android 在onReciver里面使用定时器 定时更新UI的例子

android 在onReciver里面使用定时器 定时更新UI的例子

在定时器线程里面是不能直接更新UI的，需要使用Handle，使用Handle可以注册个广播，在定时到时且条件符合情况下发送一个广播

Handler收到广播后处理更新UI相关操作，这里还演示了下传送Context变量作为定时器的构造函数值的方法（如果需要在run方法使用到Context可以用）

下面代码是工程里面的，需要参考的人把无关的代码删除了 留下骨架改成自己的就可以了 

 1 private final BroadcastReceiver mConn_Receiver = new BroadcastReceiver() {
 2         @Override
 3         public void onReceive(Context context, Intent intent) {
 4             String action = intent.getAction();
 5             if (BluetoothGatt.ACTION_GATT_CONNECTED.equals(action)) {
 6                 //启动定时器
 7                 proximityAlarm(2,context);
 8             }
 9         }
10     }
11 
12 private final static String PROXIMITY_ALARM_ACTION = "com.cyberblue.iitag.proximityalarm";
13     private ProximityAlarmRecevier pReceiver;
14     //延迟报警
15     public void proximityAlarm(int second,Context context){
16         Log.i(TAG,"Enter proximityAlarm second=" + second);
17         
18         if(pReceiver == null){
19             pReceiver = new ProximityAlarmRecevier();
20             registerReceiver(pReceiver, new IntentFilter(PROXIMITY_ALARM_ACTION));
21         }
22         
23         Timer time = new Timer(); 
24         ProximityAlarmTimerTask task = new ProximityAlarmTimerTask(context); 
25         //dalay/1000秒后执行task.只执行一次
26         time.schedule(task, second*1000);
27     }
28     
29 public class ProximityAlarmTimerTask extends TimerTask {
30         private Context context;
31         public ProximityAlarmTimerTask(Context mcontext){
32             context = mcontext;
33         }
34         public void run(){
35         Log.i(TAG,"Enter ProximityAlarmTimerTask");
36             if(mLeState == CONNECTED){
37                 return ;
38             }else{
39                 Intent intent = new Intent(PROXIMITY_ALARM_ACTION);
40                 sendBroadcast(intent);
41             }
42         } 
43     }
44     
45     public class ProximityAlarmRecevier extends BroadcastReceiver {
46         @Override
47         public void onReceive(Context context, Intent intent) {
48             Log.i(TAG,"Enter ProximityAlarmRecevier");
49             pHandler.sendEmptyMessage(0);
50         }
51     }
52     
53     //处理重连
54     Handler pHandler = new Handler() {
55         public void handleMessage(Message msg) {
56             Log.i(TAG,"Enter pHandler");
57             switch (msg.what) {
58             case 0:
59                 //停止上一次的音乐
60                 stopMusic();
61                 //停止振动
62                 cancelVibrator();
63                 //点亮屏幕
64                 final PowerManager.WakeLock wl = wekelock();
65                 vibrator();
66                 playMusic();
67                 //只保留最后一个报警窗口
68                 if(view != null){
69                     wm.removeView(view);
70                 }
71                 view = inflater.inflate(R.layout.proximity_result, null);
72                 wm.addView(view, wmParams);
73                 Button proximitytagBtn = (Button) view.findViewById(R.id.proximitytagBtn);
74                 proximitytagBtn.setOnClickListener(new OnClickListener() {
75                     @Override
76                     public void onClick(View v) {
77                         //移除WindowManager
78                         wm.removeView(view);
79                         view = null;
80                         //停止音乐
81                         stopMusic();
82                         //停止振动
83                         cancelVibrator();
84                         if(wl != null && wl.isHeld()){
85                             wl.release();
86                         }
87                     }
88                 });
89                 closeWakeLock(120,wl);
90                 
91                 break;
92             }
93             super.handleMessage(msg);
94         }
95     };