android ExpandableListView详解

ExpandableListView是android中可以实现下拉list的一个控件，是一个垂直滚动的心事两个级别列表项手风琴试图，列表项是来自ExpandableListViewaAdapter，组可以单独展开。

重要方法：

 expandGroup (int groupPos) ;//在分组列表视图中 展开一组，

 setSelectedGroup (int groupPosition) ;//设置选择指定的组。

 setSelectedChild (int groupPosition, int childPosition, boolean shouldExpandGroup);//设置选择指定的子项。

 getPackedPositionGroup (long packedPosition);//返回所选择的组

 getPackedPositionForChild (int groupPosition, int childPosition) ;//返回所选择的子项

 getPackedPositionType (long packedPosition);//返回所选择项的类型（Child,Group）

 isGroupExpanded (int groupPosition);//判断此组是否展开

expandableListView.setDivider();这个是设定每个Group之间的分割线。

expandableListView.setGroupIndicator();这个是设定每个Group之前的那个图标。

expandableListView.collapseGroup(int group); 将第group组收起

ExpandableListAdapter

一个接口，将基础数据链接到一个ExpandableListView。此接口的实施将提供访问Child的数据（由组分类），并实例化的Child和Group。

1.重要方法

　　　　getChildId (int groupPosition, int childPosition) 获取与在给定组给予孩子相关的数据。

　　　　getChildrenCount (int groupPosition) 返回在指定Group的Child数目。

案例：

首先定义个一个布局文件expandablelistview.xml

 <?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/expandableListView"

         android:layout_width ="fill_parent"

         android:layout_height ="wrap_content"

         >

      </ExpandableListView>

 </LinearLayout>

 package com.test;

 import java.util.ArrayList;

 import java.util.List;

 import javax.security.auth.PrivateCredentialPermission;

 import android.app.Activity;

 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.ExpandableListView;

 import android.widget.TextView;

 public class ExpandableListViewDemo extends Activity {

     /** Called when the activity is first created. */

     //定义两个List用来控制Group和Child中的String;

     private  List<String>  groupArray;//组列表

     private  List<List<String>> childArray;//子列表

     private  ExpandableListView  expandableListView_one;

     @Override

     public void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

 //        requestWindowFeature(Window.FEATURE_NO_TITLE);  //设置为无标题

         setContentView(R.layout.expandablelistview);

         expandableListView_one =(ExpandableListView)findViewById(R.id.expandableListView);

         groupArray =new ArrayList<String>();

         childArray = new ArrayList<List<String>>();

         /*-第一季-*/

         initdate();

         expandableListView_one.setAdapter(new ExpandableListViewaAdapter(ExpandableListViewDemo.this));

         /*-第二季-*/

 //        groupArray.add("移动开发");

 //        List<String> arrayList = new ArrayList<String>();

 //        arrayList.add("Android");

 //        arrayList.add("IOS");

 //        arrayList.add("Windows Phone");

 //        //组循环

 //        for(int index=0;index<groupArray.size();++index)

 //        {

 //            childArray.add(arrayList);

 //        }

 //        expandableListView_one.setAdapter(new ExpandableListViewaAdapter(ExpandableListViewDemo.this));

     }

     class ExpandableListViewaAdapter extends BaseExpandableListAdapter {

         Activity activity;

          public  ExpandableListViewaAdapter(Activity a)

             {

                 activity = a;

             }

        /*-----------------Child */

         @Override

         public Object getChild(int groupPosition, int childPosition) {

             // TODO Auto-generated method stub

             return childArray.get(groupPosition).get(childPosition);

         }

         @Override

         public long getChildId(int groupPosition, int childPosition) {

             // TODO Auto-generated method stub

             return childPosition;

         }

         @Override

         public View getChildView(int groupPosition, int childPosition,

                 boolean isLastChild, View convertView, ViewGroup parent) {

             String string =childArray.get(groupPosition).get(childPosition);

             return getGenericView(string);

         }

         @Override

         public int getChildrenCount(int groupPosition) {

             // TODO Auto-generated method stub

             return childArray.get(groupPosition).size();

         }

        /* ----------------------------Group */

         @Override

         public Object getGroup(int groupPosition) {

             // TODO Auto-generated method stub

             return getGroup(groupPosition);

         }

         @Override

         public int getGroupCount() {

             // TODO Auto-generated method stub

             return groupArray.size();

         }

         @Override

         public long getGroupId(int groupPosition) {

             // TODO Auto-generated method stub

             return groupPosition;

         }

         @Override

         public View getGroupView(int groupPosition, boolean isExpanded,

                 View convertView, ViewGroup parent) {

            String   string=groupArray.get(groupPosition);

            return getGenericView(string);

         }

         @Override

         public boolean hasStableIds() {

             // TODO Auto-generated method stub

             return false;

         }

         @Override

         public boolean isChildSelectable(int groupPosition, int childPosition)

         {

             // TODO Auto-generated method stub

             return true;

         }

         private TextView  getGenericView(String string )

         {

               AbsListView.LayoutParams  layoutParams =new AbsListView.LayoutParams(

                     ViewGroup.LayoutParams.MATCH_PARENT,

                     ViewGroup.LayoutParams.WRAP_CONTENT);

               TextView  textView =new TextView(activity);

               textView.setLayoutParams(layoutParams);

               textView.setGravity(Gravity.CENTER_VERTICAL |Gravity.LEFT);

               textView.setPadding(40, 0, 0, 0);

               textView.setText(string);

               return textView;

          }

     }

     private void initdate()

     {

         addInfo("语言", new String[]{"Oracle","Java","Linux","Jquery"});

         addInfo("男人的需求", new String[]{"金钱","事业","权力","女人","房子","车","球"});

     }

     private void addInfo(String group,String []child) {

         groupArray.add(group);

         List<String>  childItem =new ArrayList<String>();

         for(int index=0;index<child.length;index++)

         {

             childItem.add(child[index]);

         }

          childArray.add(childItem);

     }

 }

巴特西

android ExpandableListView详解

最新文章

热门文章