本文实例讲述了Android编程开发之Spinner组件用法。分享给大家供大家参考，具体如下：
Spinner组件组要用显示一个下拉列表，在使用中需要用到适配器Adapter，下面是一个该组件的使用示例
首先是布局文件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"> <Spinner android:id="@+id/spinner1" android:layout_width="fill_parent" android:layout_height="wrap_content" /> <Spinner android:id="@+id/spinner2" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginTop="20dp"/> </LinearLayout>
由于用到simpAdapter所以要写子项Item的布局如下 item.xml：
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="wrap_content"> <ImageView android:id="@+id/ivLogo" android:layout_width="60dp" android:layout_height="60dp" android:src="@drawable/icon" android:paddingLeft="10dp" /> <TextView android:id="@+id/tvApplicationName" android:textColor="#000" android:layout_width="wrap_content" android:layout_height="fill_parent" android:textSize="16dp" android:gravity="center_vertical" android:paddingLeft="10dp" /> </LinearLayout>
下面是代码：
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import android.app.Activity;
import android.app.AlertDialog;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.SimpleAdapter;
import android.widget.Spinner;
import android.widget.AdapterView.OnItemSelectedListener;
public class Main extends Activity
{
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//获取对象
Spinner spinner1 = (Spinner) findViewById(R.id.spinner1);
String[] applicationNames = new String[]
{ "多功能日历", "eoeMarket客户端", "耐玩的重力消砖块", "白社会", "程序终结者" };
ArrayAdapter<String> aaAdapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, applicationNames);
// 将如下代码可以使列表项带RadioButton组件
// aaAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner1.setAdapter(aaAdapter);
Spinner spinner2 = (Spinner) findViewById(R.id.spinner2);
final List<Map<String, Object>> items = new ArrayList<Map<String, Object>>();
Map<String, Object> item1 = new HashMap<String, Object>();
item1.put("ivLogo", R.drawable.calendar);
item1.put("tvApplicationName", "多功能日历");
Map<String, Object> item2 = new HashMap<String, Object>();
item2.put("ivLogo", R.drawable.eoemarket);
item2.put("tvApplicationName", "eoeMarket客户端");
items.add(item1);
items.add(item2);
SimpleAdapter simpleAdapter = new SimpleAdapter(this, items,
R.layout.item, new String[]
{ "ivLogo", "tvApplicationName" }, new int[]
{ R.id.ivLogo, R.id.tvApplicationName });
spinner2.setAdapter(simpleAdapter);
//为Spinner2加上监听事件
spinner2.setOnItemSelectedListener(new OnItemSelectedListener()
{
@Override
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id)
{
new AlertDialog.Builder(view.getContext()).setTitle(
items.get(position).get("tvApplicationName")
.toString()).setIcon(
Integer.parseInt(items.get(position).get("ivLogo")
.toString())).show();
}
@Override
public void onNothingSelected(AdapterView<?> parent)
{
}
});
}
}
希望本文所述对大家Android程序设计有所帮助。
