如何在Android ExpandableListView中为类别标题添加标题图标

这是我的可扩展列表适配器：

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

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

public Object getChildrenID(int groupPosition, int childPosititon) {
    return this._listDataChildID.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;
}

}

---

它实际上为所有组设置了相同的groupindicator，但是我希望不同的组有不同的图标。如何更改适配器。

您可以在ListView上设置的组指示器将始终应用于所有元素。因此，要获得您想要的行为，您必须自定义列表项的布局以复制效果。将ImageView添加到列表项中，并以编程方式为每个列表项设置图像。

首先定义可展开的listview

    <ExpandableListView
    android:id="@+id/left_drawer"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="start"
    android:background="#e5e5e5"
    android:choiceMode="singleChoice"
    android:divider="#000"
    android:dividerHeight="1dp" />

<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"
android:clickable="true"
android:orientation="vertical"
android:paddingLeft="40dp"
tools:context=".MainActivity" 
>
 <ImageView 
    android:layout_width="35dp"
    android:layout_height="35dp"
    android:id="@+id/imgicon"

    />

<TextView
    android:id="@+id/textViewsub"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:drawablePadding="5dp"
    android:text="@string/hello_world"
    android:textSize="14sp"
    android:textStyle="bold"
    android:textColor="#000"
    android:layout_centerVertical="true"
    android:layout_toRightOf="@+id/imgicon"
 >
</TextView>


<View
    android:layout_width="match_parent"
    android:layout_height="1dp"
    android:background="@android:color/black" />

}

现在，我们只需要相应地使用这个类

使用此类初始化组标题和图标

然后在

getGroupView（）

方法中执行以下操作：

final groups group = (groups) getGroup(groupPosition);

textviewsub.setText（group.string）；

---

icon_img.setImageBitmap（group.bitmap）

在上述代码中，您应该通过编程设置需要在每个组中显示的图像图标是的，但是您可以演示如何执行此操作，因为标题是从getGroupView获取参数groupPosition，这意味着我必须再次向适配器中的每个函数添加参数，还是有更好的方法执行此操作：（我仍然不知道如何修复它，因为我将在jsonformat中拥有来自Web服务的图像设置标题很简单，因为这是字符串我如何设置位图您是否保存从Web服务接收的图像？

public class Group {

public String string;
public Bitmap bitmap;
public final List<String> children = new ArrayList<String>();

public Group(String string,Bitmap bitmap){
    this.string = string;
    this.bitmap = bitmap;
}

final groups group = (groups) getGroup(groupPosition);