關於Android中的PollingService定時輪詢任務的講解

標籤：

1.建立PollingThread類，在log列印出“New message!”

class PollingThread extends Thread {        @Override        public void run() {            Log.i("zzf", "Polling...");        }    }

 

2.建立PollingReceiver，用於接收Service傳遞資訊並重新執行PollingService

public class PollingReceiver extends BroadcastReceiver {    @Override    public void onReceive(Context context, Intent intent) {        // TODO Auto-generated method stub        Log.i("zzf", "Receive!");        Intent i = new Intent(context, PollingService.class);        context.startService(i);    }}

 

 

3.建立PollingService定時輪詢任務對象

public class PollingService extends Service {    @Override    public IBinder onBind(Intent intent) {        return null;    }    @Override    public void onCreate() {    }    @Override    public int onStartCommand(Intent intent, int flags, int startId) {        // TODO Auto-generated method stub        //建立PollingThread子線程，用於執行任務        new PollingThread().start();        // 擷取AlarmManager系統服務        AlarmManager manager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);        // 封裝需要執行Service的Intent        Intent i = new Intent(this, PollingReceiver.class);        PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, i, 0);        int anSeconds = 5 * 1000; // 5秒        //  觸發時間        long triggerAtTime = SystemClock.elapsedRealtime() + anSeconds;        manager.set(AlarmManager.ELAPSED_REALTIME_WAKEUP, triggerAtTime, pendingIntent);        return super.onStartCommand(i, flags, startId);    }        

 

4.在MainActivity中啟動PollingService

　　　　 Log.i("zzf","Start polling service...");        Intent intent = new Intent(this, PollingService.class);        startService(intent);

 

關於Android中的PollingService定時輪詢任務的講解