ExpandableListView
的分組標題樣式可以通過自定義 GroupHeaderLayout
來實現。以下是一個簡單的示例,展示了如何自定義分組標題的樣式:
GroupHeaderLayout
:<?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="vertical"
android:padding="8dp">
<TextView
android:id="@+id/group_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceListItemSmall"
android:gravity="center_vertical"
android:textColor="@color/colorPrimary"
android:textSize="16sp" />
</LinearLayout>
在這個示例中,我們創建了一個包含 TextView
的線性布局作為分組標題。你可以根據需要自定義 TextView
的樣式,例如設置文本顏色、大小、字體等。
ExpandableListView
中使用自定義的 GroupHeaderLayout
:<ExpandableListView
android:id="@+id/expandableListView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import androidx.appcompat.app.AppCompatActivity;
import android.widget.ArrayAdapter;
import android.widget.LinearLayout;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class MainActivity extends AppCompatActivity {
private ExpandableListView expandableListView;
private List<String> groupList;
private Map<String, List<String>> childListMap;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
expandableListView = findViewById(R.id.expandableListView);
// 初始化數據
groupList = new ArrayList<>();
childListMap = new HashMap<>();
// 添加分組
groupList.add("Group 1");
groupList.add("Group 2");
groupList.add("Group 3");
// 添加子項
List<String> group1Items = new ArrayList<>();
group1Items.add("Item 1.1");
group1Items.add("Item 1.2");
childListMap.put(groupList.get(0), group1Items);
List<String> group2Items = new ArrayList<>();
group2Items.add("Item 2.1");
group2Items.add("Item 2.2");
childListMap.put(groupList.get(1), group2Items);
List<String> group3Items = new ArrayList<>();
group3Items.add("Item 3.1");
group3Items.add("Item 3.2");
childListMap.put(groupList.get(2), group3Items);
// 設置適配器
expandableListView.setAdapter(new MyExpandableListAdapter(this, groupList, childListMap));
}
}
ExpandableListAdapter
:import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.TextView;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class MyExpandableListAdapter extends BaseExpandableListAdapter {
private Context context;
private List<String> groupList;
private Map<String, List<String>> childListMap;
public MyExpandableListAdapter(Context context, List<String> groupList, Map<String, List<String>> childListMap) {
this.context = context;
this.groupList = groupList;
this.childListMap = childListMap;
}
@Override
public int getGroupCount() {
return groupList.size();
}
@Override
public int getChildrenCount(int groupPosition) {
return childListMap.get(groupList.get(groupPosition)).size();
}
@Override
public Object getGroup(int groupPosition) {
return groupList.get(groupPosition);
}
@Override
public Object getChild(int groupPosition, int childPosition) {
return childListMap.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 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.group_header_layout, parent, false);
}
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(android.R.layout.simple_list_item_1, parent, false);
}
TextView childText = convertView.findViewById(android.R.id.text1);
childText.setText(childListMap.get(groupList.get(groupPosition)).get(childPosition));
return convertView;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
}
在這個示例中,我們創建了一個自定義的 ExpandableListAdapter
,并在 getGroupView
方法中設置了分組標題的布局。這樣,ExpandableListView
就會使用我們自定義的分組標題樣式了。