下拉列表 Spinner

下拉列表 Spinner。 

Spinner的使用，可以极大提高用户的体验性。当需要用户选择的时候，可以提供一个下拉列表将所有可选的项列出来。供用户选择。 

Demo如下，可以留作参考 

一、使用数组作为数据源 

1.新建一个android的工程 
2.工程的layout.xml文件如下：声明一个TextView控件和一个Spinner控件

<?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="fill_parent"  android:orientation="vertical"  >  <TextView android:id="@+id/spinnerText"  android:layout_width="fill_parent"   android:layout_height="wrap_content"></TextView>  <Spinner android:id="@+id/Spinner01"            android:layout_width="fill_parent"           android:layout_height="wrap_content"></Spinner></LinearLayout>

3.java代码

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.TextView;public class SpinnerActivity extends Activity {private static final String[] m={"A型","B型","O型","AB型","其他"};private TextView view ;private Spinner spinner;private ArrayAdapter<String> adapter;@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setContentView(R.layout.spinner);view = (TextView) findViewById(R.id.spinnerText);spinner = (Spinner) findViewById(R.id.Spinner01);//将可选内容与ArrayAdapter连接起来adapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,m);//设置下拉列表的风格adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);//将adapter 添加到spinner中spinner.setAdapter(adapter);//添加事件Spinner事件监听  spinner.setOnItemSelectedListener(new SpinnerSelectedListener());//设置默认值spinner.setVisibility(View.VISIBLE);}//使用数组形式操作class SpinnerSelectedListener implements OnItemSelectedListener{public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,long arg3) {view.setText("你的血型是："+m[arg2]);}public void onNothingSelected(AdapterView<?> arg0) {}}}

4、运行效果如下： 

 

  

二、使用XML作为数据源 
1.新建一个android的工程 
2.在values文件夹下新建一个arryas.xml文件：声明一个TextView控件和一个Spinner控件，代码如下：

<?xml version="1.0" encoding="utf-8"?><resources><string-array name="plantes"><item>NOKIA</item><item>MOTO</item><item>HTC</item><item>LG</item><item>其他</item></string-array></resources>

3.java代码

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.TextView;public class SpinnerActivity extends Activity {private TextView view2;private Spinner spinner2;private ArrayAdapter adapter2;@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setContentView(R.layout.spinner);spinner2 = (Spinner) findViewById(R.id.spinner02);view2 = (TextView) findViewById(R.id.spinnerText02);//将可选内容与ArrayAdapter连接起来adapter2 = ArrayAdapter.createFromResource(this, R.array.plantes, android.R.layout.simple_spinner_item);//设置下拉列表的风格 adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);//将adapter2 添加到spinner中spinner2.setAdapter(adapter2);//添加事件Spinner事件监听  spinner2.setOnItemSelectedListener(new SpinnerXMLSelectedListener());//设置默认值spinner2.setVisibility(View.VISIBLE);}//使用XML形式操作class SpinnerXMLSelectedListener implements OnItemSelectedListener{public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,long arg3) {view2.setText("你使用什么样的手机："+adapter2.getItem(arg2));}public void onNothingSelected(AdapterView<?> arg0) {}}}

4、运行效果如下： 

 

 

感谢：http://imshare.iteye.com/blog/770950