Android应用开发UI（下拉列表）

在Android平台上使用下拉列表用到了Spinner组件，效果图如下：

?

代码：

1,res/values/string.xml

<?xml version="1.0" encoding="utf-8"?><resources>    <string name="title_tx">团购人群调查：你所处在年龄段：</string>    <string name="app_name">下拉列表(Spinner)</string>    <string name="about_80080088">更多详情，可登录http://www.80080088.com了解。</string></resources>

?

2,res/layout/main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    ><TextView      android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:text="@string/title_tx"    android:id="@+id/title_tx"/><TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/about_80080088"android:id="@+id/about_80080088"></TextView><Spinner android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/spinnerAge"></Spinner></LinearLayout>

?

3.Activity类

package com.cottsoft.android;import android.app.Activity;import android.graphics.Color;import android.os.Bundle;import android.view.View;import android.widget.AdapterView;import android.widget.ArrayAdapter;import android.widget.Spinner;import android.widget.TextView;public class A008Activity extends Activity {private static final String[] m_Ages = {"0到18岁","19至30岁","31到60岁","61岁到80岁","81岁以上"};private TextView m_title_tx,m_about_80080088;private Spinner m_Spinner;private ArrayAdapter<String> adapter;    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                m_title_tx = (TextView) findViewById(R.id.title_tx);        m_about_80080088=(TextView) findViewById(R.id.about_80080088);        m_Spinner = (Spinner) findViewById(R.id.spinnerAge);                m_title_tx.setTextSize(22);        m_about_80080088.setTextSize(15);        m_about_80080088.setTextColor(Color.GRAY);                adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item,m_Ages);        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);                m_Spinner.setAdapter(adapter);                m_Spinner.setOnItemSelectedListener(new Spinner.OnItemSelectedListener(){@Overridepublic void onItemSelected(AdapterView<?> arg0, View arg1,int arg2, long arg3) {m_title_tx.setText(getResources().getString(R.string.title_tx)+m_Ages[arg2]);arg0.setVisibility(View.VISIBLE);}@Overridepublic void onNothingSelected(AdapterView<?> arg0) {}                });    }}

?