Handler的规范使用

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private static class MyHandler extends Handler {    private final WeakReference<MainActivity> mReference;    public MyHandler(MainActivity activity){        mReference = new WeakReference<MainActivity>(activity);    }    @Override    public void handleMessage(Message msg){        super.handleMessage(msg);        if (msg.what == 0) {            MainActivity mainActivity = mReference.get();            if (mainActivity != null) {                mainActivity.doSomething(msg);            }        }    }}

在fragment中使用：

private static class MyHandler extends Handler {    private final WeakReference<ThreeFragment> mReference;    public MyHandler(ThreeFragment activity){        mReference = new WeakReference<ThreeFragment>(activity);    }    @Override    public void handleMessage(Message msg){        super.handleMessage(msg);        if (msg.what == REFRESH_ADAPTER) {            ThreeFragment activity = mReference.get();            if (activity != null) {                activity.doSomething(msg);            }        }    }}

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