TabBar 응용 프로그램의 안드로이드 MapView -> NullPointerException

Question

TabBarApplication이 있습니다. 지도 탭을 선택하면 응용 프로그램이 충돌합니다. 로그는 "final MapController mapControl = mapView.getController();"줄에 Nullpointerexception을 표시합니다. 내가

:-(아무 생각이 는

누군가가 나를 도울 수

HelloGoogleMaps.java : (레이아웃 폴더)

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 :

<?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" 
/> 

로그인 고양이 :

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 

당신은 R.layout.map을

setContentView(R.layout.main); 

찾으 셨나요?

Answer 1

당신이 전화하는거야 :-) 주셔서 감사합니다? 레이아웃이 이 아닌 map.xml이기 때문입니다.