Question

我尝试使用LocationManager来获取用户当前位置但似乎永远不会调用onLocationChanged。

这是我的代码

public void checkLocationService(){
    LocationManager lm = (LocationManager)MapsActivity.this.getSystemService(Context.LOCATION_SERVICE);
    boolean gps_enabled = false;
    boolean network_enabled = false;

    try {
        gps_enabled = lm.isProviderEnabled(LocationManager.GPS_PROVIDER);
    } catch(Exception ex) {
        ex.printStackTrace();
    }

    try {
        network_enabled = lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
    } catch(Exception ex) {
        ex.printStackTrace();
    }

    if(!gps_enabled && !network_enabled) {
        // notify user
        AlertDialog.Builder dialog = new AlertDialog.Builder(MapsActivity.this);
        dialog.setTitle("Perhatian");
        dialog.setMessage("Anda harus mengaktifkan GPS pada perangkat anda untuk dapat menggunakan semua fitur yang ada. Aktifkan GPS?");
        dialog.setPositiveButton("Pengaturan", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface paramDialogInterface, int paramInt) {
                // TODO Auto-generated method stub
                Intent myIntent = new Intent( Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                MapsActivity.this.startActivity(myIntent);
            }
        });
        dialog.setNegativeButton("Batal", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface paramDialogInterface, int paramInt) {
                // TODO Auto-generated method stub

            }
        });
        dialog.show();
    }

    if (gps_enabled) {
        try {
            lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
        } catch (SecurityException e) {

        }

        if (lm != null)  {
            try {
                lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
            } catch (SecurityException e) {

            }
        }
    }
    if (network_enabled) {
        try {
            lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, this);
        } catch (SecurityException e) {

        }

        if (lm != null)  {
            try {
                lm.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
            } catch (SecurityException e) {

            }
        }
    }

}

这里是onLocationChanged

@Override
public void onLocationChanged(Location l) {
    pointLatitude = l.getLatitude();
    pointLongitude = l.getLongitude();

    //Fetching username from shared preferences
    SharedPreferences sharedPreferences = getSharedPreferences(Config.SHARED_PREF_NAME, Context.MODE_PRIVATE);
    final String username = sharedPreferences.getString(Config.USERNAME_SHARED_PREF, "Tidak tersedia");

    final ProgressDialog loading = ProgressDialog.show(this, "Login...", "Mohon tunggu...", true, false);
    //Creating a string request
    StringRequest stringRequest = new StringRequest(Request.Method.POST, Config.GET_LOCATION_URL,
            new Response.Listener<String>() {
                @Override
                public void onResponse(String response) {
                    loading.dismiss();
                }
            },
            new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    //You can handle error here if you want
                    //Toast.makeText(LoginActivity.this,error.toString(),Toast.LENGTH_LONG ).show();
                    loading.dismiss();
                }
            }){
        @Override
        protected Map<String, String> getParams() throws AuthFailureError {
            Map<String,String> params = new HashMap<>();
            //Adding parameters to request
            params.put(Config.KEY_USERNAME, username);
            params.put(Config.KEY_LATITUDE, String.valueOf(pointLatitude));
            params.put(Config.KEY_LONGITUDE, String.valueOf(pointLongitude));

            //returning parameter
            return params;
        }
    };

    //Adding the string request to the queue
    RequestQueue requestQueue = Volley.newRequestQueue(this);
    requestQueue.add(stringRequest);
}

这里有什么问题？提前谢谢。

Answer 1

first check below permission is required.


<uses-permission android:name="android.permission.ACCESS_GPS" />
<uses-permission android:name="android.permission.ACCESS_LOCATION" />
<uses-permissionandroid:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.INTERNET" /> 


Then please check that your class need to extend LocationListener

public class MyLocationListener implements LocationListener {
@Override
  public void onLocationChanged(Location arg0) {
    latitude = arg0.getLatitude();
    longitude = arg0.getLongitude();
  }

}

永远不会调用onLocationChanged - Android

1 个答案: