Question

我在堆栈溢出中遇到了很多问题但是无法解决我的问题而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

我能够在所有api中获取值直到Android 5.0但是从5.1我面临问题我无法获取值

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

我定位sdk 23 版

在搜索了几个问题之后我才知道我们需要获得这些价值的许可才能在这方面明显帮助我

清单文件

我添加了

 <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;
    }
}

和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

首先你需要检查设备的操作系统版本，然后你获得许可，意味着如果设备操作系统版本是6.0或更高版本，那么需要动态获得权限，但在此之下它不是必需的。请你也注意GPS位置是开/关的，所以我建议你在获得许可后还可以动态检查GPS位置是开/关。请使用这个在我的应用程序中工作，我希望你也得到你的答案

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();
        }
    }
}

棒棒糖和棉花糖gps问题无法获取经度和纬度值，但相同的代码工作在21以下的api

1 个答案: