Android ExpandableListView使用方法案例详解

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;
 
    }
}

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