android组件 --spinner

Spinner的使用
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代码 

<?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 
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;       @Override      protected void onCreate(Bundle savedInstanceState) {           // TODO Auto-generated method stub           super.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代码 

<?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 
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;         @Override      protected void onCreate(Bundle savedInstanceState) {           // TODO Auto-generated method stub           super.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： 






获取资源文件数组方法

String [] arryplantes = getResources().getStringArray(R.array.plantes);