錯誤的ListView的Android

我有陣列50個元素的大小，但有些東西是空，因此在創建列表視圖它顯示像錯誤的ListView的Android

02-07 06:37:25.589: E/AndroidRuntime(1898): FATAL EXCEPTION: main 
02-07 06:37:25.589: E/AndroidRuntime(1898): java.lang.NullPointerException 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:394) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at android.widget.ArrayAdapter.getView(ArrayAdapter.java:362) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at android.widget.AbsListView.obtainView(AbsListView.java:2267) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at android.widget.ListView.makeAndAddView(ListView.java:1769) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at android.widget.ListView.fillDown(ListView.java:672) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at android.widget.ListView.fillFromTop(ListView.java:733) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at android.widget.ListView.layoutChildren(ListView.java:1622) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at android.widget.AbsListView.onLayout(AbsListView.java:2102) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at android.view.View.layout(View.java:13754) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at android.view.ViewGroup.layout(ViewGroup.java:4362) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1649) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1507) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at android.widget.LinearLayout.onLayout(LinearLayout.java:1420) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at android.view.View.layout(View.java:13754) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at android.view.ViewGroup.layout(ViewGroup.java:4362) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at android.widget.FrameLayout.onLayout(FrameLayout.java:448) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at android.view.View.layout(View.java:13754) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at android.view.ViewGroup.layout(ViewGroup.java:4362) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1649) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1507) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at android.widget.LinearLayout.onLayout(LinearLayout.java:1420) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at android.view.View.layout(View.java:13754) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at android.view.ViewGroup.layout(ViewGroup.java:4362) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at android.widget.FrameLayout.onLayout(FrameLayout.java:448) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at android.view.View.layout(View.java:13754) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at android.view.ViewGroup.layout(ViewGroup.java:4362) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:1866) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1687) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:998) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4212) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at android.view.Choreographer.doCallbacks(Choreographer.java:555) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at android.view.Choreographer.doFrame(Choreographer.java:525) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at android.os.Handler.handleCallback(Handler.java:615) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at android.os.Handler.dispatchMessage(Handler.java:92) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at android.os.Looper.loop(Looper.java:137) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at android.app.ActivityThread.main(ActivityThread.java:4745) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at java.lang.reflect.Method.invokeNative(Native Method) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at java.lang.reflect.Method.invoke(Method.java:511) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
02-07 06:37:25.589: E/AndroidRuntime(1898):  at dalvik.system.NativeStart.main(Native Method)

錯誤，這是我的代碼如何我創建列表視圖

String[] summary = new String[5]; 
    summary = obj.getAllSummary(); 
    ListView listView1 = (ListView) findViewById(R.id.listView1); 
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, 
    android.R.layout.simple_list_item_1, summary);  
    listView1.setAdapter(adapter);

我getAllSummary功能

private String[] summary = new String[5]; 
    //here some function that will set the `summary` array size. i will be  from 0 to 5 
    public String[] getAllSummary(){ 
    return summary; 
    }

此summary陣列具有一些字段作爲NUL湖一旦我想刪除它們。我的意思是我需要動態創建字符串數組。或者我應該在檢查數組元素是否爲null之後添加到listview中。如何做到這一點，請幫助我！

來源

2015-02-07 Thamaraiselvam

只是一個想法 - 你聲明一個大小爲5的數組，然後立即使用這個指針指向你要返回的數組。所以你不需要創建一個數組。改爲：'String [] summary = obj.getAllSummary（）;' – buddy123 2015-02-07 07:11:07

是的。但在getAllSummary函數中有5個字段。我可以正常填寫2或3。在極端情況下5.所以如果我填充3個元素，其他將爲空。當我返回'String []摘要'大小也將是5.所以我需要在'getAllSummary'動態創建數組ho'來做到這一點，謝謝 – Thamaraiselvam 2015-02-07 07:22:48

public String[] getAllSummary(){ 

     int k=0; 
     for(int i=0;i<summary.length;i++){ 
      if(summary[i]!=null) 
      k++; 
     } 

     String[] summary2 = new String[k]; 
     for(int i=0;i<summary.length;i++){ 
      if(summary[i]!=null) 
     summary2[i]=summary[i]; 
     } 
     return summary2; 
    }

來源

2015-02-07 07:28:54

謝謝你。它的作用就像魅力 – Thamaraiselvam 2015-02-07 07:29:46

正如你所說的數據項動態變化，任何時候1或2或5等，所以你應該使用ArrayList insted的字符串數組。在arrayList中不需要定義大小。當一個項目被添加到它時，它會佔用內存。

來源

2015-02-07 07:39:23

錯誤的ListView的Android

回答

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