Android|Android ExpandableListView使用方法案例详解 AndroidExpandableListView使用方法案

一、前言
二、实现的功能
三、具体代码

1、主xml代码
2、父布局xml代码
3、子布局xml代码
4、主activity代码
5、adapter代码

一、前言 “好记性不如烂笔头”，再次验证了这句话是真的很有道理啊，一个月前看了一下ExpandableListView的使用，今天再看居然忘了这个是干啥的了，今天就详细讲解一下ExpandableListView的使用方法，感觉对于二级条目显示功能都可以实现。

二、实现的功能 1、可实现二级列表条目显示功能，具体包括可自定义，父布局和子布局。可实现父布局全部展开和只展开一个功能。

Android|Android ExpandableListView使用方法案例详解

文章图片

三、具体代码
1、主xml代码

2、父布局xml代码

3、子布局xml代码

4、主activity代码

** * Created by fyf on 2019/3/1. * 描述：用于实现ExpandableListView的类，主要功能是实现二级列表条目显示 */public class ExpandableListviewActivity extends BaseActivity {private ExpandableListView expand_list_id; //Model：定义的数据private String[] groups = {"开发部", "人力资源部", "销售部"}; //注意，字符数组不要写成{{"A1,A2,A3,A4"}, {"B1,B2,B3,B4，B5"}, {"C1,C2,C3,C4"}}private String[][] childs = {{"赵珊珊", "钱丹丹", "孙可可", "李冬冬"}, {"周大福", "吴端口", "郑非", "王疯狂"}, {"冯程程", "陈类", "楚哦", "魏王"}}; @Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState); setContentView(R.layout.expandable_list_view); setTitle("ExpandableListView二级下拉",false,""); initView(); }private void initView(){expand_list_id=findViewById(R.id.expand_list_id); ExpandableListviewAdapter adapter=new ExpandableListviewAdapter(this,groups,childs); expand_list_id.setAdapter(adapter); //默认展开第一个数组expand_list_id.expandGroup(0); //关闭数组某个数组，可以通过该属性来实现全部展开和只展开一个列表功能//expand_list_id.collapseGroup(0); expand_list_id.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {@Overridepublic boolean onGroupClick(ExpandableListView expandableListView, View view, int groupPosition, long l) {showToastShort(groups[groupPosition]); return false; }}); //子视图的点击事件expand_list_id.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {@Overridepublic boolean onChildClick(ExpandableListView expandableListView, View view, int groupPosition, int childPosition, long l) {showToastShort(childs[groupPosition][childPosition]); return true; }}); //用于当组项折叠时的通知。expand_list_id.setOnGroupCollapseListener(new ExpandableListView.OnGroupCollapseListener() {@Overridepublic void onGroupCollapse(int groupPosition) {showToastShort("折叠了数据___"+groups[groupPosition]); }}); ////用于当组项折叠时的通知。expand_list_id.setOnGroupExpandListener(new ExpandableListView.OnGroupExpandListener() {@Overridepublic void onGroupExpand(int groupPosition) {showToastShort("展开了数据___"+groups[groupPosition]); }}); }}

5、adapter代码

/** * Created by fyf on 2019/3/1. * 描述：是二级显示列表的adapter */public class ExpandableListviewAdapter extends BaseExpandableListAdapter {//Model：定义的数据private String[] groups; //注意，字符数组不要写成{{"A1,A2,A3,A4"}, {"B1,B2,B3,B4，B5"}, {"C1,C2,C3,C4"}}private String[][] childs; private Context context; public ExpandableListviewAdapter(Context context,String[] groups,String[][] childs){this.context=context; this.groups=groups; this.childs=childs; } @Overridepublic int getGroupCount() {return groups.length; } @Overridepublic int getChildrenCount(int i) {return childs[i].length; } @Overridepublic Object getGroup(int i) {return groups[i]; } @Overridepublic Object getChild(int i, int i1) {return childs[i][i1]; } @Overridepublic long getGroupId(int i) {return i; } @Overridepublic long getChildId(int i, int i1) {return i1; } @Override//分组和子选项是否持有稳定的ID, 就是说底层数据的改变会不会影响到它们public boolean hasStableIds() {return true; } @Override/** * * 获取显示指定组的视图对象 * * @param groupPosition 组位置 * @param isExpanded 该组是展开状态还是伸缩状态，true=展开 * @param convertView 重用已有的视图对象 * @param parent 返回的视图对象始终依附于的视图组 */public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {GroupViewHolder groupViewHolder; if (convertView == null){convertView = LayoutInflater.from(parent.getContext()).inflate(R.layout.expand_parent_item,parent,false); groupViewHolder = new GroupViewHolder(); groupViewHolder.parent_textview_id = convertView.findViewById(R.id.parent_textview_id); groupViewHolder.parent_image = convertView.findViewById(R.id.parent_image); convertView.setTag(groupViewHolder); }else {groupViewHolder = (GroupViewHolder)convertView.getTag(); }groupViewHolder.parent_textview_id.setText(groups[groupPosition]); //如果是展开状态，if (isExpanded){groupViewHolder.parent_image.setImageDrawable(ContextCompat.getDrawable(context,R.drawable.img_arrow_down)); }else{groupViewHolder.parent_image.setImageDrawable(ContextCompat.getDrawable(context,R.drawable.img_arrow_right)); }return convertView; } @Overridepublic View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {ChildViewHolder childViewHolder; if (convertView==null){convertView = LayoutInflater.from(parent.getContext()).inflate(R.layout.expand_chidren_item,parent,false); childViewHolder = new ChildViewHolder(); childViewHolder.chidren_item = (TextView)convertView.findViewById(R.id.chidren_item); convertView.setTag(childViewHolder); }else {childViewHolder = (ChildViewHolder) convertView.getTag(); }childViewHolder.chidren_item.setText(childs[groupPosition][childPosition]); return convertView; } //指定位置上的子元素是否可选中@Overridepublic boolean isChildSelectable(int i, int i1) {return true; }static class GroupViewHolder {TextView parent_textview_id; ImageView parent_image; } static class ChildViewHolder {TextView chidren_item; }}

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