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1.LocaActivityManager am = new LocalActivityManager(Context,true);
2.Window window = am.startActivity("tag",new Intent());
3.View view = window.getDecorView();
接下來一定要在3個生命周期函數里調用如下方法,否則會拋出異常:java.lang.IllegalStateException: Activities can't be added until the containing group has been created.
onCreate()方法里調用am.dispatchCreate(savedInstanceState);
onPause()方法里調用am.dispatchPause(true);
onResume()方法里調用am.dispatchResume();
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