Java 无法获取当前位置

我需要获取当前设备位置（lat/lng），但“getCurrentLocation（）”始终显示“无提供程序”，因此位置为空。我在onCreate（）中调用此方法，并在清单文件中声明了所有权限：

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.INTERNET" />

我怎样才能修好它

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我修改了很多类似的问题，但找不到合适的解决方案。

首先考虑使用FooDealPosivices提供程序代替LooCuffor。您可以找到如何使用id的指南

第二，你试图得到“最后一个已知的位置”，但它并不总是在那里。要接收用户位置，您需要订阅LocationManager更新。这是一个如何做到这一点的例子

public class GPSTracker extends Service implements LocationListener {

private final Activity 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

public static final int MY_PERMISSIONS_REQUEST_LOCATION = 99;

// 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(Activity 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
            checkLocationPermission();
            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){
        checkLocationPermission();
        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("Please enable GPS to get locations.");

    // 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) {
}

@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;
}

public boolean checkLocationPermission()
{
    if (ContextCompat.checkSelfPermission(mContext, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED)
    {
        // Should we show an explanation?
        if (ActivityCompat.shouldShowRequestPermissionRationale(mContext, android.Manifest.permission.ACCESS_FINE_LOCATION))
        {
            // Show an expanation to the user *asynchronously* -- don't block
            // this thread waiting for the user's response! After the user
            // sees the explanation, try again to request the permission.

            //Prompt the user once explanation has been shown
            ActivityCompat.requestPermissions(mContext, new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION},
                    MY_PERMISSIONS_REQUEST_LOCATION);
        }
        else
        {
            // No explanation needed, we can request the permission.
            ActivityCompat.requestPermissions(mContext, new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION},
                    MY_PERMISSIONS_REQUEST_LOCATION);
        }
        return false;
    }
    else
    {
        if (!locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER))
        {
            showGPSDisabledAlertToUser();
        }

        return true;
    }
}

private void showGPSDisabledAlertToUser()
{
    AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(mContext);
    alertDialogBuilder.setMessage("GPS is disabled in your device. Would you like to enable it?")
            .setCancelable(false)
            .setPositiveButton("Settings", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    Intent callGPSSettingIntent = new Intent(android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                    mContext.startActivity(callGPSSettingIntent);
                }
            });
    alertDialogBuilder.setNegativeButton("Cancel", new DialogInterface.OnClickListener()
    {
        public void onClick(DialogInterface dialog, int id)
        {
            dialog.cancel();
        }
    });
    AlertDialog alert = alertDialogBuilder.create();
    alert.show();
}

}

尝试此代码，无论何时需要获取位置，都可以创建GPS对象并检索lat和long

例如：

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在代码中尝试此更改不保证

.getLastKnownLocation（）

返回以前存储的位置数据

它可以返回一个

null

因此，您必须为需要监听位置更新的情况做好准备。您可以这样向他们注册：

    locationManager
            .requestLocationUpdates(provider, 0, 0, 
                    new LocationListener() {
                        @Override
                        public void onLocationChanged(Location location) {
                            //here you receive the new location
                        }

                        @Override
                        public void onStatusChanged(String s, int i, Bundle bundle) {

                        }

                        @Override
                        public void onProviderEnabled(String s) {

                        }

                        @Override
                        public void onProviderDisabled(String s) {

                        }
                    }););

---

您已经评论了有关权限的部分，您是否至少使用设置授予了权限？（Android 5.0及之前版本）何时更新

位置

<代码>公共void onLocation已更改（位置）{未实现。我不认为这是使用侦听器仅获取一个位置的最佳解决方案。从您自己的项目中复制粘贴一卡车代码并不是一个好的答案。这根本无法回答问题。我使用完全相同的代码来获取纬度和长度，但您无法回答我？所以我猜您不会“我不理解它……老实说，它比它应该的要长得多。如果你只有GPS，这将不起作用，因为你需要在

请求位置更新

和收到的第一个位置之间留出一段时间。此外，你至少应该在某处呼叫

停止使用GPS

，因为在你的示例中，GPS保持启用状态。要接收用户，请您需要订阅的LocationManager更新不正确。仅当您需要时updates@TimCastelijns如果您没有收到最后已知的位置，那么订阅是唯一的选择。

GPSTracker gpsTracker = new GPSTracker(activity);
            Latitude = gpsTracker.getLatitude();
            Longtude = gpsTracker.getLongitude();

 provider = locationManager.getBestProvider(c, true);

    locationManager
            .requestLocationUpdates(provider, 0, 0, 
                    new LocationListener() {
                        @Override
                        public void onLocationChanged(Location location) {
                            //here you receive the new location
                        }

                        @Override
                        public void onStatusChanged(String s, int i, Bundle bundle) {

                        }

                        @Override
                        public void onProviderEnabled(String s) {

                        }

                        @Override
                        public void onProviderDisabled(String s) {

                        }
                    }););