为ExpandableListView中的每个组添加一个按钮

Question

我正在使用ExpandableListView以及从我获得的数据生成的组项和子项。现在我需要在每个生成的组的底部使用一个onClickListener按钮，该按钮调用一个函数，该函数必须知道该按钮所属的组。

它添加到我的list_group.xml布局文件将增加对样本数据标题 -Header按钮并将其添加到我的list_item.xml将它添加到每一个的样本数据 -TextView元素。

这是我第一个使用Android Studio的项目，我试图解决这个问题。

这里是how the list looks like
我尝试添加的按钮，其按钮产品的屏幕截图。

这是我的函数来填充数据列表：

private void prepareListData(ccyPair[] ccyPairs) { 
      listDataHeader = new ArrayList<String>(); 
      listDataChild = new HashMap<String, List<String>>(); 
      int counter = 0; 
      // Adding child data 
      for (ccyPair p : ccyPairs){ 
       listDataHeader.add("Sample Data Title"); 
       List<String> tempExpInfo = new ArrayList<String>(); 
       tempExpInfo.add("Sample data"); 
       tempExpInfo.add("Sample data"); 
       tempExpInfo.add("Sample data"); 
       tempExpInfo.add("Sample data"); 
       tempExpInfo.add("Sample data"); 
       tempExpInfo.add("Sample data"); 
       tempExpInfo.add("BUTTON"); 
       listDataChild.put(listDataHeader.get(counter), tempExpInfo); 
       counter++; 
      } 
     } 

list_group.xml文件：

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:orientation="vertical" 
    android:padding="8dp" 
    android:background="@color/colorExpandableList"> 


    <TextView 
     android:id="@+id/lblListHeader" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:paddingLeft="?android:attr/expandableListPreferredItemPaddingLeft" 
     android:textSize="17dp" 
     android:paddingTop="10dp" 
     android:paddingBottom="10dp" 
     android:background="@color/colorExpandableList" 
     android:textColor="#2282c1" 
     android:layout_alignParentTop="true"/> 

</RelativeLayout> 

list_item.xml文件：

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:background="@color/colorExpandableList"><![CDATA[ 
    android:orientation="vertical" > 



    ]]> 

    <TextView 
     android:id="@+id/lblListItem" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:background="@color/colorExpandableList" 
     android:paddingBottom="5dp" 
     android:paddingLeft="?android:attr/expandableListPreferredChildPaddingLeft" 
     android:paddingTop="5dp" 
     android:textSize="17dip" /> 


</LinearLayout> 

而ExpandableListAdapter

public class ExpandableListAdapter extends BaseExpandableListAdapter { 

    private Context _context; 
    private List<String> _listDataHeader; // header titles 
    // child data in format of header title, child title 
    private HashMap<String, List<String>> _listDataChild; 

    public ExpandableListAdapter(Context context, List<String> listDataHeader, HashMap<String, List<String>> listChildData) { 
     this._context = context; 
     this._listDataHeader = listDataHeader; 
     this._listDataChild = listChildData; 
    } 

    @Override 
    public Object getChild(int groupPosition, int childPosititon) { 
     return this._listDataChild.get(this._listDataHeader.get(groupPosition)) 
       .get(childPosititon); 
    } 

    @Override 
    public long getChildId(int groupPosition, int childPosition) { 
     return childPosition; 
    } 

    @Override 
    public View getChildView(int groupPosition, final int childPosition, 
          boolean isLastChild, View convertView, ViewGroup parent) { 

     final String childText = (String) getChild(groupPosition, childPosition); 

     if (convertView == null) { 
      LayoutInflater infalInflater = (LayoutInflater) this._context 
        .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      convertView = infalInflater.inflate(R.layout.list_item, null); 
     } 

     TextView txtListChild = (TextView) convertView 
       .findViewById(R.id.lblListItem); 

     txtListChild.setText(childText); 
     return convertView; 
    } 

    @Override 
    public int getChildrenCount(int groupPosition) { 
     return this._listDataChild.get(this._listDataHeader.get(groupPosition)) 
       .size(); 
    } 

    @Override 
    public Object getGroup(int groupPosition) { 
     return this._listDataHeader.get(groupPosition); 
    } 

    @Override 
    public int getGroupCount() { 
     return this._listDataHeader.size(); 
    } 

    @Override 
    public long getGroupId(int groupPosition) { 
     return groupPosition; 
    } 

    @Override 
    public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { 
     String headerTitle = (String) getGroup(groupPosition); 
     if (convertView == null) { 
      LayoutInflater infalInflater = (LayoutInflater) this._context 
        .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      convertView = infalInflater.inflate(R.layout.list_group, null); 
     } 

     TextView lblListHeader = (TextView) convertView 
       .findViewById(R.id.lblListHeader); 
     lblListHeader.setTypeface(null, Typeface.BOLD); 
     lblListHeader.setText(headerTitle); 

     return convertView; 
    } 

    @Override 
    public boolean hasStableIds() { 
     return false; 
    } 

    @Override 
    public boolean isChildSelectable(int groupPosition, int childPosition) { 
     return true; 
    } 
} 

Answer 1

getChildView（）方法是你想看看

第一种选择：

在getChildView（）方法你必须区分哪一个竞争你想膨胀。

if(isLastChild){ 
    convertView = Inflater.inflate(R.layout.list_item_with_button, null); 
} else { 
    convertView = Inflater.inflate(R.layout.list_item, null); 
} 

对于最后一个孩子，您创建了一个包含按钮组件的list_item_with_button.xml。然后，您可以检查isLastChild布尔标志来扩充这个新的布局，以获得最后一个位置的按钮。

第二个选项：您可以编辑现有list_item.xml和

View button = convertView.findViewById(R.id.myButton); 
if(isLastChild){ 
    v.setVisibility(View.VISIBLE); 
} else { 
    v.setVisibility(View.GONE); 
}