Android Handler leak 分析及解决办法

静态内部类只能访问外部类的静态成员，因为非静态成员必须依附于某个具体的对象，而静态内部类不需要要

静态内部类可以直接实例化，不需要绑定到外部类上再去实例化

handler出现泄漏的两个原因：

1）message没有清楚干净

2）handler持有的主线程的COntext实例

解决方案：

1) message:在Context的destroy的时候利用handler.removeCallbacksAndMessages(null)来清除

2)静态内部类+WeakReference

public class MyActivity extends Activity {
private MyHandler mHandler;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

mHandler = new MyHandler(this);
}

@Override
protected void onDestroy() {
// Remove all Runnable and Message.
mHandler.removeCallbacksAndMessages(null);

super.onDestroy();
}

static class MyHandler extends Handler {
private WeakReference<MyActivity> mOuter;

public MyHandler(MyActivity activity) {
mOuter = new WeakReference<MyActivity>(activity);
}

@Override
public void handleMessage(Message msg) {
MyActivity outer = mOuter.get();
if (outer != null) {
// Do something with outer as your wish.
}
}
}
}