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ActThreadTest

//isRunning = false;//不主动关闭inner thread,子线程持有activity引用,子线程一直运行着,activity就永远不会被gc
//outerThread.close();//不主动关闭outer thread,子线程持有 handler的弱引用,handler持有activity的弱引用,activity关闭后,主动GC,handler和activity对象都能被回收,子线程仍然运行着
//outerListenerThread.close();//不主动关闭outer listener thread,listener持有activity的引用,thread持有listener引用,activity关闭后,thread还在运行,listener没有释放,activity也不会被GC
//btn4 这种情况下outerListener持有activity的弱引用,所以activity关闭后,主动GC,activity可以被回收,子线程仍然运行

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