Adapter:适配器-->将数据以什么形式发送到界面.

ΞBaseAdapter自定义及ListView的应用;

1.自定义BaseAdapter,重写其getView()方法;

ΞWife.java

public class Wife {    private String aName;    private String aSpeak;    private int aIcon;    public Wife() {    }    public Wife(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;    }}

 

Ξ重写BaseAdapter;

public class WifeAdapter extends BaseAdapter {    private LinkedList
     
       mData; //ArrayList和LinkedList都是实现了List接口的容器类,进行查操作时用ArrayList，进行增删操作的时候最好用LinkedList。    private Context mContext;    public WifeAdapter(LinkedList
      
        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) { 　　//重写geiView()    ViewHolder holder = null;    if(convertView == null){　　　　　　　　　　　　　　//由于会多次调用getView(),所以在此处判断,只需调用一次生成函数体(包括inflate()和findViewById())即可        convertView = LayoutInflater.from(mContext).inflate(R.layout.list_item_wife,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);   //将Holder存储到convertView中,setTag（Onbect）表示给View添加一个格外的数据，以后可以用getTag()将这个数据取出来。    }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; } }
      
     

 

ΞViewHolder是你自己造出来的一个类,配合convertView减少调用findViewById()的次数;

 

2.编写ListView;

mainActivity.java

public class MainActivity extends AppCompatActivity {    private List
     
       mData = null;    private Context mContext;    private WifeAdapter mAdapter = null;    private ListView list_wife;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mContext = MainActivity.this;        list_wife = (ListView) findViewById(R.id.list_wife);        mData = new LinkedList
      
       (); 　　　　//添加元素        mData.add(new Wife("椎名真白", "呐,你想变成什么颜色?", R.drawable.hina));        mData.add(new Wife("泽村英梨梨", "都说了我没生气!", R.drawable.ilili));        mData.add(new Wife("加藤惠", "老公~", R.drawable.megumi));        mAdapter = new WifeAdapter((LinkedList
       
        ) mData, mContext);        list_wife.setAdapter(mAdapter);    }}
       
      
     

list_item_wife.xml

activity_main.xml

 

3.效果图;