在Android Studio应用中获取当前位置 [英] Getting current location in Android Studio app

问题描述

我正在开发我的第一个Android应用程序，它应该获得android设备的纬度和经度，并通过Web服务将其发送到模板文档。

我按照从 http://developer.android.com/training/location/retrieve-current.html 。

这是我的.java类中的代码：

  import android.content.Context; 
导入android.content.DialogInterface; 
导入android.content.Intent; 
导入android.location.Location; 
导入android.location.LocationManager; 
导入android.os.Bundle; 
导入android.provider.Settings; 
导入android.support.v7.app.AlertDialog; 
导入android.support.v7.app.AppCompatActivity; 
导入android.view.View; 
导入android.widget.EditText; 
 import com.google.android.gms.common.ConnectionResult; 
 import com.google.android.gms.common.api.GoogleApiClient; 
 import com.google.android.gms.location.LocationServices; 
 
 public class GetLocation extends AppCompatActivity implements GoogleApiClient.ConnectionCallbacks，GoogleApiClient.OnConnectionFailedListener {
 private GoogleApiClient mGoogleApiClient; 
 EditText textLat; 
 EditText textLong; 
 EditText lat; 
 EditText lon; 
 
保护无效onCreate（Bundle savedInstanceState）{
 super.onCreate（savedInstanceState）; 
 setContentView（R.layout.get_location）; 
 
 textLat =（EditText）findViewById（R.id.latitude）; 
 textLong =（EditText）findViewById（R.id.longitude）; 
 
 mGoogleApiClient = new GoogleApiClient.Builder（this）
 .addConnectionCallbacks（this）
 .addOnConnectionFailedListener（this）
 .addApi（LocationServices.API）
 。建立（）; 
} 
 
 private boolean isGPSEnabled（）{
 LocationManager cm =（LocationManager）getSystemService（Context.LOCATION_SERVICE）; 
返回cm.isProviderEnabled（LocationManager.GPS_PROVIDER）; 
} 
 
 @Override 
 public void onConnected（Bundle bundle）{
 Location mLastLocation = LocationServices.FusedLocationApi.getLastLocation（mGoogleApiClient）; 
 if（mLastLocation！= null）{
 lat.setText（String.valueOf（mLastLocation.getLatitude（）））; 
 lon.setText（String.valueOf（mLastLocation.getLongitude（）））; 
 
 
 
 @Override 
 public void onConnectionSuspended（int i）{
 
} 
 
 @覆盖
 public void onConnectionFailed（ConnectionResult connectionResult）{
 
} 
 
 public void onButtonClick（View v）{
 if（v.getId（）= =.Rid.getGpsLocation）{
 if（！isGPSEnabled（））{
新AlertDialog.Builder（this）
 .setMessage（请激活您的GPS定位！）
 .setCancelable（false）
 .setPositiveButton（Settings，new DialogInterface.OnClickListener（）{
 public void onClick（DialogInterface对话框，int id）{
 Intent i = new Intent（Settings .ACTION_LOCATION_SOURCE_SETTINGS）; 
 startActivity（i）; 
} 
}）
。 setNegativeButton（Cancel，null）
 .show（）; 
} else {
 textLat.setText（String.valueOf（lat））; 
 textLong.setText（String.valueOf（lon））; 
} 
 
} 
} 
 
 
} 
  

我没有得到任何错误，但是当我点击应该获取坐标的按钮时，我在两个视图中都会获得'null'文本。 p>

我还包含了互联网的权限，访问精细和粗略的位置。

解决方案

您需要定义LocationListener。

  public class MainActivity extends Activity implements LocationListener {
 protected LocationManager locationManager; 
 protected LocationListener locationListener; 
保护上下文上下文; 
 TextView txtLat; 
字符串拉特; 
字符串提供程序; 
保护字符串纬度，经度; 
 protected boolean gps_enabled，network_enabled; 
 
 @Override 
 protected void onCreate（Bundle savedInstanceState）{
 super.onCreate（savedInstanceState）; 
 setContentView（R.layout.activity_main）; 
 txtLat =（TextView）findViewById（R.id.textview1）; 
 
 locationManager =（LocationManager）getSystemService（Context.LOCATION_SERVICE）; 
 locationManager.requestLocationUpdates（LocationManager.GPS_PROVIDER，0，0，this）; 
} 
 @Override 
 public void onLocationChanged（Location location）{
 txtLat =（TextView）findViewById（R.id.textview1）; 
 txtLat.setText（Latitude：+ location.getLatitude（）+，Longitude：+ location.getLongitude（））; 
} 
 
 @Override 
 public void onProviderDisabled（String provider）{
 Log.d（Latitude，disable）; 
} 
 
 @Override 
 public void onProviderEnabled（String provider）{
 Log.d（Latitude，enable）; 
 
 $ b @Override 
 public void onStatusChanged（String provider，int status，Bundle extras）{
 Log.d（Latitude，status）; 
} 
} 
  

并且需要给予以下权限：

ACCESS_COARSE_LOCATION ：当我们为我们的Android应用程序使用网络位置提供程序时，会使用它。 强> ACCESS_FINE_LOCATION ：它为这两个提供商提供许可。

$ b 互联网：权限是必须为网络提供商使用。

I am developing my first Android app which should get the latitude and longitude of an android device and send it via a web service to a template document.

I followed the guide of getting the location from http://developer.android.com/training/location/retrieve-current.html.

This is the code from my .java class:

import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.location.Location;
import android.location.LocationManager;
import android.os.Bundle;
import android.provider.Settings;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.EditText;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationServices;

public class GetLocation extends AppCompatActivity implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {
    private GoogleApiClient mGoogleApiClient;
    EditText textLat;
    EditText textLong;
    EditText lat;
    EditText lon;

    protected void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.get_location);

        textLat = (EditText) findViewById(R.id.latitude);
        textLong = (EditText) findViewById(R.id.longitude);

        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API)
                .build();
    }

    private boolean isGPSEnabled() {
        LocationManager cm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
        return cm.isProviderEnabled(LocationManager.GPS_PROVIDER);
    }

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

    @Override
    public void onConnectionSuspended(int i) {

    }

    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {

    }

    public void onButtonClick(View v){
        if(v.getId() == R.id.getGpsLocation){
            if(!isGPSEnabled()){
                new AlertDialog.Builder(this)
                        .setMessage("Please activate your GPS Location!")
                        .setCancelable(false)
                        .setPositiveButton("Settings", new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int id) {
                                Intent i = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                                startActivity(i);
                            }
                        })
                        .setNegativeButton("Cancel", null)
                        .show();
            } else {
                textLat.setText(String.valueOf(lat));
                textLong.setText(String.valueOf(lon));
            }

        }
    }


}

I don't get any errors but when I am tapping the button which should get the coordinates, I get 'null' text in both views.

I also have included permissions for internet, access fine and coarse location.

Thanks in advance!

解决方案

You need to define LocationListener .

public class MainActivity extends Activity implements LocationListener{
    protected LocationManager locationManager;
    protected LocationListener locationListener;
    protected Context context;
    TextView txtLat;
    String lat;
    String provider;
    protected String latitude,longitude; 
    protected boolean gps_enabled,network_enabled;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        txtLat = (TextView) findViewById(R.id.textview1);

        locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
    }
    @Override
    public void onLocationChanged(Location location) {
        txtLat = (TextView) findViewById(R.id.textview1);
        txtLat.setText("Latitude:" + location.getLatitude() + ", Longitude:" + location.getLongitude());
    }

    @Override
    public void onProviderDisabled(String provider) {
        Log.d("Latitude","disable");
    }

    @Override
    public void onProviderEnabled(String provider) {
        Log.d("Latitude","enable");
    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
        Log.d("Latitude","status");
    }
}

And need to give below permission :

ACCESS_COARSE_LOCATION : It is used when we use network location provider for our Android app.

ACCESS_FINE_LOCATION : It is providing permission for both providers.

INTERNET : permission is must for the use of network provider.

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