Isual Studio Cross-platform development Combat (4)-Xamarin Android Basic Control Introduction

Source: Internet
Author: User

Originalisual Studio跨平台开发实战(4) - Xamarin Android基本控制项介绍

前言

不同于iOS, Xamarin 在Visual Studio中针对Android, 可以直接设计使用者介面. 在本篇教学文章中, 笔者会针对Android的专案目录结构以及基本控制项进行介绍, 包含TextView, EditView, Toggle/ Switch以及Seekbar控制项.

Android专案目录结构

在Visual Studio建立Android 应用程式专案后, ??在方案总管中会看到如的目录结构:

Assets:放置在Assets资料夹中的档案,将会一起被封装进Android的封装档中(建置动作要设定为"AndroidAsset").之后便可以透过如下的陈述式来存取Assets的资源。

1 <span class="notranslate"onmouseover="_tipon(this)" onmouseout= "_tipoff ( ) " ><span&NBSP; class = "Google-src-text"  style= "direction:ltr ; Text-align:left " > public  class  readasset:activity</span>&NBSP; public  class  READASSET:ACTIVITY</SPAN>
2 &NBSP;
3 <span&NBSP; class = "notranslate"   onmouseover= "_tipon (this)"  onmouseout= "_tipoff ()" ><span&NBSP; class = "Google-src-text"   style= "DIRECTION:LTR; Text-align:left " >{</span> {</span>
4
5 <span class="notranslate"onmouseover="_tipon(this)"onmouseout="_tipoff()"><span class="google-src-text" style= "direction:ltr ; Text-align:left " > protected  override  < Code class= "keyword" >void  oncreate (Bundle Bundle) {</span>&NBSP; protected  override  void  oncreate (bundle bundle) {</span>
6
7 <span class="notranslate" onmouseover="_tipon(this)" onmouseout="_tipoff()"><span class="google-src-text" style="direction: ltr; text-align: left">base.OnCreate (bundle);</span> base.OnCreate (bundle);</span>
8
9 <span class="notranslate" onmouseover= "_tipon ( This) "  onmouseout= "_tipoff ()" ><span&NBSP; class = "Google-src-text"  style= "direction:ltr ; Text-align:left " >inputstream input = Assets.open ( " My_ Asset.txt " "My_asset.txt"

Resources :包含Drawable, Layout以及Values ??资料夹. Drawable用来放置图片.依照装置的解析度不同,还可以新增drawable-hdpi, drawable-mdpi, drawable-ldpi等资料夹来存放不同解析度的档案. Layout资料夹则是存放使用者介面档(副档名为.axml). 而Value资料夹则是可以存放不同型别的XML对应档, 例如styles.xml, colors.xml… 针对Resources底下的档案,建置动作请设定为”AndroidResource”

若您开启预设的Main.axml, 会看到如同底下的XML描述

    • LinearLayout: 主要的页面框架, 以垂直或水平的方式排列页面上的物件, 相当于Silverlight 中的stack panel
    • @+id/[物件名称]: 告诉Android parser, 为物件建立一个resource id
    • @string/[名称]: 在String.xml中建立一个字串资源, 后续可供Resource类别存取.

上述的@string则会对应到资料夹Resources\Values??\String.xml

    • 名称Hello对应到UI中Button的Text属性
    • 名称ApplicationName对应到专案属性中的应用程式名称
    • 名称Hello2为自行定义的字串资源.

有了以上的基本概念后, 接下来我们来介绍Android的基本控制项。

TextView

1. 开启Lab03-BasicControls 专案并开启Layout资料夹下的TextView.axml

2. 从左边的工具列将TextView拖放到画面中, 双击TextView并编辑文字

3. 接着拖拉一个TextView, 并在右边的属性视窗设定textcolor为#2A3748, textsize为24dip

4. 再拖拉一个TextView并输入文字, 包含一个超连结. 在属性中将autolink的属性值改为web.

结果如下:连结文字会自动变成超连结.

5. 最后拖拉一个TextView并输入文字, 包含超过5位数的数字, 在属性中将autolink的属性值改为phone

结果如下: 数字被更改为超连结

6. 开启TextViewScreen.cs 并在OnCreate 事件中载入Layout中的TextView

SetContentView(Resource.Layout.TextView);

Isual Studio Cross-platform development Combat (4)-Xamarin Android Basic Control Introduction

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