【优化】Handler可能发生泄漏

 1     private Handler mHandler = new Handler() {
        public void handleMessage(Message msg) {
            switch (msg.what) {
            case 1: {
                break;
            case 2:
                break;
            }
        }
    };

     一般写Handler的时候会向以上这么写，这样写话的话，Eclipse会提示“This Handler class should be static or leaks might occur ”  大概意思是这个Handler类应该是静态的或可能发生泄漏。所以需要修改成以下这种写法。

    private MyHandler handler;
      
    private static class MyHandler extends Handler {
        // PayActivity是本Activity类
        WeakReference<PayActivity> aaa = null;
        public MyHandler(PayActivity bbb) {
            this.aaa = new WeakReference<PayActivity>(bbb);
        }
        public void handleMessage(Message msg) {
            PayActivity payF = aaa.get();
            if (payF == null)
                return;

            switch (msg.what) {
            case 1:
                break;
            case 2:
                payF.deal(msg);
                break;
            }

        };
    };

    // 在onCreate()方法里面实例化MyHandler
    handler = new MyHandler(this);

   这样就O了。