BaseExpandListAdapter使用详解

BaseExpandableListAdapter的用法

 


<?xml version="1.0" encoding="utf-8"?>


<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"


    android:layout_width="match_parent"


    android:layout_height="match_parent"


    android:orientation="vertical" >




    <ExpandableListView 


        android:layout_width="fill_parent"


        android:layout_height="wrap_content"


        android:id="@+id/ecpandable"


        />




</LinearLayout>
 


package cn.csdn.activity;




import android.app.Activity;


import android.os.Bundle;


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 ExpandableListViewActivity extends Activity{




    @Override


    protected void onCreate(Bundle savedInstanceState) {


        // TODO Auto-generated method stub


        super.onCreate(savedInstanceState);


        setContentView(R.layout.expandable_layout);


        


        /**BaseExpandableListAdapter实现了ExpandableListAdapter*/


        ExpandableListAdapter adapter = new BaseExpandableListAdapter(){




/**----------定义数组-------------------------------------------------------------------*/


            private int[] images = new int[]{


                    R.drawable.ic_launcher,


                    R.drawable.stop,


                    R.drawable.play


            };


            private String[] armTypes = new String[]{


                    "神族","虫族","人族"


            };


            private String[][] arms = new String[][]{


                    {"狂战士","龙骑士","黑暗圣堂"},


                    {"小狗","飞龙","自爆妃子"},


                    {"步兵","伞兵","护士mm"}


            };


                        


/*===========组元素表示可折叠的列表项，子元素表示列表项展开后看到的多个子元素项=============*/




/**----------得到armTypes和arms中每一个元素的ID-------------------------------------------*/


            


            //获取组在给定的位置编号，即armTypes中元素的ID


            @Override


            public long getGroupId(int groupPosition) {


                return groupPosition;


            }


        


            //获取在给定的组的儿童的ID，就是arms中元素的ID


            @Override


            public long getChildId(int groupPosition, int childPosition) {


                return childPosition;


            }


            


/**----------根据上面得到的ID的值，来得到armTypes和arms中元素的个数 ------------------------*/


            


            //获取的群体数量，得到armTypes里元素的个数


            @Override


            public int getGroupCount() {


                return armTypes.length;


            }


            


            //取得指定组中的儿童人数，就是armTypes中每一个种族它军种的个数


            @Override


            public int getChildrenCount(int groupPosition) {


                return arms[groupPosition].length;


            }


            


/**----------利用上面getGroupId得到ID，从而根据ID得到armTypes中的数据，并填到TextView中 -----*/


            


            //获取与给定的组相关的数据，得到数组armTypes中元素的数据


            @Override


            public Object getGroup(int groupPosition) {


                return armTypes[groupPosition];


            }




            //获取一个视图显示给定组，存放armTypes


            @Override


            public View getGroupView(int groupPosition, boolean isExpanded,


                    View convertView, ViewGroup parent) {


                TextView textView = getTextView();//调用定义的getTextView()方法


                textView.setText(getGroup(groupPosition).toString());//添加数据


                return textView;


            }




/**----------利用上面getChildId得到ID，从而根据ID得到arms中的数据，并填到TextView中---------*/


            


            //获取与孩子在给定的组相关的数据,得到数组arms中元素的数据


            @Override


            public Object getChild(int groupPosition, int childPosition) {


                return arms[groupPosition][childPosition];


            }


            


            //获取一个视图显示在给定的组 的儿童的数据，就是存放arms


            @Override


            public View getChildView(int groupPosition, int childPosition, boolean isLastChild,


                    View convertView, ViewGroup parent) {


                LinearLayout ll = new LinearLayout(ExpandableListViewActivity.this);


                ll.setOrientation(0);//定义为纵向排列


                ImageView logo = new ImageView(ExpandableListViewActivity.this);


                logo.setImageResource(images[groupPosition]);//添加图片


                ll.addView(logo);


                TextView textView = getTextView();//调用定义的getTextView()方法


                textView.setText(getChild(groupPosition,childPosition).toString());//添加数据


                ll.addView(textView);


                return ll;


            }


            


/**------------------自定义一个设定TextView属性的方法----------------------------------------------*/


            


            //定义一个TextView


            private TextView getTextView(){


                AbsListView.LayoutParams lp = new AbsListView.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,40);


                TextView textView = new TextView(ExpandableListViewActivity.this);


                textView.setLayoutParams(lp);


                textView.setPadding(36, 0, 0, 0);


                textView.setTextSize(20);


                return textView;


            }


            


/**-------------------其他设置-------------------------------------------------------------------*/


            


            //孩子在指定的位置是可选的，即：arms中的元素是可点击的


            @Override


            public boolean isChildSelectable(int groupPosition,


                    int childPosition) {


                return true;


            }




            //表示孩子是否和组ID是跨基础数据的更改稳定


            public boolean hasStableIds() {


                return true;


            }


        };


            


            /**使用适配器*/


            ExpandableListView expandListView = (ExpandableListView) this.findViewById(R.id.ecpandable);


            expandListView.setAdapter(adapter);


    }




    


}

本文转载至http://www.blogjava.net/jjshcc/archive/2012/02/29/371030.html