初识Adapter

首先得了解Adapter层级关系：

示例，将user对象适配到textview

 public class User {

     private String userName;
     private String userAddress;

     public User(String name, String address) {
         // TODO Auto-generated constructor stub

         userAddress = address;
         userName = name;
     }

     public String getUserName() {
         return userName;
     }

     public void setUserName(String userName) {
         this.userName = userName;
     }

     public String getUserAddress() {
         return userAddress;
     }

     public void setUserAddress(String userAddress) {
         this.userAddress = userAddress;
     }

 }

为user对象定制UserAdapter，并实现BaseAdapter抽象方法

 public class UserAdapter extends BaseAdapter {

     List<User> mUsers;

     Context mContext;

     public UserAdapter(Context context, List<User> users) {

         mContext = context;
         mUsers = users;
     }

     @Override
     public int getCount() {
         // TODO Auto-generated method stub
         return mUsers.size();
     }

     @Override
     public Object getItem(int position) {
         // TODO Auto-generated method stub
         return mUsers.get(position);
     }

     @Override
     public long getItemId(int position) {
         // TODO Auto-generated method stub
         return position;
     }

     @Override
     public View getView(int position, View convertView, ViewGroup parent) {
         // TODO Auto-generated method stub

         convertView = LayoutInflater.from(mContext).inflate(R.layout.user_item, null);
         TextView textView1 = (TextView) convertView.findViewById(R.id.textView1);
         TextView textView2 = (TextView) convertView.findViewById(R.id.textView2);
         textView1.setText(mUsers.get(position).getUserName());
         textView2.setText(mUsers.get(position).getUserAddress());

         return convertView;
     }

 }

在主activity里调用适配器,注意，onClickListener对Spinner不适用，调用会报错

 protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_form);

         // showSpinner();
         showUserSpinner();
     }

     public void showUserSpinner() {
         Spinner spinner = (Spinner) findViewById(R.id.spinner3);
         ArrayList<User> users = new ArrayList<User>();
         users.add(new User("Jewelinsie", "重庆"));
         users.add(new User("Chung Shurecy", "内江"));

         UserAdapter userAdapter = new UserAdapter(this, users);
16         spinner.setAdapter(userAdapter);

         spinner.setOnItemSelectedListener(new OnItemSelectedListener() {

             @Override
             public void onItemSelected(AdapterView<?> parent, View view,
                     int position, long id) {
                 // TODO Auto-generated method stub
                 TextView textView2 = (TextView)view.findViewById(R.id.textView2);
                 Log.i(TAG, "address is "+textView2.getText().toString());
             }

             @Override
             public void onNothingSelected(AdapterView<?> parent) {
                 // TODO Auto-generated method stub

             }
         });

     }

Layout配置如下：

     <TextView
         android:id="@+id/textView1"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
           android:layout_margin="10dp"
           android:drawableLeft="@drawable/p16"
         />

     <TextView
         android:id="@+id/textView2"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
          android:layout_margin="10dp"
         />

实现效果，样式图片虽然丑了点，但是在功能上是成功的。