Android MapViewのTabBarアプリケーション - > NullPointerException

Question

私はTabBarApplicationを持っています。マップタブを選択すると、アプリケーションがクラッシュします。ログには、 "final MapController mapControl = mapView.getController（）;"という行にNullpointerexceptionが表示されます。私誰かが私を助けることができる

:-(見当がつかない

HelloGoogleMaps.java：？

package de.example; 
    import java.util.List; 
    import android.graphics.drawable.Drawable; 
    import android.os.Bundle; 
    import com.google.android.maps.GeoPoint; 
    import com.google.android.maps.MapActivity; 
    import com.google.android.maps.MapController; 
    import com.google.android.maps.MapView; 
    import com.google.android.maps.Overlay; 
    import com.google.android.maps.OverlayItem; 

import de.example.R; 

public class HelloGoogleMaps extends MapActivity 
{ 
@Override 
public void onCreate(Bundle savedInstanceState) 
{ 
super.onCreate(savedInstanceState); 
setContentView(R.layout.main); 
      MapView mapView = (MapView) findViewById(R.id.mapview); 

     final MapController mapControl = mapView.getController(); 
     mapControl.setZoom(6); 
     mapView.setBuiltInZoomControls(true); 

     List<Overlay> mapOverlays = mapView.getOverlays(); 
     Drawable drawable = this.getResources().getDrawable(R.drawable.icon_32); 


     HelloItemizedOverlay itemizedoverlay = new  
       HelloItemizedOverlay(drawable,this); 

      GeoPoint point = new GeoPoint(51257818,7150129); 
      OverlayItem overlayitem = new OverlayItem(point, "asdf","Wuppertal\nAlte 
       Freiheit 9"); 


      itemizedoverlay.addOverlay(overlayitem); 

     mapOverlays.add(itemizedoverlay); 
} 



@Override 
protected boolean isRouteDisplayed() 
{ 
return false; 
} 

} 

map.xml（レイアウトフォルダ内）：

<?xml version="1.0" encoding="utf-8"?> 
<com.google.android.maps.MapView 
xmlns:android="http://schemas.android.com/apk/res/android" 
android:id="@+id/mapview" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent" 
android:clickable="true" 
android:apiKey="here is my key" 
/> 

ログイン猫：

08-05 13:13:34.787: ERROR/AndroidRuntime(463): FATAL EXCEPTION: main 
08-05 13:13:34.787: ERROR/AndroidRuntime(463): java.lang.RuntimeException: Unable to start activity ComponentInfo{de.example/de.example.HelloGoogleMaps}: java.lang.NullPointerException 
08-05 13:13:34.787: ERROR/AndroidRuntime(463):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647) 
08-05 13:13:34.787: ERROR/AndroidRuntime(463):  at android.app.ActivityThread.startActivityNow(ActivityThread.java:1487) 
08-05 13:13:34.787: ERROR/AndroidRuntime(463):  at android.app.LocalActivityManager.moveToState(LocalActivityManager.java:127) 
08-05 13:13:34.787: ERROR/AndroidRuntime(463):  at android.app.LocalActivityManager.startActivity(LocalActivityManager.java:339) 
08-05 13:13:34.787: ERROR/AndroidRuntime(463):  at android.widget.TabHost$IntentContentStrategy.getContentView(TabHost.java:654) 
08-05 13:13:34.787: ERROR/AndroidRuntime(463):  at android.widget.TabHost.setCurrentTab(TabHost.java:326) 
08-05 13:13:34.787: ERROR/AndroidRuntime(463):  at android.widget.TabHost$2.onTabSelectionChanged(TabHost.java:132) 
08-05 13:13:34.787: ERROR/AndroidRuntime(463):  at android.widget.TabWidget$TabClickListener.onClick(TabWidget.java:456) 
08-05 13:13:34.787: ERROR/AndroidRuntime(463):  at android.view.View.performClick(View.java:2485) 
08-05 13:13:34.787: ERROR/AndroidRuntime(463):  at android.view.View$PerformClick.run(View.java:9080) 
08-05 13:13:34.787: ERROR/AndroidRuntime(463):  at android.os.Handler.handleCallback(Handler.java:587) 
08-05 13:13:34.787: ERROR/AndroidRuntime(463):  at android.os.Handler.dispatchMessage(Handler.java:92) 
08-05 13:13:34.787: ERROR/AndroidRuntime(463):  at android.os.Looper.loop(Looper.java:130) 
08-05 13:13:34.787: ERROR/AndroidRuntime(463):  at android.app.ActivityThread.main(ActivityThread.java:3683) 
08-05 13:13:34.787: ERROR/AndroidRuntime(463):  at java.lang.reflect.Method.invokeNative(Native Method) 
08-05 13:13:34.787: ERROR/AndroidRuntime(463):  at java.lang.reflect.Method.invoke(Method.java:507) 
08-05 13:13:34.787: ERROR/AndroidRuntime(463):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
08-05 13:13:34.787: ERROR/AndroidRuntime(463):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 
08-05 13:13:34.787: ERROR/AndroidRuntime(463):  at dalvik.system.NativeStart.main(Native Method) 
08-05 13:13:34.787: ERROR/AndroidRuntime(463): Caused by: java.lang.NullPointerException 
08-05 13:13:34.787: ERROR/AndroidRuntime(463):  at de.example.HelloGoogleMaps.onCreate(HelloGoogleMaps.java:26) 
08-05 13:13:34.787: ERROR/AndroidRuntime(463):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
08-05 13:13:34.787: ERROR/AndroidRuntime(463):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611) 
08-05 13:13:34.787: ERROR/AndroidRuntime(463):  ... 18 more 

あなたはR.layout.mapを

setContentView(R.layout.main); 

もしかして：

Answer 1

あなたが呼んでいる:-)ありがとう？レイアウトがmap.xmlであるため、main.xmlではありません。