谷歌地图Android Studio LocationManager错误

Question

嗨，即时尝试显示带有位置管理器的谷歌地图。首先，来自地图的默认活动正在工作，但是当我尝试一些教程时，我总是在下面的代码中出现错误。我不知道什么是错的，但我在一些项目中跟着教程。

locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 1, 1, this); 

这是我的课

public class MainActivity extends ActionBarActivity implements LocationListener { 
    GoogleMap map; 

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

     //To get MapFragment reference from xml layout 
     MapFragment mapFragment = (MapFragment) getFragmentManager().findFragmentById(R.id.map); 

     //To get map object 
     map = mapFragment.getMap(); 

     /* //to show current location in the map 
     map.setMyLocationEnabled(true); 

     map.setOnMapClickListener(new GoogleMap.OnMapClickListener() { 
      @Override 
      public void onMapClick(LatLng latLng) { 

       Toast.makeText(getApplicationContext(), latLng.toString(), Toast.LENGTH_LONG).show(); 
      } 
     });*/ 

     //To setup location manager 
     LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); 

     //To request location updates 
     locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 1, 1, this); 

    } 


    @Override 
    public void onLocationChanged(Location location) { 

     //To clear map data 
     map.clear(); 

     //To hold location 
     LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude()); 

     //To create marker in map 
     MarkerOptions markerOptions = new MarkerOptions(); 
     markerOptions.position(latLng); 
     markerOptions.title("My Location"); 
     //adding marker to the map 
     map.addMarker(markerOptions); 

     //opening position with some zoom level in the map 
     map.animateCamera(CameraUpdateFactory.newLatLngZoom(latLng, 17.0f)); 
    } 

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

    } 

    @Override 
    public void onProviderEnabled(String provider) { 

    } 

    @Override 
    public void onProviderDisabled(String provider) { 

    } 
} 

这些活动中的进口

import android.content.Context; 
import android.location.Location; 
import android.location.LocationListener; 
import android.location.LocationManager; 
import android.os.Bundle; 
import android.support.v7.app.ActionBarActivity; 
import android.support.v7.app.AppCompatActivity; 
import android.widget.Toast; 
import com.google.android.gms.maps.CameraUpdateFactory; 
import com.google.android.gms.maps.GoogleMap; 
import com.google.android.gms.maps.MapFragment; 
import com.google.android.gms.maps.model.LatLng; 
import com.google.android.gms.maps.model.MarkerOptions; 

更新： 我在代码中没有错误，但是当我运行了此错误logcat：

E/AndroidRuntime﹕ FATAL EXCEPTION: main 
    Process: com.example.jathniel.mydoctorfinder, PID: 1370 
    java.lang.NoSuchMethodError: No virtual method checkSelfPermission(Ljava/lang/String;)I in class Lcom/example/jathniel/mydoctorfinder/MapsActivity; or its super classes (declaration of 'com.example.jathniel.mydoctorfinder.MapsActivity' appears in /data/app/com.example.jathniel.mydoctorfinder-2/base.apk) 
      at com.example.jathniel.mydoctorfinder.MapsActivity.onCreate(MapsActivity.java:50) 
      at android.app.Activity.performCreate(Activity.java:6289) 
      at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119) 
      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2646) 
      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2758) 
      at android.app.ActivityThread.access$900(ActivityThread.java:177) 
      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1448) 
      at android.os.Handler.dispatchMessage(Handler.java:102) 
      at android.os.Looper.loop(Looper.java:145) 
      at android.app.ActivityThread.main(ActivityThread.java:5942) 
      at java.lang.reflect.Method.invoke(Native Method) 
      at java.lang.reflect.Method.invoke(Method.java:372) 
      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1400) 
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1195) 

Answer 1

您应该在位置管理器初始化之前检查清单中的权限。

private boolean Permission() 

{

String permission = "android.permission.ACCESS_COARSE_LOCATION"; 
int res = getContext().checkCallingOrSelfPermission(permission); 
return (res == PackageManager.PERMISSION_GRANTED);    

}