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 /3/15 0015.*/public class GroupData {private String title;private List<ChildData> childDataList;public GroupData() {}public GroupData(String title, List<ChildData> childDataList) {this.title = title;this.childDataList = childDataList;}public String getTitle() {return title;}public void setTitle(String title) {this.title = title;}public List<ChildData> getChildDataList() {return childDataList;}public void setChildDataList(List<ChildData> childDataList) {this.childDataList = childDataList;}}
package com.xiaoyehai.expandablelistviewdemo.bean;import java.util.List;/*** Created by xiaoyehai on /3/15 0015.*/public class ChildData {private String title;private List<ThirdData> thirdDataList;public ChildData() {}public ChildData(String title) {this.title = title;}public ChildData(String title, List<ThirdData> thirdDataList) {this.title = title;this.thirdDataList = thirdDataList;}public String getTitle() {return title;}public void setTitle(String title) {this.title = title;}public List<ThirdData> getThirdDataList() {return thirdDataList;}public void setThirdDataList(List<ThirdData> thirdDataList) {this.thirdDataList = thirdDataList;}}
package com.xiaoyehai.expandablelistviewdemo.bean;/*** Created by xiaoyehai on /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<ChildData> childList;List<ThirdData> 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<GroupData> mGroupDataList;private GroupAdapter mGroupAdapter;@Overrideprotected 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<ChildData> childList;List<ThirdData> 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 /3/21 0021.*/public class GroupAdapter extends BaseExpandableListAdapter {private Context mContext;private List<GroupData> groupDataList;public GroupAdapter(Context context, List<GroupData> groupDataList) {mContext = context;this.groupDataList = groupDataList;}@Overridepublic int getGroupCount() {return groupDataList.size();}@Overridepublic int getChildrenCount(int groupPosition) {return groupDataList.get(groupPosition).getChildDataList().size();}@Overridepublic Object getGroup(int groupPosition) {return groupDataList.get(groupPosition);}@Overridepublic Object getChild(int groupPosition, int childPosition) {return groupDataList.get(groupPosition).getChildDataList().size();}@Overridepublic long getGroupId(int groupPosition) {return groupPosition;}@Overridepublic long getChildId(int groupPosition, int childPosition) {return childPosition;}@Overridepublic boolean hasStableIds() {return true;}@Overridepublic 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;}@Overridepublic 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;}@Overridepublic 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 /3/21 0021.*/public class ChildAdapter extends BaseExpandableListAdapter {private Context mContext;private List<ChildData> dataList;public ChildAdapter(Context context, List<ChildData> dataList) {mContext = context;this.dataList = dataList;}@Overridepublic int getGroupCount() {return dataList.size();}@Overridepublic int getChildrenCount(int groupPosition) {return dataList.get(groupPosition).getThirdDataList().size();}@Overridepublic Object getGroup(int groupPosition) {return dataList.get(groupPosition).getTitle();}@Overridepublic Object getChild(int groupPosition, int childPosition) {return dataList.get(groupPosition).getThirdDataList().get(childPosition).getTitle();}@Overridepublic long getGroupId(int groupPosition) {return groupPosition;}@Overridepublic long getChildId(int groupPosition, int childPosition) {return childPosition;}@Overridepublic boolean hasStableIds() {return true;}@Overridepublic 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;}@Overridepublic 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;}@Overridepublic 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 /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);}@Overrideprotected 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);}}
