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ExpandableListView(可折叠列表)的基本使用

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前言:

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1.相关属性

android:childDivider:指定各组内子类表项之间的分隔条,图片不会完全显示, 分离子列表项的是一条直线android:childIndicator:显示在子列表旁边的Drawable对象,可以是一个图像android:childIndicatorEnd:子列表项指示符的结束约束位置android:childIndicatorLeft:子列表项指示符的左边约束位置android:childIndicatorRight:子列表项指示符的右边约束位置android:childIndicatorStart:子列表项指示符的开始约束位置android:groupIndicator:显示在组列表旁边的Drawable对象,可以是一个图像android:indicatorEnd:组列表项指示器的结束约束位置android:indicatorLeft:组列表项指示器的左边约束位置android:indicatorRight:组列表项指示器的右边约束位置android:indicatorStart:组列表项指示器的开始约束位置

2.实现ExpandableAdapter的三种方式

1. 扩展BaseExpandableListAdpter实现ExpandableAdapter。

2. 使用SimpleExpandableListAdpater将两个List集合包装成ExpandableAdapter

3. 使用simpleCursorTreeAdapter将Cursor中的数据包装成SimpleCuroTreeAdapter 本节示例使用的是第一个,扩展BaseExpandableListAdpter,我们需要重写该类中的相关方法, 下面我们通过一个代码示例来体验下!

3.代码示例

我们来看下实现的效果图:

下面我们就来实现上图的这个效果:

核心是重写BaseExpandableListAdpter,其实和之前写的普通的BaseAdapter是类似的, 但是BaseExpandableListAdpter则分成了两部分:组和子列表,具体看代码你就知道了!

另外,有一点要注意的是,重写isChildSelectable()方法需要返回true,不然不会触发 子Item的点击事件!下面我们来写写:

首先是组和子列表的布局:

item_exlist_group.xml:

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

<LinearLayout xmlns:android=""

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="horizontal"

android:padding="5dp">

<TextView

android:id="@+id/tv_group_name"

android:layout_width="match_parent"

android:layout_height="56dp"

android:gravity="center_vertical"

android:paddingLeft="30dp"

android:text="AP"

android:textStyle="bold"

android:textSize="20sp" />

</LinearLayout>

item_exlist_item.xml:

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

<LinearLayout xmlns:android=""

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="horizontal"

android:padding="5dp"

android:background="#6BBA79">

<ImageView

android:id="@+id/img_icon"

android:layout_width="48dp"

android:layout_height="48dp"

android:src="@mipmap/iv_lol_icon1"

android:focusable="false"/>

<TextView

android:id="@+id/tv_name"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginLeft="15dp"

android:layout_marginTop="15dp"

android:focusable="false"

android:text="提莫"

android:textSize="18sp" />

</LinearLayout>

然后是自定义的Adapter类:

MyBaseExpandableListAdapter.java:

/**

* Created by Jay on 2015/9/25 0025.

*/

public class MyBaseExpandableListAdapter extends BaseExpandableListAdapter {

private ArrayList<Group> gData;

private ArrayList<ArrayList<Item>> iData;

private Context mContext;

public MyBaseExpandableListAdapter(ArrayList<Group> gData,ArrayList<ArrayList<Item>> iData, Context mContext) {

this.gData = gData;

this.iData = iData;

this.mContext = mContext;

}

@Override

public int getGroupCount() {

return gData.size();

}

@Override

public int getChildrenCount(int groupPosition) {

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

}

@Override

public Group getGroup(int groupPosition) {

return gData.get(groupPosition);

}

@Override

public Item getChild(int groupPosition, int childPosition) {

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

}

@Override

public long getGroupId(int groupPosition) {

return groupPosition;

}

@Override

public long getChildId(int groupPosition, int childPosition) {

return childPosition;

}

@Override

public boolean hasStableIds() {

return false;

}

//取得用于显示给定分组的视图. 这个方法仅返回分组的视图对象

@Override

public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {

ViewHolderGroup groupHolder;

if(convertView == null){

convertView = LayoutInflater.from(mContext).inflate(

R.layout.item_exlist_group, parent, false);

groupHolder = new ViewHolderGroup();

groupHolder.tv_group_name = (TextView) convertView.findViewById(R.id.tv_group_name);

convertView.setTag(groupHolder);

}else{

groupHolder = (ViewHolderGroup) convertView.getTag();

}

groupHolder.tv_group_name.setText(gData.get(groupPosition).getgName());

return convertView;

}

//取得显示给定分组给定子位置的数据用的视图

@Override

public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {

ViewHolderItem itemHolder;

if(convertView == null){

convertView = LayoutInflater.from(mContext).inflate(

R.layout.item_exlist_item, parent, false);

itemHolder = new ViewHolderItem();

itemHolder.img_icon = (ImageView) convertView.findViewById(R.id.img_icon);

itemHolder.tv_name = (TextView) convertView.findViewById(R.id.tv_name);

convertView.setTag(itemHolder);

}else{

itemHolder = (ViewHolderItem) convertView.getTag();

}

itemHolder.img_icon.setImageResource(iData.get(groupPosition).get(childPosition).getiId());

itemHolder.tv_name.setText(iData.get(groupPosition).get(childPosition).getiName());

return convertView;

}

//设置子列表是否可选中

@Override

public boolean isChildSelectable(int groupPosition, int childPosition) {

return true;

}

private static class ViewHolderGroup{

private TextView tv_group_name;

}

private static class ViewHolderItem{

private ImageView img_icon;

private TextView tv_name;

}

}

PS:存储子列表的数据不一定要用ArrayList<ArrayList>这种,根据自己的需求 定义~

最后是MainActivity的布局以及Java代码:

布局文件:activity_main.xml:

<RelativeLayout xmlns:android=""

xmlns:tools=""

android:layout_width="match_parent"

android:layout_height="match_parent"

android:padding="5dp"

tools:context=".MainActivity">

<ExpandableListView

android:id="@+id/exlist_lol"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:childDivider="#E02D2F"/>

</RelativeLayout>

MainActivity.java:

public class MainActivity extends AppCompatActivity {

private ArrayList<Group> gData = null;

private ArrayList<ArrayList<Item>> iData = null;

private ArrayList<Item> lData = null;

private Context mContext;

private ExpandableListView exlist_lol;

private MyBaseExpandableListAdapter myAdapter = null;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

mContext = MainActivity.this;

exlist_lol = (ExpandableListView) findViewById(R.id.exlist_lol);

//数据准备

gData = new ArrayList<Group>();

iData = new ArrayList<ArrayList<Item>>();

gData.add(new Group("AD"));

gData.add(new Group("AP"));

gData.add(new Group("TANK"));

lData = new ArrayList<Item>();

//AD组

lData.add(new Item(R.mipmap.iv_lol_icon3,"剑圣"));

lData.add(new Item(R.mipmap.iv_lol_icon4,"德莱文"));

lData.add(new Item(R.mipmap.iv_lol_icon13,"男枪"));

lData.add(new Item(R.mipmap.iv_lol_icon14,"韦鲁斯"));

iData.add(lData);

//AP组

lData = new ArrayList<Item>();

lData.add(new Item(R.mipmap.iv_lol_icon1, "提莫"));

lData.add(new Item(R.mipmap.iv_lol_icon7, "安妮"));

lData.add(new Item(R.mipmap.iv_lol_icon8, "天使"));

lData.add(new Item(R.mipmap.iv_lol_icon9, "泽拉斯"));

lData.add(new Item(R.mipmap.iv_lol_icon11, "狐狸"));

iData.add(lData);

//TANK组

lData = new ArrayList<Item>();

lData.add(new Item(R.mipmap.iv_lol_icon2, "诺手"));

lData.add(new Item(R.mipmap.iv_lol_icon5, "德邦"));

lData.add(new Item(R.mipmap.iv_lol_icon6, "奥拉夫"));

lData.add(new Item(R.mipmap.iv_lol_icon10, "龙女"));

lData.add(new Item(R.mipmap.iv_lol_icon12, "狗熊"));

iData.add(lData);

myAdapter = new MyBaseExpandableListAdapter(gData,iData,mContext);

exlist_lol.setAdapter(myAdapter);

//为列表设置点击事件

exlist_lol.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {

@Override

public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {

Toast.makeText(mContext, "你点击了:" + iData.get(groupPosition).get(childPosition).getiName(), Toast.LENGTH_SHORT).show();

return true;

}

});

}

}

4.代码下载:

ExpandableListViewDemo.zip

本节小结:

好的,本节给大家介绍了ExpandableListView的基本使用,嘿嘿,有点意思~ 这里只是一个示例,其他的根据自己的需求自行扩展~谢谢

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