扩展列表时,在ExpandedListView中更改文本颜色

扩展列表时，在ExpandedListView中更改文本颜色，可以通过自定义适配器来实现。以下是一个简单的示例：

创建一个自定义布局文件，例如list_item.xml，并在其中定义要显示的文本视图。

<?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">

   <TextView
        android:id="@+id/text_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Text"
        android:textColor="@android:color/black" />

</LinearLayout>

创建一个自定义适配器，例如CustomExpandableListAdapter，并在其中更新文本颜色。

public class CustomExpandableListAdapter extends BaseExpandableListAdapter {

    private Context context;
    private List<String> groupList;
    private Map<String, List<String>> childList;

    public CustomExpandableListAdapter(Context context, List<String> groupList, Map<String, 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(groupList.get(groupPosition)).size();
    }

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

    @Override
    public Object getChild(int groupPosition, int childPosition) {
        return childList.get(groupList.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) {
        if (convertView == null) {
            LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = inflater.inflate(R.layout.list_group, parent, false);
        }

        TextView textView = convertView.findViewById(R.id.text_view);
        textView.setText(getGroup(groupPosition).toString());

        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, parent, false);
        }

        TextView textView = convertView.findViewById(R.id.text_view);
        textView.setText(getChild(groupPosition, childPosition).toString());
        textView.setTextColor(Color.RED); // 更改文本颜色

        return convertView;
    }

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

在主活动中，使用自定义适配器填充ExpandedListView。

public class MainActivity extends AppCompatActivity {

    private ExpandableListView expandableListView;
    private CustomExpandableListAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        expandableListView = findViewById(R.id.expandable_list_view);

        List<String> groupList = new ArrayList<>();
        groupList.add("Group 1");
        groupList.add("Group 2");
        groupList.add("Group 3");

        Map<String, List<String>> childList = new HashMap<>();
        childList.put("Group 1", Arrays.asList("Item 1", "Item 2", "Item 3"));
        childList.put("Group 2", Arrays.asList("Item 1", "Item 2", "Item 3"));
        childList.put("Group 3", Arrays.asList("Item 1", "Item 2", "Item 3"));

        adapter = new CustomExpandableListAdapter(this, groupList, childList);
        expandableListView.setAdapter(adapter);
    }
}

这样，在ExpandedListView中显示的文本颜色就会更改为红色。