我正在尝试获取我的Android手机的当前位置并在祝酒词中显示经度和纬度。这是我写的一个函数。在调试代码时，我发现控件永远不会进入onLocationChanged函数。
从下面的android文档看起来，当我调用“locationMgr.requestLocationUpdates”时，它应该调用onLocationChanged上的回调函数。但在我的代码中似乎没有发生这种情况。 http://developer.android.com/training/basics/location/currentlocation.html
我检查了手机是否打开了GPS。我无法弄清楚以下代码中的错误。请帮忙。
public void getCurrentLocation(){
LocationManager locationMgr;
locationMgr = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
LocationListener listener = new LocationListener() {
@Override
public void onLocationChanged(Location location) {
// A new location update is received. Do something useful with it
String latitude = "latitude: " + location.getLatitude();
String longitude = "longitude: " + location.getLongitude();
String toastString = "location is" + latitude + "," +longitude;
Toast.makeText( getApplicationContext(),toastString,Toast.LENGTH_SHORT).show();
}
@Override
public void onProviderDisabled(String provider) {
// No code here
}
@Override
public void onProviderEnabled(String provider) {
// No code here
}
@Override
public void onStatusChanged(String provider, int status,Bundle extras)
{
// No code here
}
};
locationMgr.requestLocationUpdates(LocationManager.GPS_PROVIDER,0, 0, listener);
}
我的Manifest文件中还有两行。
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
感谢您的帮助。
我正在使用Eclipse而我的手机（操作系统：Thuderbolt）的API级别为15，目标为4.0.4。
答案 0 :(得分：1)
尝试Android GPS, Location Manager Tutorial代码。本教程也解决了我的位置跟踪问题。
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 GPSTracker 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 GPSTracker(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;
// First get location from Network Provider
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();
}
return location;
}
/**
* Stop using GPS listener
* Calling this function will stop using GPS in your app
* */
public void stopUsingGPS(){
if(locationManager != null){
locationManager.removeUpdates(GPSTracker.this);
}
}
/**
* Function to get latitude
* */
public double getLatitude(){
if(location != null){
latitude = location.getLatitude();
}
// return latitude
return latitude;
}
/**
* Function to get longitude
* */
public double getLongitude(){
if(location != null){
longitude = location.getLongitude();
}
// return longitude
return longitude;
}
/**
* Function to check GPS/wifi enabled
* @return boolean
* */
public boolean canGetLocation() {
return this.canGetLocation;
}
/**
* Function to show settings alert dialog
* On pressing Settings button will lauch Settings Options
* */
public void showSettingsAlert(){
AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);
// Setting Dialog Title
alertDialog.setTitle("GPS is settings");
// Setting Dialog Message
alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");
// On pressing Settings button
alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int which) {
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
mContext.startActivity(intent);
}
});
// on pressing cancel button
alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
// Showing Alert Message
alertDialog.show();
}
@Override
public void onLocationChanged(Location location) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
@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;
}
}
每当您需要更新位置时，只需致电
即可gpsTracker.getLocation();
答案 1 :(得分：1)
问题是google-play-services库。 我不得不下载库代码并在eclipse中编译它。然后我在项目中添加了库的路径。这解决了这个问题。 之前我在我的项目中包含了google-play-services .jar文件，但它没有用。不知道为什么。
答案 2 :(得分：0)
以下是我编写的示例，它使用LocationManager每两分钟获取一次位置数据。它不完美，但应足以解决您的问题：可以找到它here 专注于：
@Override
public void onLocationChanged(final Location location) {
this.location=location;
final Handler handler = new Handler();
Timer ourtimer = new Timer();
TimerTask timerTask = new TimerTask() {
int cnt=1;
public void run() {
handler.post(new Runnable() {
public void run() {
Double latitude = location.getLatitude();
Double longitude = location.getLongitude();
Double altitude = location.getAltitude();
Float accuracy = location.getAccuracy();
textView.setText("Latitude: " + latitude + "\n" + "Longitude: " + longitude+ "\n" + "Altitude: " + altitude + "\n" + "Accuracy: " + accuracy + "meters"+"\n" + "Location Counter: " + cnt);
try {
jsonData = new JSONObject();
jsonData.put("Latitude", latitude);
jsonData.put("Longitude", longitude);
jsonData.put("Altitude", altitude);
jsonData.put("Accuracy", accuracy);
System.out.println(jsonData.toString()); //not required, for testing only
if(url!=null) {
new HttpPostHandler().execute();
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
cnt++;
}
});
}};
ourtimer.schedule(timerTask, 0, 120000);
答案 3 :(得分：0)
有几个原因导致您无法获得位置。
1。）如果您想在模拟器上获取位置。然后你必须使用DDMS手动推动坐标。
2。）如果您在设备上检查它，但仍然没有获得位置。然后正如你所说，你期待它来自GPS。然后你应该有清晰的天空视图来获得它。由于GPS接收器不能在屋顶下或在某些阻碍下工作。他们必须有天空视野。
3。）你可以使用wi-fi或cell-tower获得位置。如果位置准确性不那么重要，您也可以选择最后已知的位置。
我认为可能是第二点可以解决您的问题。