安排一個TimerTask在特定時間每天一次在一個服務在Android

Question

我有一個TimerTask對象timerTask。我的代碼正在運行，但最初服務啓動時，我的計時器任務會在指定時間即下午3:30之前立即運行，但我希望它僅在每天的下午3:30運行一次。

Calendar cal = Calendar.getInstance(); 
cal.set(Calendar.AM_PM, Calendar.PM); 
cal.set(Calendar.HOUR, 3);  
cal.set(Calendar.MINUTE, 30); 
cal.set(Calendar.SECOND, 0); 
Date date = cal.getTime(); 
timer.schedule(timerTask, date, 1000*60*60*24); // once per day 

Answer 1

至於其他社區用戶建議，不要使用TimerTask的，android有 AlarmManager

，您可以使用。

如何？

1. 註冊報警經理廣播接收器，還有覆蓋（當alamr被激發做什麼）
2. 設置要執行日常的間隔和時間報警的onReceive方法。

---

這裏摘錄如實施例：

public class MainActivity extends Activity { 
private static final String TAG ="MainActivity"; 
PendingIntent myPendingIntent; 
AlarmManager alarmManager; 
BroadcastReceiver myBroadcastReceiver; 
Calendar firingCal; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    //Register AlarmManager Broadcast receive. 
    firingCal= Calendar.getInstance(); 
    firingCal.set(Calendar.HOUR, 8); // At the hour you want to fire the alarm 
    firingCal.set(Calendar.MINUTE, 0); // alarm minute 
    firingCal.set(Calendar.SECOND, 0); // and alarm second 
    long intendedTime = firingCal.getTimeInMillis(); 

    registerMyAlarmBroadcast(); 
    alarmManager.set(AlarmManager.RTC_WAKEUP, intendedTime , AlarmManager.INTERVAL_DAY , myPendingIntent); 
} 

private void registerMyAlarmBroadcast() 
{ 
     Log.i(TAG, "Going to register Intent.RegisterAlramBroadcast"); 

    //This is the call back function(BroadcastReceiver) which will be call when your 
    //alarm time will reached. 
    myBroadcastReceiver = new BroadcastReceiver() 
    { 
     @Override 
     public void onReceive(Context context, Intent intent) 
     { 
      Log.i(TAG,"BroadcastReceiver::OnReceive()"); 
      Toast.makeText(context, "Your Alarm is there", Toast.LENGTH_LONG).show(); 
     } 
    }; 

    registerReceiver(myBroadcastReceiver, new IntentFilter("com.alarm.example")); 
    myPendingIntent = PendingIntent.getBroadcast(this, 0, new Intent("com.alarm.example"),0); 
    alarmManager = (AlarmManager)(this.getSystemService(Context.ALARM_SERVICE)); 
} 
private void UnregisterAlarmBroadcast() 
{ 
    alarmManager.cancel(myPendingIntent); 
    getBaseContext().unregisterReceiver(myBroadcastReceiver); 
} 

@Override 
protected void onDestroy() { 
    unregisterReceiver(myBroadcastReceiver); 
    super.onDestroy(); 
} 
} 

---

編輯：

如果能在App取決於用戶輸入動態地改變的時間，那麼就改日曆燒製可調整時間的變量。