Question

我正在编写一个有服务的应用程序。这项服务应该做一些长时间运行的后台活动，比如获取Geo坐标。现在，我希望此服务在特定时间间隔之后通知应用程序某些事情要像警报一样完成。我对这部分感到困惑。我没有得到，如何让服务更新应用程序的某些操作，然后显示一些警报警报等。

以下是我的代码，

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();
}
 }

任何机构都能告诉我如何在特定时间间隔之后触发申请，例如在4小时后或50公里后显示通知

Answer 1

这是我在后台服务onStartCommand函数中编写的

      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

我希望这会有所帮助。

如何使用Service来通知后台的App

1 个答案: