Android下拉選單(spinner)應用(一) - 最基礎形式

Android的下拉選單名叫：spinner

spinner並不是直接讀取資料，而是經由一個適配器(Adapter)做為資料的橋接

適配器(Adapter)我們在另外的章節再做介紹，今天先拿最簡單的ArrayAdapter做示範

廢話不多說，下面就開始為您實作：

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/blood_group"
        android:textAppearance="?android:attr/textAppearanceMedium" />


    <Spinner
        android:id="@+id/spinner1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />


</LinearLayout>

string.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="hello">Hello World, ReadtxtActivity!</string>
    <string name="app_name">Readtxt</string>
    <string name="blood_group">血型</string>
</resources>

ReadtxtActivity

package jim.readtxt;

import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.Spinner;

public class ReadtxtActivity extends Activity {
  private Spinner spinner;  
  private ArrayAdapter<String> adapter;  
  private static final String[] Blood_group={"A型","B型","O型","AB型","其他"}; 
  
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        
        try{   
            spinner = (Spinner) findViewById(R.id.spinner1); 
            
            //將可選内容與ArrayAdapter連接起來  
            adapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,Blood_group);  
              
            //設置下拉列表的風格  
            adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);  
              
          //将adapter 添加到spinner中  
            spinner.setAdapter(adapter);  
                      
            
        }catch(Exception e){
            e.printStackTrace();
        }
    }                 
}

執行後畫面

後記：

此為最基礎的spinner下拉式選單應用，下個章節為您介紹spinner的其他應用。