Breiten- und Längengrad wird nicht angezeigt

Question

Ich möchte Breitengrad und Längengrad des aktuellen Standorts anzeigen und den Namen des Standorts von diesem Längen- und Breitengrad dieses Ortes in drei Textansichten anzeigen. Der Längen- und Breitengrad wird jedoch nicht in tv_lat und tv_long angezeigt.

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

Im Fall, wenn Sie Ihre Anwendung in Eibisch testen:

public class MainActivity extends AppCompatActivity implements NetworkCallback, LocationListener { 

private EditText empIdTxt; 
private EditText passwordTxt; 
private TextView tv_lat; 
private TextView tv_long; 
private TextView tv_place; 
private Button loginBtn; 
protected Location mLastLocation; 
LocationManager locationmanager; 

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

    empIdTxt = (EditText) findViewById(R.id.et_loginId); 
    passwordTxt = (EditText) findViewById(R.id.et_loginPass); 
    tv_lat = (TextView) findViewById(R.id.tv_lat); 
    tv_long = (TextView) findViewById(R.id.tv_long); 
    tv_place = (TextView) findViewById(R.id.tv_place); 
    loginBtn = (Button) findViewById(R.id.bt_login); 

    empIdTxt.addTextChangedListener(new MyTextWatcher(empIdTxt)); 
    passwordTxt.addTextChangedListener(new MyTextWatcher(passwordTxt)); 

    empIdTxt.setText("vinay"); 
    passwordTxt.setText("qwerty"); 

    locationmanager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); 
    Criteria cri = new Criteria(); 
    String provider = locationmanager.getBestProvider(cri, false); 
    if (provider != null & !provider.equals("")) { 
     Location location = locationmanager.getLastKnownLocation(provider); 
     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; 
     } 
     locationmanager.requestLocationUpdates(provider, 2000, 1, this); 
     if(location!=null) { 
      onLocationChanged(location); 
     }else{ 
      Toast.makeText(getApplicationContext(),"location not found",Toast.LENGTH_LONG).show(); 
     } 
    }else{ 
     Toast.makeText(getApplicationContext(),"Provider is null",Toast.LENGTH_LONG).show(); 
    } 
} 

public void clickLogin(View v) { 
    if (!validateEmpID()) { 
     return; 
    } 
    if (!validatePassword()) { 
     return; 
    } 

    LoginApi api = new LoginApi(this, this); 
    api.processLogin(empIdTxt.getText().toString(), passwordTxt.getText().toString(), 
      mLastLocation.getLatitude()+"",mLastLocation.getLongitude()+"", 
      AlertDialogManager.todayDate(), new GPSTracker(MainActivity.this).getLocation()+""); 
} 

private void requestFocus(View view) { 
    if (view.requestFocus()) { 
     getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE); 
    } 
} 
private boolean validateEmpID() { 
    if (empIdTxt.getText().toString().trim().isEmpty()) { 
     empIdTxt.setError(ErrorUtil.USERNAME_ERROR); 
     requestFocus(empIdTxt); 
     return false; 
    } 
    return true; 
} 

private boolean validatePassword() { 
    if (passwordTxt.getText().toString().trim().isEmpty()) { 
     passwordTxt.setError(ErrorUtil.PASSWORD_ERROR); 
     requestFocus(passwordTxt); 
     return false; 
    } 
    return true; 
} 

private class MyTextWatcher implements TextWatcher { 

    private View view; 

    private MyTextWatcher(View view) { 
     this.view = view; 
    } 

    public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) { 
    } 

    public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) { 
    } 

    public void afterTextChanged(Editable editable) { 
     switch (view.getId()) { 
      case R.id.et_loginId: 
       validateEmpID(); 
       break; 
      case R.id.et_loginPass: 
       validatePassword(); 
       break; 
     } 
    } 
} 

@Override 
public void updateScreen(String data, String tag) { 

    if (tag.compareTo(ApiUtil.TAG_LOGIN) == 0) { 
     try { 
      System.out.println("Login Response"+data); 

      JSONObject mainObj = new JSONObject(data); 
      AppDelegate ctrl = AppDelegate.getInstance(); 

      if (!mainObj.isNull("username")) { 
       ctrl.username = mainObj.getString("username"); 
      } 
      if (!mainObj.isNull("password")) { 
       ctrl.password = mainObj.getString("password"); 
      } 

    /*   if (!mainObj.isNull("latitude")) { 
       ctrl.password = mainObj.getString("latitude"); 
      } 

      if (!mainObj.isNull("longitude")) { 
       ctrl.password = mainObj.getString("longitude"); 
      } 

      if (!mainObj.isNull("date_and_time")) { 
       ctrl.password = mainObj.getString("date_and_time"); 
      } 

      if (!mainObj.isNull("place")) { 
       ctrl.password = mainObj.getString("place"); 
      }*/ 

      if (!mainObj.isNull("error")) { 
       Toast.makeText(MainActivity.this,"Login Fails",Toast.LENGTH_SHORT).show(); 
      } else { 
       Toast.makeText(MainActivity.this,"Login Success",Toast.LENGTH_SHORT).show(); 
      } 


     } catch (Exception e) { 
      Toast.makeText(MainActivity.this,"Seems there is an issue please try again later",Toast.LENGTH_SHORT).show(); 

     } 
    } 

} 

@Override 

public void onLocationChanged(Location location) { 

    tv_lat.setText("Latitude"+location.getLatitude()); 
    tv_long.setText("Longitude"+ location.getLongitude()); 
} 

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

@Override 
public void onProviderEnabled(String s) { 
} 

@Override 
public void onProviderDisabled(String s) { 
} 
} 

Answer 1

Achten Sie darauf, diese Erlaubnis in manifest & GPS gegeben haben sollte eingeschaltet werden

Give Berechtigungen programmatisch.

Letzte Sache entfernen Sie diese Bedingung aus Ihrem Code und führen Sie es aus. Es wird auf jeden Fall funktionieren:

diese entfernen:

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; 
     } 

Wenn Sie es nicht funktioniert, ich meine eigene Klasse schreiben, die auf Lollipop überprüfen es perfekt funktioniert:

public class Google_Map_Current_Location extends FragmentActivity implements LocationListener { 
    GoogleMap googleMap; 
    Location location; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     //show error dialog if GoolglePlayServices not available 
     if (!isGooglePlayServicesAvailable()) { 
      finish(); 
     } 
     setContentView(R.layout.google_map_current_loction); 
     SupportMapFragment supportMapFragment = 
       (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.googleMap); 
     googleMap = supportMapFragment.getMap(); 
     try { 
      googleMap.setMyLocationEnabled(true); 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
     LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE); 
     if (!locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) { 
      showSettingsAlert(); 
     } 

     Criteria criteria = new Criteria(); 
     String bestProvider = locationManager.getBestProvider(criteria, true); 
     try { 
      location = locationManager.getLastKnownLocation(bestProvider); 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
     if (location != null) { 
      onLocationChanged(location); 
     } 
     try { 
      locationManager.requestLocationUpdates(bestProvider, 20000, 0, this); 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
    } 

    @Override 
    public void onLocationChanged(Location location) { 
     TextView locationTv = (TextView) findViewById(R.id.latlongLocation); 
     double latitude = location.getLatitude(); 
     double longitude = location.getLongitude(); 
     LatLng latLng = new LatLng(latitude, longitude); 
     googleMap.addMarker(new MarkerOptions().position(latLng)); 
     googleMap.moveCamera(CameraUpdateFactory.newLatLng(latLng)); 
     googleMap.animateCamera(CameraUpdateFactory.zoomTo(15)); 
     locationTv.setText("Latitude:" + latitude + ", Longitude:" + longitude); 

    } 

    @Override 
    public void onProviderDisabled(String provider) { 
     // TODO Auto-generated method stub 
    } 

    @Override 
    public void onProviderEnabled(String provider) { 
     // TODO Auto-generated method stub 
    } 

    @Override 
    public void onStatusChanged(String provider, int status, Bundle extras) { 
     // TODO Auto-generated method stub 
    } 

    private boolean isGooglePlayServicesAvailable() { 
     int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this); 
     if (ConnectionResult.SUCCESS == status) { 
      return true; 
     } else { 
      GooglePlayServicesUtil.getErrorDialog(status, this, 0).show(); 
      return false; 
     } 
    } 

    public void showSettingsAlert() { 
     AlertDialog.Builder alertDialog = new AlertDialog.Builder(this); 

     // 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); 
       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(); 
    }