Android Array適配器 - Getview -Textview拋出錯誤

我有一個使用ArrayAdapter生成的Lsit視圖。 getView方法中的TextView字段在使用來自POJO類的值填充時引發錯誤。您能否讓我知道我的代碼需要更正的地方。Android Array適配器 - Getview -Textview拋出錯誤

在此先感謝。

public class ApplianceAdapter extends ArrayAdapter<POJO_Appliance> { 
    private ArrayList<POJO_Appliance> appliance; 
    Context context; 
    LayoutInflater vi; 
    public ApplianceAdapter(Context context ,ArrayList<POJO_Appliance> appliance) {  
     super(context, 0, appliance); 
     this.appliance = new ArrayList<POJO_Appliance>();  
     this.appliance.addAll(appliance); 
     this.context =context; 
     vi = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
    }  
    private class ViewHolder { 
     TextView applianceName;  
     Button cancel,edit; 
    } 
    public View getView(final int position, View convertView, ViewGroup parent) {  
     ViewHolder holder; 
     if (convertView == null) { 
      holder = new ViewHolder(); 
       convertView = vi.inflate(R.layout.rowappliance, null); 
       holder.applianceName = (TextView) convertView.findViewById(R.id.tvapplianceName); 
       holder.cancel = (Button) convertView.findViewById(R.id.bCancel); 
       holder.edit = (Button) convertView.findViewById(R.id.bEdit);   
      convertView.setTag(holder); 
     } else { 
      holder = (ViewHolder) convertView.getTag(); 
     } 

     Log.i("AddAppliance"," Appliance Name : " + appliance.get(position).getApplianceName()); 
     holder.applianceName.setText(appliance.get(position).getApplianceName()); 

     // Cancel button 
     holder.cancel.setTag(position); 
     holder.cancel.setOnClickListener(new View.OnClickListener() {   
      public void onClick(View v) {     
       try { 
        int pos = (Integer) v.getTag();       
        Log.i("ConfirmAdapter ","Order cancel @ position : " + pos); 
        entry.deleteAppliance(roomName,appliance.get(pos).getApplianceName()); 
        refreshAdapter(); 
        } catch (Exception e) { 
        // TODO Auto-generated catch block 
        e.printStackTrace(); 
        } 
       }  
      });  
     return convertView; 
     } 
}

錯誤日誌：

01-18 17:28:32.259: E/AndroidRuntime(28641): FATAL EXCEPTION: main 
01-18 17:28:32.259: E/AndroidRuntime(28641): java.lang.NullPointerException 
01-18 17:28:32.259: E/AndroidRuntime(28641): at com.example.homeauto.AddAppliance$ApplianceAdapter.getView(AddAppliance.java:136) 
01-18 17:28:32.259: E/AndroidRuntime(28641): at android.widget.AbsListView.obtainView(AbsListView.java:2040) 
01-18 17:28:32.259: E/AndroidRuntime(28641): at android.widget.ListView.makeAndAddView(ListView.java:1772) 
01-18 17:28:32.259: E/AndroidRuntime(28641): at android.widget.ListView.fillDown(ListView.java:672) 
01-18 17:28:32.259: E/AndroidRuntime(28641): at android.widget.ListView.fillFromTop(ListView.java:732) 
01-18 17:28:32.259: E/AndroidRuntime(28641): at android.widget.ListView.layoutChildren(ListView.java:1611) 
01-18 17:28:32.259: E/AndroidRuntime(28641): at android.widget.AbsListView.onLayout(AbsListView.java:1870) 
01-18 17:28:32.259: E/AndroidRuntime(28641): at android.view.View.layout(View.java:11418) 
01-18 17:28:32.259: E/AndroidRuntime(28641): at android.view.ViewGroup.layout(ViewGroup.java:4328) 
01-18 17:28:32.259: E/AndroidRuntime(28641): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1652) 
01-18 17:28:32.259: E/AndroidRuntime(28641): at android.widget.LinearLayout.layoutHorizontal(LinearLayout.java:1641) 
01-18 17:28:32.259: E/AndroidRuntime(28641): at android.widget.LinearLayout.onLayout(LinearLayout.java:1417) 
01-18 17:28:32.259: E/AndroidRuntime(28641): at android.view.View.layout(View.java:11418) 
01-18 17:28:32.259: E/AndroidRuntime(28641): at android.view.ViewGroup.layout(ViewGroup.java:4328) 
01-18 17:28:32.259: E/AndroidRuntime(28641): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1652) 
01-18 17:28:32.259: E/AndroidRuntime(28641): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1510) 
01-18 17:28:32.259: E/AndroidRuntime(28641): at android.widget.LinearLayout.onLayout(LinearLayout.java:1415) 
01-18 17:28:32.259: E/AndroidRuntime(28641): at android.view.View.layout(View.java:11418) 
01-18 17:28:32.259: E/AndroidRuntime(28641): at android.view.ViewGroup.layout(ViewGroup.java:4328) 
01-18 17:28:32.259: E/AndroidRuntime(28641): at android.widget.FrameLayout.onLayout(FrameLayout.java:443) 
01-18 17:28:32.259: E/AndroidRuntime(28641): at android.view.View.layout(View.java:11418) 
01-18 17:28:32.259: E/AndroidRuntime(28641): at android.view.ViewGroup.layout(ViewGroup.java:4328) 
01-18 17:28:32.259: E/AndroidRuntime(28641): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1652) 
01-18 17:28:32.259: E/AndroidRuntime(28641): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1510) 
01-18 17:28:32.259: E/AndroidRuntime(28641): at android.widget.LinearLayout.onLayout(LinearLayout.java:1415) 
01-18 17:28:32.259: E/AndroidRuntime(28641): at android.view.View.layout(View.java:11418) 
01-18 17:28:32.259: E/AndroidRuntime(28641): at android.view.ViewGroup.layout(ViewGroup.java:4328) 
01-18 17:28:32.259: E/AndroidRuntime(28641): at android.widget.FrameLayout.onLayout(FrameLayout.java:443) 
01-18 17:28:32.259: E/AndroidRuntime(28641): at android.view.View.layout(View.java:11418) 
01-18 17:28:32.259: E/AndroidRuntime(28641): at android.view.ViewGroup.layout(ViewGroup.java:4328) 
01-18 17:28:32.259: E/AndroidRuntime(28641): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1489) 
01-18 17:28:32.259: E/AndroidRuntime(28641): at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2442) 
01-18 17:28:32.259: E/AndroidRuntime(28641): at android.os.Handler.dispatchMessage(Handler.java:99) 
01-18 17:28:32.259: E/AndroidRuntime(28641): at android.os.Looper.loop(Looper.java:137) 
01-18 17:28:32.259: E/AndroidRuntime(28641): at android.app.ActivityThread.main(ActivityThread.java:4441) 
01-18 17:28:32.259: E/AndroidRuntime(28641): at java.lang.reflect.Method.invokeNative(Native Method) 
01-18 17:28:32.259: E/AndroidRuntime(28641): at java.lang.reflect.Method.invoke(Method.java:511) 
01-18 17:28:32.259: E/AndroidRuntime(28641): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
01-18 17:28:32.259: E/AndroidRuntime(28641): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
01-18 17:28:32.259: E/AndroidRuntime(28641): at dalvik.system.NativeStart.main(Native Method)

來源

2013-01-18 user1822729

它會拋出什麼錯誤？發佈logcat錯誤報告.. –

發佈您的logcat – GrIsHu

現在我已添加logcat – user1822729

這可能是由於在錯誤的參考findViewById。你應該檢查你的文本視圖或佈局視圖的編號:-)

來源

2014-12-25 12:38:01

Android Array適配器 - Getview -Textview拋出錯誤

回答

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