ExpandableListActivity

mainActivity.java

package yb.demo;

import java.util.ArrayList;
import java.util.List;
import android.app.ExpandableListActivity;
import android.os.Bundle;
import android.widget.ExpandableListView;

public class mainActivity extends ExpandableListActivity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        List<String> gl = new ArrayList<String>();
        List<List<String>> cl = new ArrayList<List<String>>();
        gl.add("gr1");
        gl.add("gr2");
        gl.add("gr3");

        List<String> chil1 = new ArrayList<String>();
        chil1.add("c11");
        chil1.add("c12");
        chil1.add("c13");
        chil1.add("c14");
        chil1.add("c15");
        chil1.add("c16");
        chil1.add("c17");
        chil1.add("c18");
        List<String> chil2 = new ArrayList<String>();
        chil2.add("c21");
        chil2.add("c22");
        chil2.add("c23");
        chil2.add("c24");
        chil2.add("c25");
        chil2.add("c26");
        chil2.add("c27");
        chil2.add("c28");
        List<String> chil3 = new ArrayList<String>();
        chil3.add("c31");
        chil3.add("c32");
        chil3.add("c33");
        chil3.add("c34");
        chil3.add("c35");
        chil3.add("c36");
        chil3.add("c37");
        chil3.add("c38");

        cl.add(chil1);
        cl.add(chil2);
        cl.add(chil3);

        adapter e = new adapter(this, gl, cl);

        ExpandableListView expandableListView = getExpandableListView();

        // 设置适配器
        expandableListView.setAdapter(e);
        // 设置组图标 可以使用selector
        expandableListView.setGroupIndicator(getResources().getDrawable(
                R.drawable.away));
        // 设置组图标位置
        expandableListView.setIndicatorBounds(0, 40);
        // 设置子项图标
        expandableListView.setChildIndicator(getResources().getDrawable(
                R.drawable.busy));
        // 设置子项图标位置
        expandableListView.setChildIndicatorBounds(0, 40);
    }
}

adapter.java

package yb.demo;

import java.util.ArrayList;
import java.util.List;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.TextView;

/**
 * @author yubin
 * @version 2012-8-27 上午10:36:36
 **/
public class adapter extends BaseExpandableListAdapter {

    List<String> GroupList = new ArrayList<String>();
    List<List<String>> ChildrenList = new ArrayList<List<String>>();
    Context context = null;

    public adapter(Context c, List<String> gl, List<List<String>> cl) {
        context = c;
        GroupList.addAll(gl);
        ChildrenList.addAll(cl);
    }

    // 返回组的总数
    @Override
    public int getGroupCount() {
        return GroupList.size();
    }

    // 返回子项总数
    @Override
    public int getChildrenCount(int groupPosition) {
        return ChildrenList.get(groupPosition).size();
    }

    // 返回组对象
    @Override
    public Object getGroup(int groupPosition) {
        return GroupList.get(groupPosition);
    }

    // 返回子项对象
    @Override
    public Object getChild(int groupPosition, int childPosition) {
        return ChildrenList.get(groupPosition).get(childPosition);
    }

    // 返回组ID
    @Override
    public long getGroupId(int groupPosition) {
        return groupPosition;
    }

    // 返回子项ID
    @Override
    public long getChildId(int groupPosition, int childPosition) {
        return childPosition;
    }

    // 是否具有固定ID
    @Override
    public boolean hasStableIds() {
        return false;
    }

    // 返回组VIEW
    @Override
    public View getGroupView(int groupPosition, boolean isExpanded,
            View convertView, ViewGroup parent) {
        TextView tv = new TextView(context);
        tv.setText(GroupList.get(groupPosition));
        tv.setHeight(40);
        return tv;
    }

    // 返回子项VIEW
    @Override
    public View getChildView(int groupPosition, int childPosition,
            boolean isLastChild, View convertView, ViewGroup parent) {
        TextView tv = new TextView(context);
        tv.setText(ChildrenList.get(groupPosition).get(groupPosition));
        tv.setHeight(40);

        return tv;
    }

    // 子项是否可以被选中
    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition) {
        return true;
    }
}

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
	xmlns:android="http://schemas.android.com/apk/res/android"
	android:orientation="vertical"
	android:layout_width="fill_parent"
	android:layout_height="fill_parent">
	<ExpandableListView
		android:id="@id/android:list"
		android:layout_width="fill_parent"
		android:layout_height="wrap_content">
	</ExpandableListView>
</LinearLayout>