrics.heightPixels };

Class mclass = Class.forName("android.view.SurfaceControl");
Method method = mclass.getMethod("screenshot", new Class[] {int.class, int.class});
Object obj = method.invoke(mclass, new Object[]{(int) dims[0],(int) dims[1]});
bit =(Bitmap)obj;

同样需要添加android:name="android.permission.READ_FRAME_BUFFER

以及android:sharedUserId="android.uid.system"

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