通過XML定義數組適配器(ArrayAdapter), 使用ArrayAdapter.createFromResource().

在上一個例子(下拉列表(Spinner))中, 我們使用編程代碼定義數組的內容. 其實數組適配器(ArrayAdapter)的內容亦可以使用ArrayAdapter.createFromResource(), 通過XML定義.

創建一個新的XML文件, res/values/arrays.xml

<?xml version="1.0" encoding="UTF-8"?>
<resources>
    <string-array name="dayOfWeek">
        <item>Sunday</item>
        <item>Monday</item>
        <item>Tuesday</item>
        <item>Wednesday</item>
        <item>Thursday</item>
        <item>Friday</item>
        <item>Saturday</item>
    </string-array>
</resources>

修改主程序:

package com.AndroidSpinner;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;
import android.widget.Toast;

public class AndroidSpinner extends Activity {
 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        final Spinner mySpinner = (Spinner)findViewById(R.id.spinner);
        Button myButton = (Button)findViewById(R.id.button);
        
        ArrayAdapter<CharSequence> adapter = 
         ArrayAdapter.createFromResource(this, R.array.dayOfWeek, 
           android.R.layout.simple_spinner_item);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        mySpinner.setAdapter(adapter);
        
        myButton.setOnClickListener(
          new Button.OnClickListener(){

     @Override
     public void onClick(View v) {
      // TODO Auto-generated method stub
      Toast
      .makeText(AndroidSpinner.this, 
      (CharSequence) mySpinner.getSelectedItem(), 
        Toast.LENGTH_LONG)
      .show();
     } 
          });
    }
}

main.xml跟原先的一樣; 可參考下拉列表(Spinner).