ListView分组，类似联系人分组

现在网上的关于ListView分组都不知道扯什么鬼，所以有必要写一个Demo出来，福利大家

主要思想：通过对比 分组的栏目是否一样来是否隐藏该position的栏目，直接贴代码，简单明了

1、MainActivity

package com.yongbiao.testlistviewsection;

import android.content.Context;
import android.text.TextUtils;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import java.util.HashMap;
import java.util.List;

/**
* Created by Administrator on 2016/3/21.
*/
public class ContactAdapter extends BaseAdapter {

private final HashMap<Object, Object> indexes;
private final String[] sections;
private Context mContext;
private List<People> mList ;
private LayoutInflater inflater;

private OnPeopleClickListener onPeopleClickListener ;

public ContactAdapter(Context mContext, List<People> mList) {
this.mContext = mContext;
this.mList = mList;
this.inflater = LayoutInflater.from(mContext);
int size = mList.size();
indexes = new HashMap<>();
sections = new String[size];
for (int index = 0; index < size; index++){
//当前
String currentFirstName = mList.get(index).getFirstName();
//上个
String previousFirstName = index >= 1 ? mList.get(index-1).getFirstName() : "";
if (!TextUtils.equals(currentFirstName, previousFirstName)){
indexes.put(currentFirstName, index);
sections[index] = currentFirstName;
}
}
}

public void appendPeople(People people) {
mList.add(people);
this.notifyDataSetChanged();
}

@Override
public int getCount() {
return mList == null ? 0: mList.size();
}

@Override
public Object getItem(int position) {
return mList == null ? null : mList.get(position);
}

@Override
public long getItemId(int position) {
return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
ContactViewHolder holder ;
if (convertView == null){
convertView = inflater.inflate(R.layout.item, parent, false);
holder = new ContactViewHolder();
holder.tvFirstName = (TextView) convertView.findViewById(R.id.tv_item_first);
holder.tvLastName = (TextView) convertView.findViewById(R.id.tv_item_second);
convertView.setTag(holder);
}else{
holder = (ContactViewHolder) convertView.getTag();
}

if (position >= 0){

final String lastName = mList.get(position).getLastName() ;
holder.tvLastName.setText(lastName);
final String currentFirstName = mList.get(position).getFirstName() ;
String previousFirstName = position >= 1 ? mList.get(position-1).getFirstName() : "";
if (!TextUtils.equals(currentFirstName, previousFirstName)) {
holder.tvFirstName.setVisibility(View.VISIBLE);
holder.tvFirstName.setText(currentFirstName);
} else {
holder.tvFirstName.setVisibility(View.GONE);
}

holder.tvLastName.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (onPeopleClickListener != null){
onPeopleClickListener.onPeopleClick(currentFirstName,lastName);
}
}
});
}
return convertView;
}

public void setOnPeopleClickListener (OnPeopleClickListener mOnPeopleClickListener) {
this.onPeopleClickListener = mOnPeopleClickListener ;
}

public static class ContactViewHolder{
TextView tvFirstName;
TextView tvLastName;
}

public interface OnPeopleClickListener{
void onPeopleClick(String firstName,String lastName);
}
}

实体类People

package com.yongbiao.testlistviewsection;

/**
* Created by Administrator on 2016/3/21.
*/
public class People {
private String firstName ;
private String lastName ;

public People(String firstName, String lastName) {
this.firstName = firstName;
this.lastName = lastName;
}

public String getFirstName() {
return firstName;
}

public String getLastName() {
return lastName;
}
}

适配器adapter

package com.yongbiao.testlistviewsection;

import android.content.Context;
import android.text.TextUtils;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import java.util.HashMap;
import java.util.List;

/**
* Created by Administrator on 2016/3/21.
*/
public class ContactAdapter extends BaseAdapter {

private final HashMap<Object, Object> indexes;
private final String[] sections;
private Context mContext;
private List<People> mList ;
private LayoutInflater inflater;

private OnPeopleClickListener onPeopleClickListener ;

public ContactAdapter(Context mContext, List<People> mList) {
this.mContext = mContext;
this.mList = mList;
this.inflater = LayoutInflater.from(mContext);
int size = mList.size();
indexes = new HashMap<>();
sections = new String[size];
for (int index = 0; index < size; index++){
//当前
String currentFirstName = mList.get(index).getFirstName();
//上个
String previousFirstName = index >= 1 ? mList.get(index-1).getFirstName() : "";
if (!TextUtils.equals(currentFirstName, previousFirstName)){
indexes.put(currentFirstName, index);
sections[index] = currentFirstName;
}
}
}

public void appendPeople(People people) {
mList.add(people);
this.notifyDataSetChanged();
}

@Override
public int getCount() {
return mList == null ? 0: mList.size();
}

@Override
public Object getItem(int position) {
return mList == null ? null : mList.get(position);
}

@Override
public long getItemId(int position) {
return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
ContactViewHolder holder ;
if (convertView == null){
convertView = inflater.inflate(R.layout.item, parent, false);
holder = new ContactViewHolder();
holder.tvFirstName = (TextView) convertView.findViewById(R.id.tv_item_first);
holder.tvLastName = (TextView) convertView.findViewById(R.id.tv_item_second);
convertView.setTag(holder);
}else{
holder = (ContactViewHolder) convertView.getTag();
}

if (position >= 0){

final String lastName = mList.get(position).getLastName() ;
holder.tvLastName.setText(lastName);
final String currentFirstName = mList.get(position).getFirstName() ;
String previousFirstName = position >= 1 ? mList.get(position-1).getFirstName() : "";
if (!TextUtils.equals(currentFirstName, previousFirstName)) {
holder.tvFirstName.setVisibility(View.VISIBLE);
holder.tvFirstName.setText(currentFirstName);
} else {
holder.tvFirstName.setVisibility(View.GONE);
}

holder.tvLastName.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (onPeopleClickListener != null){
onPeopleClickListener.onPeopleClick(currentFirstName,lastName);
}
}
});
}
return convertView;
}

public void setOnPeopleClickListener (OnPeopleClickListener mOnPeopleClickListener) {
this.onPeopleClickListener = mOnPeopleClickListener ;
}

public static class ContactViewHolder{
TextView tvFirstName;
TextView tvLastName;
}

public interface OnPeopleClickListener{
void onPeopleClick(String firstName,String lastName);
}
}

布局MainActivity

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">

<Button android:id="@+id/add"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="add"/>

<ListView android:id="@+id/lv"
android:layout_below="@+id/add"
android:layout_width="match_parent"
android:layout_height="match_parent"></ListView>

</RelativeLayout>

item

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
tools:ignore="RtlHardcoded">

<TextView
android:id="@+id/tv_item_first"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="18sp"
android:clickable="false"/>

<TextView
android:id="@+id/tv_item_second"
android:layout_width="match_parent"
android:layout_height="48dp"
android:paddingLeft="16dp"
android:paddingRight="10dp"
android:background="?android:attr/selectableItemBackground"
android:clickable="true"
android:gravity="center_vertical"
android:textSize="16dp" />
<View
android:layout_width="match_parent"
android:layout_height="1px"
android:layout_marginLeft="16dp"
android:layout_marginRight="10dp"
android:background="#000000"/>
</LinearLayout>

这就是所有的代码了，非常简单，而且很适用多种情况