无法在位置更改时获取当前位置 android

Posted 2023-04-14

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【中文标题】无法在位置更改时获取当前位置 android【英文标题】：Can't get current location android on location changed 【发布时间】：2016-08-16 22:59:40 【问题描述】：

我正在使用的 PC 和 android studio (macbook) 有什么问题。我尝试了不同的方法来获取当前位置，但每次我失败时，我都会按照不同的教程使用不同的程序来获取位置，但没有运气。我遵循this 教程，但它对我不起作用，但我下载了它工作正常的源代码，如果我创建新项目并尝试从示例项目添加文件它不起作用。我也试过this 和this 但没有运气。

我的安卓工作室有什么问题吗？请问我有什么解决办法。

我还更新了工具和 SDK。

我确实从here 尝试过这段代码

    package com.iorzb.gpstest;

import android.Manifest;
import android.app.AlertDialog;
import android.app.Service;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
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.support.v4.app.ActivityCompat;
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;
            if (isNetworkEnabled) 
                if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) 
                    // TODO: Consider calling
                    //    ActivityCompat#requestPermissions
                    // here to request the missing permissions, and then overriding
                    //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
                    //                                          int[] grantResults)
                    // to handle the case where the user grants the permission. See the documentation
                    // for ActivityCompat#requestPermissions for more details.
                    return null;
                
                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) 


@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;

相同的代码在下载的项目中有效，但在新项目中无效。

【问题讨论】：

考虑使用 Google 的 FusedLocationProvider。 developer.android.com/training/location/… ConnectionCallbacks、OnConnectionFailedListener 未知。它们来自外部图书馆吗？我已经添加了详细的答案。试试这个 -androprogrammer.com/2015/03/track-user-location-in-android.html 该示例代码（在问题中）非常糟糕。问题are explained in here。 Bhadresh 的回答和 androidnoobdev 的评论对此有一点改进，因为它们实际上实现了至关重要的 onLocationChanged() 方法。 【参考方案1】：

忘记你读过或做过的一切。使用 Google 的FusedLocationProviderApi。

这是侦听位置更新的最简单方法。

您不必处理启用了哪个位置提供商（网络、gps 等）。您只需要位置更新，所以使用FusedLocationProviderApi 轻松获取它们

它被描述为here。您可以在几分钟内将其实施到您的应用程序中。

Here 是示例。

注意：您需要以下依赖项：

compile 'com.google.android.gms:play-services:8.1.0'

【讨论】：

【参考方案2】：

我使用这个代码，这个代码完全适合我，请试试这个代码。并且，请检查手机并确保 GPS 已启用。

公共类 GPSTracker 扩展服务实现 LocationListener 私有最终上下文 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();

    System.out.println("onLocationChanged.." + latitude);
    System.out.println("onLocationChanged.." + longitude);


@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;

【讨论】：

我遵循您的代码，如果我注释掉 onLocationChanged 函数内部部分，它可以正常工作，否则它会崩溃你实现了 OnLocationChangedListener 吗？【参考方案3】：

你在用模拟器吗？如果是这样，除非您使用特定工具来模拟位置，否则位置功能将不起作用。或者您可以尝试使用物理设备测试您的应用。

【讨论】：

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