Android getting started tutorial (13th)-custom drop-down menu mode-Application of spinner and setdropdownviewresource)

Hello everyone, let's take a look at the drop-down menu spinner under android in this section, just like the swing ComboBox and HTML <SELECT>. Due to limited mobile phone images, to select a project within a limited range, the drop-down menu is a good choice.

 

The drop-down menu of the spinner widget provided by Android is very easy to use and the style is also applicable. however, the focus of the demo in this section is to customize the style in the drop-down menu. The key is to call the setdropdownviewresource method to define the display style of the drop-down menu in XML format.

 

Step 1:Create a newAndroidEngineering,We name itSpinnerdemo.

Step 2: OpenLayoutFolder, findMain. xmlChange the content:

<? XML version = "1.0" encoding = "UTF-8"?>

<Linearlayout xmlns: Android = "http://schemas.android.com/apk/res/android"

Android: Orientation = "vertical"

 Android: padding = "10dip"  


Android: layout_width = "fill_parent"

Android: layout_height = "wrap_content">

<Textview

Android: layout_width = "fill_parent"

Android: layout_height = "wrap_content"

 Android: layout_margintop = "10dip"

Android: text = "Please select a planet :"  


/>

 <Spinner

Android: Id = "@ + ID/Spinner"

Android: layout_width = "fill_parent"

Android: layout_height = "wrap_content"

Android: drawselectid Top = "true"

Android: prompt = "@ string/planet_prompt" 


/>  


</Linearlayout>

 Note:  


The spinner's  Android: Prompt 
 
 
  
Is a string resource. In this case, Android does not allow it to be a string, it must

Be a reference to a resource. So...



 Step 3  
: Find Res/values/string. XML,  
Add the following ( Simhei  
) Line:



<? XML version = "1.0" encoding = "UTF-8"?>

<Resources>

<String name = "hello"> Hello world, spinnerdemo! </String>

<String name = "app_name"> spinnerdemo </string>

 <String name = "planet_prompt"> choose a planet </string>  


</Resources>



 Step 4  
: In Res/values/  
Create a folder XML  
File named Arrays. xml:  




<Resources>  


 <String-array name = "planets">  


<Item> mercury </item>

<Item> Venus </item>

<Item> Earth </item>

<Item> Mars </item>

<Item> Jupiter </item>

<Item> Saturn </item>

<Item> Uranus </item>

<Item> Neptune </item>

 </String-array>  


</Resources>  


This is the option that you can select from the spinner widget list.



 Step 5  
: Open Spinnerdemo. Java  
, The edit content is as follows:



Package com. Android. test;

Import Android. App. activity;

Import Android. OS. Bundle;

 Import Android. widget. arrayadapter;

Import Android. widget. spinner;  


Public class Spinnerdemo  
Extends activity {

Public void oncreate (bundle savedinstancestate ){

Super. oncreate (savedinstancestate );

Setcontentview (R. layout. Main );

 Spinner S = (spinner) findviewbyid (R. Id. spinner );

Arrayadapter adapter = arrayadapter. createfromresource (

This, R. array. Planets, Android. R. layout. simple_spinner_item)



Adapter. setdropdownviewresource (Android. R. layout. simple_spinner_dropdown_item );

S. setadapter (adapter );  


}

}



 Step 6:  
Last Run it  
(Running) the effect is as follows:





After a long wait, we finally finished Japanese... android, English, I'm coming !!!!