Android编程开发之Spinner组件用法
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：
<?xmlversion="1.0"encoding="utf-8"?> <LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical"android:layout_width="fill_parent" android:layout_height="fill_parent"> <Spinnerandroid:id="@+id/spinner1"android:layout_width="fill_parent" android:layout_height="wrap_content"/> <Spinnerandroid: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：
<?xmlversion="1.0"encoding="utf-8"?> <LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal"android:layout_width="fill_parent" android:layout_height="wrap_content"> <ImageViewandroid:id="@+id/ivLogo"android:layout_width="60dp" android:layout_height="60dp"android:src="@drawable/icon" android:paddingLeft="10dp"/> <TextViewandroid: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：
importjava.util.ArrayList;
importjava.util.HashMap;
importjava.util.List;
importjava.util.Map;
importandroid.app.Activity;
importandroid.app.AlertDialog;
importandroid.os.Bundle;
importandroid.view.View;
importandroid.widget.AdapterView;
importandroid.widget.ArrayAdapter;
importandroid.widget.SimpleAdapter;
importandroid.widget.Spinner;
importandroid.widget.AdapterView.OnItemSelectedListener;
publicclassMainextendsActivity
{
@Override
publicvoidonCreate(BundlesavedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//获取对象
Spinnerspinner1=(Spinner)findViewById(R.id.spinner1);
String[]applicationNames=newString[]
{"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=newArrayAdapter<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);
Spinnerspinner2=(Spinner)findViewById(R.id.spinner2);
finalList<Map<String,Object>>items=newArrayList<Map<String,Object>>();
Map<String,Object>item1=newHashMap<String,Object>();
item1.put("ivLogo",R.drawable.calendar);
item1.put("tvApplicationName","多功能日历");
Map<String,Object>item2=newHashMap<String,Object>();
item2.put("ivLogo",R.drawable.eoemarket);
item2.put("tvApplicationName","eoeMarket客户端");
items.add(item1);
items.add(item2);
SimpleAdaptersimpleAdapter=newSimpleAdapter(this,items,
R.layout.item,newString[]
{"ivLogo","tvApplicationName"},newint[]
{R.id.ivLogo,R.id.tvApplicationName});
spinner2.setAdapter(simpleAdapter);
//为Spinner2加上监听事件
spinner2.setOnItemSelectedListener(newOnItemSelectedListener()
{
@Override
publicvoidonItemSelected(AdapterView<?>parent,Viewview,
intposition,longid)
{
newAlertDialog.Builder(view.getContext()).setTitle(
items.get(position).get("tvApplicationName")
.toString()).setIcon(
Integer.parseInt(items.get(position).get("ivLogo")
.toString())).show();
}
@Override
publicvoidonNothingSelected(AdapterView<?>parent)
{
}
});
}
}
希望本文所述对大家Android程序设计有所帮助。