android - Android - 每 x 分钟更新一次位置

Question

我对android很陌生，这是我在这里的第一篇文章，所以请善待！:-)

我正在尝试创建一个在后台运行并每 x 分钟更新一次位置的服务。要每 x 分钟运行一次，我使用的是 AlarmManager，如下所述：Alarm Manager Example

这是我所拥有的：

package com.example.service1;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.PowerManager;
import android.util.Log;

public class Scheduler extends BroadcastReceiver{

LocationManager locationManager;
LocationListener locationListener;


@Override
public void onReceive(Context context, Intent intent) {
    // TODO Auto-generated method stub
    PowerManager pm = (PowerManager)context.getSystemService(Context.POWER_SERVICE);
    PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "");
    wl.acquire();




    //Code which is executed every X seconds/minutes

    getLocation(context);

    //End of Code
    wl.release();

}

public void setScheduler(Context context) {
    AlarmManager am = (AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
    Intent i = new Intent(context, Scheduler.class);
    PendingIntent pi = PendingIntent.getBroadcast(context, 0, i, 0);
    am.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), 1000 * 20, pi);

}


//Method to get the Location

public void getLocation(Context context) {

    Log.e("null","getLocation");
    locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);

    locationListener = new LocationListener() {

        @Override
        public void onLocationChanged(Location location) {
            // TODO Auto-generated method stub
            Log.e(null, "location change");
            makeUseOfLocation(location);
        }

        @Override
        public void onProviderDisabled(String provider) {
            // TODO Auto-generated method stub

        }

        @Override
        public void onProviderEnabled(String provider) {
            // TODO Auto-generated method stub

        }

        @Override
        public void onStatusChanged(String provider, int status,
                Bundle extras) {
            // TODO Auto-generated method stub

        }

    };

}

//Method to work with the location Data; Instance of Point is created
public void makeUseOfLocation(Location location) {
    Log.e(null,"makeuse");

    Log.e(null,location.getLatitude() + "");
}

}

getLocation()每 20 秒调用一次，但它永远不会运行onLocationChanged()（我使用 Eclipse 中的 EmulatorControl 来更改位置）。

我之前使用.ScheduledExecutorService而不是AlarmManager.

谁能帮我？

Answer 1

Looking at your code I never see the call to locationManager.requestLocationUpdates() with your listener as an argument.

This means that your listener is never registered with the location manager, and therefore does not get called.

You probably only want to register one listener, instead of registering a new one every time.

Answer 2

尝试这个..

 protected void updateNotification() {
         LocationManager lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
         LocationListener locationListener = new MyLocationlistener();

         lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, normallocationwait, 0.250f, locationListener);
         location = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
   }

   private class MyLocationlistener implements LocationListener {

     public void onLocationChanged(Location location){
         if(location!=null){
             if(location.hasAccuracy()){
                   dumpLocation(location);
             }else{
                   dumpLocation(location);
            }
         } 
     }

     public void onProviderDisabled(String provider){
         Log.v("Loc Update","\nProvider disabled: " + provider);
     }

     public void onProviderEnabled(String provider){
         Log.v("Loc Update","\nProvider enabled: " + provider);
     }

     public void onStatusChanged(String provider, int status, Bundle extras){
         Log.v("Loc Update","\nProvider status changed: " + provider + ", status="
                    + status + ", extras=" + extras);
     }