本文实例讲述了Android中Spinner控件之键值对用法。分享给大家供大家参考。具体如下：
一、字典表，用来存放键值对信息
package com.ljq.activity;
import java.io.Serializable;
@SuppressWarnings("serial")
public class Dict implements Serializable {
private Integer id;
private String text;
public Dict() {
}
public Dict(Integer id, String text) {
super();
this.id = id;
this.text = text;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getText() {
return text;
}
public void setText(String text) {
this.text = text;
}
/**
* 为什么要重写toString()呢？
*
* 因为适配器在显示数据的时候，如果传入适配器的对象不是字符串的情况下，直接就使用对象.toString()
*/
@Override
public String toString() {
return text;
}
}
二、activity类，绑定数据、获取选中的键值对
package com.ljq.activity;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.Toast;
import android.widget.AdapterView.OnItemSelectedListener;
public class MainActivity extends Activity {
private Spinner mySpinner;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mySpinner = (Spinner) findViewById(R.id.mySpinner);
List<Dict> dicts = new ArrayList<Dict>();
dicts.add(new Dict(1, "测试1"));
dicts.add(new Dict(2, "测试2"));
dicts.add(new Dict(3, "测试3"));
dicts.add(new Dict(4, "测试4"));
ArrayAdapter<Dict> adapter = new ArrayAdapter<Dict>(this,
android.R.layout.simple_spinner_item, dicts);
mySpinner.setAdapter(adapter);
mySpinner.setOnItemSelectedListener(new OnItemSelectedListener(){
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
// 获取键的方法：mySpinner.getSelectedItem().toString()或((Dict)mySpinner.getSelectedItem()).getId()
// 获取值的方法：((Dict)mySpinner.getSelectedItem()).getText();
Toast.makeText(MainActivity.this,
"键:" + mySpinner.getSelectedItem().toString() + "、" + ((Dict) mySpinner.getSelectedItem()).getId() +
"，值:" + ((Dict) mySpinner.getSelectedItem()).getText(),
Toast.LENGTH_LONG).show();
}
public void onNothingSelected(AdapterView<?> parent) {
}
});
}
}
三、修改main.xml布局文件
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <Spinner android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/mySpinner"/> </LinearLayout>
四、运行结果如下：
希望本文所述对大家的Android程序设计有所帮助。