ListView簡單使用

先上效果：

主要實現了Listview的繫結和點選事件。專案資源結構如下：

先建立一個動物類，用來裝載資料：

Animal類如下：

package com.example.simplelistviewdemo;

public class Animal {
    private String aName;
    private String aSpeak;
    private int aIcon;

    public Animal() {
    }

    public Animal(String aName, String aSpeak, int aIcon) {
        this.aName = aName;
        this.aSpeak = aSpeak;
        this.aIcon = aIcon;
    }

    public String getaName() {
        return aName;
    }

    public String getaSpeak() {
        return aSpeak;
    }

    public int getaIcon() {
        return aIcon;
    }

    public void setaName(String aName) {
        this.aName = aName;
    }

    public void setaSpeak(String aSpeak) {
        this.aSpeak = aSpeak;
    }

    public void setaIcon(int aIcon) {
        this.aIcon = aIcon;
    }
}

AnimalAdapter類如下：

package com.example.simplelistviewdemo;

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

import java.util.LinkedList;

public class AnimalAdapter extends BaseAdapter {

    private LinkedList<Animal> mData;
    private Context mContext;

    public AnimalAdapter(LinkedList<Animal> mData, Context mContext) {
        this.mData = mData;
        this.mContext = mContext;
    }

    @Override
    public int getCount() {
        return mData.size();
    }

    @Override
    public Object getItem(int position) {
        return null;
    }

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder = null;
        if(convertView == null){
            convertView = LayoutInflater.from(mContext).inflate(R.layout.item_list_animal,parent,false);
            holder = new ViewHolder();
            holder.img_icon = (ImageView) convertView.findViewById(R.id.img_icon);
            holder.txt_aName = (TextView) convertView.findViewById(R.id.txt_aName);
            holder.txt_aSpeak = (TextView) convertView.findViewById(R.id.txt_aSpeak);
            convertView.setTag(holder);   //將Holder儲存到convertView中
        }else{
            holder = (ViewHolder) convertView.getTag();
        }
        holder.img_icon.setBackgroundResource(mData.get(position).getaIcon());
        holder.txt_aName.setText(mData.get(position).getaName());
        holder.txt_aSpeak.setText(mData.get(position).getaSpeak());
        return convertView;
    }

    static class ViewHolder{
        ImageView img_icon;
        TextView txt_aName;
        TextView txt_aSpeak;
    }
}

MainActivity程式碼如下：

package com.example.simplelistviewdemo;

import android.content.Context;
import android.net.Uri;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.AdapterView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.Toast;



import java.util.LinkedList;
import java.util.List;

public class MainActivity extends AppCompatActivity implements AdapterView.OnItemClickListener{

    private List<Animal> mData = null;
    private Context mContext;
    private AnimalAdapter mAdapter = null;
    private ListView list_animal;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mContext = MainActivity.this;
        list_animal = (ListView) findViewById(R.id.list_animal);

        //動態載入頂部View和底部View
        final LayoutInflater inflater = LayoutInflater.from(this);
        View headView = inflater.inflate(R.layout.view_header, null, false);
        View footView = inflater.inflate(R.layout.view_footer, null, false);

        mData = new LinkedList<Animal>();
        mData.add(new Animal("狗說", "你是狗麼?", R.mipmap.ic_icon_dog));
        mData.add(new Animal("牛說", "你是牛麼?", R.mipmap.ic_icon_cow));
        mData.add(new Animal("鴨說", "你是鴨麼?", R.mipmap.ic_icon_duck));
        mData.add(new Animal("魚說", "你是魚麼?", R.mipmap.ic_icon_fish));
        mData.add(new Animal("馬說", "你是馬麼?", R.mipmap.ic_icon_horse));
        mAdapter = new AnimalAdapter((LinkedList<Animal>) mData, mContext);

        //新增表頭和表尾需要寫在setAdapter方法呼叫之前！！！
        list_animal.addHeaderView(headView);
        list_animal.addFooterView(footView);

        list_animal.setAdapter(mAdapter);
        list_animal.setOnItemClickListener(this);
    }
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        Toast.makeText(mContext, "你點選了第" + position + "項", Toast.LENGTH_SHORT).show();
    }
}

主介面佈局如下：

activity_main.xml：

<?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="match_parent"
    android:orientation="vertical"
    tools:context="com.example.simplelistviewdemo.MainActivity">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="48dp"
        android:textSize="18sp"
        android:text="動物的世界你們不懂"
        android:gravity="center"
        />
    <ListView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/list_animal"
        android:layout_gravity="center_horizontal" />
</LinearLayout>

item_list_animal.xml：

<?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="horizontal">

    <!-- 定義一個用於顯示頭像的ImageView -->
    <ImageView
        android:id="@+id/img_icon"
        android:layout_width="64dp"
        android:layout_height="64dp"
        android:baselineAlignBottom="true"
        android:paddingLeft="8dp" />

    <!-- 定義一個豎直方向的LinearLayout,把QQ呢稱與說說的文字框設定出來 -->
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <TextView
            android:id="@+id/txt_aName"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:paddingLeft="8dp"
            android:textColor="#1D1D1C"
            android:textSize="20sp" />

        <TextView
            android:id="@+id/txt_aSpeak"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:paddingLeft="8px"
            android:textColor="#B4B4B9"
            android:textSize="14sp" />

    </LinearLayout>

</LinearLayout>

附加了一個頭部和一個底部：

view_header.xml：

<?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"
    android:gravity="center">
    <TextView
        android:layout_width="match_parent"
        android:layout_height="48dp"
        android:textSize="18sp"
        android:text="表頭"
        android:gravity="center"
        android:background="#43BBEB"
        android:textColor="#FFFFFF"/>
</LinearLayout>

view_footer.xml：

<?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"
    android:gravity="center">
    <TextView
        android:layout_width="match_parent"
        android:layout_height="48dp"
        android:textSize="18sp"
        android:text="表尾"
        android:gravity="center"
        android:background="#43BBEB"
        android:textColor="#FFFFFF"/>
</LinearLayout>

完整程式碼下載