从应用启用gps后，提示如何刷新并获取当前位置? [英] After enable gps from an app prompt how to refresh and get the current location?

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本文介绍了从应用启用gps后，提示如何刷新并获取当前位置?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我目前正在开发一个Android应用程序，如果未开启，它会提示用户启用GPS，为此我使用了警告对话框".在通过设置启用GPS并通过按后退"按钮返回到我的应用后，吐司消息显示为0.00,0.00.尽管如果在运行应用程序之前打开GPS，但该应用程序会正确显示我的位置.我想知道启用GPS目的后该刷新用户位置所使用的方法.任何相关的文章都会有帮助.

I am currently developing an Android app which prompts the user to enable GPS if it's not on and I have used Alert Dialog for this purpose. After I enable the GPS from settings and come back to my app by pressing back button, the toast message display 0.00,0.00. Although If I have my GPS on before running the app, the app properly displays my location. I want to know to which method to use for this refresh user location after enabling GPS purpose. Any relevant article would really help.

这是我的GPS课

          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;
}

}

推荐答案

尝试，这也是我面临的问题.

Try this I am also facing the problem.

  • 您必须reload your activity

在那之后，您可以获得location

After that, you can get location

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;
         }
        }

  • 在您内MainActivity.java执行此操作

    • In you MainActivity.java do this

      • @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(); 
          }
        }

      这篇关于从应用启用gps后，提示如何刷新并获取当前位置?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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