如何使用 Target API 23 及更高版本通过 GPS 获取用户位置

Posted 2023-04-14

【中文标题】如何使用 Target API 23 及更高版本通过 GPS 获取用户位置

【英文标题】：How to get users Location through GPS with Target API 23 and higher

【发布时间】：2017-05-26 22:24:09

【问题描述】：

我正在尝试在我的项目中实现一个 GPStracker，我想用它来获取用户的 lat、long 和 post 代码。我正在关注本教程； http://www.androidhive.info/2012/07/android-gps-location-manager-tutorial/，但是，我似乎无法使代码正常工作，经过数小时的尝试和研究，我不确定我应该做什么。我对 Android 还很陌生，所以我可能犯了一个愚蠢的错误。

当我按照发布的网站上显示的指南进行操作时，我在代码中收到一条错误消息：

Call requires permission which may be rejected by user: code should explicitly check to see if permission is available (with `checkPermission`) or explicitly handle a potential `SecurityException`

就行了：

            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();
                        
                    
                
            
        

和

public void stopUsingGPS()
    if(locationManager != null)
        locationManager.removeUpdates(GPSTracker.this);
    

我正在使用 API 25，处理片段并在线搜索，这似乎是 API 23 及更高版本的问题。许多其他人发布了类似的问题，但是当我尝试为他们提供的答案时，我仍然无法让它发挥作用；例如，

我尝试实现：

if (checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
        && checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) 
    return;

我假设授予 Android 之后的权限，但它仍然不起作用。如果有一种您认为更好的获取用户位置的新方法，请指导我。

我的项目中还包含以下权限：

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

【问题讨论】：

那个教程是四年半的时间。在 Android 年代，这几乎是永远的。坚持使用较新的教育材料（理想情况下，不到两年）。 FWIW，here is a sample app demonstrating getting the location while also employing runtime permissions.

:) 说的对。会记住这一点，谢谢。感谢您的链接

【参考方案1】：

如果您的应用面向 api 23 或更高版本，则需要在运行时请求 Location 权限。

将此代码添加到您的活动中：

public static final int MY_PERMISSIONS_REQUEST_LOCATION = 99;
private void checkLocationPermission() 
    if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
            != PackageManager.PERMISSION_GRANTED) 

        // Should we show an explanation?
        if (ActivityCompat.shouldShowRequestPermissionRationale(this,
                Manifest.permission.ACCESS_FINE_LOCATION)) 

            // Show an explanation 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.
            new AlertDialog.Builder(this)
                    .setTitle("Location Permission Needed")
                    .setMessage("This app needs the Location permission, please accept to use location functionality")
                    .setPositiveButton("OK", new DialogInterface.OnClickListener() 
                        @Override
                        public void onClick(DialogInterface dialogInterface, int i) 
                            //Prompt the user once explanation has been shown
                            ActivityCompat.requestPermissions(MapLocationActivity.this,
                                    new String[]Manifest.permission.ACCESS_FINE_LOCATION,
                                    MY_PERMISSIONS_REQUEST_LOCATION );
                        
                    )
                    .create()
                    .show();


         else 
            // No explanation needed, we can request the permission.
            ActivityCompat.requestPermissions(this,
                    new String[]Manifest.permission.ACCESS_FINE_LOCATION,
                    MY_PERMISSIONS_REQUEST_LOCATION );
        
    


@Override
public void onRequestPermissionsResult(int requestCode,
                                       String permissions[], int[] grantResults) 
    switch (requestCode) 
        case MY_PERMISSIONS_REQUEST_LOCATION: 
            // If request is cancelled, the result arrays are empty.
            if (grantResults.length > 0
                    && grantResults[0] == PackageManager.PERMISSION_GRANTED) 

                // permission was granted, yay! Do the
                // location-related task you need to do.
                if (ContextCompat.checkSelfPermission(this,
                        Manifest.permission.ACCESS_FINE_LOCATION)
                        == PackageManager.PERMISSION_GRANTED) 

                     //Permission was granted, do your thing!
                

             else 

                // permission denied, boo! Disable the
                // functionality that depends on this permission.
                Toast.makeText(this, "permission denied", Toast.LENGTH_LONG).show();
            
            return;
        

        // other 'case' lines to check for other
        // permissions this app might request
    

然后，只需在 Activity 的onCreate() 中调用checkLocationPermission()。

【讨论】：

我是否需要将它与教程中的其他代码一起包含在内，还是单独使用？

此代码仅请求位置权限。授权后怎么做，就看你自己了！ （基本上，保留您现有的代码，并将其添加到它旁边）

定位权限后是否开启GPS？

@KomalGupta 此答案中的代码严格用于请求您的应用程序的权限。要提示用户启用 GPS，请参阅此答案：***.com/questions/31235564/…