在Android中使用BaseAdapter给ListView添加字符串任意值

Question

我一直在互联网上搜索如何使用BaseAdapter在ListView中添加可修改的文本/字符串，但迄今为止没有运气。这就是我想做的，如下所示:

              Item_1      $price1
              Item_2      $price2

上面显示的格式是我希望listView采用的模板形式。Item_1和$price1在第一行，item_2和$price2在第二行。我不想要一个预定义的列表，但是一个列表，用户应该能够添加一个项目连同它的价格，应该能够相应地修改它。

下面是我的代码的一部分，我试图在ToDoAdapter extends BaseAdapter类中使用:

    public View getView(int position, View convertView, ViewGroup parent) {  
           View v = convertView;  
           CompleteListViewHolder viewHolder;  
           if (convertView == null) {  
                LayoutInflater inflater = (LayoutInflater) mContext  
                          .getSystemService(Context.LAYOUT_INFLATER_SERVICE);  
                v = inflater.inflate(R.layout.list_layout, null); 

                viewHolder = new CompleteListViewHolder(v);  
                v.setTag(viewHolder);  
           } else {  
                viewHolder = (CompleteListViewHolder) v.getTag();  
           }  
           viewHolder.mTVItem.setText(mList.get(position));
           viewHolder.mTvItem2.setText(mList.get(position)); 
           return v;  
      }  
 }  
 class CompleteListViewHolder {  
      public TextView mTVItem, mTvItem2;  
      public CompleteListViewHolder(View base) {  
          mTVItem = (TextView) base.findViewById(R.id.listTV);  
          mTvItem2 =  (TextView) base.findViewById(R.id.listTv2);
      }

主要活动:

 @Override  
     protected void onCreate(Bundle savedInstanceState) {  
          super.onCreate(savedInstanceState);  
          setContentView(R.layout.activity_complete_list);
          initViews();  
          mItems = new ArrayList<String>();  
          mListAdapter = new CompleteListAdapter(this, mItems);  
          mCompleteListView.setAdapter(mListAdapter);  
     }  
     private void initViews() {  
          mCompleteListView = (ListView) findViewById(R.id.completeList);  
          mAddItemToList = (Button) findViewById(R.id.addItemToList);  
          mAddItemToList.setOnClickListener(this);  
     }  
     private void addItemsToList() {  
         mListAdapter.notifyDataSetChanged();
     } 
     @Override  
     public void onClick(View v) {  
          switch (v.getId()) {  
          case R.id.addItemToList:  
               addItemsToList();  
               break;  
          }  
     }  

XML布局:

<?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  
   android:layout_width="match_parent"  
   android:layout_height="match_parent"  
   android:orientation="vertical" >
     <TextView
       android:id="@+id/listTV"
       android:layout_width="142dp"
       android:layout_height="60dp"
       android:gravity="center_vertical"
       android:text="Income"
       android:textSize="42sp"
       android:typeface="sans" />
   <TextView
       android:id="@+id/listTv2"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:layout_alignBaseline="@+id/listTV"
       android:layout_alignBottom="@+id/listTV"
       android:layout_marginLeft="45dp"
       android:layout_toRightOf="@+id/listTV"
       android:text="Amount"
       android:textAppearance="?android:attr/textAppearanceLarge" />
 </RelativeLayout>  

XML主活动布局:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  
   xmlns:tools="http://schemas.android.com/tools"  
   android:layout_width="match_parent"  
   android:layout_height="match_parent"  
   tools:context=".CompleteListActivity" >  
   <ListView  
     android:id="@+id/completeList"  
     android:layout_width="match_parent"  
     android:layout_height="match_parent"  
     android:layout_alignParentTop="true"  
     android:layout_marginBottom="80dp" >  
   </ListView>  
   <Button  
     android:id="@+id/addItemToList"  
     android:layout_width="match_parent"  
     android:layout_height="wrap_content"  
     android:layout_alignParentBottom="true"  
     android:layout_margin="10dp"  
     android:text="@string/add_item" />  
 </RelativeLayout>  

感谢您的帮助

Answer 1

按钮通知适配器数据更改了，但实际上数据没有更改。

所以你需要做的是首先修改适配器数据然后调用notifyDataSetChanged()