ListView简单实用－自定义BaseAdapter，然后绑定ListView的最简单例子

本节我们来继续学习没有讲完的UI控件部分，回顾上一节，我们介绍了Adapter适配器的概念，然后学习了三个最简单的适配器的使用：
ArrayAdapter，SimpleAdapter和SimpleCursorAdapter，而本节给大家讲解的是第一个需搭配Adapter使用的UI控件：ListView，不过在版本中被RecyclerView这个新控件替换掉了！
列表作为最常用的控件之一，还是有必要好好学习的，本节以一个初学者的角度来学习ListView，ListView的属性，以及BaseAdapter简单定义，至于ListView优化这些，我们一步步来~莫急！

---

1.自定义BaseAdapter，然后绑定ListView的最简单例子

先看看我们要实现的效果图：

一个很简单的ListView，自己写下Item，然后加载点数据这样~下面贴下关键代码：

Animal.java:

/**
 * Created by Jay on 2015/9/18 0018.
 */
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.java：自定义的BaseAdapter：

/**
 * Created by Jay on 2015/9/18 0018.
 */
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) {
        convertView = LayoutInflater.from(mContext).inflate(R.layout.item_list_animal,parent,false);
        ImageView img_icon = (ImageView) convertView.findViewById(R.id.img_icon);
        TextView txt_aName = (TextView) convertView.findViewById(R.id.txt_aName);
        TextView txt_aSpeak = (TextView) convertView.findViewById(R.id.txt_aSpeak);
        img_icon.setBackgroundResource(mData.get(position).getaIcon());
        txt_aName.setText(mData.get(position).getaName());
        txt_aSpeak.setText(mData.get(position).getaSpeak());
        return convertView;
    }
}

最后是MainActivity.java：

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_animal);
        mData = new LinkedList<Animal>();
        mData.add(new Animal("狗说", "你是狗么?", R.mipmap.ic_icon_dog));
        mData.add(new Animal("牛说", "你是牛么?", R.mipmap.ic_icon_cow));
        mData.add(new Animal("鸭说", "你是鸭么?", R.mipmap.ic_icon_duck));
        mData.add(new Animal("鱼说", "你是鱼么?", R.mipmap.ic_icon_fish));
        mData.add(new Animal("马说", "你是马么?", R.mipmap.ic_icon_horse));
        mAdapter = new AnimalAdapter((LinkedList<Animal>) mData, mContext);
        list_animal.setAdapter(mAdapter);
    }

}