【优化】Handler可能发生泄漏

转载

mob604756ebed9f 2013-04-11 14:21:00


 1     private Handler mHandler = new Handler() {
 2         public void handleMessage(Message msg) {
 3             switch (msg.what) {
 4             case 1: {
 5                 break;
 6             case 2:
 7                 break;
 8             }
 9         }
10     };

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。

 1     private MyHandler handler;
 2       
 3     private static class MyHandler extends Handler {
 4         // PayActivity是本Activity类
 5         WeakReference<PayActivity> aaa = null;
 6         public MyHandler(PayActivity bbb) {
 7             this.aaa = new WeakReference<PayActivity>(bbb);
 8         }
 9         public void handleMessage(Message msg) {
10             PayActivity payF = aaa.get();
11             if (payF == null)
12                 return;
13 
14             switch (msg.what) {
15             case 1:
16                 break;
17             case 2:
18                 payF.deal(msg);
19                 break;
20             }
21 
22         };
23     };
24 
25     // 在onCreate()方法里面实例化MyHandler
26     handler = new MyHandler(this);