Android ExpandableListView使用（3）： ExpandableListView实现三级列表

ExpandableListView 使用解析（三级列表的实现）

在往常的设计中，往往有类似于QQ的二级列表的样式，而使用ExpandableListView变可以实现这种类似的效果。

当然，如果ExpandableListView嵌套ExpandableListView便可以实现三级列表，甚至多级条目，而本博客最终的实现效果便是三级条目。

效果图：

实体类：

package com.xiaoyehai.expandablelistviewdemo.bean;

import java.util.List;

/**
 * Created by xiaoyehai on 2018/3/15 0015.
 */

public class GroupData {

    private String title;

    private List childDataList;

    public GroupData() {
    }

    public GroupData(String title, List childDataList) {
        this.title = title;
        this.childDataList = childDataList;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public List getChildDataList() {
        return childDataList;
    }

    public void setChildDataList(List childDataList) {
        this.childDataList = childDataList;
    }
}

package com.xiaoyehai.expandablelistviewdemo.bean;

import java.util.List;

/**
 * Created by xiaoyehai on 2018/3/15 0015.
 */

public class ChildData {

    private String title;

    private List thirdDataList;

    public ChildData() {
    }

    public ChildData(String title) {
        this.title = title;
    }

    public ChildData(String title, List thirdDataList) {
        this.title = title;
        this.thirdDataList = thirdDataList;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public List getThirdDataList() {
        return thirdDataList;
    }

    public void setThirdDataList(List thirdDataList) {
        this.thirdDataList = thirdDataList;
    }
}

package com.xiaoyehai.expandablelistviewdemo.bean;

/**
 * Created by xiaoyehai on 2018/3/21 0021.
 */

public class ThirdData {

    private String title;

    public ThirdData() {
    }

    public ThirdData(String title) {
        this.title = title;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }
}

封装数据：

 private void initData() {
        mGroupDataList = new ArrayList<>();

        GroupData groupData;
        ChildData childData;
        ThirdData thirdData;
        List childList;
        List thirdList;

        for (int i = 0; i < 3; i++) {

            groupData = new GroupData();
            groupData.setTitle("分组" + i);

            childList = new ArrayList<>();
            for (int j = 0; j < 3; j++) {
                childData = new ChildData();
                childData.setTitle("二级子列表" + j);

                thirdList = new ArrayList<>();
                for (int z = 0; z < 3; z++) {
                    thirdData = new ThirdData("三级列表" + z);
                    thirdList.add(thirdData);
                }

                childData.setThirdDataList(thirdList);
                childList.add(childData);
            }

            groupData.setChildDataList(childList);
            mGroupDataList.add(groupData);
        }
    }

Activity:

package com.xiaoyehai.expandablelistviewdemo.activity;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.ExpandableListView;

import com.xiaoyehai.expandablelistviewdemo.R;
import com.xiaoyehai.expandablelistviewdemo.adapter.GroupAdapter;
import com.xiaoyehai.expandablelistviewdemo.bean.ChildData;
import com.xiaoyehai.expandablelistviewdemo.bean.GroupData;
import com.xiaoyehai.expandablelistviewdemo.bean.ThirdData;

import java.util.ArrayList;
import java.util.List;

/**
 * ExpandableListView嵌套ExpandableListView
 */
public class Main4Activity extends AppCompatActivity {

    private ExpandableListView mExpandableListView;

    private ArrayList mGroupDataList;

    private GroupAdapter mGroupAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main4);

        mExpandableListView = (ExpandableListView) findViewById(R.id.expand_listview);

        initData();

        mGroupAdapter = new GroupAdapter(this, mGroupDataList);

        mExpandableListView.setAdapter(mGroupAdapter);
    }


    private void initData() {
        mGroupDataList = new ArrayList<>();

        GroupData groupData;
        ChildData childData;
        ThirdData thirdData;
        List childList;
        List thirdList;

        for (int i = 0; i < 3; i++) {

            groupData = new GroupData();
            groupData.setTitle("分组" + i);

            childList = new ArrayList<>();
            for (int j = 0; j < 3; j++) {
                childData = new ChildData();
                childData.setTitle("二级子列表" + j);

                thirdList = new ArrayList<>();
                for (int z = 0; z < 3; z++) {
                    thirdData = new ThirdData("三级列表" + z);
                    thirdList.add(thirdData);
                }

                childData.setThirdDataList(thirdList);
                childList.add(childData);
            }

            groupData.setChildDataList(childList);
            mGroupDataList.add(groupData);
        }
    }
}

适配器：

package com.xiaoyehai.expandablelistviewdemo.adapter;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.ImageView;
import android.widget.TextView;

import com.xiaoyehai.expandablelistviewdemo.R;
import com.xiaoyehai.expandablelistviewdemo.activity.Main4Activity;
import com.xiaoyehai.expandablelistviewdemo.bean.GroupData;
import com.xiaoyehai.expandablelistviewdemo.widget.CustomExpandableListView;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by xiaoyehai on 2018/3/21 0021.
 */

public class GroupAdapter extends BaseExpandableListAdapter {

    private Context mContext;

    private List groupDataList;

    public GroupAdapter(Context context, List groupDataList) {
        mContext = context;
        this.groupDataList = groupDataList;
    }

    @Override
    public int getGroupCount() {
        return groupDataList.size();
    }

    @Override
    public int getChildrenCount(int groupPosition) {
        return groupDataList.get(groupPosition).getChildDataList().size();
    }

    @Override
    public Object getGroup(int groupPosition) {
        return groupDataList.get(groupPosition);
    }

    @Override
    public Object getChild(int groupPosition, int childPosition) {
        return groupDataList.get(groupPosition).getChildDataList().size();
    }

    @Override
    public long getGroupId(int groupPosition) {
        return groupPosition;
    }

    @Override
    public long getChildId(int groupPosition, int childPosition) {
        return childPosition;
    }

    @Override
    public boolean hasStableIds() {
        return true;
    }

    @Override
    public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
        GroupHolder holder = null;
        if (convertView == null) {
            convertView = LayoutInflater.from(mContext).inflate(R.layout.parent_group_item, null);
            holder = new GroupHolder(convertView);
            convertView.setTag(holder);
        } else {
            holder = (GroupHolder) convertView.getTag();
        }

        holder.tvParent.setText(groupDataList.get(groupPosition).getTitle());

        //设置指示器
        if (isExpanded) {
            holder.ivArrow.setImageResource(R.drawable.tree_expand);
        } else {
            holder.ivArrow.setImageResource(R.drawable.tree_econpand);
        }
        return convertView;
    }

    @Override
    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
        ExpandableListView eListView = getExpandableListView();


        ChildAdapter childAdapter = new ChildAdapter(mContext, groupDataList.get(groupPosition).getChildDataList());

        eListView.setAdapter(childAdapter);

        return eListView;
    }

    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition) {
        return true;
    }

    /**
     * 动态创建子ExpandableListView
     */
    public ExpandableListView getExpandableListView() {
        CustomExpandableListView mExpandableListView = new CustomExpandableListView(mContext);
        //mExpandableListView.setDividerHeight(0);// 取消group项的分割线
        //mExpandableListView.setChildDivider(null);// 取消child项的分割线
        mExpandableListView.setGroupIndicator(null);// 取消展开折叠的指示图标
        return mExpandableListView;
    }

    static class GroupHolder {
        private TextView tvParent;
        private ImageView ivArrow;

        public GroupHolder(View v) {
            tvParent = (TextView) v.findViewById(R.id.tv_parent);
            ivArrow = (ImageView) v.findViewById(R.id.iv_arrow);
        }
    }
}

package com.xiaoyehai.expandablelistviewdemo.adapter;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.CheckBox;
import android.widget.ImageView;
import android.widget.SeekBar;
import android.widget.TextView;

import com.xiaoyehai.expandablelistviewdemo.R;
import com.xiaoyehai.expandablelistviewdemo.bean.ChildData;
import com.xiaoyehai.expandablelistviewdemo.bean.GroupData;

import java.util.List;

/**
 * Created by xiaoyehai on 2018/3/21 0021.
 */

public class ChildAdapter extends BaseExpandableListAdapter {

    private Context mContext;

    private List dataList;

    public ChildAdapter(Context context, List dataList) {
        mContext = context;
        this.dataList = dataList;
    }

    @Override
    public int getGroupCount() {
        return dataList.size();
    }

    @Override
    public int getChildrenCount(int groupPosition) {
        return dataList.get(groupPosition).getThirdDataList().size();
    }

    @Override
    public Object getGroup(int groupPosition) {
        return dataList.get(groupPosition).getTitle();
    }

    @Override
    public Object getChild(int groupPosition, int childPosition) {
        return dataList.get(groupPosition).getThirdDataList().get(childPosition).getTitle();
    }

    @Override
    public long getGroupId(int groupPosition) {
        return groupPosition;
    }

    @Override
    public long getChildId(int groupPosition, int childPosition) {
        return childPosition;
    }

    @Override
    public boolean hasStableIds() {
        return true;
    }

    @Override
    public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
        GroupHolder holder = null;
        if (convertView == null) {
            convertView = LayoutInflater.from(mContext).inflate(R.layout.child_group_item, null);
            holder = new GroupHolder(convertView);
            convertView.setTag(holder);
        } else {
            holder = (GroupHolder) convertView.getTag();
        }

        holder.tvTitle.setText(dataList.get(groupPosition).getTitle());

        //设置指示器
        if (isExpanded) {
            holder.ivArrow.setImageResource(R.drawable.tree_expand);
        } else {
            holder.ivArrow.setImageResource(R.drawable.tree_econpand);
        }
        return convertView;
    }

    @Override
    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
        ChildHolder holder = null;
        if (convertView == null) {
            convertView = LayoutInflater.from(mContext).inflate(R.layout.child_child_item, null);
            holder = new ChildHolder(convertView);
            convertView.setTag(holder);
        } else {
            holder = (ChildHolder) convertView.getTag();
        }

        holder.tvTitle.setText(dataList.get(groupPosition).getThirdDataList().get(childPosition).getTitle());


        return convertView;
    }

    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition) {
        return true;
    }


    static class GroupHolder {
        private TextView tvTitle;
        private ImageView ivArrow;

        public GroupHolder(View v) {
            tvTitle = (TextView) v.findViewById(R.id.tv_title);
            ivArrow = (ImageView) v.findViewById(R.id.iv_arrow);
        }
    }

    static class ChildHolder {
        private TextView tvTitle;


        public ChildHolder(View v) {
            tvTitle = (TextView) v.findViewById(R.id.tv_title);
        }

    }
}

自定义ExpandableListView 解决嵌套之下显示不全的问题：

package com.xiaoyehai.expandablelistviewdemo.widget;

import android.content.Context;
import android.util.AttributeSet;
import android.widget.ExpandableListView;

/**
 * 自定义ExpandableListView  解决嵌套之下显示不全的问题
 * Created by xiaoyehai on 2018/3/1 0001.
 */
public class CustomExpandableListView extends ExpandableListView {

    public CustomExpandableListView(Context context) {
        super(context);
    }

    public CustomExpandableListView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    public CustomExpandableListView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        // 解决显示不全的问题
        int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2, MeasureSpec.AT_MOST);
        super.onMeasure(widthMeasureSpec, expandSpec);
    }
}