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Android 之 下拉框(Spinner)的使用

 
阅读更多
http://imshare.iteye.com/blog/770950
http://www.eoeandroid.com/forum.php?mod=viewthread&tid=172611

=========================================================
设置某个选项被选择

spinner.setSelection(spinnerSelectionId);
=========================================================

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:

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