ExpandableListView练习代码

ExpandableListView是可展开的列表组件

activity_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/list"
	android:layout_width="fill_parent" 
	android:layout_height="wrap_content" 
	android:childIndicator="@drawable/ic_launcher"
	/>
</LinearLayout>

MainActivity.java

package com.example.expandablelistview;

import android.os.Bundle;
import android.app.Activity;
import android.app.ExpandableListActivity;
import android.view.Gravity;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		//Create a "BaseExpandableListAdapter" object
		ExpandableListAdapter adapter = new BaseExpandableListAdapter() {
			
			int[] logos = new int[]{
					R.drawable.p,
					R.drawable.t,
					R.drawable.z
			};
			private String[] armTypes = new String[]{
					"神族兵种","虫族兵种","人族兵种"
			};
			private String[][] arms = new String[][]{{"狂战士","龙骑士","黑暗圣堂","电兵"},{"小狗","刺蛇","飞龙","自爆飞机"},
					{"机枪兵","护士MM","幽灵"}};
			
			
			@Override
			public boolean isChildSelectable(int groupPosition, int childPosition) {
				// TODO Auto-generated method stub
				return true;
			}
			
			@Override
			public boolean hasStableIds() {
				// TODO Auto-generated method stub
				return true;
			}
			
			//该方法决定每个组选项的外观
			@Override
			public View getGroupView(int groupPosition, boolean isExpanded,
					View convertView, ViewGroup parent) {
				LinearLayout ll = new LinearLayout(MainActivity.this);
				ll.setOrientation(0);
				ImageView logo = new ImageView(MainActivity.this);
				logo.setImageResource(logos[groupPosition]);
				ll.addView(logo);
				TextView textView = getTextView();
				textView.setText(getGroup(groupPosition).toString());
				ll.addView(textView);
				
				return ll;
			}
			
			@Override
			public long getGroupId(int groupPosition) {
				// TODO Auto-generated method stub
				return groupPosition;
			}
			
			@Override
			public int getGroupCount() {
				// TODO Auto-generated method stub
				return armTypes.length;
			}
			
			//获取指定组位置处的组数据
			@Override
			public Object getGroup(int groupPosition) {
				// TODO Auto-generated method stub
				return armTypes[groupPosition];
			}
			
			@Override
			public int getChildrenCount(int groupPosition) {
				// TODO Auto-generated method stub
				return arms[groupPosition].length;
			}
			
			//The method determines the appearance of each sub-option
			@Override
			public View getChildView(int groupPosition, int childPosition,
					boolean isLastChild, View convertView, ViewGroup parent) {
				TextView textView = getTextView();
				textView.setText(getChild(groupPosition,childPosition).toString());
				return textView;
			}
			
			@Override
			public long getChildId(int groupPosition, int childPosition) {
				// TODO Auto-generated method stub
				return childPosition;
			}
			
			//Obtain the specified group location,specify the child at the child list item list item data
			@Override
			public Object getChild(int groupPosition, int childPosition) {
				// TODO Auto-generated method stub
				return arms[groupPosition][childPosition];
			}
			private TextView getTextView(){
				AbsListView.LayoutParams lp = new AbsListView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, 64);
				TextView textView = new TextView(MainActivity.this);
				textView.setLayoutParams(lp);
				textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
				textView.setPadding(36, 0, 0, 0);
				textView.setTextSize(20);
				return textView;
			}
			
			
		};
		ExpandableListView expandableListView = (ExpandableListView)findViewById(R.id.list);
		expandableListView.setAdapter(adapter);
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}