Android 之 下拉框(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

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<? 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

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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：

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<? 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

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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： 

 

 

文章出处：http://imshare.iteye.com/blog/770950