Android GoogleMaps Null 포인터 예외 lagitutde

Question

Google지도를 시작할 때 Null Pointer Exception이 발생합니다. 문제가 무엇인지 모릅니다. 현재 위치를 찾으려고하기 전에지도가 표시되었습니다. 이제 방금 끝납니다. 여기

package com.example.postplay; 

import android.location.Criteria; 
import android.location.Location; 
import android.location.LocationManager; 
import android.os.Bundle; 
import android.support.v4.app.FragmentActivity; 
import android.view.Menu; 
import com.google.android.gms.maps.CameraUpdateFactory; 
import com.google.android.gms.maps.GoogleMap; 
import com.google.android.gms.maps.SupportMapFragment; 
import com.google.android.gms.maps.model.LatLng; 
import com.google.android.gms.maps.model.MarkerOptions; 

public class MapActive extends FragmentActivity { 

    private GoogleMap googleMap; 


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

     setUpMapIfNeeded();   
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.map_active, menu); 
     return true; 
    } 

    private void setUpMapIfNeeded() { 

     if(googleMap == null) 
     { 
      googleMap = ((SupportMapFragment) getSupportFragmentManager(). 
        findFragmentById(R.id.map)).getMap(); 
     } 
     if(googleMap != null) 
     { 
      setUpMap(); 
     } 

    } 

    private void setUpMap() { 
     // enable location layer of gmaps 
     googleMap.setMyLocationEnabled(true); 

     // get locationmanager object from system service 
     LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE); 

     // object to retrieve provider 
     Criteria criteria = new Criteria(); 

     // get name of best provider 
     String provider = locationManager.getBestProvider(criteria,true); 

     // get current location 
     Location myLocation = locationManager.getLastKnownLocation(provider); 

     //set map type 
     googleMap.setMapType(GoogleMap.MAP_TYPE_HYBRID); 

     //get latitude of the current loc 
     double latitude = myLocation.getLatitude(); 

     //get longitude 
     double longitude = myLocation.getLongitude(); 

     // create a current location object 
     LatLng latLng = new LatLng(latitude,longitude); 

     //show current location on map 
     googleMap.moveCamera(CameraUpdateFactory.newLatLng(latLng)); 

     //zoom in 
     googleMap.animateCamera(CameraUpdateFactory.newLatLng(latLng)); 
     googleMap.addMarker(new MarkerOptions().position(new LatLng(latitude,longitude)). 
                  title("You are here!")); 

    } 

} 

로그 고양이

04-06 01:49:16.819: W/ActivityThread(28484): ClassLoader.loadClass: The class loader returned by Thread.getContextClassLoader() may fail for processes that host multiple applications. You should explicitly specify a context class loader. For example: Thread.setContextClassLoader(getClass().getClassLoader()); 
04-06 01:49:16.829: D/dalvikvm(28484): Rejecting registerization due to ushr-int/lit8 v2, v4, (#1) 
04-06 01:49:16.839: D/dalvikvm(28484): Rejecting registerization due to +iget-object-quick v0, v3, (#8) 
04-06 01:49:16.849: D/dalvikvm(28484): Rejecting registerization due to +iget-object-quick v4, v6, (#8) 
04-06 01:49:16.849: D/dalvikvm(28484): Rejecting registerization due to +iget-object-quick v4, v6, (#8) 
04-06 01:49:16.849: D/AndroidRuntime(28484): Shutting down VM 
04-06 01:49:16.849: W/dalvikvm(28484): threadid=1: thread exiting with uncaught exception (group=0x41ab8e10) 
04-06 01:49:16.849: E/AndroidRuntime(28484): FATAL EXCEPTION: main 
04-06 01:49:16.849: E/AndroidRuntime(28484): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.postplay/com.example.postplay.MapActive}: java.lang.NullPointerException 
04-06 01:49:16.849: E/AndroidRuntime(28484): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2245) 
04-06 01:49:16.849: E/AndroidRuntime(28484): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2295) 
04-06 01:49:16.849: E/AndroidRuntime(28484): at android.app.ActivityThread.access$700(ActivityThread.java:150) 
04-06 01:49:16.849: E/AndroidRuntime(28484): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1280) 
04-06 01:49:16.849: E/AndroidRuntime(28484): at android.os.Handler.dispatchMessage(Handler.java:99) 
04-06 01:49:16.849: E/AndroidRuntime(28484): at android.os.Looper.loop(Looper.java:176) 
04-06 01:49:16.849: E/AndroidRuntime(28484): at android.app.ActivityThread.main(ActivityThread.java:5279) 
04-06 01:49:16.849: E/AndroidRuntime(28484): at java.lang.reflect.Method.invokeNative(Native Method)  
04-06 01:49:16.849: E/AndroidRuntime(28484): at java.lang.reflect.Method.invoke(Method.java:511)  
04-06 01:49:16.849: E/AndroidRuntime(28484): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)  
04-06 01:49:16.849: E/AndroidRuntime(28484): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)  
04-06 01:49:16.849: E/AndroidRuntime(28484): at dalvik.system.NativeStart.main(Native Method)  
04-06 01:49:16.849: E/AndroidRuntime(28484): Caused by: java.lang.NullPointerException  
04-06 01:49:16.849: E/AndroidRuntime(28484): at com.example.postplay.MapActive.setUpMap(MapActive.java:70)  
04-06 01:49:16.849: E/AndroidRuntime(28484): at  
com.example.postplay.MapActive.setUpMapIfNeeded(MapActive.java:45) 
04-06 01:49:16.849: E/AndroidRuntime(28484): at  
com.example.postplay.MapActive.onCreate(MapActive.java:26) 
04-06 01:49:16.849: E/AndroidRuntime(28484): at  
android.app.Activity.performCreate(Activity.java:5267) 
04-06 01:49:16.849: E/AndroidRuntime(28484): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1097) 
04-06 01:49:16.849: E/AndroidRuntime(28484): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2209) 
04-06 01:49:16.849: E/AndroidRuntime(28484): ... 11 more 

Answer 1

public Location getLastKnownLocation (String provider) 

Added in API level 1 
Returns a Location indicating the data from the last known location fix obtained from the given provider. 

This can be done without starting the provider. Note that this location could be out-of-date, for example if the device was turned off and moved to another location. 

If the provider is currently disabled, null is returned. 

Parameters 
provider the name of the provider 
Returns 
**the last known location for the provider, or null** 

당신은 라인 (70)

double latitude = myLocation.getLatitude(); 

그래서 myLocation가 null라고이다

Location myLocation = locationManager.getLastKnownLocation(provider);