ExpandableListView的使用

1.定义父视图layout_parent.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="match_parent" android:layout_height="match_parent">
    <TextView
        android:id="@+id/parent_textview"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:layout_gravity="center"
        android:gravity="center" />
</LinearLayout>

2.定义子视图layout_children.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="vertical" >
    <TextView
        android:id="@+id/second_textview"
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:layout_gravity="center"
        android:gravity="center" />
</LinearLayout>

3.定义继承BaseExpandableListAdapter的ViewAdapter，并实现相应的方法

package com.gst.user.application;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.BaseExpandableListAdapter;
import android.widget.TextView;

import java.util.List;
import java.util.Map;

/**
 * Created by user on 1/20/16.
 */
public class ViewAdapter extends BaseExpandableListAdapter {

    private Context mContext;
    private List<String> mParent;
    private Map<String,List<String>> mData;
    private LayoutInflater mLayoutInflater;

    public ViewAdapter(Context mContext, List<String> mParent, Map<String, List<String>> mData) {
        this.mContext = mContext;
        this.mParent = mParent;
        this.mData = mData;
        mLayoutInflater=(LayoutInflater)mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    @Override
    public int getGroupCount() {
        return mParent.size();
    }

    @Override
    public int getChildrenCount(int groupPosition) {
        return mData.get(mParent.get(groupPosition)).size();
    }


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

    @Override
    public Object getChild(int groupPosition, int childPosition) {
        return mData.get(mParent.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;
    }

    //设置父item组件
    @Override
    public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
        if (convertView == null) {
            convertView=mLayoutInflater.inflate(R.layout.layout_parent,null);
        }
        TextView textView= (TextView) convertView.findViewById(R.id.parent_textview);
        textView.setText(mParent.get(groupPosition));
        return convertView;
    }

    //设置子item的组件
    @Override
    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
        if (convertView == null) {
            convertView=mLayoutInflater.inflate(R.layout.layout_children,null);
        }
        TextView textView= (TextView) convertView.findViewById(R.id.second_textview);
        textView.setText(mData.get(mParent.get(groupPosition)).get(childPosition));
        return convertView;
    }

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

4.在主工程中添加数据，实例化ViewAdapter，绑定ExpandableListView

package com.gst.user.application;

import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.ExpandableListView;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class ExpandableListViewActivity extends AppCompatActivity {

    ExpandableListView expandableListView;
    Map<String,List<String>> mData;
    List parent;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_expandable_list_view);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
            }
        });

        initData();

        expandableListView=(ExpandableListView)findViewById(R.id.expandableListView);
        ViewAdapter adapter=new ViewAdapter(this,parent,mData);
        expandableListView.setAdapter(adapter);
    }

    // 初始化数据
    public void initData() {
        parent = new ArrayList<String>();
        parent.add("parent1");
        parent.add("parent2");
        parent.add("parent3");

        mData = new HashMap<String, List<String>>();

        List<String> list1 = new ArrayList<String>();
        list1.add("child1-1");
        list1.add("child1-2");
        list1.add("child1-3");
        mData.put("parent1", list1);

        List<String> list2 = new ArrayList<String>();
        list2.add("child2-1");
        list2.add("child2-2");
        list2.add("child2-3");
        mData.put("parent2", list2);

        List<String> list3 = new ArrayList<String>();
        list3.add("child3-1");
        list3.add("child3-2");
        list3.add("child3-3");
        mData.put("parent3", list3);
    }

}