如何在应用程序关闭时禁用Android LocationListener

Question

我有一个类来处理名为MyLocationManager.java的位置服务

这是代码:

package com.syariati.childzone;

import java.util.List;
import java.util.Locale;
import android.content.Context;
import android.location.Address;
import android.location.Criteria;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.widget.Toast;

public class MyLocationManager {

    private Context context;
    private double myLat = 0.0;
    private double myLon = 0.0;
    private LocationManager locationManager = null;
    private Location location = null;
    private Criteria criteria;
    private String locationName = null;

    public MyLocationManager(Context ctx) {
        this.context = ctx;
    }

    private String setCriteria() {
        this.criteria = new Criteria();
        this.criteria.setAccuracy(Criteria.ACCURACY_FINE);
        this.criteria.setAltitudeRequired(false);
        this.criteria.setBearingRequired(false);
        this.criteria.setCostAllowed(true);
        this.criteria.setPowerRequirement(Criteria.POWER_LOW);
        return locationManager.getBestProvider(criteria, true);
    }

    public double getMyLatitude() {
        return this.myLat;
    }

    public double getMyLongitude() {
        return this.myLon;
    }

    public String getLocation() {
        return this.locationName;
    }

    public void onLocationUpdate() {
        locationManager = (LocationManager) context
                .getSystemService(Context.LOCATION_SERVICE);
        String provider = setCriteria();

        location = locationManager.getLastKnownLocation(provider);
        updateWithNewLocation(location);
        locationManager.requestLocationUpdates(provider, 1000, 0,
                new MyLocationListener());

    }

    private void updateWithNewLocation(Location location) {
        if (location != null) {
            this.myLat = location.getLatitude();
            this.myLon = location.getLongitude();
//          Toast.makeText(this.context,
//                  "Lokasi Anda:\n" + this.myLat + "\n" + this.myLon,
//                  Toast.LENGTH_LONG).show();
            getLocationName(this.myLat, this.myLon);
        } else {
            Toast.makeText(this.context, "Lokasi Anda Tidak Diketahui",
                    Toast.LENGTH_SHORT).show();
        }
    }

    private void getLocationName(double lat, double lon) {
        Geocoder geocoder = new Geocoder(context, Locale.getDefault());
        try {
            List<Address> adresses = geocoder.getFromLocation(lat, lon, 1);
            StringBuilder sb = new StringBuilder();
            if (adresses.size() > 0) {
                Address address = adresses.get(0);
                for (int i = 0; i < address.getMaxAddressLineIndex(); i++)
                    sb.append(address.getAddressLine(i)).append("\n");
                sb.append(address.getCountryName()).append("\n");
            }
            this.locationName = sb.toString();
//          Toast.makeText(context, sb.toString(), Toast.LENGTH_LONG).show();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private class MyLocationListener implements LocationListener {

        @Override
        public void onLocationChanged(Location newLocation) {
            // TODO Auto-generated method stub
            myLat = newLocation.getLatitude();
            myLon = newLocation.getLongitude();
            getLocationName(myLat, myLon);
            Toast.makeText(context,
                    "Lokasi terupdate\nLat: " + myLat + "\nLon: " + myLon,
                    Toast.LENGTH_SHORT).show();
        }

        @Override
        public void onProviderDisabled(String arg0) {
            // TODO Auto-generated method stub
        }

        @Override
        public void onProviderEnabled(String arg0) {
            // TODO Auto-generated method stub
        }

        @Override
        public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
            // TODO Auto-generated method stub
        }

    }

}

它有一个Inner类,可以在其上实现位置监听器.到目前为止,它的确有效.它听取位置没有问题.但是,当我退出我的应用程序时,它并没有完全停止侦听位置.从这段代码中可以看出:

@Override
            public void onLocationChanged(Location newLocation) {
                // TODO Auto-generated method stub
                myLat = newLocation.getLatitude();
                myLon = newLocation.getLongitude();
                getLocationName(myLat, myLon);
                Toast.makeText(context,
                        "Lokasi terupdate\nLat: " + myLat + "\nLon: " + myLon,
                        Toast.LENGTH_SHORT).show();
            }

当位置更新时,将显示toast,并且在更新位置时仍会显示.即使我已经关闭了应用程序.

如何在我的情况下完全停止位置监听器.

这个帮我阻止了更新:

android如何停止gps

Answer 1

您可以在LocationManager上调用removeUpdates.

public void removeUpdates(PendingIntent intent)

使用给定的PendingIntent删除当前活动的位置更新的任何当前注册.在此调用之后,此意图将不再发生更新.

参数:

不再需要位置更新的intent {#link PendingIntent}对象

抛出:

如果intent为null,则为IllegalArgumentException

请参阅此处:http://developer.android.com/reference/android/location/LocationManager.html#removeUpdates(android.app.PendingIntent)

更新:

在这种情况下,您可以更改此行:

locationManager.requestLocationUpdates(provider, 1000, 0,
                new MyLocationListener());

至:

MyLocationListener myLL = new MyLocationListener();
locationManager.requestLocationUpdates(provider, 1000, 0,
                myLL);

如果要删除侦听器调用,请执行以下操作:

locationManager.removeUpdates(myLL);