Android学习笔记(一)——新建一个项目

  //此系列博文是《第一行Android代码》的学习笔记,如有错漏,欢迎指正!

1、打开Android Studio时出现以下界面,点击”start a new Android Studio project”来新建一个项目:

  Android学习笔记(一)——新建一个项目

2、出现以下界面,填好项目的名字和储存位置,点击next:

  Android学习笔记(一)——新建一个项目

3、选好Minimum SDK继续点击next:

  Android学习笔记(一)——新建一个项目

4、选择一个blank activity,点击next:

  Android学习笔记(一)——新建一个项目
5、为刚才的activity填写相关信息,然后点击next:

  Android学习笔记(一)——新建一个项目

  至此,一个project就建立好了。下面熟悉一下AS的操作界面。

● 可以在help-> find action 搜索color & fonts ,进入下面界面,设置字体和颜色:

  Android学习笔记(一)——新建一个项目

● 打开 AndroidManifest.xml 文件,从中可以找到如下代码:

<activity

android:name="com.test.helloworld.HelloWorldActivity"

android:label="@string/app_name" >

<intent-filter>

<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />

</intent-filter>

</activity>

  这段代码表示对 HelloWorldActivity这个活动进行注册,没有在AndroidManifest.xml 里注册的活动是不能使用的。其中 intent-filter 里的两行代码非常重要,

  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alt="" />

  表示 HelloWorldActivity 是这个项目的主活动,在手机上点击应用图标,首先启动的就是这个活动。

● Layout->activity_main.xml 是布局文件,决定着界面的布局

  Android学习笔记(一)——新建一个项目

● MainActivity是一个activity的逻辑实现:

  Android学习笔记(一)——新建一个项目

 此外res->drawable 是存储图片资源的,res->values->strings.xml是用来储存字符串资源的。例如刚刚在 strings.xml中找到的 Hello world!字符串,我们有两种方式可以引用它:

  1) 在代码中通过 R.string.hello_world 可以获得该字符串的引用;

  2) 在XML中通过@string/hello_world 可以获得该字符串的引用。

  //End.

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