實現多級列表（二級列表嵌套）

效果圖：




實現步驟：

ExpandableListView 布局文件



2. 寫適配器??

3 適配器?



//嵌套的ExpandableListViewAdapter?

自定義?ExpandableListView條目顯示不全的問題


//2級 的適配器


//設置父標題


//子條目


//設置 字體


// 適配器 布局?

android:clickable="false"

android:focusable="false"

android:focusableInTouchMode="false"

//防止 父條目 不可點擊



package com.example.jixiaxian;

import android.os.Bundle;

import android.os.Handler;

import android.os.Message;

import android.support.v7.app.AppCompatActivity;

import android.support.v7.widget.LinearLayoutManager;

import android.support.v7.widget.RecyclerView;

import android.util.Log;

import android.view.View;

import android.widget.CheckBox;

import android.widget.ExpandableListView;

import com.google.gson.Gson;

import java.io.InputStream;

import java.net.HttpURLConnection;

import java.net.URL;

import java.util.ArrayList;

import java.util.List;

import butterknife.BindView;

import butterknife.ButterKnife;

public class Main4Activityextends AppCompatActivity {

@BindView(R.id.ed)

ExpandableListViewed;

Handlerh =new Handler() {

@Override

? ? ? ? public void handleMessage(Message msg) {

super.handleMessage(msg);

NewsGong xiao = (NewsGong) msg.obj;

initView(xiao);

}

};

private MyadbmyAdapter;

@Override

? ? protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main4);

ButterKnife.bind(this);

shuju();

}

private void shuju() {

new Thread() {

@Override

? ? ? ? ? ? public void run() {

super.run();

try {

URL url =new URL("http://172.16.54.31:8080/test/ff.txt");

HttpURLConnection uop = (HttpURLConnection) url.openConnection();

int responseCode = uop.getResponseCode();

if (responseCode ==200) {

InputStream inputStream = uop.getInputStream();

byte[] a =new byte[1024];

int a1 = -1;

StringBuffer stringBuffer =new StringBuffer();

while ((a1 = inputStream.read(a)) != -1) {

stringBuffer.append(new String(a,0, a1,"GBK"));

}

String s = stringBuffer.toString();

System.out.println(s);

Gson gson =new Gson();

Log.e("2222","run: " + s);

NewsGong xiao = gson.fromJson(s, NewsGong.class);

Message obtain = Message.obtain();

obtain.what =1;

obtain.obj = xiao;

h.sendMessage(obtain);

}

}catch (Exception e) {

e.printStackTrace();

}

}

}.start();

}

private void initView(NewsGong xiao) {

List child = xiao.getCHILD();

final Myeds myeds =new Myeds(child,this);

ed.setAdapter(myeds);

//設置 默認上下? 開關圖? 不可見

? ? ? ? ed.setGroupIndicator(null);

ed.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {

@Override

? ? ? ? ? ? public boolean onGroupClick(ExpandableListView parent, View v,int groupPosition,long id) {

//判斷 是否展開 設置 圖片樣子

? ? ? ? ? ? ? ? myeds.setSetBuon(!parent.isGroupExpanded(groupPosition));

return false;

}

});

}

}


//適配器

package com.example.jixiaxian;

import android.annotation.TargetApi;

import android.content.Context;

import android.os.Build;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.AbsListView;

import android.widget.BaseExpandableListAdapter;

import android.widget.CheckBox;

import android.widget.ExpandableListView;

import android.widget.ImageView;

import android.widget.TextView;

import java.util.ArrayList;

import java.util.List;

public class Myedsextends BaseExpandableListAdapter {

private Lists;

private Contextcontext;

private boolean bo;

public Myeds(List s, Context context) {

this.s = s;

this.context = context;

}

@Override

? ? public int getGroupCount() {

return s.size();

}

@Override

? ? public int getChildrenCount(int groupPosition) {

//這里 必須是 1? 要不里面2級數據 會 重復添加

? ? ? ? return 1;

}

@Override

? ? public Object getGroup(int groupPosition) {

return s.get(groupPosition);

}

@Override

? ? public Object getChild(int groupPosition,int childPosition) {

return s.get(groupPosition).getCHILD().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 true;

}

@Override

? ? public View getGroupView(int groupPosition,boolean isExpanded, View convertView, ViewGroup parent) {

ViewHodule hodule=null;

if(convertView==null){

convertView= LayoutInflater.from(context).inflate(R.layout.layout_item1,null);

hodule=new ViewHodule();

hodule.fs=convertView.findViewById(R.id.cbx);

hodule.zi=convertView.findViewById(R.id.zi);

convertView.setTag(hodule);

}else{

hodule = (ViewHodule) convertView.getTag();

}

hodule.zi.setText(s.get(groupPosition).getNAME());

//根據當前展開狀態 設置圖片 方向

? ? ? ? hodule.fs.setChecked(bo);

return convertView;

}

@Override

? ? public View getChildView(int groupPosition,int childPosition,boolean isLastChild, View convertView, ViewGroup parent) {

//嵌套ExpandableListView

? ? ? ? return? ? getGenericExpandableListView(s.get(groupPosition));

}

//嵌套ExpandableListView? 2級

? ? @TargetApi(Build.VERSION_CODES.JELLY_BEAN)

public ExpandableListView getGenericExpandableListView(NewsGong.CHILDBeanXX? college){

AbsListView.LayoutParams layoutParams =new AbsListView.LayoutParams(

ViewGroup.LayoutParams.MATCH_PARENT,

ViewGroup.LayoutParams.WRAP_CONTENT);

CustomExpandableListView view =new CustomExpandableListView(context);

// 加載2級的適配器

? ? ? ? final ClassesExpandableListViewAdapter adapter =new ClassesExpandableListViewAdapter(college.getCHILD(),context);

view.setAdapter(adapter);

view.setGroupIndicator(null);

view.setPadding(20,0,0,0);

view.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {

@Override

? ? ? ? ? ? public boolean onGroupClick(ExpandableListView parent, View v,int groupPosition,long id) {

//判斷 是否展開 設置 圖片樣子

? ? ? ? ? ? ? ? adapter.setSetBuon(!parent.isGroupExpanded(groupPosition),groupPosition);

return false;

}

});

return view;

}

@Override

? ? public boolean isChildSelectable(int groupPosition,int childPosition) {

return true;

}

//設置狀態? 是否展開

? ? public void setSetBuon(boolean b) {

bo =b;

}

class ViewHodule {

TextViewzi;

CheckBoxfs;

}

}


自定義?

public class CustomExpandableListViewextends 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) {

// 解決2級條目顯示不全的問題

? ? ? ? int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >>2

? ? ? ? ? ? ? ? , MeasureSpec.AT_MOST);

super.onMeasure(widthMeasureSpec, expandSpec);

}

}

//2級? 適配器

package com.example.jixiaxian;

import android.app.Activity;

import android.content.Context;

import android.graphics.Color;

import android.util.Log;

import android.view.Gravity;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.AbsListView;

import android.widget.BaseExpandableListAdapter;

import android.widget.CheckBox;

import android.widget.TextView;

import java.util.List;

public class ClassesExpandableListViewAdapterextends BaseExpandableListAdapter {

// 集合

? ? private Listclasses;

// 創建布局使用

? ? private Contextactivity;

private boolean but;

private int grs;

public ClassesExpandableListViewAdapter(List classes, Context activity) {

this.classes = classes;

this.activity = activity;

}

@Override

? ? public int getGroupCount() {

// 獲取一級條目的數量? 就是班級的大小

? ? ? ? return classes.size();

}

@Override

? ? public int getChildrenCount(int groupPosition) {

// 當它子空間沒有 數據時

? ? ? ? if(classes.get(groupPosition).getCHILD()!=null){

int size =classes.get(groupPosition).getCHILD().size();

Log.e("11111","getChildrenCount: "+size );

return classes.get(groupPosition).getCHILD().size();

}

return? 0;

}

@Override

? ? public Object getGroup(int groupPosition) {

// 獲取一級條目的對應數據

? ? ? ? return classes.get(groupPosition);

}

@Override

? ? public Object getChild(int groupPosition,int childPosition) {

// 獲取對應一級條目下二級條目的對應數據? 感覺沒什么用

? ? ? ? return classes.get(groupPosition).getCHILD().get(childPosition);

}

@Override

? ? public long getGroupId(int groupPosition) {

// 直接返回，沒什么用

? ? ? ? return groupPosition;

}

@Override

? ? public long getChildId(int groupPosition,int childPosition) {

// 直接返回，沒什么用

? ? ? ? return childPosition;

}

@Override

? ? public boolean hasStableIds() {

return false;

}

@Override

? ? public View getGroupView(int groupPosition,boolean isExpanded, View convertView, ViewGroup parent) {

// 獲取對應一級條目的View? 和ListView 的getView相似

? ? ? ? String leaf =classes.get(groupPosition).getLEAF();

//數據源里的? LEAF 是? 1? 是 沒有子數據? 2是 有數據

? ? ? ? ViewHodule hodule=null;

if("2".equals(leaf)){

View inflate = LayoutInflater.from(activity).inflate(R.layout.layout_item2,null);

CheckBox? checkBox = inflate.findViewById(R.id.cbx1);

TextView? viewById = inflate.findViewById(R.id.zi2);

//當點擊的 那個索引時才 打開圖片

? ? ? ? ? ? if(grs==groupPosition){

checkBox.setChecked(but);

}

viewById.setText(classes.get(groupPosition).getNAME());

return inflate;

}else{

return getGenericView(classes.get(groupPosition).getNAME());

}

}

public void setSetBuon(boolean b,int groupPosition) {

//是否展開狀態

? ? ? ? but=b;

//記錄索引

? ? ? ? grs=groupPosition;

}

class? ViewHodule{

TextViewzi1;

CheckBoxbox;

}

@Override

? ? public View getChildView(int groupPosition,int childPosition,boolean isLastChild, View convertView, ViewGroup parent) {

// 獲取對應二級條目的View? 和ListView 的getView相似

? ? ? ? return? getGenericView1(classes.get(groupPosition).getCHILD().get(childPosition).getNAME());

}

@Override

? ? public boolean isChildSelectable(int groupPosition,int childPosition) {

// 根據方法名，此處應該表示二級條目是否可以被點擊? 先返回true 再講

? ? ? ? return true;

}

/**

* 根據字符串生成布局，，因為我沒有寫layout.xml 所以用java 代碼生成

*

*? ? ? 實際中可以通過Inflate加載自己的自定義布局文件，設置數據之后并返回

? ? * @param string

? ? * @return

? ? */

? ? private TextView getGenericView(String string) {

AbsListView.LayoutParams layoutParams =new AbsListView.LayoutParams(

ViewGroup.LayoutParams.MATCH_PARENT,

ViewGroup.LayoutParams.WRAP_CONTENT);

TextView textView =new TextView(activity);

textView.setLayoutParams(layoutParams);

textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);

//設置? 北方大區? 左右距離

? ? ? ? textView.setPadding(180,30,0,30);

textView.setText(string);

textView.setTextSize(20);

textView.setTextColor(Color.BLACK);

return textView;

}

private TextView getGenericView1(String string) {

AbsListView.LayoutParams layoutParams =new AbsListView.LayoutParams(

ViewGroup.LayoutParams.MATCH_PARENT,

ViewGroup.LayoutParams.WRAP_CONTENT);

TextView textView =new TextView(activity);

textView.setLayoutParams(layoutParams);

textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);

//設置? 北方大區里第3級? 左右距離

? ? ? ? textView.setPadding(240,30,0,30);

textView.setText(string);

textView.setTextSize(20);

textView.setTextColor(Color.BLACK);

return textView;

}

}

<?xml version="1.0" encoding="utf-8"?>

? ? 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=".Main4Activity">

? ? ? ? android:id="@+id/ed"

? ? ? ? android:layout_width="match_parent"

? ? ? ? android:layout_height="match_parent">

//<?xml version="1.0" encoding="utf-8"?>

? ? android:layout_width="match_parent"

? ? android:orientation="horizontal"

? ? android:layout_height="wrap_content">

? ? ? ? android:id="@+id/cbx"

? ? ? ? android:layout_width="40dp"

? ? ? ? android:layout_height="40dp"

? ? ? ? android:button="@null"

? ? ? ? android:layout_gravity="center_vertical"

? ? ? ? android:clickable="false"

? ? ? ? android:focusable="false"

? ? ? ? android:focusableInTouchMode="false"

? ? ? ? android:background="@drawable/sub_square"/>

? ? android:id="@+id/li"

? ? android:layout_width="match_parent"

? ? android:orientation="horizontal"

? ? android:layout_height="wrap_content">

? ? ? ? android:id="@+id/zi"

? ? ? ? android:layout_width="match_parent"

? ? ? ? android:layout_height="wrap_content"

? ? ? ? android:padding="10dp"

? ? ? ? android:layout_gravity="center_vertical"

? ? ? ? android:layout_marginLeft="10dp"

? ? ? ? android:textSize="20sp"

? ? ? ? android:textColor="#222222"

? ? ? ? android:text="@string/app_name"/>

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