Androidで奇妙な致命的な例外ListView

Question

私はアンドロイドの世界ではかなり新しいと私は扱うことができない混乱のバグを持っています。

私は、以下のリストビューを持っている：

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent"> 


    <ListView 
     android:id="@+id/listView1" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" > 

    </ListView> 

</LinearLayout> 

そしてこの活性：

package com.study.semesterplaner.vorlesungszeit; 

import java.util.ArrayList; 

import android.app.Activity; 
import android.content.Context; 
import android.os.Bundle; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.BaseAdapter; 
import android.widget.ListView; 
import android.widget.TextView; 

import com.study.constants.IntentConstants; 
import com.study.droid.R; 
import common.vorlesung.Vorlesung; 
import common.vorlesung.VorlesungszeitHaeufigkeit; 
import common.vorlesung.vorlesungszeit.Vorlesungszeit; 

public class VorlesungszeitListActivity extends Activity{ 

    private ListView _listView; 
    private ArrayList<Vorlesungszeit> _vorlesungszeiten; 
    private VorlesungszeitListAdapter _listAdapter; 

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

     Vorlesung selectedVorlesung = (Vorlesung) getIntent().getExtras().get(IntentConstants.INTENT_VORLESUNG_DETAILS); 
     _vorlesungszeiten = selectedVorlesung.getVorlesungsZeiten(); 

     _listView = (ListView) findViewById(R.id.listView1); 
     _listAdapter = new VorlesungszeitListAdapter(); 
     _listView.setAdapter(_listAdapter); 
    } 

    private class VorlesungszeitListAdapter extends BaseAdapter{ 

     @Override 
     public int getCount() { 
      return _vorlesungszeiten.size(); 
     } 

     @Override 
     public Object getItem(int position) { 
      return _vorlesungszeiten.get(position); 
     } 

     @Override 
     public long getItemId(int position) { 
      return position; 
     } 

     @Override 
     public View getView(int position, View convertView, ViewGroup parent) { 
      View view = convertView; 
      LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      view = vi.inflate(R.layout.row_three_textviews, null); 
      TextView top = (TextView) view.findViewById(R.id.row_three_textview_ONE); 
      TextView mid = (TextView) view.findViewById(R.id.row_three_textview_TWO); 
      TextView bottom = (TextView) view.findViewById(R.id.row_three_textview_THREE); 

      Vorlesungszeit vZeit = _vorlesungszeiten.get(position); 

      top.setText(vZeit.getTag() + ", " + vZeit.getVorlesungsbeginn() + " - " + vZeit.getVorlesungsende() + " Uhr"); 
      mid.setText("Raum: " + vZeit.getRaum()); 
      bottom.setText(VorlesungszeitHaeufigkeit.getHauefigkeitText(vZeit.getHaeufigkeit())); 

      return view; 
     } 

    } 
} 

私はこの活動を開始しようとした場合、私はこの奇妙な例外を取得：

03-17 21:48:38.867: E/AndroidRuntime(8864): FATAL EXCEPTION: main 
03-17 21:48:38.867: E/AndroidRuntime(8864): java.lang.NullPointerException 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.widget.ListView.measureScrapChild(ListView.java:1136) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.widget.ListView.measureHeightOfChildren(ListView.java:1267) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.widget.ListView.onMeasure(ListView.java:1128) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.view.View.measure(View.java:8524) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3257) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1017) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.widget.LinearLayout.measureVertical(LinearLayout.java:386) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.widget.LinearLayout.onMeasure(LinearLayout.java:309) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.view.View.measure(View.java:8524) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3257) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.view.View.measure(View.java:8524) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3257) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.view.View.measure(View.java:8524) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3257) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.view.View.measure(View.java:8524) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3257) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1017) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.widget.LinearLayout.measureVertical(LinearLayout.java:386) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.widget.LinearLayout.onMeasure(LinearLayout.java:309) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.view.View.measure(View.java:8524) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3257) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.view.View.measure(View.java:8524) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3257) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1017) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.widget.LinearLayout.measureVertical(LinearLayout.java:386) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.widget.LinearLayout.onMeasure(LinearLayout.java:309) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.view.View.measure(View.java:8524) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3257) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.view.View.measure(View.java:8524) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.widget.LinearLayout.measureVertical(LinearLayout.java:531) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.widget.LinearLayout.onMeasure(LinearLayout.java:309) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.view.View.measure(View.java:8524) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3257) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.view.View.measure(View.java:8524) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.view.ViewRoot.performTraversals(ViewRoot.java:915) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.view.ViewRoot.handleMessage(ViewRoot.java:1991) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.os.Handler.dispatchMessage(Handler.java:99) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.os.Looper.loop(Looper.java:150) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at android.app.ActivityThread.main(ActivityThread.java:4293) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at java.lang.reflect.Method.invokeNative(Native Method) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at java.lang.reflect.Method.invoke(Method.java:507) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:849) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:607) 
03-17 21:48:38.867: E/AndroidRuntime(8864):  at dalvik.system.NativeStart.main(Native Method) 

私はいけません何が間違っているかを知る。私は、デバッガを使用して、トラブルシューティングコードを探すためにしようとしたが、プログラムの開発にも活動ののonCreate Methodeのアクセスいけない... com.study.droid.Rの

Answer 1

輸入は私に容疑者を思わ