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完美实现ExpandableListView二级分栏效果
来源：jb51　　时间：2018/11/22 9:59:11　　对本文有异议

本文实例为大家分享了ExpandableListView二级分栏效果的具体代码，供大家参考，具体内容如下

对ExpandableListView控件进行封装（未自定义）直接上代码：

通用ViewHolder类，仅在setImageResource中添加代码

  1. package com.svp.haoyan.expandablelistview.tool;
  2.  
  3. import android.content.Context;
  4. import android.graphics.Bitmap;
  5. import android.util.SparseArray;
  6. import android.view.LayoutInflater;
  7. import android.view.View;
  8. import android.view.ViewGroup;
  9. import android.widget.ImageView;
  10. import android.widget.TextView;
  11.  
  12. /**
  13.  * Created by haoyan on 2016/3/24.
  14.  */
  15. public class ViewHolder {
  16.  //存储数据
  17.  private SparseArray<View> mViews;
  18.  
  19.  private int mPosition;
  20.  private View mConvertView;
  21.  private boolean misExpanded;
  22.  public ViewHolder(Context context, ViewGroup parent, int layoutId, int position,boolean isExpanded) {
  23.  
  24.   this.mPosition=position;
  25.   this.mViews= new SparseArray<View>();
  26.   this.misExpanded=isExpanded;
  27.   //三
  28.   mConvertView= LayoutInflater.from(context).inflate(layoutId,parent,false);
  29.   //一
  30.   mConvertView.setTag(this);
  31.  }
  32.  public static ViewHolder get(Context context,View convertView,
  33.          ViewGroup parent,int layoutId,int position,boolean isExpanded){
  34.  
  35.   if (convertView==null){
  36.    return new ViewHolder(context,parent,layoutId,position,isExpanded);
  37.   }else {
  38.    //五 六
  39.    ViewHolder holder=(ViewHolder)convertView.getTag();
  40.    holder.mPosition=position;
  41.    return holder;
  42.   }
  43.  }
  44.  //通过viewId获取控件
  45.  //泛型T返回子类
  46.  public <T extends View> T getView(int viewId){
  47.  
  48.   View view =mViews.get(viewId);
  49.   if (view==null){
  50.    //四
  51.    view=mConvertView.findViewById(viewId);
  52.    mViews.put(viewId,view);
  53.   }
  54.   return (T)view;
  55.  }
  56.  //八
  57.  public View getmConvertView() {
  58.   return mConvertView;
  59.  }
  60.  
  61.  /**
  62.   * 设置TextView的值
  63.   * @param viewId
  64.   * @param text
  65.   * @return
  66.   */
  67.  //四 七 九
  68.  public ViewHolder setText(int viewId,String text){
  69.   TextView tv= getView(viewId);
  70.   tv.setText(text);
  71.   return this;
  72.  }
  73.  /**
  74.   * 一参传id，二参传图片地址，三参为true则调用点击变化效果，默认为false.
  75.   * */
  76.  public ViewHolder setImageResource(int viewId,int resId,boolean expanded){
  77.   ImageView view= getView(viewId);
  78.   view.setImageResource(resId);
  79.   if (expanded){
  80.    if (misExpanded){
  81.     view.setVisibility(View.GONE);
  82.    }else {
  83.     view.setVisibility(View.VISIBLE);
  84.    }
  85.   }
  86.   return this;
  87.  }
  88.  public ViewHolder setImageBitamp(int viewId,Bitmap bitmap){
  89.   ImageView view= getView(viewId);
  90.   view.setImageBitmap(bitmap);
  91.   return this;
  92.  }
  93.  public ViewHolder setImageURI(int viewId,String uri){
  94.   ImageView view= getView(viewId);
  95. //  Imageloader.getInstance().loadImg(view,uri);
  96.   return this;
  97.  }
  98.  
  99. }
  100.  

实体类Expand_DTO:

  1. package com.svp.haoyan.expandablelistview.dto;
  2.  
  3. /**
  4.  * Created by haoyan on 2016/5/7.
  5.  */
  6. public class Expand_DTO {
  7.  
  8.  private String name;
  9.  private String contents;
  10.  private int pic;
  11.  private int photo;
  12.  
  13.  public static class Expand_child {
  14.   private String childname;
  15.   private String childcont;
  16.  
  17.   public String getChildname() {
  18.    return childname;
  19.   }
  20.  
  21.   public void setChildname(String childname) {
  22.    this.childname = childname;
  23.   }
  24.  
  25.   public String getChildcont() {
  26.    return childcont;
  27.   }
  28.  
  29.   public void setChildcont(String childcont) {
  30.    this.childcont = childcont;
  31.   }
  32.  }
  33.  public String getName() {
  34.   return name;
  35.  }
  36.  
  37.  public void setName(String name) {
  38.   this.name = name;
  39.  }
  40.  
  41.  public String getContents() {
  42.   return contents;
  43.  }
  44.  
  45.  public void setContents(String contents) {
  46.   this.contents = contents;
  47.  }
  48.  
  49.  public int getPic() {
  50.   return pic;
  51.  }
  52.  
  53.  public void setPic(int pic) {
  54.   this.pic = pic;
  55.  }
  56.  
  57.  public int getPhoto() {
  58.   return photo;
  59.  }
  60.  
  61.  public void setPhoto(int photo) {
  62.   this.photo = photo;
  63.  }
  64.  
  65.  
  66. }

接下来是最主要的Adapter：

  1. package com.svp.haoyan.expandablelistview;
  2.  
  3. import android.content.Context;
  4. import android.database.DataSetObserver;
  5. import android.view.View;
  6. import android.view.ViewGroup;
  7. import android.widget.ExpandableListAdapter;
  8.  
  9. import com.svp.haoyan.expandablelistview.tool.ViewHolder;
  10.  
  11. import java.util.List;
  12. import java.util.Map;
  13.  
  14. /**
  15.  * Created by haoyan on 2016/4/28.
  16.  */
  17. public abstract class MyExpandableListAdapter<T,F>implements ExpandableListAdapter {
  18.  private Context mcontext;
  19.  private List<T> mexpand_dtos;
  20.  private Map<Integer, List<F>> mmap = null;
  21.  public MyExpandableListAdapter(Context context, List<T> expand_dtos,Map<Integer, List<F>> map) {
  22.   this.mcontext = context;
  23.   this.mexpand_dtos = expand_dtos;
  24.   this.mmap=map;
  25.  }
  26.  /*注册一个观察者(observer)，当此适配器数据修改时即调用此观察者。*/
  27.  @Override
  28.  public void registerDataSetObserver(DataSetObserver observer) {
  29.  
  30.  }
  31.  /*取消先前通过registerDataSetObserver(DataSetObserver)方式注册进该适配器中的观察者对象*/
  32.  @Override
  33.  public void unregisterDataSetObserver(DataSetObserver observer) {
  34.  
  35.  }
  36.  /*获取组的个数*/
  37.  @Override
  38.  public int getGroupCount() {
  39.   return mexpand_dtos.size();
  40.  }
  41.  /*返回在指定Group的Child数目。*/
  42.  @Override
  43.  public int getChildrenCount(int groupPosition) {
  44.   return mmap.get(groupPosition).size();
  45.  }
  46.  //获取当前父item的数据
  47.  @Override
  48.  public T getGroup(int groupPosition) {
  49.   return mexpand_dtos.get(groupPosition);
  50.  }
  51.  /*获取与在指定group给予child相关的数据。*/
  52.  @Override
  53.  public F getChild(int groupPosition, int childPosition) {
  54.   return (mmap.get(groupPosition).get(childPosition));
  55.  }
  56.  /*获取指定组的ID*/
  57.  @Override
  58.  public long getGroupId(int groupPosition) {
  59.   return groupPosition;
  60.  }
  61.  //得到子item的ID
  62.  @Override
  63.  public long getChildId(int groupPosition, int childPosition) {
  64.   return childPosition;
  65.  }
  66.  //组和子元素是否持有稳定的ID,也就是底层数据的改变不会影响到它们。(没效果)
  67.  @Override
  68.  public boolean hasStableIds() {
  69.   return true;
  70.  }
  71.  //设置父item组件
  72.  @Override
  73.  public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
  74.   ViewHolder viewHolder = ViewHolder.get(mcontext, convertView, parent, R.layout.expand_groupview, groupPosition,isExpanded);
  75.   convert(viewHolder, getGroup(groupPosition));
  76.   return viewHolder.getmConvertView();
  77.  }
  78.  //自己写
  79.  public abstract void convert(ViewHolder viewHolder, T t);
  80.  
  81.  public abstract void convertchild(ViewHolder viewHolder, F f);
  82.  //设置子item的组件
  83.  @Override
  84.  public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
  85.   ViewHolder viewHolder = ViewHolder.get(mcontext, convertView, parent, R.layout.expand_childview, groupPosition,isLastChild);
  86.   convertchild(viewHolder, getChild(groupPosition,childPosition));
  87.   return viewHolder.getmConvertView();
  88.   /*子元素是否处于组中的最后一个(对每个组的最后一个进行操作)*/
  89.   //boolean isLastChild
  90.   /*下边是未封装代码，提供参考*/
  91. //  String Childname = (mmap.get(groupPosition).get(childPosition)).getChildname();
  92. //  LayoutInflater inflater = (LayoutInflater)mcontext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
  93. //  convertView = inflater.inflate(R.layout.expand_childview, null);
  94. //  TextView tv_child = (TextView) convertView.findViewById(R.id.tv_child);
  95. //  tv_child.setText(Childcont);
  96.  }
  97.  /*是否选中指定位置上的子元素。*/
  98.  @Override
  99.  public boolean isChildSelectable(int groupPosition, int childPosition) {
  100.   return true;
  101.  }
  102.  /*true所有条目可以选择和点击*/
  103.  @Override
  104.  public boolean areAllItemsEnabled() {
  105.   return false;
  106.  }
  107.  /*如果当前适配器不包含任何数据则返回True。经常用来决定一个空视图是否应该被显示。
  108.  一个典型的实现将返回表达式getCount() == 0的结果，但是由于getCount()包含了头部和尾部，适配器可能需要不同的行为。*/
  109.  @Override
  110.  public boolean isEmpty() {
  111.   return false;
  112.  }
  113.  /*当组展开状态的时候此方法被调用。*/
  114.  @Override
  115.  public void onGroupExpanded(int groupPosition) {
  116.  
  117.  }
  118.  /*当组收缩状态的时候此方法被调用。*/
  119.  @Override
  120.  public void onGroupCollapsed(int groupPosition) {
  121.  
  122.  }
  123.  /*根据所给的子ID号和组ID号返回唯一的ID。此外，若hasStableIds()是true，那么必须要返回稳定的ID。*/
  124.  @Override
  125.  public long getCombinedChildId(long groupId, long childId) {
  126.   return 0;
  127.  }
  128.  /*同上*/
  129.  @Override
  130.  public long getCombinedGroupId(long groupId) {
  131.   return 0;
  132.  }
  133. }
  134.  

最后是调用类Activity:

  1. package com.svp.haoyan.expandablelistview;
  2.  
  3. import android.os.Bundle;
  4. import android.support.v7.app.AppCompatActivity;
  5. import android.widget.ExpandableListView;
  6.  
  7. import com.svp.haoyan.expandablelistview.dto.Expand_DTO;
  8. import com.svp.haoyan.expandablelistview.tool.ViewHolder;
  9.  
  10. import java.util.ArrayList;
  11. import java.util.HashMap;
  12. import java.util.List;
  13.  
  14. public class MainActivity extends AppCompatActivity {
  15.  private ExpandableListView elistview;
  16.  private List<Expand_DTO> expanddata;
  17.  private HashMap<Integer, List<Expand_DTO.Expand_child>> map = null;
  18.  
  19.  @Override
  20.  protected void onCreate(Bundle savedInstanceState) {
  21.   super.onCreate(savedInstanceState);
  22.   setContentView(R.layout.activity_main);
  23.   dataView();
  24.   expandView();
  25.  }
  26.  
  27.  private void expandView() {
  28.   elistview = (ExpandableListView) findViewById(R.id.expandable_lv);
  29.   elistview.setAdapter(new MyExpandableListAdapter<Expand_DTO,Expand_DTO.Expand_child>(this, expanddata,map) {
  30.    @Override
  31.    public void convert(ViewHolder viewHolder, Expand_DTO expand_dto) {
  32.     viewHolder.setText(R.id.tv_expand, expand_dto.getName())
  33.       .setText(R.id.tv_expand_two, expand_dto.getContents())
  34.       .setImageResource(R.id.img_expand, expand_dto.getPic(),false)
  35.       .setImageResource(R.id.img_expand_two, expand_dto.getPhoto(),false);
  36.    }
  37.  
  38.    @Override
  39.    public void convertchild(ViewHolder viewHolder, Expand_DTO.Expand_child expand_child) {
  40.     viewHolder.setText(R.id.tv_child,expand_child.getChildname())
  41.        .setText(R.id.tv_child2,expand_child.getChildcont());
  42.    }
  43.   });
  44.   //去掉自带箭头
  45.   elistview.setGroupIndicator(null);
  46.  }
  47.  
  48.  private void dataView() {
  49.   expanddata = new ArrayList<Expand_DTO>();
  50.   Expand_DTO bean_zero = new Expand_DTO();
  51.   bean_zero.setName("android新技能1");
  52.   bean_zero.setContents("1");
  53.   bean_zero.setPic(R.drawable.icon_check);
  54.   bean_zero.setPhoto(R.drawable.travel_airfare_cn_position);
  55.   expanddata.add(bean_zero);
  56.  
  57.   Expand_DTO bean_one = new Expand_DTO();
  58.   bean_one.setName("android新技能2");
  59.   bean_one.setContents("2");
  60.   bean_one.setPic(R.drawable.icon_check);
  61.   bean_one.setPhoto(R.drawable.travel_airfare_cn_position);
  62.   expanddata.add(bean_one);
  63.  
  64.   Expand_DTO bean_two = new Expand_DTO();
  65.   bean_two.setName("android新技能3");
  66.   bean_two.setContents("3");
  67.   bean_two.setPic(R.drawable.icon_check);
  68.   bean_two.setPhoto(R.drawable.travel_airfare_cn_position);
  69.   expanddata.add(bean_two);
  70.  
  71.   //这里可以使用SparseArray优化性能
  72.   map = new HashMap<Integer, List<Expand_DTO.Expand_child>>();
  73.   List<Expand_DTO.Expand_child> expand_children_zero=new ArrayList<Expand_DTO.Expand_child>();
  74.   Expand_DTO.Expand_child child1=new Expand_DTO.Expand_child();
  75.   child1.setChildname("11111");
  76.   child1.setChildcont("22222");
  77.   expand_children_zero.add(child1);
  78.  
  79.   Expand_DTO.Expand_child child2=new Expand_DTO.Expand_child();
  80.   child2.setChildname("3333333");
  81.   child2.setChildcont("4444444");
  82.   expand_children_zero.add(child2);
  83.   map.put(0,expand_children_zero);
  84.  
  85.   List<Expand_DTO.Expand_child> expand_children_one=new ArrayList<Expand_DTO.Expand_child>();
  86.   Expand_DTO.Expand_child child3=new Expand_DTO.Expand_child();
  87.   child3.setChildname("55555");
  88.   child3.setChildcont("66666");
  89.   expand_children_one.add(child3);
  90.  
  91.   Expand_DTO.Expand_child child4=new Expand_DTO.Expand_child();
  92.   child4.setChildname("77777");
  93.   child4.setChildcont("88888");
  94.   expand_children_one.add(child4);
  95.   map.put(1,expand_children_one);
  96.  
  97.   List<Expand_DTO.Expand_child> children_data_two=new ArrayList<Expand_DTO.Expand_child>();
  98.   Expand_DTO.Expand_child child5=new Expand_DTO.Expand_child();
  99.   child5.setChildname("99999");
  100.   child5.setChildcont("00000");
  101.   children_data_two.add(child5);
  102.  
  103.   Expand_DTO.Expand_child child6=new Expand_DTO.Expand_child();
  104.   child6.setChildname("12345");
  105.   child6.setChildcont("54321");
  106.   children_data_two.add(child6);
  107.   map.put(2,children_data_two);
  108.  
  109.  }
  110. }

完活布局很简单就不贴出来了，加上图片有图有真相：

源码下载：ExpandableListView二级分栏效果

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持w3xue。

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