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我正在编写一个包含服务的应用程序。这个服务应该做一些长期运行的后台活动，比如获取地理坐标。现在，我希望此服务在特定时间间隔后通知应用程序要完成某些事情，例如警报。我在这部分有困惑。我没有得到，我怎样才能让服务更新应用程序的一些操作，然后显示一些警报警报等。

下面是我的代码，

活动：

public class BroadcastTest extends Activity {
      private static final String TAG = "BroadcastTest";
      private Intent intent;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    intent = new Intent(this, BroadcastService.class);
}

private BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        updateUI(intent);
    }
};

@Override
public void onResume() {
    super.onResume();
    startService(intent);
    registerReceiver(broadcastReceiver, new IntentFilter(
            BroadcastService.BROADCAST_ACTION));
}

@Override
public void onPause() {
    super.onPause();
    unregisterReceiver(broadcastReceiver);
    stopService(intent);
}

private void updateUI(Intent intent) {
    boolean gps = intent.getBooleanExtra("gps", false);
    if (gps) {
        String counter = intent.getStringExtra("counter");
        String time = intent.getStringExtra("time");
        // Log.d(TAG, counter);
        // Log.d(TAG, time);

        TextView txtDateTime = (TextView) findViewById(R.id.txtDateTime);
        TextView txtCounter = (TextView) findViewById(R.id.txtCounter);
        txtDateTime.setText(time);
        txtCounter.setText(counter);
    } else {


    }
}

}

服务：

 public class BroadcastService extends Service {
  private static final String TAG = "BroadcastService";
  public static final String BROADCAST_ACTION = "";
  private final Handler handler = new Handler();
  Intent intent;
  int counter = 0;

GPSTracker gps;

@Override
public void onCreate() {
    super.onCreate();

    intent = new Intent(BROADCAST_ACTION);

    //Notification notification = new Notification(R.drawable.icon, "MyService", 1000);
    //Intent notifIntent = new Intent(this, BroadcastTest.class);
    //PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, notifIntent, 0);
    //notification.setLatestEventInfo(getApplicationContext(), "ForeGroundService", "Service is Running", pendingIntent);
    //startForeground(1, notification);
}

@Override
public void onStart(Intent intent, int startId) {
    handler.removeCallbacks(sendUpdatesToUI);
    handler.postDelayed(sendUpdatesToUI, 1000); // 1 second

}

private Runnable sendUpdatesToUI = new Runnable() {
    public void run() {
        DisplayLoggingInfo();
        handler.postDelayed(this, 10000); // 10 seconds
    }
};

private void DisplayLoggingInfo() {
    gps = new GPSTracker(getApplicationContext());
    double latitude = 0, longitude = 0;

    // check if GPS enabled
    System.out.println(gps.isGPSEnabled); 
     if (gps.canGetLocation()) {
        latitude = gps.getLatitude();
        longitude = gps.getLongitude();

    } else {
        // can't get location
        // GPS or Network is not enabled
        // Ask user to enable GPS/network in settings
        //gps.showSettingsAlert();

    }


    Log.d(TAG, "entered DisplayLoggingInfo");
    intent.putExtra("time", Double.toString(latitude)); 
    intent.putExtra("counter", Double.toString(longitude)); 
    sendBroadcast(intent);
}

@Override
public IBinder onBind(Intent intent) {
    return null;
}

@Override
public void onDestroy() {
    handler.removeCallbacks(sendUpdatesToUI);
    super.onDestroy();
}
 }

任何人都可以告诉我如何在特定时间间隔后触发应用程序，例如 4 小时后或 50 公里后显示通知

4

1 回答 1

1

这是我在后台服务onStartCommand函数中写的

      public class Xyz extends Service{

        public int onStartCommand(Intent intent, int flags, int startId) {
                TimerTask geo = new TimerTask(){

                                  public void run(){

        if(your condition)
            {
                Uri soundrui = RingtoneManager
                                            .getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
                                    Intent intent = new Intent(getApplicationContext(),
                                            AcitivitytoOpenOnNotificationClick.class);
                                    intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
                                    PendingIntent p = PendingIntent.getActivity(
                                            getApplicationContext(), 0, intent, 0);
                                    Notification msg = new NotificationCompat.Builder(
                                            getApplicationContext())
                                            .setContentTitle("Your App")
                                            .setContentText("Your Notification")
                                            .setContentInfo(""+count)
                                            .setSmallIcon(R.drawable.ic_launcher)
                                            .setAutoCancel(true)
                                            .setContentIntent(p).build();
                                    NotificationManager nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
                                    nm.notify("App tag", 0, msg);
            }


        }
        }

            }

           Timer t = new Timer();
           t.schedule(geo/*TimerTask object*/,long delay_before_first_execution, long period );
return super.onStartCommand(intent, flags, startId);
    }
    //End of startcommand
    public void onDestroy() {
            // TODO Auto-generated method stub
            super.onDestroy();
            //Dont forget to cancel the timer.
            t.cancel();
        }

    }
    //End of class

我希望这有帮助。

于 2013-10-31T07:39:42.910 回答