要自定义ExpandableListView，你可以按照以下步骤进行：
ExpandableListView创建一个布局文件。这个文件将定义每个子项和组头的布局。例如，你可以创建一个名为list_item_group.xml的文件来定义组头的布局，以及一个名为list_item_child.xml的文件来定义子项的布局。ExpandableListView的数据。你可以继承BaseExpandableListAdapter类来实现自定义适配器。在适配器中，你需要实现getGroupView和getChildView方法来分别返回组头和子项的视图。同时，你还需要实现getGroupId、getGroupCount、getChildrenCount、getChildId和hasStableIds等方法来管理组和子项的数据。ExpandableListView。你可以通过调用setAdapter方法来实现这一点。下面是一个简单的示例代码，展示了如何自定义ExpandableListView：
// 创建布局文件 // list_item_group.xml <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical"> <TextView android:id="@+id/group_title" android:layout_width="match_parent" android:layout_height="wrap_content" android:textAppearance="?android:attr/textAppearanceListItemSmall" /> </LinearLayout> // list_item_child.xml <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" android:paddingLeft="40dp"> <TextView android:id="@+id/child_title" android:layout_width="match_parent" android:layout_height="wrap_content" android:textAppearance="?android:attr/textAppearanceListItemSmall" /> </LinearLayout> // 自定义适配器 public class CustomExpandableListAdapter extends BaseExpandableListAdapter { private Context context; private List<String> groupList; private List<List<String>> childList; public CustomExpandableListAdapter(Context context, List<String> groupList, List<List<String>> childList) { this.context = context; this.groupList = groupList; this.childList = childList; } @Override public int getGroupCount() { return groupList.size(); } @Override public int getChildrenCount(int groupPosition) { return childList.get(groupPosition).size(); } @Override public Object getGroup(int groupPosition) { return groupList.get(groupPosition); } @Override public Object getChild(int groupPosition, int childPosition) { return childList.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 true; } @Override public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { if (convertView == null) { LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); convertView = inflater.inflate(R.layout.list_item_group, null); } TextView groupTitle = convertView.findViewById(R.id.group_title); groupTitle.setText(groupList.get(groupPosition)); return convertView; } @Override public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { if (convertView == null) { LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); convertView = inflater.inflate(R.layout.list_item_child, null); } TextView childTitle = convertView.findViewById(R.id.child_title); childTitle.setText(childList.get(groupPosition).get(childPosition)); return convertView; } @Override public boolean isChildSelectable(int groupPosition, int childPosition) { return true; } } // 在Activity中使用自定义ExpandableListView public class MainActivity extends AppCompatActivity { private ExpandableListView expandableListView; private CustomExpandableListAdapter adapter; private List<String> groupList; private List<List<String>> childList; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); expandableListView = findViewById(R.id.expandable_list_view); // 初始化数据和适配器 groupList = new ArrayList<>(); childList = new ArrayList<>(); // 添加组和子项数据 groupList.add("Group 1"); groupList.add("Group 2"); groupList.add("Group 3"); List<String> child1 = new ArrayList<>(); child1.add("Child 1.1"); child1.add("Child 1.2"); List<String> child2 = new ArrayList<>(); child2.add("Child 2.1"); child2.add("Child 2.2"); List<String> child3 = new ArrayList<>(); child3.add("Child 3.1"); child3.add("Child 3.2"); childList.add(child1); childList.add(child2); childList.add(child3); // 设置适配器 adapter = new CustomExpandableListAdapter(this, groupList, childList); expandableListView.setAdapter(adapter); } } 以上示例代码展示了如何创建自定义布局文件、自定义适配器和在Activity中使用自定义ExpandableListView。你可以根据自己的需求修改和扩展这些代码。
