填充自定義適配器，數組列表和HashMap android上的

我有一個自定義列表視圖（如打擊）的自定義列表視圖和我有與HashMap的填充數組列表 custom listview staructure 填充自定義適配器，數組列表和HashMap android上的

現在我要填寫定製與自定義適配器，數組列表和HashMap列表視圖

我嘗試了很多，諸多檢查的問題，但我不是成功

這裏是我的自定義適配器代碼

public class messages_Adapter extends ArrayAdapter<HashMap<String, String>> 
{ 
    ArrayList<HashMap<String, String>> MessageAdapter=new ArrayList<HashMap<String,String>>(); 
    Context context; 
    int layoutResourceId; 

    public messages_Adapter(Context context,int layoutResourceId,ArrayList<HashMap<String, String>> MessageAdapter) 
    { 
     super(context, layoutResourceId, MessageAdapter); 
     this.MessageAdapter=MessageAdapter; 
     this.context=context; 
     this.layoutResourceId=layoutResourceId; 

    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parrent) 
    { 
     HashMap<String, String>hashmap_Current; 
     View view=convertView; 

     if (view==null) 
     { 
      LayoutInflater layoutInflater=(LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      view=layoutInflater.inflate(layoutResourceId, parrent, false); 
     } 
     hashmap_Current=new HashMap<String, String>(); 
     hashmap_Current=MessageAdapter.get(position); 

     Log.e("Zdit", hashmap_Current.toString()); 

     TextView lbl_MessageID=   (TextView)findViewById(id.xActMessages_LblMessageID); 
     lbl_MessageID.setText(hashmap_Current.get("id").toString()); 
     view.setTag(lbl_MessageID); 


     TextView lbl_MessageContent=  (TextView)findViewById(id.xActMessages_LblMessageText); 
     lbl_MessageContent.setText(hashmap_Current.get("message")); 
     view.setTag(lbl_MessageContent); 


     TextView lbl_TimeAdd=   (TextView)findViewById(id.xActMessages_LblTimeAdd); 
     lbl_TimeAdd.setText(hashmap_Current.get("time_add")); 
     view.setTag(lbl_TimeAdd); 

     TextView lbl_DateAdd=   (TextView)findViewById(id.xActMessages_LblDateAdd); 
     lbl_DateAdd.setText(hashmap_Current.get("date_add")); 
     view.setTag(lbl_DateAdd); 

     return view; 
    } 

}

，這是我的貓登錄

10-12 13:41:13.181: E/AndroidRuntime(2298): FATAL EXCEPTION: main 
10-12 13:41:13.181: E/AndroidRuntime(2298): Process: com.TB.Zdit, PID: 2298 
10-12 13:41:13.181: E/AndroidRuntime(2298): java.lang.NullPointerException 
10-12 13:41:13.181: E/AndroidRuntime(2298):  at com.TB.Zdit.JAct_Messages$messages_Adapter.getView(JAct_Messages.java:243) 
10-12 13:41:13.181: E/AndroidRuntime(2298):  at android.widget.AbsListView.obtainView(AbsListView.java:2263) 
10-12 13:41:13.181: E/AndroidRuntime(2298):  at android.widget.ListView.measureHeightOfChildren(ListView.java:1263) 
10-12 13:41:13.181: E/AndroidRuntime(2298):  at android.widget.ListView.onMeasure(ListView.java:1175) 
10-12 13:41:13.181: E/AndroidRuntime(2298):  at android.view.View.measure(View.java:16458) 
10-12 13:41:13.181: E/AndroidRuntime(2298):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125) 
10-12 13:41:13.181: E/AndroidRuntime(2298):  at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404) 
10-12 13:41:13.181: E/AndroidRuntime(2298):  at android.widget.LinearLayout.measureVertical(LinearLayout.java:695) 
10-12 13:41:13.181: E/AndroidRuntime(2298):  at android.widget.LinearLayout.onMeasure(LinearLayout.java:588) 
10-12 13:41:13.181: E/AndroidRuntime(2298):  at android.view.View.measure(View.java:16458)

消息適配器

do 
      { 
       hashMap_Messages=new HashMap<String, String>(); 
       hashMap_Messages.put("id", cursor_Fetcher.getString(0)); 
       hashMap_Messages.put("message", cursor_Fetcher.getString(1)); 
       hashMap_Messages.put("time_add", cursor_Fetcher.getString(2)); 
       hashMap_Messages.put("date_add", cursor_Fetcher.getString(3)); 

       arrayList_Messages.add(hashMap_Messages); 
      } 
      while (cursor_Fetcher.moveToNext()); 

      messages_Adapter messAdapter=new messages_Adapter(getApplicationContext(),R.layout.xact_messages, arrayList_Messages); 
      lstViw_Messages.setAdapter(messAdapter);

自定義列表視圖XML文件

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

    <LinearLayout 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:orientation="vertical" 
     android:padding="5sp" 
     android:background="@drawable/linerlayout_border" 
     android:paddingTop="5sp" 
     android:paddingBottom="5sp" 
     android:layout_marginTop="5sp" 
     android:layout_marginBottom="5sp" > 

     <LinearLayout 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:orientation="vertical" > 

      <TextView 
       android:id="@+id/xActMessages_LblMessageText" 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       android:text="Message Content\nMessage Content\nMessage Content" 
       android:textAppearance="?android:attr/textAppearanceMedium" 
       android:gravity="right" 
       android:textColor="#000000" /> 

     </LinearLayout> 

     <LinearLayout 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:orientation="vertical" 
      android:visibility="invisible" > 

      <TextView 
       android:id="@+id/xActMessages_LblMessageID" 
       android:layout_width="0sp" 
       android:layout_height="0sp" 
       android:text="Message ID" 
       android:textAppearance="?android:attr/textAppearanceMedium" 
       android:gravity="right" /> 

     </LinearLayout> 

     <LinearLayout 
      android:baselineAligned="false" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:weightSum="100" 
      android:orientation="horizontal" 
      android:paddingTop="20sp" > 

      <LinearLayout 
       android:layout_width="0sp" 
       android:layout_height="wrap_content" 
       android:layout_weight="60" > 

       <Button 
        android:id="@+id/button1" 
        style="?android:attr/buttonStyleSmall" 
        android:layout_width="48dp" 
        android:layout_height="48dp" 
        android:background="@drawable/button_ok" 
        android:textColor="#FFFFFF" 
        android:drawableLeft="@drawable/sharethis_32_white" 
        android:paddingLeft="7dp" 
        android:layout_marginRight="5dp" /> 

       <Button 
        android:id="@+id/button1" 
        style="?android:attr/buttonStyleSmall" 
        android:layout_width="48dp" 
        android:layout_height="48dp" 
        android:background="@drawable/button_add" 
        android:textColor="#FFFFFF" 
        android:drawableLeft="@drawable/edit_32_white" 
        android:paddingLeft="7dp" 
        android:layout_marginRight="5dp" /> 

       <Button 
        android:id="@+id/button1" 
        style="?android:attr/buttonStyleSmall" 
        android:layout_width="48dp" 
        android:layout_height="48dp" 
        android:textColor="#FFFFFF" 
        android:background="@drawable/button_delete" 
        android:drawableLeft="@drawable/delete_32_delete" 
        android:paddingLeft="7dp" /> 

      </LinearLayout> 

      <LinearLayout 
       android:layout_width="0sp" 
       android:layout_height="match_parent" 
       android:layout_weight="40" 
       android:orientation="vertical" 
       android:weightSum="100" > 


       <LinearLayout 
        android:layout_width="match_parent" 
        android:layout_height="0sp" 
        android:orientation="vertical" 
        android:gravity="center" 
        android:layout_weight="50" > 

        <TextView 
         android:id="@+id/xActMessages_LblTimeAdd" 
         android:layout_width="wrap_content" 
         android:layout_height="wrap_content" 
         android:text="Time" 
         android:textColor="#000000" /> 

       </LinearLayout> 

       <LinearLayout 
        android:layout_width="match_parent" 
        android:layout_height="0sp" 
        android:orientation="vertical" 
        android:gravity="center" 
        android:layout_weight="50"> 

        <TextView 
         android:id="@+id/xActMessages_LblDateAdd" 
         android:layout_width="wrap_content" 
         android:layout_height="match_parent" 
         android:text="Date" 
         android:textColor="#000000" /> 

       </LinearLayout> 
      </LinearLayout> 
     </LinearLayout> 
    </LinearLayout> 
</LinearLayout>

謝謝

來源

2014-10-12 HamidTB

getview方法中的第243行是什麼？ – Shvet 2014-10-12 11:14:48

@Dhaval Gondaliya'lbl_MessageID.setText（hashmap_Current.get（「id」）。toString（））;' – HamidTB 2014-10-12 11:17:05

而不是'id.xActMessages_LblMessageID'使用'R.id.xActMessages_LblMessageID'。 – Shvet 2014-10-12 11:20:25

我已經使用ViewHolder新的適配器代碼方法試試這個：

public class messages_Adapter extends ArrayAdapter<HashMap<String, String>> 
{ 
    ArrayList<HashMap<String, String>> MessageAdapter=new ArrayList<HashMap<String,String>>(); 
    Context context; 
    int layoutResourceId; 

    public messages_Adapter(Context context,int layoutResourceId,ArrayList<HashMap<String, String>> MessageAdapter) 
    { 
     super(context, layoutResourceId, MessageAdapter); 
     this.MessageAdapter=MessageAdapter; 
     this.context=context; 
     this.layoutResourceId=layoutResourceId; 

    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parrent) 
    { 
     HashMap<String, String>hashmap_Current; 
     View view=convertView; 
    final ViewHolder holder; 

     if (view==null) 
     { 
      LayoutInflater layoutInflater=(LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      view=layoutInflater.inflate(layoutResourceId, parrent, false); 
     holder=new ViewHolder(); 
     holder.lbl_MessageID=(TextView)view.findViewById(id.xActMessages_LblMessageID); 
     holder.lbl_MessageContent=(TextView)view.findViewById(id.xActMessages_LblMessageText);   
     holder.lbl_TimeAdd=(TextView)view.findViewById(id.xActMessages_LblTimeAdd); 
     holder.lbl_DateAdd=(TextView)view.findViewById(id.xActMessages_LblDateAdd); 
     view.setTag(holder); 
    }else{ 

     holder=(ViewHolder)view.getTag(); 
    } 

     hashmap_Current=new HashMap<String, String>(); 
     hashmap_Current=MessageAdapter.get(position); 

     Log.e("Zdit", hashmap_Current.toString()); 


     holder.lbl_MessageID.setText(hashmap_Current.get("id").toString());  
     holder.lbl_MessageContent.setText(hashmap_Current.get("message"));  
     holder.lbl_TimeAdd.setText(hashmap_Current.get("time_add"));  
     holder.lbl_DateAdd.setText(hashmap_Current.get("date_add")); 


     return view; 
    } 

    static class ViewHolder { 

     TextView lbl_MessageID, lbl_MessageContent,lbl_TimeAdd,lbl_DateAdd; 

    } 
}

來源

2014-10-12 11:57:47 Shvet

非常感謝您的寶貴意見，但它在'holder.lbl_MessageID.setText（hashmap_Current.get（「id」）。toString（））;'catlog'10-12 15：27：46.229：E/AndroidRuntime（1927）：進程：com.TB.Zdit PID：1927 10-12 15：27：46.229：E/AndroidRuntime（1927）：java.lang.NullPointerException 10-12 15：27：46.229：E/AndroidRuntime（1927）：\t at com.TB.Zdit.JAct_Messages $ messages_Adapter.getView（JAct_Messages.java:254） ' – HamidTB 2014-10-12 12:31:36

已確認;我有兩個小錯誤1：我發送不正確的佈局到類2：我不使用findViewById之前的視圖;謝謝你很多親愛的 – HamidTB 2014-10-12 13:01:19

呵呵呵，歡迎你:) – Shvet 2014-10-12 13:07:04

填充自定義適配器，數組列表和HashMap android上的

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