ListView头尾简介Header/Footer

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内容：以前只会用ListView显示数据，最近才知道还有头尾一说。学会了头尾可以很方便的设置一些需要的布局

步骤：

1、布局添加ListView

2、添加头尾的item，xml文件布局

3、调用listview的addHeaderView(mHeader)和addFooterView(mFooter)添加上头尾

4、listView添加适配器和设置按键监听

代码如下：

1、主界面布局（listView）

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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="com.example.hello.listviewhead.MainActivity">

    <ListView
        android:id="@+id/list_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    </ListView>

</android.support.constraint.ConstraintLayout>

2、头尾item布局

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

    <ImageView
        android:id="@+id/image_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@mipmap/ic_launcher"/>

    <ImageView
        android:id="@+id/image_view2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@mipmap/ic_launcher"/>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:id="@+id/image_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@mipmap/ic_launcher"/>
</android.support.constraint.ConstraintLayout>

3、实现代码

package com.example.hello.listviewhead;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity implements AdapterView.OnItemClickListener{

    private ListView mListView;
    private View mHeader;
    private View mFooter;
    private String[] mStrings = {"小明", "小红", "小黄", "小张"};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mListView = (ListView) findViewById(R.id.list_view);
        mHeader = View.inflate(this, R.layout.item_head, null);
        mFooter = View.inflate(this, R.layout.item_footer, null);
        //添加头
        mListView.addHeaderView(mHeader);
        //添加尾
        mListView.addFooterView(mFooter);
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, mStrings);
        mListView.setAdapter(adapter);
        mListView.setOnItemClickListener(this);
    }

    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        Toast.makeText(this, "position:"+position, Toast.LENGTH_SHORT).show();
    }
}