安卓系统-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，所以请友善！：-）

我正在尝试创建一个在后台运行的服务，每x分钟更新一次位置。为了每x分钟运行一次，我使用AlarmManager，如下所述：Alarm Manager示例

这是我得到的：

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，但它从不运行onLocationChanged()（我使用Eclipse中的EmulatorControl来更改位置）。

我以前使用ScheduledExecutorService而不是AlarmManager时也遇到过同样的问题。

有人能帮我吗？

Answer 1

查看您的代码，我从未看到以侦听器为参数调用locationManager.requestLocationUpdates（）。

这意味着您的侦听器从未向位置管理器注册，因此不会被调用。

您可能只想注册一个侦听器，而不是每次都注册一个新的侦听器。

Answer 2

试试这个。。

 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);
     }