我创建了一个应用程序，它会在后台服务中定期将您的位置存储在数据库中，但是它没有获取位置。我的代码是......
public class LocationService extends Service {
private Double myLat, myLong;
private Location location;
private LocationManager locManager;
private LocationListener locationListener;
private boolean NETWORK_ENABLED, GPS_ENABLED, PASSIVE_ENABLED;
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onCreate() {
Toast.makeText(getApplicationContext(), "Service Created", Toast.LENGTH_LONG).show();
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
super.onStartCommand(intent, flags, startId);
myLat = 0.00;
myLong = 0.00;
locationListener = new LocationListener() {
@Override
public void onLocationChanged(Location location) {
LocationService.this.location = location;
LocationService.this.myLat = location.getLatitude();
LocationService.this.myLong = location.getLongitude();
Toast.makeText(getApplicationContext(), "onLocationChanged", Toast.LENGTH_LONG).show();
insertToDatabase();
}
@Override
public void onProviderDisabled(String provider) {}
@Override
public void onProviderEnabled(String provider) {}
@Override
public void onStatusChanged(String provider, int status,
Bundle extras) {}
};
getMyCurrentLocation();
}
private void getMyCurrentLocation() {
location = null;
locManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
NETWORK_ENABLED = false; GPS_ENABLED = false; PASSIVE_ENABLED = false;
NETWORK_ENABLED = locManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (NETWORK_ENABLED) {
Toast.makeText(getApplicationContext(), "Network Provider", Toast.LENGTH_LONG).show();
locManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 45 * 1000l, 1f, locationListener);
}
if (location == null) {
//setGPSOn();
GPS_ENABLED = locManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
if(GPS_ENABLED) {
Toast.makeText(getApplicationContext(), "GPS Provider", Toast.LENGTH_LONG).show();
locManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0l, 1f, locationListener);
}
//setGPSOff();
}
if (location == null) {
PASSIVE_ENABLED = locManager.isProviderEnabled(LocationManager.PASSIVE_PROVIDER);
if(PASSIVE_ENABLED) {
Toast.makeText(getApplicationContext(), "Passive Provider", Toast.LENGTH_LONG).show();
locManager.requestLocationUpdates(LocationManager.PASSIVE_PROVIDER, 0l, 1f, locationListener);
}
}
try {
location = locManager.getLastKnownLocation(locManager.getBestProvider(new Criteria(), true));
} catch(NullPointerException e) {}
if (location != null) {
myLat = location.getLatitude();
myLong = location.getLongitude();
insertToDatabase();
} else {
Location loc = null;
try {
loc = getLastKnownLocation(this);
} catch(NullPointerException e) {}
if (loc != null) {
myLat = loc.getLatitude();
myLong = loc.getLongitude();
insertToDatabase();
}
}
locManager.removeUpdates(locationListener);
}
private Location getLastKnownLocation(Context context) {
Location location = null;
LocationManager locationmanager = (LocationManager)context.getSystemService("location");
List<?> list = locationmanager.getAllProviders();
boolean i = false;
Iterator<?> iterator = list.iterator();
do {
if(!iterator.hasNext())
break;
String s = (String)iterator.next();
if(i != false && !locationmanager.isProviderEnabled(s))
continue;
Location location1 = locationmanager.getLastKnownLocation(s);
if(location1 == null)
continue;
else {
float f = location.getAccuracy();
float f1 = location1.getAccuracy();
if(f >= f1) {
long l = location1.getTime();
long l1 = location.getTime();
if(l - l1 <= 600000L)
continue;
}
}
location = location1;
i = locationmanager.isProviderEnabled(s);
} while (true);
return location;
}
}
这并没有给我任何位置....我的应用也没有崩溃或给出任何异常。
我已在Manifest文件中正确注册所有权限... ACCESS_COARSE_LOCATION ACCESS_FINE_LOCATION
我无法找到该怎么做？ 任何帮助将不胜感激 提前感谢帮助...
答案 0 :(得分：3)
//Use this class in your project:
package com.example.location;
import android.app.AlertDialog;
import android.app.Service;
import android.content.Context;
import android.content.DialogInterface;
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.provider.Settings;
import android.util.Log;
public class LocationTracker extends Service implements LocationListener {
private final Context mContext;
// flag for GPS status
boolean isGPSEnabled = false;
// flag for network status
boolean isNetworkEnabled = false;
// flag for GPS status
boolean canGetLocation = false;
Location location; // location
double latitude; // latitude
double longitude; // longitude
// The minimum distance to change Updates in meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters
// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute
// Declaring a Location Manager
protected LocationManager locationManager;
public LocationTracker(Context context) {
this.mContext = context;
getLocation();
}
public Location getLocation() {
try {
locationManager = (LocationManager) mContext
.getSystemService(LOCATION_SERVICE);
// getting GPS status
isGPSEnabled = locationManager
.isProviderEnabled(LocationManager.GPS_PROVIDER);
// getting network status
isNetworkEnabled = locationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!isGPSEnabled && !isNetworkEnabled) {
// no network provider is enabled
} else {
this.canGetLocation = true;
if (isNetworkEnabled) {
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("Network", "Network");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
// if GPS Enabled get lat/long using GPS Services
if (isGPSEnabled) {
if (location == null) {
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("GPS Enabled", "GPS Enabled");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
Log.i("Error", e.getMessage());
}
return location;
}
/**
* Stop using GPS listener
* Calling this function will stop using GPS in your app
* */
public void stopUsingGPS(){
if(locationManager != null){
locationManager.removeUpdates(LocationTracker.this);
}
}
/**
* Function to get latitude
* */
public double getLatitude(){
if(location != null){
latitude = location.getLatitude();
}
return latitude;
}
/**
* Function to get longitude
* */
public double getLongitude(){
if(location != null){
longitude = location.getLongitude();
}
return longitude;
}
/**
* Function to check GPS/wifi enabled
* @return boolean
* */
public boolean canGetLocation() {
return this.canGetLocation;
}
@Override
public void onLocationChanged(Location location) {
}
@Override
public void onProviderDisabled(String provider) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public IBinder onBind(Intent arg0) {
return null;
}
}
//and in your main class(Activity), call this class as follows :
double latitude = 0.0, longitude = 0.0;
Geocoder geocoder = new Geocoder(this,Locale.getDefault());
LocationTracker locationTracker = new LocationTracker(this);
if(locationTracker.canGetLocation()) {
latitude = locationTracker.getLatitude();
longitude = locationTracker.getLongitude();
Log.i("LocationTracker", "LatLong: " + latitude + ", " + longitude);
try{
List<Address> addresses = geocoder.getFromLocation(latitude, longitude, 1);
if (addresses.size() > 0) {
String address = addresses.get(0).getAddressLine(0);
String city = addresses.get(0).getAddressLine(1);
String country = addresses.get(0).getAddressLine(2);
String completeAddress = address + ", " + city + ", "+country;
Log.i("Complete Address", completeAddress);
}
}
catch (Exception e){
Log.i("Error", e.getMessage());
Toast.makeText(getApplicationContext(), e.getMessage(), Toast.LENGTH_SHORT).show();
}
}
else {
Log.i("LocationTracker", "Unable to get location");
}
// Make sure to include following permissions in your manifest file:
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.INTERNET"/>
答案 1 :(得分：1)
我认为您的问题是您立即删除了侦听器：
locManager.removeUpdates(locationListener); // comment this one out
在getMyCurrentLocation();
你应该尝试在其他地方删除你的听众。