Android_ExpandableListView
Posted XiaoGao128
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实现效果: 类似于QQ联系人列表
相关属性:
- android:childDivider:指定各组内子类表项之间的分隔条,图片不会完全显示, 分离子列表项的是一条直线
- android:childIndicator:显示在子列表旁边的Drawable对象,可以是一个图像
- android:childIndicatorEnd:子列表项指示符的结束约束位置
- android:childIndicatorLeft:子列表项指示符的左边约束位置
- android:childIndicatorRight:子列表项指示符的右边约束位置
- android:childIndicatorStart:子列表项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:组列表项指示器的结束约束位置
- android:indicatorLeft:组列表项指示器的左边约束位置
- android:indicatorRight:组列表项指示器的右边约束位置
- android:indicatorStart:组列表项指示器的开始约束位置
核心是重写BaseExpandableListAdpter
layout_item.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="match_parent" > <ImageView android:id="@+id/item_iv" android:layout_width="90dp" android:layout_height="90dp" android:src="@drawable/sor" android:focusable="false" android:layout_margin="20dp"></ImageView> <TextView android:id="@+id/item_tv" android:layout_width="match_parent" android:layout_height="90dp" android:text="item1" android:textSize="25dp" android:gravity="center_vertical" android:layout_margin="20dp" android:focusable="false"></TextView> </LinearLayout>
item_group.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <TextView android:id="@+id/tv_group" android:layout_width="match_parent" android:layout_height="90dp" android:text="数学" android:paddingLeft="50dp" android:gravity="center_vertical" android:background="@drawable/btn_nocornor" android:textSize="25dp" ></TextView> </LinearLayout>
mainActivity.xml
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".ExpandableView.ExpandableViewActivity"> <ExpandableListView android:id="@+id/expad_view" android:layout_width="match_parent" android:layout_height="match_parent" android:childDivider="#212"></ExpandableListView> </RelativeLayout>
MyBaseExpandableListAdapter
package com.example.myapplication5.ExpandableView; import android.content.ClipData; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseExpandableListAdapter; import android.widget.ImageView; import android.widget.TextView; import com.example.myapplication5.R; import java.security.acl.Group; import java.util.ArrayList; public class MyBaseExpandableListAdapter extends BaseExpandableListAdapter { private ArrayList<String> gData; private ArrayList<ArrayList<String[]>> iData; private Context mContext; public MyBaseExpandableListAdapter(ArrayList<String> gData, ArrayList<ArrayList<String[]>> iData,Context mContext){ this.gData=gData; this.iData=iData; this.mContext=mContext; } @Override public int getGroupCount() { return gData.size(); } @Override public int getChildrenCount(int groupPosition) { return iData.get(groupPosition).size(); } @Override public Object getGroup(int groupPosition) { return gData.get(groupPosition); } @Override public Object getChild(int groupPosition, int childPosition) { return iData.get(groupPosition).get(childPosition); } @Override public long getGroupId(int groupPosition) { return groupPosition; } @Override public long getChildId(int groupPosition, int childPosition) { return childPosition; } @Override public boolean hasStableIds() { return false; } @Override public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { ViewHolderGroup viewHolderGroup; if (convertView==null){ convertView= LayoutInflater.from(mContext).inflate(R.layout.layout_item_expanda_group,parent,false); viewHolderGroup=new ViewHolderGroup(); viewHolderGroup.tv_g_name=convertView.findViewById(R.id.tv_group); convertView.setTag(viewHolderGroup); }else { viewHolderGroup= (ViewHolderGroup) convertView.getTag(); } viewHolderGroup.tv_g_name.setText(gData.get(groupPosition)); return convertView; } @Override public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { ViewHolderItem viewHolderItem; if (convertView==null){ convertView=LayoutInflater.from(mContext).inflate(R.layout.layout_item_expanda_item,parent,false); viewHolderItem=new ViewHolderItem(); viewHolderItem.tv_it_name=convertView.findViewById(R.id.item_tv); viewHolderItem.iv_it_head=convertView.findViewById(R.id.item_iv); convertView.setTag(viewHolderItem); }else { viewHolderItem= (ViewHolderItem) convertView.getTag(); } String[] strings=iData.get(groupPosition).get(childPosition); viewHolderItem.tv_it_name.setText(strings[0]); viewHolderItem.iv_it_head.setImageResource(Integer.parseInt(strings[1])); return convertView; } @Override public boolean isChildSelectable(int groupPosition, int childPosition) { return true; } private static class ViewHolderGroup{ private TextView tv_g_name; } private static class ViewHolderItem{ private TextView tv_it_name; private ImageView iv_it_head; } }
MainActivity
package com.example.myapplication5.ExpandableView; import androidx.appcompat.app.AppCompatActivity; import android.content.ClipData; import android.content.Context; import android.os.Bundle; import android.widget.ExpandableListView; import com.example.myapplication5.R; import java.security.acl.Group; import java.util.ArrayList; public class ExpandableViewActivity extends AppCompatActivity { private ArrayList<String> gData=null; private ArrayList<ArrayList<String[]>> iData=null; private ArrayList<String[]> ldata=null; private Context mcontext; private ExpandableListView expandableListView; private MyBaseExpandableListAdapter myAdapter = null; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_expandable_view); expandableListView=findViewById(R.id.expad_view); gData=new ArrayList<String>(); iData=new ArrayList<ArrayList<String[]>>(); ldata=new ArrayList<String[]>(); gData.add("康师傅"); gData.add("今麦郎"); gData.add("上品"); ldata.add(new String[]{"红烧牛肉面",(""+R.drawable.sor)}); ldata.add(new String[]{"老坛酸菜牛肉面",(""+R.drawable.sor)}); iData.add(ldata); ldata=new ArrayList<>(); ldata.add(new String[]{"西红柿鸡蛋打卤面",(""+R.drawable.sor)}); ldata.add(new String[]{"酸豆角牛肉面",(""+R.drawable.sor)}); iData.add(ldata); ldata=new ArrayList<>(); ldata.add(new String[]{"香辣牛肉面",""+R.drawable.sor}); iData.add(ldata); myAdapter=new MyBaseExpandableListAdapter(gData,iData,getApplicationContext()); expandableListView.setAdapter(myAdapter); } }
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