吳裕雄--天生自然ANDROID開發學習：2.5.5 ExpandableListView(可摺疊列表)的基本使用
阿新 • • 發佈：2020-08-29
1.相關屬性 android:childDivider：指定各組內子類表項之間的分隔條，圖片不會完全顯示， 分離子列表項的是一條直線 android:childIndicator：顯示在子列表旁邊的Drawable物件，可以是一個影象 android:childIndicatorEnd：子列表項指示符的結束約束位置 android:childIndicatorLeft：子列表項指示符的左邊約束位置 android:childIndicatorRight：子列表項指示符的右邊約束位置 android:childIndicatorStart：子列表項指示符的開始約束位置 android:groupIndicator：顯示在組列表旁邊的Drawable物件，可以是一個影象 android:indicatorEnd：組列表項指示器的結束約束位置 android:indicatorLeft：組列表項指示器的左邊約束位置 android:indicatorRight：組列表項指示器的右邊約束位置 android:indicatorStart：組列表項指示器的開始約束位置
2.實現ExpandableAdapter的三種方式 1. 擴充套件BaseExpandableListAdpter實現ExpandableAdapter。 2. 使用SimpleExpandableListAdpater將兩個List集合包裝成ExpandableAdapter 3. 使用simpleCursorTreeAdapter將Cursor中的資料包裝成SimpleCuroTreeAdapter 本節示例使用的是第一個，擴充套件BaseExpandableListAdpter
下面我們就來實現上圖的這個效果：
核心是重寫BaseExpandableListAdpter，其實和之前寫的普通的BaseAdapter是類似的， 但是BaseExpandableListAdpter則分成了兩部分：組和子列表
另外，有一點要注意的是，重寫isChildSelectable()方法需要返回true，不然不會觸發 子Item的點選事件！下面我們來寫寫：
首先是組和子列表的佈局：
item_exlist_group.xml：
<?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="match_parent"
android:orientation="horizontal"
android:padding="5dp">
<TextView
android:id="@+id/tv_group_name"
android:layout_width="match_parent"
android:layout_height="56dp"
android:gravity="center_vertical"
android:paddingLeft="30dp"
android:text="AP"
android:textStyle="bold"
android:textSize="20sp" />
</LinearLayout>
item_exlist_item.xml：
<?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="match_parent"
android:orientation="horizontal"
android:padding="5dp"
android:background="#6BBA79">
<ImageView
android:id="@+id/img_icon"
android:layout_width="48dp"
android:layout_height="48dp"
android:src="@mipmap/iv_lol_icon1"
android:focusable="false"/>
<TextView
android:id="@+id/tv_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="15dp"
android:layout_marginTop="15dp"
android:focusable="false"
android:text="提莫"
android:textSize="18sp" />
</LinearLayout>
然後是自定義的Adapter類：
MyBaseExpandableListAdapter.java：
/**
* Created by Jay on 2015/9/25 0025.
*/
public class MyBaseExpandableListAdapter extends BaseExpandableListAdapter {
private ArrayList<Group> gData;
private ArrayList<ArrayList<Item>> iData;
private Context mContext;
public MyBaseExpandableListAdapter(ArrayList<Group> gData,ArrayList<ArrayList<Item>> iData, Context mContext) {
this.gData = gData;
this.iData = iData;
this.mContext = mContext;
}
@Override
public int getGroupCount() {
return gData.size();
}
@Override
public int getChildrenCount(int groupPosition) {
return iData.get(groupPosition).size();
}
@Override
public Group getGroup(int groupPosition) {
return gData.get(groupPosition);
}
@Override
public Item getChild(int groupPosition, int childPosition) {
return iData.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;
}
//取得用於顯示給定分組的檢視. 這個方法僅返回分組的檢視物件
@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
ViewHolderGroup groupHolder;
if(convertView == null){
convertView = LayoutInflater.from(mContext).inflate(
R.layout.item_exlist_group, parent, false);
groupHolder = new ViewHolderGroup();
groupHolder.tv_group_name = (TextView) convertView.findViewById(R.id.tv_group_name);
convertView.setTag(groupHolder);
}else{
groupHolder = (ViewHolderGroup) convertView.getTag();
}
groupHolder.tv_group_name.setText(gData.get(groupPosition).getgName());
return convertView;
}
//取得顯示給定分組給定子位置的資料用的檢視
@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
ViewHolderItem itemHolder;
if(convertView == null){
convertView = LayoutInflater.from(mContext).inflate(
R.layout.item_exlist_item, parent, false);
itemHolder = new ViewHolderItem();
itemHolder.img_icon = (ImageView) convertView.findViewById(R.id.img_icon);
itemHolder.tv_name = (TextView) convertView.findViewById(R.id.tv_name);
convertView.setTag(itemHolder);
}else{
itemHolder = (ViewHolderItem) convertView.getTag();
}
itemHolder.img_icon.setImageResource(iData.get(groupPosition).get(childPosition).getiId());
itemHolder.tv_name.setText(iData.get(groupPosition).get(childPosition).getiName());
return convertView;
}
//設定子列表是否可選中
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
private static class ViewHolderGroup{
private TextView tv_group_name;
}
private static class ViewHolderItem{
private ImageView img_icon;
private TextView tv_name;
}
}
PS：儲存子列表的資料不一定要用ArrayList<ArrayList>這種，根據自己的需求 定義~
最後是MainActivity的佈局以及Java程式碼：
佈局檔案:activity_main.xml：
<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:padding="5dp"
tools:context=".MainActivity">
<ExpandableListView
android:id="@+id/exlist_lol"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:childDivider="#E02D2F"/>
</RelativeLayout>
MainActivity.java：
public class MainActivity extends AppCompatActivity {
private ArrayList<Group> gData = null;
private ArrayList<ArrayList<Item>> iData = null;
private ArrayList<Item> lData = null;
private Context mContext;
private ExpandableListView exlist_lol;
private MyBaseExpandableListAdapter myAdapter = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mContext = MainActivity.this;
exlist_lol = (ExpandableListView) findViewById(R.id.exlist_lol);
//資料準備
gData = new ArrayList<Group>();
iData = new ArrayList<ArrayList<Item>>();
gData.add(new Group("AD"));
gData.add(new Group("AP"));
gData.add(new Group("TANK"));
lData = new ArrayList<Item>();
//AD組
lData.add(new Item(R.mipmap.iv_lol_icon3,"劍聖"));
lData.add(new Item(R.mipmap.iv_lol_icon4,"德萊文"));
lData.add(new Item(R.mipmap.iv_lol_icon13,"男槍"));
lData.add(new Item(R.mipmap.iv_lol_icon14,"韋魯斯"));
iData.add(lData);
//AP組
lData = new ArrayList<Item>();
lData.add(new Item(R.mipmap.iv_lol_icon1, "提莫"));
lData.add(new Item(R.mipmap.iv_lol_icon7, "安妮"));
lData.add(new Item(R.mipmap.iv_lol_icon8, "天使"));
lData.add(new Item(R.mipmap.iv_lol_icon9, "澤拉斯"));
lData.add(new Item(R.mipmap.iv_lol_icon11, "狐狸"));
iData.add(lData);
//TANK組
lData = new ArrayList<Item>();
lData.add(new Item(R.mipmap.iv_lol_icon2, "諾手"));
lData.add(new Item(R.mipmap.iv_lol_icon5, "德邦"));
lData.add(new Item(R.mipmap.iv_lol_icon6, "奧拉夫"));
lData.add(new Item(R.mipmap.iv_lol_icon10, "龍女"));
lData.add(new Item(R.mipmap.iv_lol_icon12, "狗熊"));
iData.add(lData);
myAdapter = new MyBaseExpandableListAdapter(gData,iData,mContext);
exlist_lol.setAdapter(myAdapter);
//為列表設定點選事件
exlist_lol.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
@Override
public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
Toast.makeText(mContext, "你點選了：" + iData.get(groupPosition).get(childPosition).getiName(), Toast.LENGTH_SHORT).show();
return true;
}
});
}
}
官方API：ExpandableListView