Geçerli konum, Android'de ayrı sınıf kullanarak nasıl edinilir

Question

Etkin konumda değil, ayrı bir sınıf kullanarak geçerli konum almam gerekiyor. Bu benim kodum ve çalışmıyor. Herkes bunu düzeltmek için bir fikrim var. Bu konum konum bilgilerini almaya çalıştığımda her zaman çöküyor.

package com.example.ishanfx.departmentapp.network; 

import android.content.Context; 
import android.location.Criteria; 
import android.location.Location; 
import android.location.LocationListener; 
import android.location.LocationManager; 
import android.os.Bundle; 

import com.google.android.gms.common.ConnectionResult; 
import com.google.android.gms.common.api.GoogleApiClient; 
import com.google.android.gms.location.LocationRequest; 
import com.google.android.gms.location.LocationServices; 


public class LocationHandler implements LocationListener,GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener { 
    private LocationManager locationManager; 
    Location mLastLocation; 
    LocationRequest mLocationRequest; 
    private String latitude; 
    private String longitude; 
    Context context; 
    private static GoogleApiClient mGoogleApiClient; 

    public LocationHandler(Context context) { 
     this.context = context; 
     locationManager = (LocationManager) context 
       .getSystemService(Context.LOCATION_SERVICE); 
     buildGoogleApiClient(); 


    } 
    protected synchronized void buildGoogleApiClient() { 
     mGoogleApiClient = new GoogleApiClient.Builder(context) 
       .addConnectionCallbacks(this) 
       .addOnConnectionFailedListener(this) 
       .addApi(LocationServices.API) 
       .build(); 
     mGoogleApiClient.connect(); 

    } 
    private void setMostRecentLocation(Location lastKnownLocation) { 

    } 

    public String getLatitude() { 
     return latitude; 
    } 

    public String getLongitude() { 
     return longitude; 
    } 


    @Override 
    public void onLocationChanged(Location location) { 
     double lon = (double) (location.getLongitude()); 
     double lat = (double) (location.getLatitude()); 

     latitude = lat + ""; 
     longitude = lon + ""; 

    } 

    /* 
    * (non-Javadoc) 
    * 
    * @see 
    * android.location.LocationListener#onProviderDisabled(java.lang.String) 
    */ 
    @Override 
    public void onProviderDisabled(String arg0) { 
     // TODO Auto-generated method stub 

    } 

    /* 
    * (non-Javadoc) 
    * 
    * @see 
    * android.location.LocationListener#onProviderEnabled(java.lang.String) 
    */ 
    @Override 
    public void onProviderEnabled(String arg0) { 
     // TODO Auto-generated method stub 

    } 


    @Override 
    public void onStatusChanged(String arg0, int arg1, Bundle arg2) { 
     // TODO Auto-generated method stub 

    } 

    @Override 
    public void onConnected(Bundle bundle) { 
     mLastLocation = LocationServices.FusedLocationApi.getLastLocation(
       mGoogleApiClient); 
     if (mLastLocation != null) { 
      latitude =String.valueOf(mLastLocation.getLatitude()); 
      longitude = String.valueOf(mLastLocation.getLongitude()); 
     } 

    } 

    @Override 
    public void onConnectionSuspended(int i) { 

    } 

    @Override 
    public void onConnectionFailed(ConnectionResult connectionResult) { 

    } 
} 

Bu mainActivity'dir. Bu uygulamayı çağırdığımda kilitlenir.

LocationHandler appLocationManager = new LocationHandler(HomeActivity.this); 

       Toast.makeText(getApplicationContext(), appLocationManager.getLatitude().toString(), Toast.LENGTH_SHORT).show(); 
       Toast.makeText(getApplicationContext(), appLocationManager.getLongitude().toString(), Toast.LENGTH_SHORT).show(); 

Bu

Bu onConnected olayı için biraz zaman alır Günlüğü

FATAL EXCEPTION: main 
                       java.lang.NullPointerException 
                        at com.example.ishanfx.departmentapp.HomeActivity.onOptionsItemSelected(HomeActivity.java:172) 
                        at android.app.Activity.onMenuItemSelected(Activity.java:2502) 
                        at android.support.v4.app.FragmentActivity.onMenuItemSelected(FragmentActivity.java:361) 
                        at android.support.v7.app.AppCompatActivity.onMenuItemSelected(AppCompatActivity.java:147) 
                        at android.support.v7.view.WindowCallbackWrapper.onMenuItemSelected(WindowCallbackWrapper.java:100) 
                        at android.support.v7.view.WindowCallbackWrapper.onMenuItemSelected(WindowCallbackWrapper.java:100) 
                        at android.support.v7.app.ToolbarActionBar$2.onMenuItemClick(ToolbarActionBar.java:68) 
                        at android.support.v7.widget.Toolbar$1.onMenuItemClick(Toolbar.java:172) 
                        at android.support.v7.widget.ActionMenuView$MenuBuilderCallback.onMenuItemSelected(ActionMenuView.java:760) 
                        at android.support.v7.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:811) 
                        at android.support.v7.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:152) 
                        at android.support.v7.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:958) 
                        at android.support.v7.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:948) 
                        at android.support.v7.view.menu.MenuPopupHelper.onItemClick(MenuPopupHelper.java:191) 
                        at android.widget.AdapterView.performItemClick(AdapterView.java:292) 
                        at android.widget.AbsListView.performItemClick(AbsListView.java:1065) 
                        at android.widget.AbsListView$PerformClick.run(AbsListView.java:2522) 
                        at android.widget.AbsListView$1.run(AbsListView.java:3183) 
                        at android.os.Handler.handleCallback(Handler.java:605) 
                        at android.os.Handler.dispatchMessage(Handler.java:92) 
                        at android.os.Looper.loop(Looper.java:137) 
                        at android.app.ActivityThread.main(ActivityThread.java:4441) 
                        at java.lang.reflect.Method.invokeNative(Native Method) 
                        at java.lang.reflect.Method.invoke(Method.java:511) 
                        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
                        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
                        at dalvik.system.NativeStart.main(Native Method) 

Answer 1

olduğunu. Tostlarınızı yapmadan önce biraz zaman vermelisiniz. Öyle gibi LocationHandler sınıfa bir IsConnected özellik eklersiniz:

private boolean isconnected = false; 

public boolean isConnected() { 
    return isconnected; 
} 

@Override 
public void onConnected(Bundle bundle) { 
    mLastLocation = LocationServices.FusedLocationApi.getLastLocation(
      mGoogleApiClient); 
    if (mLastLocation != null) { 
     latitude =String.valueOf(mLastLocation.getLatitude()); 
     longitude = String.valueOf(mLastLocation.getLongitude()); 
    } 
    this.isconnected = true; 
} 

Sonra MainActivity

LocationHandler appLocationManager = new LocationHandler(HomeActivity.this); 

while(!appLocationManager.isConnected()) { 
// wait for a bit 
} 

if (appLocationManager.isConnected()) { 
    Toast.makeText(getApplicationContext(), appLocationManager.getLatitude().toString(), Toast.LENGTH_SHORT).show(); 
    Toast.makeText(getApplicationContext(), appLocationManager.getLongitude().toString(), Toast.LENGTH_SHORT).show(); 
} 

Answer 2

ben temiz bir şekilde sınıfa yukarıda güncelledik.

public class LocationHandler implements LocationListener, 
     GoogleApiClient.ConnectionCallbacks, 
     GoogleApiClient.OnConnectionFailedListener { 
    private Context mContext; 
    private GoogleApiClient mGoogleApiClient; 
    private LocationRequest mLocationRequest; 
    private OnLocationUpdateListener onLocationUpdateListener; 

    public LocationHandler(Context mContext) { 
     this.mContext = mContext; 
     buildGoogleApiClient(); 
     createLocationRequest(); 
    } 

    protected synchronized void buildGoogleApiClient() { 
     mGoogleApiClient = new GoogleApiClient.Builder(mContext) 
       .addConnectionCallbacks(this) 
       .addOnConnectionFailedListener(this) 
       .addApi(LocationServices.API) 
       .build(); 
     mGoogleApiClient.connect(); 
    } 

    public void startLocationUpdates(Context mContext) { 
     if (ActivityCompat.checkSelfPermission(mContext, 
       Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED 
       && ActivityCompat.checkSelfPermission(mContext, 
       Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) { 
      return; 
     } 
     LocationServices.FusedLocationApi.requestLocationUpdates(
       mGoogleApiClient, mLocationRequest, this); 
    } 

    private void stopLocationUpdate(Context mContext) { 
     LocationServices.FusedLocationApi.removeLocationUpdates(
       mGoogleApiClient, this); 
    } 

    //other new Methods but not using right now.. 
    protected void createLocationRequest() { 
     mLocationRequest = new LocationRequest(); 
     mLocationRequest.setInterval(10000);//set the interval in which you want to get locations 
     mLocationRequest.setFastestInterval(5000);//if a location is available sooner you can get it (i.e. another app is using the location services) 
     mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY); 
    } 

    @Override 
    public void onConnected(@Nullable Bundle bundle) { 
     startLocationUpdates(mContext); 
    } 

    @Override 
    public void onConnectionSuspended(int i) { 
    } 

    @Override 
    public void onConnectionFailed(@NonNull ConnectionResult connectionResult) { 
    } 

    @Override 
    public void onLocationChanged(Location location) { 
     if(mGoogleApiClient.isConnected() && onLocationUpdateListener != null){ 
      onLocationUpdateListener.onLocationChange(location); 
     } 
    } 

    public void setOnLocationUpdateListener(OnLocationUpdateListener onLocationUpdateListener) { 
     this.onLocationUpdateListener = onLocationUpdateListener; 
    } 
} 

OnLocationUpdateListener

public interface OnLocationUpdateListener { 
    void onLocationChange(Location location); 
    void onError(EnumUtil.ErrorType errorType); 
}