Android 控件之七：Spinner 下拉列表

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.Toast;

public class MainHelloSpinner extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// 找到Xml中定义的下拉列表
Spinner spinner = (Spinner) findViewById(R.id.spinner);
// 准备一个数组适配器
ArrayAdapter adapter = ArrayAdapter.createFromResource(this,
R.array.colors,

android.R.layout.simple_spinner_item);
// 设置下拉样式
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// 为下拉列表设置适配器
spinner.setAdapter(adapter);
// 定义子元素选择监听器
OnItemSelectedListener oisl = new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
Toast.makeText(
MainHelloSpinner.this,
"选择的色彩： "
+ parent.getItemAtPosition(position).toString(),
Toast.LENGTH_LONG).show();
}

@Override
public void onNothingSelected(AdapterView<?> parent) {
}
};
// 为下拉列表绑定事件监听器
spinner.setOnItemSelectedListener(oisl);
}
}

<?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="wrap_content"
    android:orientation="vertical"
    android:padding="10dip" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dip"
        android:text="@string/color" />

    <Spinner
        android:id="@+id/spinner"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:prompt="@string/color" />

</LinearLayout>

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

<string name="app_name">MainHelloSpinner</string>
<string name="color">选择色彩：</string>

<string-array name="colors">
<item>黑色 | Black</item>
<item>蓝色 | Blue</item>
<item>棕色 | Brown</item>
<item>绿色 | Green</item>
<item>灰色 | Grey</item>
<item>粉色 | Pink</item>
<item>紫色 | Purple</item>
<item>红色 | Red</item>
<item>白色 | White</item>
<item>黄色 | Yellow</item>
</string-array>

</resources>