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テキスト


Spinner

版本:Android 2.2 r1

 

public final class Spinner extends AbsSpinner

 

java.lang.Object

android.view.View

        android.view.ViewGroup

                android.widget.AdapterView<T extends android.widget.Adapter>

                        android.widget.AbsSpinner

                                android.widget.Spinner

 

类概述

        

下拉列表(Spinner)是一个每次只能选择所有项中一项的部件。它的项来自于与之相关联的适配器中。

 

XML属性

属性名称

描述

android:prompt

该提示在下拉列表对话框显示时显示。(译者注:对话框的标题:

 

公共方法

public int getBaseline()

返回这个控件文本基线的偏移量。如果这个控件不支持基线对齐,那么方法返回-1.

返回值

返回控件基线左边边界位置,不支持时返回-1

                   (译者注:这个类不知道干什么用,只找到下面的代码

     public class AndroidBamboo extends Activity 
{
    public void onCreate( Bundle savedInstanceState ) 
    {
     super.onCreate ( savedInstanceState );
        Spinner spinner = new Spinner ( this );
        spinner.setPrompt( "500" );
        String [ ] items = { "bam", "boo", "lab", "code", "programming", "framework", "android" };
        ArrayAdapter array_adapter = new ArrayAdapter <String> ( this, android.R.layout.simple_spinner_item, items );
        array_adapter.setDropDownViewResource ( android.R.layout.simple_spinner_dropdown_item );
        spinner.setAdapter ( array_adapter );
        int baseline = spinner.getBaseline ( );
        setContentView ( spinner );
    }

}

 

public CharSequence getPrompt()

         返回值    

当对话框弹出的时候显示的提示(译者注:获得弹出视图上的标题字)

 

public void onClick(DialogInterface dialog, int which)

当点击弹出框中的项时这个方法将被调用。

参数

dialog       点击弹出的对话框

which      点击按钮(如:Button)或者点击位置

 

public Boolean performClick()

如果它被定义就调用此视图的OnClickListener(译者注:例如可以在加载时默认弹出下拉列表)。

         返回值

True一个指定的OnClickListener被调用,为false时不被调用。

 

public void setOnItemClickListener(AdapterView.OnItemClickListener  I)

        Spinner不支持item的点击事件,调用此方法将引发异常。

参数

l        这个监听将被忽略

 

public void setPromptId(CharSequence prompt)

设置对话框弹出的时候显示的提示(译者注:设置弹出视图上的标题字)

参数

prompt     设置的提示

 

public void setPromptId(int promptId)

设置对话框弹出的时候显示的提示(译者注:设置弹出视图上的标题字)

参数

prompted 当对话框显示是显示这个资源id所代表的提示。

 

受保护的方法

protected void onDetachedFromWindow ()

当这个视图从屏幕上卸载时候被调用。在这一点上不再绘制视图。

 

protected void onLayout (boolean changed, int l, int t, int r, int b)

View要为所有子对象分配大小和位置时,调用此方法。派生类与子项们应该重载这个方法和调用布局每一个子项。

         参数

changed   这是这个视图的一个新的大小或位置

l        相对父空间的左位置

t        相对父空间的顶端位置

r        相对父空间的右端位置

b       相对父空间的底部位置

参见

Creates and positions all views

 

补充

         文章链接

                   Android学习指南——Spinner 下拉列表

                   android自定义Spinner下拉菜单(下拉列表框)样式

         示例代码

                   Java代码

public class SpinnerActivity extends Activity {

   

    String mes = "Wolf";

    private static final String[] m_arr = {"第一组","第二组","第三组"};

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

       Spinner s1 = (Spinner)findViewById(R.id.Spinner01);

       s1.setPrompt("请选择颜色" );

       //ArrayAdapter adapter = ArrayAdapter.createFromResource(this, R.array.spinnercolor,android.R.layout.simple_spinner_item);

       ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, m_arr);

       adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);  

       s1.setAdapter(adapter); 

           s1.setSelection(1,true);

       //s1.setPromptId(CONTEXT_INCLUDE_CODE);

     

      

       int baseline = s1.getBaseline();

       s1.performClick();

       s1.setOnItemSelectedListener(new Spinner.OnItemSelectedListener(){

           public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3){

               dispToast("选择的是"+m_arr[arg2]);

               arg0.setVisibility(View.VISIBLE);

           }

           public void onNothingSelected(AdapterView<?> arg0){

               //

           }

       });

         Toast.makeText(this, s1.getPrompt() ,Toast.LENGTH_LONG).show();

    }

    public void dispToast(String str){

        Toast.makeText(this, str, Toast.LENGTH_SHORT).show();

    }  

}

XML文件

<?xml version="1.0" encoding="utf-8"?>

<resources>

    <string name="hello">Hello World, SpinnerActivity!</string>

    <string name="app_name">Spinner测试</string>

<string-array name="spinnercolor">

<item>红色</item>

<item>绿色</item>

<item>白色</item>

<item>橙色</item>

</string-array>

<string name="planet_prompt">Please Choose a Item</string>

</resources>


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