申請強制關閉，試圖建立一個TextView的上customListAdapter

時，我想設置文本TexView，其實我存儲數量數組列表，但它總是強制關閉。所以，我嘗試只是手動設置，但它仍然強制關閉。我不知道爲什麼其他textview能夠設置，但不能設置，amountStr。申請強制關閉，試圖建立一個TextView的上customListAdapter

謝謝你提前爲您的建議。

這裏是一些代碼：

ActActivity.class

public class ActActivity extends ListActivity { 

    private CustomListAdapter listAdapter; 
    private String[] activities_list; 

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

     activities_list = getResources().getStringArray(R.array.Activities_array); 

     listAdapter = new CustomListAdapter(this,R.layout.list_item_choose_activities,activities_list);  

     setListAdapter(listAdapter); 

    } 

    private class CustomListAdapter extends ArrayAdapter<String>{ 

     private String[] items; 
     public CustomListAdapter(Context context, int textViewResourceId, 
       String[] items) { 
      super(context, textViewResourceId, items); 
      this.items = items; 
     } 

     @Override 
     public View getView(int position, View convertView, ViewGroup parent) { 
      View v = convertView; 
      if(v == null){ 
       LayoutInflater vi = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
       v = vi.inflate(R.layout.list_item_choose_activities, null); 
      } 

      TextView actNameStr = (TextView)v.findViewById(R.id.list_act_txt); 
      ImageView actLogo = (ImageView)v.findViewById(R.id.act_logo); 
      TextView amountStr = (TextView)findViewById(R.id.amount_text); 

      actNameStr.setText(items[position]); 
      // i wanna set text number here, actually i store number in array list but,it always force close. so, i try just set manually though, it still force close. 
      amountStr.setText("5"); 


      //Set icon of activity on each list items 
      switch (position) { 
      case 0: 
       actLogo.setBackgroundResource(R.drawable.a01_ofroad); 
       break; 
      case 1: 
       actLogo.setBackgroundResource(R.drawable.a02_bungeejump); 
       break; 
      case 2: 
       actLogo.setBackgroundResource(R.drawable.a03_art); 
       break; 
         default: 
       actLogo.setBackgroundResource(R.drawable.nologo); 
       break; 
      } 
     return v; 
    } 

    } 
}

list_item_choose_activities.xml

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:orientation="horizontal"> 
<ImageView 
    android:id="@+id/act_logo" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignParentLeft="true" 
    android:layout_centerVertical="true" 
    android:layout_marginLeft="5sp" 
    android:background="@drawable/nologo" 
    /> 
<TextView 
    android:id="@+id/list_act_txt" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_toRightOf="@id/act_logo" 
    android:textColor="#494644" 
    android:padding="15dp" 
    android:textSize="15sp" 
    android:layout_gravity="left" 
    android:textStyle="bold" 
    >  
</TextView> 
<LinearLayout 
    android:id="@+id/list_bubble" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignParentRight="true" 
    android:layout_centerVertical="true" 
    android:layout_gravity="center" 
    android:background="@drawable/list_bubble_num"> 
    <TextView 
    android:id="@+id/amount_text" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:gravity="center" 
    android:textSize="15sp" 
    android:textStyle="bold" 
    android:textColor="#FFFFFF" 
    android:text="0" 
    /> 
</LinearLayout> 

</RelativeLayout>

logcat的

01-09 16:38:47.051: E/AndroidRuntime(21240): FATAL EXCEPTION: main 
01-09 16:38:47.051: E/AndroidRuntime(21240): java.lang.NullPointerException 
01-09 16:38:47.051: E/AndroidRuntime(21240): at com.april.travel.ActActivity$CustomListAdapter.getView(ActActivity.java:181) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.widget.AbsListView.obtainView(AbsListView.java:1430) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.widget.ListView.measureHeightOfChildren(ListView.java:1216) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.widget.ListView.onMeasure(ListView.java:1127) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.view.View.measure(View.java:8313) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1017) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.widget.LinearLayout.measureVertical(LinearLayout.java:386) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.widget.LinearLayout.onMeasure(LinearLayout.java:309) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.view.View.measure(View.java:8313) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.view.View.measure(View.java:8313) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.view.View.measure(View.java:8313) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.view.View.measure(View.java:8313) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:581) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:365) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.view.View.measure(View.java:8313) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.view.View.measure(View.java:8313) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:581) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:365) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.view.View.measure(View.java:8313) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:581) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:365) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.view.View.measure(View.java:8313) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.view.View.measure(View.java:8313) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.view.View.measure(View.java:8313) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.view.ViewRoot.performTraversals(ViewRoot.java:839) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.view.ViewRoot.handleMessage(ViewRoot.java:1859) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.os.Handler.dispatchMessage(Handler.java:99) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.os.Looper.loop(Looper.java:130) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at android.app.ActivityThread.main(ActivityThread.java:3683) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at java.lang.reflect.Method.invokeNative(Native Method) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at java.lang.reflect.Method.invoke(Method.java:507) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 
01-09 16:38:47.051: E/AndroidRuntime(21240): at dalvik.system.NativeStart.main(Native Method)

來源

2012-01-09 April Smith

TextView amountStr = (TextView)findViewById(R.id.amount_text);也許你需要更改爲： TextView amountStr = (TextView)v.findViewById(R.id.amount_text);

來源

2012-01-09 10:15:37 idiottiger

大聲笑。我是多麼愚蠢？我的大腦+眼睛需要休息一下。不管怎麼說，還是要謝謝你 – 2012-01-09 10:17:42

是否缺少在

的TextView amountStr =（TextView的）findViewById（R.id.amount_text）到v的參考;

？

不是應該

的TextView amountStr =（TextView的）v.findViewById（R.id.amount_text）;

？

來源

2012-01-09 10:16:20 Marle1

申請強制關閉，試圖建立一個TextView的上customListAdapter

回答

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