在ExpandableListView中顯示圖片需要以下幾個步驟：

1. 首先，確保你已經將所需的圖片添加到項目的資源文件夾（res/drawable）中。

2. 創建一個自定義的布局文件，例如list_item_image.xml，用于定義列表項的布局。在這個布局文件中，添加ImageView和其他需要的控件。例如：

<?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="wrap_content"
    android:orientation="horizontal">

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="48dp"
        android:layout_height="48dp"
        android:src="@drawable/your_image" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="16dp"
        android:text="Your Text" />

</LinearLayout>

請確保將your_image替換為實際的圖片資源名稱。

3. 創建一個自定義的適配器類，繼承自BaseAdapter。在這個類中，重寫getView()方法，用于設置列表項的布局和數據。例如：

public class ImageExpandableListAdapter extends BaseAdapter {

    private Context context;
    private List<String> groupHeaders;
    private List<List<String>> childItems;
    private int resource;

    public ImageExpandableListAdapter(Context context, List<String> groupHeaders, List<List<String>> childItems, int resource) {
        this.context = context;
        this.groupHeaders = groupHeaders;
        this.childItems = childItems;
        this.resource = resource;
    }

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

    @Override
    public int getChildrenCount(int groupPosition) {
        return childItems.get(groupPosition).size();
    }

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

    @Override
    public Object getChild(int groupPosition, int childPosition) {
        return childItems.get(groupPosition).get(childPosition);
    }

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

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

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

    @Override
    public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
        String headerTitle = (String) getGroup(groupPosition);
        if (convertView == null) {
            LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = inflater.inflate(resource, null);
        }

        TextView textView = (TextView) convertView.findViewById(R.id.textView);
        textView.setText(headerTitle);

        return convertView;
    }

    @Override
    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
        final String childText = (String) getChild(groupPosition, childPosition);
        if (convertView == null) {
            LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = inflater.inflate(resource, null);
        }

        ImageView imageView = (ImageView) convertView.findViewById(R.id.imageView);
        imageView.setImageResource(R.drawable.your_image); // 設置圖片資源

        return convertView;
    }

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

請確保將your_image替換為實際的圖片資源名稱。

4. 在你的Activity或Fragment中，設置ExpandableListView的適配器為自定義的適配器，并傳入相應的參數。例如：

ExpandableListView expandableListView = findViewById(R.id.expandableListView);
List<String> groupHeaders = new ArrayList<>();
List<List<String>> childItems = new ArrayList<>();

// 添加分組數據和子項數據
// ...

ImageExpandableListAdapter adapter = new ImageExpandableListAdapter(this, groupHeaders, childItems, R.layout.list_item_image);
expandableListView.setAdapter(adapter);

現在，你應該可以在ExpandableListView中看到圖片了。如果需要根據數據動態更改圖片，可以在適配器類的getView()方法中設置ImageView的圖片資源。