Android：BaseMultiItemQuickAdapter打造嵌套/多级列表
16lz
2022-04-04
效果图：
1 引入库
implementation 'com.github.CymChad:BaseRecyclerViewAdapterHelper:2.9.46'2 对象bean
一级列表：
package com.lucas.yanfriends.model.YanNew.select;import com.chad.library.adapter.base.entity.AbstractExpandableItem;import com.chad.library.adapter.base.entity.MultiItemEntity;import java.io.Serializable;import static com.lucas.yanfriends.ui.selectSchoolMajor.adapter.MajorSmallAdapter.ITEM_FIRST_LEVEL;public class MajorMainBean extends AbstractExpandableItem implements Serializable , MultiItemEntity { private String major_main_name; public MajorMainBean(String major_main_name) { this.major_main_name = major_main_name; } public String getMajor_main_name() { return major_main_name; } public void setMajor_main_name(String major_main_name) { this.major_main_name = major_main_name; } @Override public int getItemType() { return ITEM_FIRST_LEVEL; } @Override public int getLevel() { return 0; }} 二级列表：
package com.lucas.yanfriends.model.YanNew.select;import com.chad.library.adapter.base.entity.MultiItemEntity;import java.io.Serializable;import static com.lucas.yanfriends.ui.selectSchoolMajor.adapter.MajorSmallAdapter.ITEM_FIRST_LEVEL;import static com.lucas.yanfriends.ui.selectSchoolMajor.adapter.MajorSmallAdapter.ITEM_SECOND_LEVEL;public class MajorSmallBean implements Serializable , MultiItemEntity { private int major_id; private String major_name; private int major_bbsid; private int major_pid; private String major_pname; public int getMajor_id() { return major_id; } public void setMajor_id(int major_id) { this.major_id = major_id; } public String getMajor_name() { return major_name; } public void setMajor_name(String major_name) { this.major_name = major_name; } public int getMajor_bbsid() { return major_bbsid; } public void setMajor_bbsid(int major_bbsid) { this.major_bbsid = major_bbsid; } public int getMajor_pid() { return major_pid; } public void setMajor_pid(int major_pid) { this.major_pid = major_pid; } public String getMajor_pname() { return major_pname; } public void setMajor_pname(String major_pname) { this.major_pname = major_pname; } @Override public int getItemType() { return ITEM_SECOND_LEVEL; }}3 一/二级列表的布局
一级列表的布局：
<?xml version="1.0" encoding="utf-8"?> 二级列表的布局：<?xml version="1.0" encoding="utf-8"?> 4 Adapter
package com.lucas.yanfriends.ui.selectSchoolMajor.adapter;import android.support.annotation.Nullable;import com.chad.library.adapter.base.BaseMultiItemQuickAdapter;import com.chad.library.adapter.base.BaseViewHolder;import com.chad.library.adapter.base.entity.MultiItemEntity;import com.lucas.yanfriends.R;import com.lucas.yanfriends.model.YanNew.select.MajorMainBean;import com.lucas.yanfriends.model.YanNew.select.MajorSmallBean;import java.util.List;public class MajorSmallAdapter extends BaseMultiItemQuickAdapter { public static final int ITEM_FIRST_LEVEL = 1; public static final int ITEM_SECOND_LEVEL = 2; public MajorSmallAdapter(@Nullable List data) { super(data); addItemType(ITEM_FIRST_LEVEL, R.layout.list_main_major_item); addItemType(ITEM_SECOND_LEVEL, R.layout.list_small_major_item); } @Override protected void convert(BaseViewHolder helper, MultiItemEntity item) { switch (helper.getItemViewType()) { case ITEM_FIRST_LEVEL: final MajorMainBean item_temp = (MajorMainBean) item; helper.setText(R.id.tv_name, item_temp.getMajor_main_name()); helper.itemView.setOnClickListener(v -> { int pos = helper.getAdapterPosition(); if (item_temp.isExpanded()) { collapse(pos); } else { expand(pos); } }); break; case ITEM_SECOND_LEVEL: final MajorSmallBean item_temp2 = (MajorSmallBean) item; helper.setText(R.id.tv_name, item_temp2.getMajor_name()); break; } }} 5 activty中的设置
5.1 适配器
//--------------------------列表适配器-------------------------- //Adapter适配器初始化 recycle.setLayoutManager(new LinearLayoutManager(mContext)); //设置列表默认动画效果 recycle.setItemAnimator(new DefaultItemAnimator()); //绑定适配器 majorSmallAdapter = new MajorSmallAdapter(list_MajorBean); recycle.setAdapter(majorSmallAdapter); //列表点击事件 majorSmallAdapter.setOnItemClickListener(new BaseQuickAdapter.OnItemClickListener() { @Override public void onItemClick(BaseQuickAdapter adapter, View view, int position) { } }); //--------------------------适配器--------------------------5.2 数据填充
for (MultiItemEntity multiItemEntity : list_MajorBean_beifen) { MajorSmallBean majorSamllBean = ((MajorSmallBean) multiItemEntity); if (temp_class != majorSamllBean.getMajor_pid()) { MajorMainBean majorMainBean = new MajorMainBean(majorSamllBean.getMajor_name()); temp_class = majorSamllBean.getMajor_pid(); for (MultiItemEntity multiItemEntity2 : list_MajorBean_beifen) { MajorSmallBean majorSamllBean2 = ((MajorSmallBean) multiItemEntity2); if (majorSamllBean2.getMajor_pid() == temp_class) { majorMainBean.addSubItem(majorSamllBean2); } } list_MajorBean.add(majorMainBean); } }
关于数据的构造，简化下来如下：
List data = new ArrayList<>(); for (int i = 0; i < lvCount; i++) { ExpandItem item0 = new ExpandItem("一级列表标题" + i); for (int j = 0; j < lv1Count; j++) { Expand1Item item1 = new Expand1Item("二级列表标题" + j); for (int k = 0; k < lv2Count; k++) { item1.addSubItem(new Expand2Item("三级列表标题" + k)); } item0.addSubItem(item1); } data.add(item0); }
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