从应用提示启用gps后如何刷新并获取当前位置？

Question

我目前正在开发一个Android应用程序，提示用户启用GPS，如果它没有打开，我已经使用警报对话框来实现此目的。我从设置启用GPS并通过按返回按钮返回到我的应用程序后，Toast消息显示0.00,0.00。虽然如果我在运行应用程序之前打开GPS，应用程序会正确显示我的位置。我想知道在启用GPS目的后用于此刷新用户位置的方法。任何相关的文章都会有所帮助。

这是我的gps课程

          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 {
            if (ActivityCompat.checkSelfPermission(mContext, 
             Manifest.permission.ACCESS_FINE_LOCATION) != 
                PackageManager.PERMISSION_GRANTED
                    && ActivityCompat.checkSelfPermission(mContext, 
                       Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {

                return null;
            }
            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) {
                    if (ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
                            && ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {

                        return 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){
        if (ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
                && ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {

            return ;
        }
        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;
}

}

Answer 1

试试这个我也面临着这个问题。

你必须reload your activity
之后，你可以得到location
在boolean采取gps tracker class
如果你想要qazxsw poi qazxsw poi，请确保qazxsw poi。

alert is in try catch to avoid crash

在你enable or disable这样做

Gps

Happy to help you :)

Answer 2

启用GPS后，使用以下代码获取当前位置;

public class GpsTracker extends Service implements LocationListener {

private final Context mContext;

 public static boolean isFromSetting=false;
// 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 {
        if (ActivityCompat.checkSelfPermission(mContext, 
    Manifest.permission.ACCESS_FINE_LOCATION) != 
      PackageManager.PERMISSION_GRANTED
                && ActivityCompat.checkSelfPermission(mContext, 
  Manifest.permission.ACCESS_COARSE_LOCATION) != 
   PackageManager.PERMISSION_GRANTED) {

            return null;
        }
        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) {
                if (ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
                        && ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {

                    return 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){
    if (ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
            && ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {

        return ;
    }
    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(){
         try{
         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);
             isFromSetting = true;
            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();
       }catch(Exception e){e.printstacktrace}
      }

      @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;
         }
        }

Answer 3

你可以使用一些时间间隔的线程或服务，并在该线程或服务中获得lat。像这样的事。

MainActivity.java

Answer 4

通过使用恢复标志返回活动后尝试重新创建活动然后在oncreate（）中使用延迟，这对我来说很好。在返回活动后创建我使用下面的代码。

@Override
protected void onResume() {
    super.onResume();
  if (GPSTracker.isFromSetting==true){
            finish();
            startActivity(getIntent());
            GPSTracker.isFromSetting=false;
        }
     }
       @Override
        public void onBackPressed() {
          super.onBackPressed();
         if (GPSTracker.isFromSetting==true){
           finish();
            startActivity(getIntent());
            GPSTracker.isFromSetting=false;
           }
          }
      @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
       gps = new GPSTracker(LoginActivity.this);

    if(gps.canGetLocation()){

        double latitude = gps.getLatitude();
        double longitude = gps.getLongitude();

        Log.e("55",""+latitude);
        Log.e("56",""+longitude);
        Toast.makeText(getApplicationContext(), "Your Location is - \nLat: "                   
        + latitude + "\nLong: " + longitude, Toast.LENGTH_LONG).show();
         }else{

            gps.showSettingsAlert(); 
          }
        }

Answer 5

另一种更好的方法是使用广播监听器public class MainActivity extends AppCompatActivity implements LocationListener, GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, OnMapReadyCallback { final String TAG = "GPS"; GoogleMap googleMap; Marker mCurrLocationMarker; private long UPDATE_INTERVAL = 2 * 1000; /* 10 secs */ private long FASTEST_INTERVAL = 2000; /* 2 sec */ static final int MY_PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION = 1; private static final int GPS_CHECK = 112; GoogleApiClient gac; LocationRequest locationRequest; TextView tvLatitude, tvLongitude, tvTime; LocationManager locationManager; Button capture; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); tvLatitude = (TextView) findViewById(R.id.tvLatitude); tvLongitude = (TextView) findViewById(R.id.tvLongitude); tvTime = (TextView) findViewById(R.id.tvTime); capture = (Button) findViewById(R.id.capture); isGooglePlayServicesAvailable(); // if (!isLocationEnabled()) // showAlert(); locationManager = (LocationManager) getSystemService(LOCATION_SERVICE); if (!locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) { showAlert(); } locationRequest = new LocationRequest(); locationRequest.setInterval(UPDATE_INTERVAL); locationRequest.setFastestInterval(FASTEST_INTERVAL); locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY); gac = new GoogleApiClient.Builder(this) .addConnectionCallbacks(this) .addOnConnectionFailedListener(this) .addApi(LocationServices.API) .build(); SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager() .findFragmentById(R.id.map); mapFragment.getMapAsync(this); } @Override protected void onStart() { gac.connect(); super.onStart(); } @Override protected void onStop() { gac.disconnect(); super.onStop(); } @Override public void onLocationChanged(Location location) { if (location != null) { updateUI(location); } } @Override public void onConnected(@Nullable Bundle bundle) { if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) { ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, MY_PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION); return; } Log.d(TAG, "onConnected"); Location ll = LocationServices.FusedLocationApi.getLastLocation(gac); Log.d(TAG, "LastLocation: " + (ll == null ? "NO LastLocation" : ll.toString())); updateUI(ll); LocationServices.FusedLocationApi.requestLocationUpdates(gac, locationRequest, this); } @Override public void onRequestPermissionsResult( int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { switch (requestCode) { case MY_PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION: { // If request is cancelled, the result arrays are empty. if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) { Toast.makeText(MainActivity.this, "Permission was granted!", Toast.LENGTH_LONG).show(); try { LocationServices.FusedLocationApi.requestLocationUpdates( gac, locationRequest, this); } catch (SecurityException e) { Toast.makeText(MainActivity.this, "SecurityException:\n" + e.toString(), Toast.LENGTH_LONG).show(); } } else { Toast.makeText(MainActivity.this, "Permission denied!", Toast.LENGTH_LONG).show(); } return; } } } @Override public void onConnectionSuspended(int i) { } @Override public void onConnectionFailed(@NonNull ConnectionResult connectionResult) { Toast.makeText(MainActivity.this, "onConnectionFailed: \n" + connectionResult.toString(), Toast.LENGTH_LONG).show(); Log.d("DDD", connectionResult.toString()); } private void updateUI(Location loc) { Log.d(TAG, "updateUI"); try { tvLatitude.setText(Double.toString(loc.getLatitude())); tvLongitude.setText(Double.toString(loc.getLongitude())); tvTime.setText(DateFormat.getTimeInstance().format(loc.getTime())); double lattitude = loc.getLatitude(); double longitude = loc.getLongitude(); //Place current location marker LatLng latLng = new LatLng(lattitude, longitude); if(mCurrLocationMarker!=null){ mCurrLocationMarker.setPosition(latLng); }else{ mCurrLocationMarker = googleMap.addMarker(new MarkerOptions() .position(latLng) .icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED)) .title("I am here")); } googleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(latLng, 18)); googleMap.getUiSettings().setZoomControlsEnabled(true); } catch (Exception e) { } } private boolean isLocationEnabled() { LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); return locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER) || locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER); } private boolean isGooglePlayServicesAvailable() { final int PLAY_SERVICES_RESOLUTION_REQUEST = 9000; GoogleApiAvailability apiAvailability = GoogleApiAvailability.getInstance(); int resultCode = apiAvailability.isGooglePlayServicesAvailable(this); if (resultCode != ConnectionResult.SUCCESS) { if (apiAvailability.isUserResolvableError(resultCode)) { apiAvailability.getErrorDialog(this, resultCode, PLAY_SERVICES_RESOLUTION_REQUEST) .show(); } else { Log.d(TAG, "This device is not supported."); finish(); } return false; } Log.d(TAG, "This device is supported."); return true; } private void showAlert() { final AlertDialog.Builder dialog = new AlertDialog.Builder(this); dialog.setTitle("Enable Location") .setMessage("Your Locations Settings is set to 'Off'.\nPlease Enable Location to " + "use this app") .setPositiveButton("Location Settings", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface paramDialogInterface, int paramInt) { startActivityForResult(new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS), GPS_CHECK); } }) .setNegativeButton("Cancel", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface paramDialogInterface, int paramInt) { } }); dialog.show(); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if (requestCode == GPS_CHECK) { if (!locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) { capture.setVisibility(View.GONE); Toast.makeText(getApplicationContext(), "Please turn on gps...", Toast.LENGTH_SHORT).show(); Log.e("BBBBBBBBBBBBBBB", ""); } else { gac.connect(); googleMap.setOnMyLocationButtonClickListener(new GoogleMap.OnMyLocationButtonClickListener() { @Override public boolean onMyLocationButtonClick() { try { Location myLocation = googleMap.getMyLocation(); onLocationChanged(myLocation); } catch (Exception e) { Log.getStackTraceString(e); } return false; } }); } } } @Override public void onMapReady(GoogleMap map) { googleMap = map; map.setMapType(GoogleMap.MAP_TYPE_NORMAL); 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; } map.setMyLocationEnabled(true); map.setTrafficEnabled(true); map.setIndoorEnabled(true); map.setBuildingsEnabled(true); map.getUiSettings().setZoomControlsEnabled(true); } }。看看，让我知道。

从应用提示启用gps后如何刷新并获取当前位置？

问题描述投票：3回答：5

5个回答

Happy to help you :)

最新问题

从应用提示启用gps后如何刷新并获取当前位置？

问题描述 投票：3回答：5

5个回答

Happy to help you :)

最新问题

问题描述投票：3回答：5