【Android】ExpandableListView二级列表使用介绍

ExpandableListView是一个用于垂直滚动展示二级列表的视图，与ListView不同的是它可以展示二级列表，分组可以单独展开子选项。这些选项数据是通过ExpandableListView关联的。

创建布局文件

上述是简单的布局文件使用，同时也可以添加如下属性：

android:childDivider:制定各组内子类表项之间的分隔条，分隔表是一条直线

android:childDivider:制定各组内子类表项之间的分隔条，分隔表是一条直线android:childIndicator:显示在子列表左边的Drawable对象，可以是一个图像android:childIndicatorEnd:子列表指示符的结束约束位置android:childIndicatorLeft:子列表指示符的左边约束位置android:childIndicatorRight:子列表指示符的右边约束位置android:childIndicatorStart:子列表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:组列表指示符的结束约束位置android:indicatorLeft:组列表指示符的左边约束位置android:indicatorRight:组列表指示符的右边约束位置android:indicatorStart:组列表指示符的开始约束位置

父项布局文件：

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

子项布局文件：

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

ExpandableAdapter数据适配器

实现ExpandableAdapter的三种方式

1、拓展BaseExpandableListAdapter实现ExpandableAdapter

2、使用simpleExpandableListAdapter将两个list集合包装成ExpandableAdapter

本demo使用第一种方式实现数据适配器，由于父项和子项都有一些点击事件，因此使用了接口回调的方式实现。

public class ListGroupExpandableAdapter extends BaseExpandableListAdapter {    private static final String TAG = ListGroupExpandableAdapter.class.getSimpleName();    private java.util.List listGroups;    private java.util.List> lists;    private OnChildClickListener mOnChildClickListener;    private OnParentClickListener mOnParentClickListener;    public ListGroupExpandableAdapter(java.util.List listGroups, java.util.List> lists) {        this.listGroups = listGroups;        this.lists = lists;    }    public void setOnChildClickListener(OnChildClickListener onChildClickListener){        mOnChildClickListener = onChildClickListener;    }    public void setOnParentClickListener(OnParentClickListener onParentClickListener){        mOnParentClickListener = onParentClickListener;    }    @Override    public int getGroupCount() {  //获取父项数量        return listGroups.size();    }    @Override    public int getChildrenCount(int i) {  //获取子项数量        return lists.get(i).size();    }    @Override    public Object getGroup(int i) {  //获取父项        return listGroups.get(i);    }    @Override    public Object getChild(int i, int i1) {//获取子项        return lists.get(i).get(i1);    }    @Override    public long getGroupId(int i) {  //获取父项位置        return i;    }    @Override    public long getChildId(int i, int i1) {  //获取子项位置        return i1;    }    @Override    public boolean hasStableIds() {          return true;    }    @Override    public View getGroupView(final int i, boolean b, View view, ViewGroup viewGroup) {  //获取父项布局        GroupViewHolder groupViewHolder;        if(view == null) {            view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_group_group_item, null);            groupViewHolder = new GroupViewHolder();            groupViewHolder.view = view;            groupViewHolder.listGroupNameTv = view.findViewById(R.id.tv_item_list_group_name);            view.setTag(groupViewHolder);        }else {            groupViewHolder = (GroupViewHolder) view.getTag();        }        Log.d(TAG, "getGroupView: " + listGroups.get(i).getName());        groupViewHolder.listGroupNameTv.setText(listGroups.get(i).getName());        if(mOnParentClickListener != null) {            groupViewHolder.view.setOnClickListener(new View.OnClickListener() {                @Override                public void onClick(View view) {                    mOnParentClickListener.onParentClickListener(view, i);                }            });            groupViewHolder.view.setOnLongClickListener(new View.OnLongClickListener() {                @Override                public boolean onLongClick(View view) {                    mOnParentClickListener.onParentLongClickListener(view, i);                    return true;                }            });        }        return view;    }    @Override    public View getChildView(final int i, final int i1, boolean b, View convertView, ViewGroup viewGroup) {  //获取子项布局        ChildViewHolder childViewHolder;        View view;        if(convertView == null) {            view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_item, null);            childViewHolder = new ChildViewHolder();            childViewHolder.view = view;            childViewHolder.priorityColor = view.findViewById(R.id.v_list_item_priority);            childViewHolder.listNameTv = view.findViewById(R.id.tv_list_item_list_name);            childViewHolder.stuffNumTv = view.findViewById(R.id.tv_list_item_stuffs);            view.setTag(childViewHolder);        }else {            view = convertView;            childViewHolder = (ChildViewHolder) view.getTag();        }        switch (lists.get(i).get(i1).getPriority()) {            case 1:                childViewHolder.priorityColor.setBackgroundColor(childViewHolder.priorityColor.getResources().getColor(R.color.colorBule));                break;            case 2:                childViewHolder.priorityColor.setBackgroundColor(childViewHolder.priorityColor.getResources().getColor(R.color.colorYellow));                break;            case 3:                childViewHolder.priorityColor.setBackgroundColor(childViewHolder.priorityColor.getResources().getColor(R.color.colorAccent));                break;            default:                childViewHolder.priorityColor.setBackgroundColor(childViewHolder.priorityColor.getResources().getColor(R.color.colorWhite));                break;        }        childViewHolder.listNameTv.setText(lists.get(i).get(i1).getName());        childViewHolder.stuffNumTv.setText(String.valueOf(lists.get(i).get(i1).getStuffs()));        if(mOnChildClickListener != null) {            childViewHolder.view.setOnClickListener(new View.OnClickListener() {                @Override                public void onClick(View view) {                    mOnChildClickListener.onChildClickListener(view, i, i1);                }            });            childViewHolder.view.setOnLongClickListener(new View.OnLongClickListener() {                @Override                public boolean onLongClick(View view) {                    mOnChildClickListener.onChildLongClickListener(view, i, i1);                    return true;                }            });        }        return view;    }    @Override    public boolean isChildSelectable(int i, int i1) {        return true;    }    public interface OnChildClickListener {   //子项点击事件        void onChildClickListener(View view, int parentPos, int childPos);        void onChildLongClickListener(View view, int parentPos, int childPos);    }    public interface OnParentClickListener{   //父项点击事件        void onParentClickListener(View view, int parentPos);        void onParentLongClickListener(View view, int parentPos);    }    class GroupViewHolder {        View view;        TextView listGroupNameTv;    }    class ChildViewHolder {        View view;        View priorityColor;        TextView listNameTv;        TextView stuffNumTv;    }}

使用ExpandableListView

传入父项数据和子项数据，创建数据适配器，然后在expandableListView中设置数据适配器。

public void showAllLists(final java.util.List listGroups, final java.util.List> lists) {        try{            mListGroups = listGroups;            mLists = lists;            mExpandableAdapter = new ListGroupExpandableAdapter(mListGroups, mLists);            mExpandableAdapter.setOnChildClickListener(new ListGroupExpandableAdapter.OnChildClickListener() {                @Override                public void onChildClickListener(View view, int parentPos, int childPos) {                    try{                        showListDetail(lists.get(parentPos).get(childPos));                    }catch (Exception e){                        e.printStackTrace();                    }                }                @Override                public void onChildLongClickListener(View view, final int parentPos, final int childPos) {                    try{                        getActivity().runOnUiThread(new Runnable() {                            @Override                            public void run() {                                onChildLongClick(parentPos, childPos);                            }                        });                    }catch (Exception e){                        e.printStackTrace();                    }                }            });            mExpandableAdapter.setOnParentClickListener(new ListGroupExpandableAdapter.OnParentClickListener() {                @Override                public void onParentClickListener(View view, final int parentPos) {                    try{                        getActivity().runOnUiThread(new Runnable() {                            @Override                            public void run() {                                if(mExpandableListView.isGroupExpanded(parentPos)) {                                    mExpandableListView.collapseGroup(parentPos);                                }else {                                    mExpandableListView.expandGroup(parentPos);                                }                            }                        });                    }catch (Exception e){                        e.printStackTrace();                    }                }                @Override                public void onParentLongClickListener(View view, final int parentPos) {                    try{                        getActivity().runOnUiThread(new Runnable() {                            @Override                            public void run() {                                onParentLongClick(parentPos);                            }                        });                    }catch (Exception e){                        e.printStackTrace();                    }                }            });            getActivity().runOnUiThread(new Runnable() {                @Override                public void run() {                    mExpandableListView.setAdapter(mExpandableAdapter);                    mExpandableListView.setOnScrollListener(new AbsListView.OnScrollListener() {                        @Override                        public void onScrollStateChanged(AbsListView absListView, int i) {                        }                        @Override                        public void onScroll(AbsListView absListView, int firstVisibleItem, int visibleItemCount, int totalItemCount) {                            View firstView = absListView.getChildAt(firstVisibleItem);                            if (firstVisibleItem == 0 && (firstView == null || firstView.getTop() == 0)) {                                mSwipeRefreshLayout.setEnabled(true);                            } else {                                mSwipeRefreshLayout.setEnabled(false);                            }                        }                    });                    int count = mExpandableListView.getCount();                    for (int i = 0; i < count; i++) {   //默认展开所有父项                        mExpandableListView.expandGroup(i);                    }                    mExpandableListView.setVisibility(View.VISIBLE);                }            });        }catch (Exception e){            e.printStackTrace();        }    }

最后实现的效果如下：

groupIndicator父项列表指示，也可以设置为不显示或者自定义指示器:

 mExpandableListView.setGroupIndicator(null); mExpandableListView.setGroupIndicator(getActivity().getResources().getDrawable(R.drawable.group_indicator));

指示器布局：

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

创建布局文件

ExpandableAdapter数据适配器

使用ExpandableListView

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