当Onclick Google地图崩溃

Question

Im编码当前是谷歌地图应用程序。 我有一个包含地图片段和MapActivity的XML文件。 我试图添加一个标记，如果用户点击地图，但应用程序崩溃。

我试图解决这个问题几个小时，但我只是没有任何线索。

问候 迈克尔

package de.arvidg.exampleactionbartabs; 

import java.util.ArrayList; 
import java.util.List; 

import com.google.android.gms.common.ConnectionResult; 
import com.google.android.gms.common.GooglePlayServicesUtil; 
import com.google.android.gms.maps.CameraUpdateFactory; 
import com.google.android.gms.maps.GoogleMap; 
import com.google.android.gms.maps.GoogleMap.OnMapLongClickListener; 
import com.google.android.gms.maps.MapFragment; 
//import com.google.android.gms.maps.SupportMapFragment; 
import com.google.android.gms.maps.GoogleMap.OnMapClickListener; 
import com.google.android.gms.maps.model.LatLng; 
import com.google.android.gms.maps.model.MarkerOptions; 
import com.google.android.maps.MapActivity; 
import com.google.android.maps.MapView; 
import com.google.android.maps.Overlay; 

import android.app.Activity; 
import android.app.AlertDialog; 
import android.app.FragmentManager; 
import android.location.Location; 
import android.os.Bundle; 
//import android.support.v4.app.FragmentActivity; 
//import android.support.v4.app.FragmentManager; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.widget.TextView; 
import android.widget.Toast; 

public class MapFrag extends MapActivity implements OnMapClickListener{ 

    private GoogleMap myMap; 

    private MapFragment mapView; 

    private MyItemizedOverlay myItemizedOverlay = null; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.map); 



     GoogleMap map = ((MapFragment) getFragmentManager().findFragmentById(
       R.id.map)).getMap(); 

     mapView=((MapFragment) getFragmentManager().findFragmentById(
       R.id.map)); 

     map.setMyLocationEnabled(true); 

     map.setTrafficEnabled(true); 

     map.addMarker(new MarkerOptions() 
     .position(new LatLng(40.417325, 40.417325)) 
     .title("Hello!")); 

     map.setOnMapClickListener(this); 
    } 



    @Override 
    protected boolean isRouteDisplayed() { 
     // TODO Auto-generated method stub 
     return false; 
    } 


    @Override 
    public void onMapClick(LatLng point) { 
     myMap.addMarker(new MarkerOptions().position(point).title("jojoa")); 


    } 

} 

logcat的输出：

03-08 16:20:38.500: I/Adreno200-EGL(10598): Build Date: 07/31/12 Tue 
03-08 16:20:38.500: I/Adreno200-EGL(10598): Local Branch: 
03-08 16:20:38.500: I/Adreno200-EGL(10598): Remote Branch: quic/master 
03-08 16:20:38.500: I/Adreno200-EGL(10598): Local Patches: NONE 
03-08 16:20:38.500: I/Adreno200-EGL(10598): Reconstruct Branch: AU_LINUX_ANDROID_JB.04.01.01.00.036 + NOTHING 
03-08 16:20:38.540: D/OpenGLRenderer(10598): Enabling debug mode 0 
03-08 16:20:38.550: I/MapActivity(10598): Handling network change notification:CONNECTED 
03-08 16:20:38.550: E/MapActivity(10598): Couldn't get connection factory client 
03-08 16:20:38.920: D/dalvikvm(10598): GC_FOR_ALLOC freed 3301K, 46% free 6748K/12288K, paused 29ms, total 29ms 
03-08 16:20:38.930: W/CursorWrapperInner(10598): Cursor finalized without prior close() 
03-08 16:20:40.050: D/AndroidRuntime(10598): Shutting down VM 
03-08 16:20:40.050: W/dalvikvm(10598): threadid=1: thread exiting with uncaught exception (group=0x40d71300) 
03-08 16:20:40.060: E/AndroidRuntime(10598): FATAL EXCEPTION: main 
03-08 16:20:40.060: E/AndroidRuntime(10598): java.lang.NullPointerException 
03-08 16:20:40.060: E/AndroidRuntime(10598): at de.arvidg.exampleactionbartabs.MapFrag.onMapClick(MapFrag.java:75) 
03-08 16:20:40.060: E/AndroidRuntime(10598): at com.google.android.gms.maps.GoogleMap$6.onMapClick(Unknown Source) 
03-08 16:20:40.060: E/AndroidRuntime(10598): at com.google.android.gms.internal.t$a.onTransact(Unknown Source) 
03-08 16:20:40.060: E/AndroidRuntime(10598): at android.os.Binder.transact(Binder.java:326) 
03-08 16:20:40.060: E/AndroidRuntime(10598): at com.google.android.gms.maps.internal.IOnMapClickListener$Stub$Proxy.onMapClick(IOnMapClickListener.java:93) 
03-08 16:20:40.060: E/AndroidRuntime(10598): at maps.i.s.b(Unknown Source) 
03-08 16:20:40.060: E/AndroidRuntime(10598): at maps.y.v.c(Unknown Source) 
03-08 16:20:40.060: E/AndroidRuntime(10598): at maps.y.bf.onSingleTapConfirmed(Unknown Source) 
03-08 16:20:40.060: E/AndroidRuntime(10598): at maps.d.v.onSingleTapConfirmed(Unknown Source) 
03-08 16:20:40.060: E/AndroidRuntime(10598): at maps.d.j.handleMessage(Unknown Source) 
03-08 16:20:40.060: E/AndroidRuntime(10598): at android.os.Handler.dispatchMessage(Handler.java:99) 
03-08 16:20:40.060: E/AndroidRuntime(10598): at android.os.Looper.loop(Looper.java:137) 
03-08 16:20:40.060: E/AndroidRuntime(10598): at android.app.ActivityThread.main(ActivityThread.java:4978) 
03-08 16:20:40.060: E/AndroidRuntime(10598): at java.lang.reflect.Method.invokeNative(Native Method) 
03-08 16:20:40.060: E/AndroidRuntime(10598): at java.lang.reflect.Method.invoke(Method.java:511) 
03-08 16:20:40.060: E/AndroidRuntime(10598): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791) 
03-08 16:20:40.060: E/AndroidRuntime(10598): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:558) 
03-08 16:20:40.060: E/AndroidRuntime(10598): at dalvik.system.NativeStart.main(Native Method) 
03-08 16:20:41.240: I/Process(10598): Sending signal. PID: 10598 SIG: 9 

Answer 1

GoogleMap map = ((MapFragment)getFragmentManager().findFragmentById(R.id.map)).getMap()是提高一个NullPointerException，被点击时它。

确保使用的ID与XML文件中定义的相同。