WINDOWING_MODE_FREEFORMstartApp核心思路：这个windowmode需要从FullScreen--->Freeform,需要在startActivity时候携带相关相关参数，把windowmode和launchBounds进行设置。AndroidT+++b/frameworks/base/core/java/android/app/Instrumentation.java@@-1798,6+1798,7