本文主要是介绍android ExpandableListView的功能解析,希望对大家解决编程问题提供一定的参考价值,需要的开发者们随着小编来一起学习吧!
在android中,以往用的比较多的是listview,虽然可以实现列表的展示,但在某些情况下,我们还是希望用到可以分组并实现收缩的列表,那就要用到android的ExpandableListView,今天研究了一下这个的用法,也参考了很多资料动手写了一个小demo,实现了基本的功能,但界面优化方面做得还不够好,有待改进,素材采用了Q版三国杀武将的图片,很有爱哈哈,下面直接上效果图以及源代码~!
main.xml的布局很简单啦,只是一个ExpandableListView 就OK了
但值得简单说下的是 android:cacheColorHint="#00000000",这个设置可以去除拖动view时背景变成黑色的效果
android:listSelector="#00000000" ,可以去除选中时的黄色底色
- <span style="font-size:14px;"><?xml version="1.0" encoding="utf-8"?>
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- android:orientation="vertical" >
- <ExpandableListView
- android:id="@+id/list"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- android:background="#ffffff"
- android:cacheColorHint="#00000000"
- android:listSelector="#00000000"
- >
- </ExpandableListView>
- </LinearLayout></span>
java代码:
- <span style="font-size:14px;">package com.eyu.activity_test;
- import android.app.Activity;
- import android.graphics.Color;
- import android.os.Bundle;
- import android.view.Gravity;
- import android.view.View;
- import android.view.ViewGroup;
- import android.view.Window;
- import android.widget.AbsListView;
- import android.widget.BaseExpandableListAdapter;
- import android.widget.ExpandableListAdapter;
- import android.widget.ExpandableListView;
- import android.widget.ExpandableListView.OnChildClickListener;
- import android.widget.ImageView;
- import android.widget.LinearLayout;
- import android.widget.TextView;
- import android.widget.Toast;
- public class ExpandableList extends Activity{
- protected void onCreate(Bundle savedInstanceState) {
- // TODO Auto-generated method stub
- super.onCreate(savedInstanceState);
- requestWindowFeature(Window.FEATURE_NO_TITLE);
- setContentView(R.layout.main);
- final ExpandableListAdapter adapter = new BaseExpandableListAdapter() {
- //设置组视图的图片
- int[] logos = new int[] { R.drawable.wei, R.drawable.shu,R.drawable.wu};
- //设置组视图的显示文字
- private String[] generalsTypes = new String[] { "魏", "蜀", "吴" };
- //子视图显示文字
- private String[][] generals = new String[][] {
- { "夏侯惇", "甄姬", "许褚", "郭嘉", "司马懿", "杨修" },
- { "马超", "张飞", "刘备", "诸葛亮", "黄月英", "赵云" },
- { "吕蒙", "陆逊", "孙权", "周瑜", "孙尚香" }
- };
- //子视图图片
- public int[][] generallogos = new int[][] {
- { R.drawable.xiahoudun, R.drawable.zhenji,
- R.drawable.xuchu, R.drawable.guojia,
- R.drawable.simayi, R.drawable.yangxiu },
- { R.drawable.machao, R.drawable.zhangfei,
- R.drawable.liubei, R.drawable.zhugeliang,
- R.drawable.huangyueying, R.drawable.zhaoyun },
- { R.drawable.lvmeng, R.drawable.luxun, R.drawable.sunquan,
- R.drawable.zhouyu, R.drawable.sunshangxiang } };
- //自己定义一个获得文字信息的方法
- TextView getTextView() {
- AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
- ViewGroup.LayoutParams.FILL_PARENT, 64);
- TextView textView = new TextView(
- ExpandableList.this);
- textView.setLayoutParams(lp);
- textView.setGravity(Gravity.CENTER_VERTICAL);
- textView.setPadding(36, 0, 0, 0);
- textView.setTextSize(20);
- textView.setTextColor(Color.BLACK);
- return textView;
- }
- //重写ExpandableListAdapter中的各个方法
- @Override
- public int getGroupCount() {
- // TODO Auto-generated method stub
- return generalsTypes.length;
- }
- @Override
- public Object getGroup(int groupPosition) {
- // TODO Auto-generated method stub
- return generalsTypes[groupPosition];
- }
- @Override
- public long getGroupId(int groupPosition) {
- // TODO Auto-generated method stub
- return groupPosition;
- }
- @Override
- public int getChildrenCount(int groupPosition) {
- // TODO Auto-generated method stub
- return generals[groupPosition].length;
- }
- @Override
- public Object getChild(int groupPosition, int childPosition) {
- // TODO Auto-generated method stub
- return generals[groupPosition][childPosition];
- }
- @Override
- public long getChildId(int groupPosition, int childPosition) {
- // TODO Auto-generated method stub
- return childPosition;
- }
- @Override
- public boolean hasStableIds() {
- // TODO Auto-generated method stub
- return true;
- }
- @Override
- public View getGroupView(int groupPosition, boolean isExpanded,
- View convertView, ViewGroup parent) {
- // TODO Auto-generated method stub
- LinearLayout ll = new LinearLayout(
- ExpandableList.this);
- ll.setOrientation(0);
- ImageView logo = new ImageView(ExpandableList.this);
- logo.setImageResource(logos[groupPosition]);
- logo.setPadding(50, 0, 0, 0);
- ll.addView(logo);
- TextView textView = getTextView();
- textView.setTextColor(Color.BLACK);
- textView.setText(getGroup(groupPosition).toString());
- ll.addView(textView);
- return ll;
- }
- @Override
- public View getChildView(int groupPosition, int childPosition,
- boolean isLastChild, View convertView, ViewGroup parent) {
- // TODO Auto-generated method stub
- LinearLayout ll = new LinearLayout(
- ExpandableList.this);
- ll.setOrientation(0);
- ImageView generallogo = new ImageView(
- ExpandableList.this);
- generallogo
- .setImageResource(generallogos[groupPosition][childPosition]);
- ll.addView(generallogo);
- TextView textView = getTextView();
- textView.setText(getChild(groupPosition, childPosition)
- .toString());
- ll.addView(textView);
- return ll;
- }
- @Override
- public boolean isChildSelectable(int groupPosition,
- int childPosition) {
- // TODO Auto-generated method stub
- return true;
- }
- };
- ExpandableListView expandableListView = (ExpandableListView) findViewById(R.id.list);
- expandableListView.setAdapter(adapter);
- //设置item点击的监听器
- expandableListView.setOnChildClickListener(new OnChildClickListener() {
- @Override
- public boolean onChildClick(ExpandableListView parent, View v,
- int groupPosition, int childPosition, long id) {
- Toast.makeText(
- ExpandableList.this,
- "你点击了" + adapter.getChild(groupPosition, childPosition),
- Toast.LENGTH_SHORT).show();
- return false;
- }
- });
- }
- }</span>
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