Android ListView的使用（三）

前两节关于ListView的，已经使用了ArrayAdapter，SimpleAdapter了，两个比较基本的适配器

这里来用一个用的最多的一个适配器BaseAdapter。

还是先上效果图。大概和微博首页差不多的

上代码：创建主页面 activity_main.xml

<?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=".MainActivity">

    <ListView
        android:id="@+id/list_item"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</android.support.constraint.ConstraintLayout>

创建 ListView 要显示的内容页面：listview_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="horizontal">

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="64dp"
        android:layout_height="64dp"
        app:srcCompat="@android:color/holo_blue_light" />

    <!-- 定义一个竖直方向的LinearLayout,把QQ呢称与说说的文本框设置出来 -->

    <LinearLayout
        android:id="@+id/new_line"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

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

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

        <TextView
            android:id="@+id/times"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="TextView"
            android:textSize="14sp"/>

        <ImageView
            android:id="@+id/image"
            android:layout_width="223dp"
            android:layout_height="170dp"
            app:srcCompat="@drawable/ic_launcher_background" />

    </LinearLayout>

</LinearLayout>

创建一个dto类：

package action.sun.com.listview3;

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

    private  String time;
    private  int Image;

    public Animal(String aName, String aSpeak, int aIcon,String atime,int aImage) {
        this.aName = aName;
        this.aSpeak = aSpeak;
        this.aIcon = aIcon;
        this.time = atime;
        this.Image = aImage;

    }

    public String getaName() {
        return aName;
    }

    public String getaSpeak() {
        return aSpeak;
    }

    public int getaIcon() {
        return aIcon;
    }

    public String getTime() {
        return time;
    }

    public int getaImage() {
        return Image;
    }

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

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

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

    public void setTime(String time) {
        this.time = time;
    }

    public void setImage(int Image) {
        this.Image = Image;
    }
}

创建一个适配器：

package action.sun.com.listview3;

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;
    }

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

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

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

    // 视图
    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {
        view = LayoutInflater.from(mContext).inflate(R.layout.listview_item,viewGroup,false);

        ImageView img_icon = (ImageView) view.findViewById(R.id.imageView);
        TextView txt_aName = (TextView) view.findViewById(R.id.name);
        TextView txt_aSpeak = (TextView) view.findViewById(R.id.says);
        TextView txt_times = (TextView) view.findViewById(R.id.times);
        ImageView txt_image = (ImageView) view.findViewById(R.id.image);

        img_icon.setBackgroundResource(mData.get(i).getaIcon());
        txt_aName.setText(mData.get(i).getaName());
        txt_aSpeak.setText(mData.get(i).getaSpeak());
        txt_times.setText(mData.get(i).getTime());
        txt_image.setBackgroundResource(mData.get(i).getaImage());
        return view;
    }
}

主类MainActivity:

package action.sun.com.listview3;

import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ListView;

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

public class MainActivity extends AppCompatActivity {

    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_item);

        mData = new LinkedList<Animal>();
        mData.add(new Animal("Tom", "22222", R.mipmap.ic_launcher,"1天前",R.drawable.ic_launcher_background));
        mData.add(new Animal("Jack", "33333333", R.mipmap.ic_launcher,"2天前",R.drawable.ic_launcher_background));
        mData.add(new Animal("Json", "4444444", R.mipmap.ic_launcher,"3天前",R.drawable.ic_launcher_background));
        mData.add(new Animal("Kumi", "1121313", R.mipmap.ic_launcher,"4天前",R.drawable.ic_launcher_background));
        mData.add(new Animal("Timi", "88888", R.mipmap.ic_launcher,"5天前",R.drawable.ic_launcher_background));
        mAdapter = new AnimalAdapter((LinkedList<Animal>) mData, mContext);
        list_animal.setAdapter(mAdapter);
    }
}

代码完毕，运行即可。