棒棒糖和棉花糖 gps 问题无法获取经度和纬度值，但在 21 以下的 api 上工作的代码相同

Question

我在堆栈溢出中遇到了很多问题 **但无法解决我的问题，这不是任何垃圾邮件问题**

大家好，我遇到了与纬度和经度值相关的问题

我能够在 Android 5.0 之前的所有 api 中获取值，但从 5.1 开始，我遇到了无法获取值的问题

这就是我正在使用的代码

我只添加了用于获取权限的代码

   if (ContextCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 1);

    } else {
        Toast.makeText(mContext, "You need have granted permission", Toast.LENGTH_SHORT).show();
        gps = new GPSTracker(mContext, MainActivity.this);

        // Check if GPS enabled
        if (gps.canGetLocation()) {

            getlatitude = gps.getLatitude();
            getlongitude = gps.getLongitude();

            // \n is for new line
            Toast.makeText(getApplicationContext(), "Your Location is - \nLat: " + getlatitude + "\nLong: " + getlongitude, Toast.LENGTH_LONG).show();
        } else {
            // Can't get location.
            // GPS or network is not enabled.
            // Ask user to enable GPS/network in settings.
            gps.showSettingsAlert();
        }
    }

然后

  @Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);

    switch (requestCode) {
        case 1: {
            // If request is cancelled, the result arrays are empty.
            if (grantResults.length > 0
                    && grantResults[0] == PackageManager.PERMISSION_GRANTED) {


                gps = new GPSTracker(mContext, MainActivity.this);

                // Check if GPS enabled
                if (gps.canGetLocation()) {

                    getlatitude = gps.getLatitude();
                    getlongitude = gps.getLongitude();

                    // \n is for new line
                    Toast.makeText(getApplicationContext(), "Your Location is - \nLat: " + getlatitude + "\nLong: " + getlongitude, Toast.LENGTH_LONG).show();
                } else {
                    // Can't get location.
                    // GPS or network is not enabled.
                    // Ask user to enable GPS/network in settings.
                    gps.showSettingsAlert();
                }

            } else {

                // permission denied, boo! Disable the
                // functionality that depends on this permission.

                Toast.makeText(mContext, "You need to grant permission", Toast.LENGTH_SHORT).show();
            }
            return;
        }
    }
}

但我还是得到了

Toast as Lat 0 Long 0

关于 gradle 的信息

我是面向 sdk 23 版本

在搜索了几个问题后，我知道我们需要获得这些值的许可才能在这方面明确地帮助我

清单文件

我已经添加了

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

还有 网络提供商权限

**

现在我已经根据下面的更改添加了新代码

**

    public class MainActivity extends Activity {



    Context context;

    double latitude_user,longitude_user;

    public static final int REQUEST_ID_MULTIPLE_PERMISSIONS = 1;

    String[] permissions= new String[]{
            Manifest.permission.ACCESS_COARSE_LOCATION,
            Manifest.permission.ACCESS_FINE_LOCATION};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        if (checkPermissions()) {

            GPSTracker gps;

            gps = new GPSTracker(context);

            latitude_user= gps.getLatitude();
            longitude_user  = gps.getLongitude();

            Toast.makeText(MainActivity.this, "Permission has been granted"+latitude_user+"  "+longitude_user, Toast.LENGTH_SHORT).show();

        }else{

            Toast.makeText(MainActivity.this, "Not granted", Toast.LENGTH_SHORT).show();

        }


    }


    private  boolean checkPermissions() {
        int result;
        List<String> listPermissionsNeeded = new ArrayList<>();
        for (String p:permissions) {
            result = ContextCompat.checkSelfPermission(getApplicationContext(),p);
            if (result != PackageManager.PERMISSION_GRANTED) {
                listPermissionsNeeded.add(p);
            }
        }
        if (!listPermissionsNeeded.isEmpty()) {
            ActivityCompat.requestPermissions(this, listPermissionsNeeded.toArray(new String[listPermissionsNeeded.size()]),REQUEST_ID_MULTIPLE_PERMISSIONS);
            return false;
        }
        return true;
    }
}

还有 GPSTracker.class

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) {
                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(){

}

/**
 * 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) {
    this.location = location;
    getLatitude();
    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;
}

}

Answer 1

首先您需要检查设备的操作系统版本然后获得许可，这意味着如果设备操作系统版本为 6.0 或更高版本，则需要动态获得许可，但低于此则不需要。请您还注意 GPS 位置是开/关，所以我建议您在获得许可后，您还可以动态检查 GPS 位置是否处于开/关状态。请使用它在我的应用程序中运行的这个，希望您也能得到答案

public class GettingPermission extends AppCompatActivity {

Activity activity;

public static final int REQUEST_ID_MULTIPLE_PERMISSIONS = 1;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    activity = GettingPermission.this;

    if (Build.VERSION.SDK_INT >=23)
    {
        getPermission();
    }
    else
    {
        startApp();
    }
}

private void startApp()
{
    Intent i = new Intent(activity, GetLatLog.class)
    activity.startActivity(i)
}



private void getPermission()
{
    if (ContextCompat.checkSelfPermission(activity, Manifest.permission.ACCESS_COARSE_LOCATION)
            + ContextCompat.checkSelfPermission(activity, Manifest.permission.ACCESS_FINE_LOCATION)         
            != PackageManager.PERMISSION_GRANTED) {

        Log.i("Permission is require first time", "...OK...getPermission() method!..if");
        ActivityCompat.requestPermissions(activity,
                new String[]{Manifest.permission.ACCESS_COARSE_LOCATION,
                        Manifest.permission.ACCESS_FINE_LOCATION},
                REQUEST_ID_MULTIPLE_PERMISSIONS);

    }
    else
    {
        Log.i("Permission is already granted ", "...Ok...getPermission() method!..else");
        startApp();
    }
}


@Override
public void onRequestPermissionsResult(final int requestCode, @NonNull final String[] permissions, @NonNull final int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    if (requestCode == REQUEST_PERMISSIONS) {
        if ((grantResults.length > 0) && (grantResults[0]+grantResults[1])
                == PackageManager.PERMISSION_GRANTED) {
            // Permission granted.

            Log.i("onRequestPermissionsResult()...","Permission granted");
            startApp();

        } else {
            // User refused to grant permission.
            Toast.makeText(StartActivity.this, "All Permission is required to use the Screen Recorder", Toast.LENGTH_LONG).show();
            getPermission();

        }
    }
}

}

GetLatLog.java 文件是

public class GetLatLog extends AppCompatActivity{

    Activity activity;

    private int ENABLE_LOCATION = 100;

    double latitude = 0.0, longitude = 0.0;

    private GPSTracker gps;
    ProgressDialog pd;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.temp);

        try
        {
            activity = GetLatLog.this;

            locationManager = (LocationManager) activity.getSystemService(Context.LOCATION_SERVICE);

            if (isLocationEnabled())
            {
                getLocation();
            }
            else
            {
                showSettingsAlert();
            }

        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }

    protected LocationManager locationManager;
    private boolean isLocationEnabled()
    {
        return locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER) ||
                locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
    }

    private void getLocation()
    {
        try
        {
            if (isLocationEnabled())
            {
                gps = new GPSTracker(activity);

                // check if GPS enabled
                if(gps.canGetLocation())
                {
                    latitude = gps.getLatitude();
                    longitude = gps.getLongitude();

                    Log.i("Location", ""+latitude + " : " + longitude);

                    if(latitude == 0.0 || longitude == 0.0)
                    {
                        retryGettingLocationDialog();
                    }
                    else
                    {
                        //startYour code here, You come here after getting lat and log.
                    }
                }
                else
                {
                    Toast.makeText(activity , "Location Not Enabled", Toast.LENGTH_LONG).show();
                }
            }
            else
            {
                Toast.makeText(activity , "GPS disabled. Cannot get location. Please enable it and try again!", Toast.LENGTH_LONG).show();
            }
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }

    public void showSettingsAlert()
    {

        Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
        activity.startActivityForResult(intent, ENABLE_LOCATION);

    }

    public void retryGettingLocationDialog()
    {
        retryGettingLocation();
    }

    private void retryGettingLocation()
    {
        try
        {
            new AsyncTask<Void, Void , Void>()
            {
                @Override
                protected void onPreExecute()
                {
                    try {
                        pd = new ProgressDialog(activity);
                        pd.setCancelable(false);
                        pd.setMessage("Please while we retry getting your location...");
                        pd.show();
                    } catch (Exception e) {
                        e.printStackTrace();
                    }

                    super.onPreExecute();
                }

                @Override
                protected Void doInBackground(Void... params)
                {
                    try
                    {
                        Thread.sleep(1500);
                    }
                    catch (InterruptedException e)
                    {
                        e.printStackTrace();
                    }

                    return null;
                }

                @Override
                protected void onPostExecute(Void aVoid)
                {
                    super.onPostExecute(aVoid);

                    if(pd != null)
                    {
                        pd.cancel();
                        pd.dismiss();
                        pd = null;
                    }

                    getLocation();
                }
            }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, (Void)null);
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }


    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data)
    {
        super.onActivityResult(requestCode, resultCode, data);

        try {
            //if (resultCode == Activity.RESULT_OK)
            {
                if(requestCode == ENABLE_LOCATION)
                {
                    if (isLocationEnabled())
                    {
                        getLocation();
                    }
                    else
                    {
                        showSettingsAlert();
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}