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문자


Spinner

版本:Android 2.2 r1

public final classSpinnerextendsAbsSpinner

java.lang.Object

android.view.View

android.view.ViewGroup

android.widget.AdapterView

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  ( 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 BooleanperformClick()

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 voidsetPromptId(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 adapter = new ArrayAdapter(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);

intbaseline= 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

xmlversion="1.0"encoding="utf-8"?>

<resources>

<stringname="hello">Hello World, SpinnerActivity!string>

<stringname="app_name">Spinner测试string>

<string-arrayname="spinnercolor">

<item>红色item>

<item>绿色item>

<item>白色item>

<item>橙色item>

string-array>

<stringname="planet_prompt">Please Choose a Itemstring>

resources>


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