Android ExpandableListView使用方法案例详解

Haidee ·

更新时间:2024-09-21

· 1094 次阅读

一、前言

二、实现的功能

三、具体代码

1、主xml代码

2、父布局xml代码

3、子布局xml代码

4、主activity代码

5、adapter代码

一、前言

“好记性不如烂笔头”，再次验证了这句话是真的很有道理啊，一个月前看了一下ExpandableListView的使用，今天再看居然忘了这个是干啥的了，今天就详细讲解一下ExpandableListView的使用方法，感觉对于二级条目显示功能都可以实现。

二、实现的功能

1、可实现二级列表条目显示功能，具体包括可自定义，父布局和子布局。可实现父布局全部展开和只展开一个功能。

三、具体代码 1、主xml代码


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:orientation="vertical"
    android:layout_height="match_parent">
    <include layout="@layout/top"/>
    <ExpandableListView
        android:id="@+id/expand_list_id"
        android:layout_width="match_parent"
        android:groupIndicator="@null"
        android:layout_height="match_parent">
    </ExpandableListView>
</LinearLayout>

2、父布局xml代码


<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:background="@color/blue"
    android:layout_height="50dp">
    <TextView
        android:id="@+id/parent_textview_id"
        android:layout_width="wrap_content"
        android:text="测试"
        android:textColor="@color/white"
        android:gravity="center_vertical"
        android:paddingLeft="10dp"
        android:textSize="18sp"
        android:layout_height="match_parent" />
    <ImageView
        android:id="@+id/parent_image"
        android:layout_width="wrap_content"
        android:layout_alignParentRight="true"
        android:src="@drawable/img_arrow_right"
        android:layout_centerInParent="true"
        android:paddingRight="10dp"
        android:layout_height="wrap_content" />
</RelativeLayout>

3、子布局xml代码


<?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">
    <TextView
        android:id="@+id/chidren_item"
        android:layout_width="match_parent"
        android:text="子项目"
        android:gravity="center_vertical"
        android:paddingLeft="10dp"
        android:textColor="@color/black"
        android:layout_height="40dp" />
</LinearLayout>

4、主activity代码


**
 * Created by fyf on 2019/3/1.
 * 描述：用于实现ExpandableListView的类，主要功能是实现二级列表条目显示
 */
public class ExpandableListviewActivity extends BaseActivity {
    private ExpandableListView expand_list_id;
    //Model：定义的数据
    private String[] groups = {"开发部", "人力资源部", "销售部"};
    //注意，字符数组不要写成{{"A1,A2,A3,A4"}, {"B1,B2,B3,B4，B5"}, {"C1,C2,C3,C4"}}
    private String[][] childs = {{"赵珊珊", "钱丹丹", "孙可可", "李冬冬"}, {"周大福", "吴端口", "郑非", "王疯狂"}, {"冯程程", "陈类", "楚哦", "魏王"}};
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.expandable_list_view);
        setTitle("ExpandableListView二级下拉",false,"");
        initView();
    }
    private void initView(){
        expand_list_id=findViewById(R.id.expand_list_id);
        ExpandableListviewAdapter adapter=new ExpandableListviewAdapter(this,groups,childs);
        expand_list_id.setAdapter(adapter);
        //默认展开第一个数组
        expand_list_id.expandGroup(0);
        //关闭数组某个数组，可以通过该属性来实现全部展开和只展开一个列表功能
        //expand_list_id.collapseGroup(0);
        expand_list_id.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
            @Override
            public boolean onGroupClick(ExpandableListView expandableListView, View view, int groupPosition, long l) {
                showToastShort(groups[groupPosition]);
                return false;
            }
        });
        //子视图的点击事件
        expand_list_id.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
            @Override
            public boolean onChildClick(ExpandableListView expandableListView, View view, int groupPosition, int childPosition, long l) {
                showToastShort(childs[groupPosition][childPosition]);
                return true;
            }
        });
        //用于当组项折叠时的通知。
        expand_list_id.setOnGroupCollapseListener(new ExpandableListView.OnGroupCollapseListener() {
            @Override
            public void onGroupCollapse(int groupPosition) {
                showToastShort("折叠了数据___"+groups[groupPosition]);
            }
        });
        //
        //用于当组项折叠时的通知。
        expand_list_id.setOnGroupExpandListener(new ExpandableListView.OnGroupExpandListener() {
            @Override
            public void onGroupExpand(int groupPosition) {
                showToastShort("展开了数据___"+groups[groupPosition]);
            }
        });
    }
}

5、adapter代码


/**
 * Created by fyf on 2019/3/1.
 * 描述：是二级显示列表的adapter
 */
public class ExpandableListviewAdapter extends BaseExpandableListAdapter {
    //Model：定义的数据
    private String[] groups;
    //注意，字符数组不要写成{{"A1,A2,A3,A4"}, {"B1,B2,B3,B4，B5"}, {"C1,C2,C3,C4"}}
    private String[][] childs;
    private Context context;
    public ExpandableListviewAdapter(Context context,String[] groups,String[][] childs){
        this.context=context;
        this.groups=groups;
        this.childs=childs;
    }
    @Override
    public int getGroupCount() {
        return groups.length;
    }
    @Override
    public int getChildrenCount(int i) {
        return childs[i].length;
    }
    @Override
    public Object getGroup(int i) {
        return groups[i];
    }
    @Override
    public Object getChild(int i, int i1) {
        return childs[i][i1];
    }
    @Override
    public long getGroupId(int i) {
        return i;
    }
    @Override
    public long getChildId(int i, int i1) {
        return i1;
    }
    @Override
    //分组和子选项是否持有稳定的ID, 就是说底层数据的改变会不会影响到它们
    public boolean hasStableIds() {
        return true;
    }
    @Override
/**
 *
 * 获取显示指定组的视图对象
 *
 * @param groupPosition 组位置
 * @param isExpanded 该组是展开状态还是伸缩状态，true=展开
 * @param convertView 重用已有的视图对象
 * @param parent 返回的视图对象始终依附于的视图组
 */
    public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
        GroupViewHolder groupViewHolder;
        if (convertView == null){
            convertView = LayoutInflater.from(parent.getContext()).inflate(R.layout.expand_parent_item,parent,false);
            groupViewHolder = new GroupViewHolder();
            groupViewHolder.parent_textview_id = convertView.findViewById(R.id.parent_textview_id);
            groupViewHolder.parent_image = convertView.findViewById(R.id.parent_image);
            convertView.setTag(groupViewHolder);
        }else {
            groupViewHolder = (GroupViewHolder)convertView.getTag();
        }
        groupViewHolder.parent_textview_id.setText(groups[groupPosition]);
        //如果是展开状态，
        if (isExpanded){
            groupViewHolder.parent_image.setImageDrawable(ContextCompat.getDrawable(context,R.drawable.img_arrow_down));
        }else{
            groupViewHolder.parent_image.setImageDrawable(ContextCompat.getDrawable(context,R.drawable.img_arrow_right));
        }
        return convertView;
    }
    @Override
    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
        ChildViewHolder childViewHolder;
        if (convertView==null){
            convertView = LayoutInflater.from(parent.getContext()).inflate(R.layout.expand_chidren_item,parent,false);
            childViewHolder = new ChildViewHolder();
            childViewHolder.chidren_item = (TextView)convertView.findViewById(R.id.chidren_item);
            convertView.setTag(childViewHolder);
        }else {
            childViewHolder = (ChildViewHolder) convertView.getTag();
        }
        childViewHolder.chidren_item.setText(childs[groupPosition][childPosition]);
        return convertView;
    }
    //指定位置上的子元素是否可选中
    @Override
    public boolean isChildSelectable(int i, int i1) {
        return true;
    }
    static class GroupViewHolder {
        TextView parent_textview_id;
        ImageView parent_image;
    }
    static class ChildViewHolder {
        TextView chidren_item;
    }
}

到此这篇关于Android ExpandableListView使用方法案例详解的文章就介绍到这了,更多相关Android ExpandableListView使用方法内容请搜索软件开发网以前的文章或继续浏览下面的相关文章希望大家以后多多支持软件开发网！

方法 expandablelistview Android

1024 个赞