ExpandableListView(可折叠的列表)
一、ExpandableListView（可折叠的列表）和ListView有很多地方差不多的，使用也差不多，只是他们使用适配器不一样的,ExpandableListView使用的是ExpandableAdapter适配器，常用的有BaseExpandableAdapter和SimpleExpandableAdapter。常用的属性：
android：childDivider：指定各组内部子类表项之间分割线，图片不会完全显示，分割子列表项是一条直线。
android：childIndicator：显示在子列表旁边的Drawable对象，可以是一个图像
android：childIndicatorEnd：子列表项指示符的结束约束位置
android：childIndicatorLeft：子列表项指示符的左边约束位置
android：childIndicatorRight：子列表指示符的右边约束位置
android：childIndicatorStart：子列表指示符的开始约束位置
android：groupIndicator：显示在组列表旁边的Drawable对象，可以是一个图像
android：indicatorEnd：组列表项指示器的结束约束位置
android：indicatorLeft：组列表项指示器的左边约束位置
二、使用例子
adapter：
package com.example.test3;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseExpandableListAdapter;import android.widget.ImageView;import android.widget.TextView;import java.util.ArrayList;import java.util.List;/** * Created by coder-tu on 2016/1/18. */public class MyExpandabedAdapter extends BaseExpandableListAdapter { private Context mContext; private List<String> parentData; private List<ArrayList<Item>> childData; public MyExpandabedAdapter(Context mContext, List<ArrayList<Item>> childData, List<String> parentData) { this.mContext = mContext; this.childData = childData; this.parentData = parentData; } @Override public int getGroupCount() { return parentData.size(); } @Override public int getChildrenCount(int i) { return childData.get(i).size(); } @Override public Object getGroup(int i) { return parentData.get(i); } @Override public Object getChild(int i, int i1) { return childData.get(i).get(i1); } @Override public long getGroupId(int i) { return i; } @Override public long getChildId(int i, int i1) { return i; } @Override public boolean hasStableIds() { return false; } @Override public View getGroupView(int i, boolean b, View view, ViewGroup viewGroup) { ViewHolder1 viewHolder1 = null; if (view == null){ viewHolder1 = new ViewHolder1(); view = LayoutInflater.from(mContext).inflate(R.layout.parent,viewGroup,false); viewHolder1.textView1 = (TextView) view.findViewById(R.id.text1); view.setTag(viewHolder1); }else{ viewHolder1 = (ViewHolder1) view.getTag(); } viewHolder1.textView1.setText(parentData.get(i)); return view; } @Override public View getChildView(int i, int i1, boolean b, View view, ViewGroup viewGroup) { ViewHolder2 viewHolder2 = null; if (view == null){ viewHolder2 = new ViewHolder2(); view = LayoutInflater.from(mContext).inflate(R.layout.item,viewGroup,false); viewHolder2.imageView2 = (ImageView) view.findViewById(R.id.image2); viewHolder2.textView2 = (TextView) view.findViewById(R.id.text2); view.setTag(viewHolder2); } else{ viewHolder2 = (ViewHolder2) view.getTag(); } viewHolder2.imageView2.setImageResource(childData.get(i).get(i1).getId()); viewHolder2.textView2.setText(childData.get(i).get(i1).getContent()); return view; } @Override public boolean isChildSelectable(int i, int i1) { return true; } class ViewHolder1{ public TextView textView1; } class ViewHolder2{ public ImageView imageView2; public TextView textView2; }}
布局文件
Java文件
package com.example.test3;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.widget.ExpandableListView;import android.widget.Toast;import java.util.ArrayList;import java.util.List;public class MainActivity extends Activity{ private ExpandableListView expandableListView; private List<String> parentData; private List<ArrayList<Item>> childData; private MyExpandabedAdapter adapter; @Override protected void onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); expandableListView = (ExpandableListView) findViewById(R.id.expandableListView); parentData = new ArrayList<>(); parentData.add(new String("父母1")); parentData.add(new String("父母2")); parentData.add(new String("父母3"));// 给父母1准备数据 ArrayList<Item> arrayList1 = new ArrayList<>(); arrayList1.add(new Item(R.mipmap.ic_launcher,"父母1--孩子1")); arrayList1.add(new Item(R.mipmap.ic_launcher,"父母1--孩子2")); arrayList1.add(new Item(R.mipmap.ic_launcher,"父母1--孩子3"));// 给父母2准备数据 ArrayList<Item> arrayList2 = new ArrayList<>(); arrayList2.add(new Item(R.mipmap.ic_launcher,"父母2--孩子1")); arrayList2.add(new Item(R.mipmap.ic_launcher,"父母2--孩子2")); arrayList2.add(new Item(R.mipmap.ic_launcher,"父母2--孩子3"));// 给父母3准备数据 ArrayList<Item> arrayList3 = new ArrayList<>(); arrayList3.add(new Item(R.mipmap.ic_launcher,"父母3--孩子1")); arrayList3.add(new Item(R.mipmap.ic_launcher,"父母3--孩子2")); arrayList3.add(new Item(R.mipmap.ic_launcher,"父母3--孩子3")); childData = new ArrayList<>(); childData.add(arrayList1); childData.add(arrayList2); childData.add(arrayList3); adapter = new MyExpandabedAdapter(MainActivity.this,childData,parentData); expandableListView.setAdapter(adapter); expandableListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() { @Override public boolean onChildClick(ExpandableListView parent, View children, int parentPosition, int childPosition, long id) { Toast.makeText(MainActivity.this,"你好",Toast.LENGTH_LONG).show(); return false; } }); }}
效果图：
