android:Spinner下拉框

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下面是两种方式将数据加载到下拉框列表中：

这里写图片描述

MainActivity .java

public class MainActivity extends Activity {    Spinner  spinner1;    Spinner  spinner2;    EditText edittext;    private ArrayAdapter<String> mAdapter;    private String[] mCounties={"北京","上海","深圳","广州"};    private List<String> Counties=new ArrayList<String>();    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        spinner1=(Spinner)findViewById(R.id.spinner1);        spinner2=(Spinner)findViewById(R.id.spinner2);        edittext=(EditText) findViewById(R.id.edittext);        for(int i=0;i<mCounties.length;i++){            Counties.add(mCounties[i]);        }        mAdapter=new ArrayAdapter<String>(MainActivity.this,android.R.layout.simple_spinner_item,Counties);        mAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);        spinner1.setAdapter(mAdapter);        ArrayAdapter<CharSequence> adapter=ArrayAdapter.createFromResource(MainActivity.this,R.array.counties,android.R.layout.simple_spinner_item);        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);        spinner2.setAdapter(adapter);    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;    }    public void Goto(View v){            setTitle("从"+spinner1.getSelectedItem()+" 到  "+spinner2.getSelectedItem()+"去");    }}

main.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:orientation="vertical" >    <TextView         android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="@string/text1"        />    <Spinner         android:id="@+id/spinner1"        android:layout_width="200dp"        android:layout_height="wrap_content"        android:drawSelectorOnTop="false"        />      <EditText         android:id="@+id/edittext"        android:layout_width="200dp"        android:layout_height="wrap_content"        android:visibility="gone"        android:hint="@string/text1"         />    <TextView        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="@string/text2"        />     <Spinner         android:id="@+id/spinner2"        android:layout_width="200dp"        android:layout_height="wrap_content"        android:drawSelectorOnTop="false"        />     <Button         android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="@string/text5"        android:onClick="Goto"         /></LinearLayout>

array.xml

<?xml version="1.0" encoding="utf-8"?><resources>    <string-array name="counties">        <item>北京</item>        <item>上海</item>        <item>深圳</item>        <item>广州</item>    </string-array></resources>

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