Android 之 下拉框(Spinner)的简单使用



1. 工程的layout.xml文件如下：声明一个TextView控件和一个Spinner控件

"1.0" encoding="utf-8"?>

  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:orientation="vertical"
  >
  "@+id/spinnerText"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content">
  "@+id/Spinner01"
           android:layout_width="fill_parent"
           android:layout_height="wrap_content">

 

 

 

2. 下拉选择项。这边使用xml，当然也可以使用其他的方式，比如ArrayAdapter、自定义Adapter等。

 

xml version="1.0" encoding="utf-8"?>
<resources>
    <string-array name="plantes">
        <item>中国item>
        <item>美国item>
        <item>日本item>
        <item>英国item>
        <item>法国item>
    string-array>
resources>

中国 美国 日本 英国 法国  

 

3. 主类

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;

public class SpinnerActivity extends Activity {

    private TextView view2;
    private Spinner spinner2;
    private ArrayAdapter adapter2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.spinner);

        spinner2 = (Spinner) findViewById(R.id.spinner02);
        view2 = (TextView) findViewById(R.id.spinnerText02);

        //将可选内容与ArrayAdapter连接起来
        adapter2 = ArrayAdapter.createFromResource(this, R.array.plantes, android.R.layout.simple_spinner_item);

        //设置下拉列表的风格
    adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

        //将adapter2 添加到spinner中
        spinner2.setAdapter(adapter2);

        //添加事件Spinner事件监听
        spinner2.setOnItemSelectedListener(new SpinnerXMLSelectedListener());

        //设置默认值
        spinner2.setVisibility(View.VISIBLE);

    }

    //使用XML形式操作
    class SpinnerXMLSelectedListener implements OnItemSelectedListener{
        public void onItemSelected(AdapterView arg0, View arg1, int arg2,
                long arg3) {
            view2.setText("你来自："+adapter2.getItem(arg2));
        }

        public void onNothingSelected(AdapterView arg0) {

        }

    }
}

import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.AdapterView; import android.widget.AdapterView.OnItemSelectedListener; import android.widget.ArrayAdapter; import android.widget.Spinner; import android.widget.TextView; public class SpinnerActivity extends Activity { private TextView view2; private Spinner spinner2; private ArrayAdapter adapter2; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.spinner); spinner2 = (Spinner) findViewById(R.id.spinner02); view2 = (TextView) findViewById(R.id.spinnerText02); //将可选内容与ArrayAdapter连接起来 adapter2 = ArrayAdapter.createFromResource(this, R.array.plantes, android.R.layout.simple_spinner_item); //设置下拉列表的风格 adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); //将adapter2 添加到spinner中 spinner2.setAdapter(adapter2); //添加事件Spinner事件监听 spinner2.setOnItemSelectedListener(new SpinnerXMLSelectedListener()); //设置默认值 spinner2.setVisibility(View.VISIBLE); } //使用XML形式操作 class SpinnerXMLSelectedListener implements OnItemSelectedListener{ public void onItemSelected(AdapterView arg0, View arg1, int arg2, long arg3) { view2.setText("你来自："+adapter2.getItem(arg2)); } public void onNothingSelected(AdapterView arg0) { } } }

 

setDropDownViewResource 主要是设置 User 点击 Spinner 后出现的下拉菜单样式， android 亦提供两种基本的样式：  
android.R.layout.simple_spinner_item ： TextView 的下拉菜单。  
android.R.layout.simple_spinner_dropdown_item ：除了有 TextView ，右边有 radio 的下拉菜单。