Spinner的简单学习

代码分析：

package com.mecury.spinnertest;

import java.util.ArrayList;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;

public class MainActivity extends ActionBarActivity {

    private Spinner spinnerButton;
    private Spinner spinner;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        spinnerButton = (Spinner) findViewById(R.id.spinnerButton);
        spinner = (Spinner) findViewById(R.id.spinner2);
        
        /*静态的显示下来出来的菜单选项，显示的数组元素提前已经设置好了
         * 第二个参数：已经编写好的数组
         * 第三个数据：默认的样式
         */
        ArrayAdapter<CharSequence> adapter = 
        ArrayAdapter.createFromResource(this, R.array.number_array, android.R.layout.simple_spinner_item);
        //设置spinner中每个条目的样式，同样是引用android提供的布局文件
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinnerButton.setAdapter(adapter);
        spinnerButton.setPrompt("测试");
        spinnerButton.setOnItemSelectedListener(new spinnerListener());
        
        /*
         * 动态添显示下来菜单的选项，可以动态添加元素
         */
        ArrayList<String> list = new ArrayList<String>();
        list.add("1.苹果");
        list.add("2.橘子");
        /*
         * 第二个参数是显示的布局
         * 第三个参数是在布局显示的位置id
         * 第四个参数是将要显示的数据
         */
        ArrayAdapter adapter2 = new ArrayAdapter(this, R.layout.item, R.id.textview,list);
        spinner.setAdapter(adapter2);
        spinner.setOnItemSelectedListener(new spinner2Listener());
    }

    class spinnerListener implements android.widget.AdapterView.OnItemSelectedListener{


        @Override
        public void onItemSelected(AdapterView<?> parent, View view,
                int position, long id) {
            //将选择的元素显示出来
            String selected = parent.getItemAtPosition(position).toString();
        }

        @Override
        public void onNothingSelected(AdapterView<?> parent) {
            System.out.println("nothingSelect");
        }
    }
    class spinner2Listener implements android.widget.AdapterView.OnItemSelectedListener{


        @Override
        public void onItemSelected(AdapterView<?> parent, View view,
                int position, long id) {
            String selected = parent.getItemAtPosition(position).toString();
        }

        @Override
        public void onNothingSelected(AdapterView<?> parent) {
            System.out.println("nothingSelect");
        }
    }
}

xml：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="10dp"
    tools:context="com.mecury.spinnertest.MainActivity" >

    <TextView 
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="这是静态的："/>
    <Spinner 
        android:id="@+id/spinnerButton"
        android:layout_width="match_parent"
        android:layout_height="30dp"/>
    <TextView 
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="这是动态的："/>
    <Spinner 
        android:id="@+id/spinner2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

</LinearLayout>

 

静态String。xml

<string-array name="number_array">
        <item>1000</item>
        <item>2000</item>
        <item>3000</item>
        <item>4000</item>
        <item>5000</item>
        <item>6000</item>
        <item>7000</item>
        <item>8000</item>
        <item>9000</item>
    </string-array>

动态item.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#00ffff"
    android:padding="10dp"
    android:orientation="vertical" >
    
    <TextView 
        android:id="@+id/textview"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="20dp"/>
</LinearLayout>