BaseExpandableListAdapter的用法

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MainActivity.java

package com.example.listviewdemo;import java.util.ArrayList;import java.util.List;import android.app.Activity;import android.app.ExpandableListActivity;import android.os.Bundle;import android.view.Gravity;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.ViewGroup;import android.widget.AbsListView;import android.widget.BaseExpandableListAdapter;import android.widget.ExpandableListView;import android.widget.ExpandableListView.OnChildClickListener;import android.widget.ListAdapter;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends Activity {    private List<String> groupdate;//定义组    private List<List<String>> childrendate;//定义组中的子条目    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        ExpandableListView expandable = (ExpandableListView)findViewById(R.id.expandableListView1);        groupdate = new ArrayList<String>();        groupdate.add("Java");        groupdate.add("Android");        groupdate.add("IOS");        childrendate = new ArrayList<List<String>>();        List<String> child1 = new ArrayList<String>();        child1.add("java基础");        child1.add("java大全");        child1.add("解析java");        childrendate.add(child1);        List<String> child2 = new ArrayList<String>();        child2.add("Android基础");        child2.add("Android大全");        child2.add("解析Android");        childrendate.add(child2);        List<String> child3 = new ArrayList<String>();        child3.add("IOS基础");        child3.add("IOS大全");        child3.add("解析IOS");        childrendate.add(child3);        expandable.setAdapter(new ExpandableAdapter());        /*expandable.setOnChildClickListener(new OnChildClickListener() {            @Override            public boolean onChildClick(ExpandableListView parent, View v,                    int groupPosition, int childPosition, long id) {                // TODO Auto-generated method stub                Toast.makeText(MainActivity.this, "你点击了"+groupPosition+","+ childPosition,Toast.LENGTH_SHORT).show();                return false;            }        });*/    }class ExpandableAdapter extends BaseExpandableListAdapter {        @Override        public Object getChild(int groupPosition, int childPosition) {            return childrendate.get(groupPosition).get(childPosition);        }        @Override        public long getChildId(int groupPosition, int childPosition) {            return 0;        }        @Override        public View getChildView(int groupPosition, int childPosition,                boolean isLastChild, View convertView, ViewGroup parent) {            TextView myText = null;            if (convertView != null) {                myText = (TextView) convertView;                myText.setText(childrendate.get(groupPosition).get(                        childPosition));            } else {                AbsListView.LayoutParams layoutParams = new AbsListView.LayoutParams(                        ViewGroup.LayoutParams.FILL_PARENT, 50);                myText = new TextView(MainActivity.this);                myText.setLayoutParams(layoutParams);                myText.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);                myText.setPadding(50, 0, 0, 0);                myText.setText(childrendate.get(groupPosition).get(                        childPosition));            }            return myText;        }        @Override        public int getChildrenCount(int groupPosition) {            return childrendate.get(groupPosition).size();        }        @Override        public Object getGroup(int groupPosition) {            return childrendate.get(groupPosition);        }        @Override        public int getGroupCount() {            return childrendate.size();        }        @Override        public long getGroupId(int groupPosition) {            return 0;        }        @Override        public View getGroupView(int groupPosition, boolean isExpanded,                View convertView, ViewGroup parent) {            TextView myText = null;            if (convertView != null) {                myText = (TextView) convertView;                myText.setText(groupdate.get(groupPosition));            } else {                myText = new TextView(MainActivity.this);                AbsListView.LayoutParams layoutParams = new AbsListView.LayoutParams(                        ViewGroup.LayoutParams.FILL_PARENT, 50);                myText.setLayoutParams(layoutParams);                myText.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);                myText.setPadding(50, 0, 0, 0);                myText.setText(groupdate.get(groupPosition));            }            return myText;        }        @Override        public boolean hasStableIds() {            return false;        }        @Override        public boolean isChildSelectable(int groupPosition, int childPosition) {            return true;        }    }}

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:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="com.example.listviewdemo.MainActivity" >    <ExpandableListView        android:id="@+id/expandableListView1"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_alignParentRight="true" >    </ExpandableListView></RelativeLayout>

这里写图片描述

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