BaseExpandableListAdapter的用法

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);


}






}





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