MainActivity 类
package com.example.android_06; /** * 上课代码 */ import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.AutoCompleteTextView; import android.widget.MultiAutoCompleteTextView; import android.widget.SimpleAdapter; import android.widget.Spinner; import android.widget.Toast; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; public class MainActivity extends AppCompatActivity { // 简单控件 // 搜索下拉框图片加描述 private List<Map<String ,Object>> data3 = new ArrayList<>(); private SimpleAdapter adapter3; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); /** * 搜索下拉框图片加描述 */ // 初始化 loadData3(); adapter3 = new SimpleAdapter(this,data3,R.layout.spinner_main_item1,new String[] {"img","desc"},new int[] {R.id.iv_main_img,R.id.tv_main_desc}); spinner_main_img.setAdapter(adapter3); spinner_main_img.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { @Override public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { Map<String ,Object> itemAtPosition = (Map<String, Object>) parent.getItemAtPosition(position); Toast.makeText(MainActivity.this, itemAtPosition.toString(), Toast.LENGTH_SHORT).show(); } @Override public void onNothingSelected(AdapterView<?> parent) { } }); } /** * 搜索下拉框图片加描述 */ private void loadData3() { List<Book> list = new BookDAO().list(); Map<String,Object> map; for (Book book : list) { map = new HashMap<>(); map.put("img",book.getImage()); map.put("desc",book.getName()); data3.add(map); } } }book类
package com.example.android_06; public class Book { private Integer id; private String name; private Integer image; public Book() { } public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Integer getImage() { return image; } public void setImage(Integer image) { this.image = image; } }bookdao类
package com.example.android_06; import java.util.ArrayList; import java.util.List; public class BookDAO { public List<Book> list() { List<Book> bookList = new ArrayList<Book>(); String[] names = {"愤怒的小鸟", "汤姆猫", "落汤鸡", "牛牛", "哈巴狗", "神龙", "烤鸭", "小象", "美人鱼", "九尾狐"}; int[] images = {R.drawable.bird, R.drawable.cat, R.drawable.chicken, R.drawable.cow, R.drawable.dog, R.drawable.dragon, R.drawable.duck, R.drawable.elephant, R.drawable.fish, R.drawable.fox}; Book b = null; for (int i = 0; i < names.length; i++) { b = new Book(); b.setId(i + 1); b.setName(names[i]); b.setImage(images[i]); bookList.add(b); } return bookList; } }
