如何在android中使用GPS获取位置？

Question

我想检测我的位置，我使用ACCESS_FINE_LOCATION许可，但是当我运行的应用程序，它崩溃并在屏幕上出现错误信息：

“APPNAME”已停止工作

以下是我的代码，我用于实现上述说明：

public class MainActivity extends AppCompatActivity { 
    LocationManager locationManager; 
    Location location; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     locationManager = (LocationManager) 
         getSystemService(Context.LOCATION_SERVICE); 
     if (ContextCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) { 
      return; 
     } 
     location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER); 
     Log.v("My Coordinates are: ", location.getLatitude() + " " + location.getLongitude()); 
    } 
} 

我在做什么错在这里？

请帮忙。

Answer 1

把您的许可，在清单中，所以你不必代码你再在其他活动中没有

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> 

实例化外景经理：如果GPS

LocationManager locationManager = (LocationManager) 
getSystemService(Context.LOCATION_SERVICE); 

获取坐标启用：

LocationListener locationListener = new MyLocationListener(); 
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER, 5000, 10, locationListener); 

这是一个完整实现的示例：

private class MyLocationListener implements LocationListener { 

    @Override 
    public void onLocationChanged(Location loc) { 
     editLocation.setText(""); 
     pb.setVisibility(View.INVISIBLE); 
     Toast.makeText(
       getBaseContext(), 
       "Location changed: Lat: " + loc.getLatitude() + " Lng: " 
        + loc.getLongitude(), Toast.LENGTH_SHORT).show(); 
     String longitude = "Longitude: " + loc.getLongitude(); 
     Log.v(TAG, longitude); 
     String latitude = "Latitude: " + loc.getLatitude(); 
     Log.v(TAG, latitude); 

     /*------- To get city name from coordinates -------- */ 
     String cityName = null; 
     Geocoder gcd = new Geocoder(getBaseContext(), Locale.getDefault()); 
     List<Address> addresses; 
     try { 
      addresses = gcd.getFromLocation(loc.getLatitude(), 
        loc.getLongitude(), 1); 
      if (addresses.size() > 0) { 
       System.out.println(addresses.get(0).getLocality()); 
       cityName = addresses.get(0).getLocality(); 
      } 
     } 
     catch (IOException e) { 
      e.printStackTrace(); 
     } 
     String s = longitude + "\n" + latitude + "\n\nMy Current City is: " 
      + cityName; 
     editLocation.setText(s); 
    } 

    @Override 
    public void onProviderDisabled(String provider) {} 

    @Override 
    public void onProviderEnabled(String provider) {} 

    @Override 
    public void onStatusChanged(String provider, int status, Bundle extras) {} 
}