Question

我写了一个GPSDataCollectService来每10秒收集一次位置数据，但它没有报告我的HTC手机中的位置，有什么不对吗？有人可以帮帮我吗？

package com.android.example;

import java.util.Calendar;
import java.util.Timer;
import java.util.TimerTask;

import android.app.Service;
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.IBinder;
import android.util.Log;

public class GPSDataCollectorService extends Service {

    private static final String TAG = GPSDataCollectorService.class
            .getSimpleName();

    LocationManager locationManager;
    LocationListener gpsLocationListener;

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

    private Timer timer;

    private TimerTask collectTask = new TimerTask() {
        @Override
        public void run() {
            Log.i(TAG, "Timer task doing work: "
                    + Calendar.getInstance().getTimeInMillis());
            locationManager = (LocationManager)  getSystemService(Context.LOCATION_SERVICE);
            gpsLocationListener = new GPSLocationListener();
            locationManager.requestLocationUpdates(
                    LocationManager.GPS_PROVIDER, 10 * 1000L, 0,
                    gpsLocationListener);
        }
    };

    @Override
    public void onCreate() {
        super.onCreate();
        Log.i(TAG, "Service creating");
        timer = new Timer("GPSDataCollectorTimer");
        timer.schedule(collectTask, 1000L, 10 * 1000L);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.i(TAG, "Service destroying");
        locationManager.removeUpdates(gpsLocationListener);
        timer.cancel();
        timer = null;
    }

    private class GPSLocationListener implements LocationListener {

        @Override
        public void onLocationChanged(Location location) {
            Log.d(TAG, "onLocationChanged: " + location.toString());
            locationManager.removeUpdates(gpsLocationListener);
        }

        @Override
        public void onStatusChanged(String provider, int status, Bundle extras) {
            Log.d(TAG, "onStatusChanged: " + status);
        }

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

        }

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

        }

    }

}

Answer 1

如果您的位置每10秒更改一次，那么只有您的LocationManager会跟踪新位置。否则它将使用相同的最后已知位置。

Answer 2

您可能希望在TimerTask中使用Timer，而不是使用LocationListener，也许您可以这样做：

LocationManager lm = yourActivityReference.getSystemService(Context.LOCATION_SERVICE);
String provider = lm.getBestProvider(new Criteria(),true);
Location loc = lm.getLastKnownLocation (provider);

我没有检查过，但如果我这样做，我就会知道......

问候。

EDIt：让我再试一次“经典”方法。

public class GPSDataCollectorService extends Service {

    private static final String TAG = GPSDataCollectorService.class
            .getSimpleName();

    LocationManager locationManager;
    LocationListener gpsLocationListener;

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


    @Override
    public void onCreate() {
        super.onCreate();
        locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
        gpsLocationListener = new GPSLocationListener();
        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 10 * 1000L, 0, gpsLocationListener);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.i(TAG, "Service destroying");
        locationManager.removeUpdates(gpsLocationListener);
    }

    private class GPSLocationListener implements LocationListener {

        @Override
        public void onLocationChanged(Location location) {
            Log.d(TAG, "onLocationChanged: " + location.toString());
        }

        @Override
        public void onStatusChanged(String provider, int status, Bundle extras) {
            Log.d(TAG, "onStatusChanged: " + status);
        }

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

        }

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

        }

    }

}

我认为您不需要任何Timer，因为位置更新会异步调用您的侦听器，您可以设置超时。我在Android中没有玩过很多GPS，但是必须有很多例子。

Answer 3

可以使用minTime参数控制位置更新间隔。位置更新之间的经过时间永远不会小于minTime，尽管它可能会更多，这取决于Location Provider的实现

使用

 LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
 locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 20 * 1000, 0, this);

更多详细信息，请参见Location Manager

如何在Android中每10秒收集一次位置数据

3 个答案: