Android ---Check System Version at Runtime(在软件运行时检查判断系统版本)

本文介绍了如何在Android应用程序运行时使用Build类的VERSION和VERSION_CODES内部类来检查系统版本。通过SDK_INT获取版本信息,并根据版本代码进行条件判断,以适配不同API级别的功能。

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Android为我们提供了一个常量类Build,其中最主要是Build中的两个内部类VERSION和VERSION_CODES

VERSION表示当前系统版本的信息,其中就包括SDK的版本信息,用于成员SDK_INT表示;

对于VERSION_CODES在SDK开发文档中时这样描述的,Enumeration of the currently known SDK version codes. These are the values that can be found in SDK. Version numbers increment monotonically with each official platform release.

在我们自己开发应用过程中,常常使用如下的代码形式判断运行新API还是旧的API:

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) 
    {
            // 包含新API的代码块
    }
    else
    {
            // 包含旧的API的代码块
    }

以下为版本号:


 
intBASEOctober 2008: The original, first, version of Android.
intBASE_1_1February 2009: First Android update, officially called 1.1.
intCUPCAKEMay 2009: Android 1.5.
intCUR_DEVELOPMENTMagic version number for a current development build, which has not yet turned into an official release.
intDONUTSeptember 2009: Android 1.6.
intECLAIRNovember 2009: Android 2.0

Applications targeting this or a later release will get these new changes in behavior:

intECLAIR_0_1December 2009: Android 2.0.1
intECLAIR_MR1January 2010: Android 2.1
intFROYOJune 2010: Android 2.2
intGINGERBREADNovember 2010: Android 2.3

Applications targeting this or a later release will get these new changes in behavior:

  • The application's notification icons will be shown on the new dark status bar background, so must be visible in this situation.
intGINGERBREAD_MR1February 2011: Android 2.3.3.
intHONEYCOMBFebruary 2011: Android 3.0.
intHONEYCOMB_MR1May 2011: Android 3.1.
intHONEYCOMB_MR2June 2011: Android 3.2.
intICE_CREAM_SANDWICHOctober 2011: Android 4.0.
intICE_CREAM_SANDWICH_MR1December 2011: Android 4.0.3.
intJELLY_BEANJune 2012: Android 4.1.
intJELLY_BEAN_MR1Android 4.2: Moar jelly beans!

Applications targeting this or a later release will get these new changes in behavior:

  • Content Providers: The default value of android:exported is now false.

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