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如果您在Activity中定义了一个内部Handler类,如下代码:
public class MainActivity extends Activity { private Handler mHandler = new Handler() { @Override public void handleMessage(Message msg) { //TODO handle message... } }; @TargetApi(11) @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mHandler.sendMessageDelayed(Message.obtain(), 60000); //just finish this activity finish(); } }
This Handler class should be static or leaks might occur (com.example.ta.MainActivity.1) Issue: Ensures that Handler classes do not hold on to a reference to an outer class Id: HandlerLeak In Android, Handler classes should be static or leaks might occur. Messages enqueued on the application thread’s MessageQueue also retain their target Handler. If the Handler is an inner class, its outer class will be retained as well. To avoid leaking the outer class, declare the Handler as a static nested class with a WeakReference to its outer class.
private Handler mHandler = new MyHandler(this); private static class MyHandler extends Handler{ private final WeakReference<Activity> mActivity; public MyHandler(Activity activity) { mActivity = new WeakReference<Activity>(activity); } @Override public void handleMessage(Message msg) { System.out.println(msg); if(mActivity.get() == null) { return; } } }
对Activity的onDestroy时需要对Handle的message进行remove,其实不止是Handler,对Activity有所引用的在activity有所引用的也最好在activity的finish时进行release。