获取手机版本号：Build.VERSION.SDK_INT

Build.VERSION_CODES类下面的版本信息：

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static int BASE //October 2008: The original, first, version of Android.   
static int BASE_1_1 //February 2009: First Android update, officially called 1.1.   
static int CUPCAKE //May 2009: Android 1.5.   
static int CUR_DEVELOPMENT //Magic version number for a current development build, which has not yet turned into an official release.   
static int DONUT //September 2009: Android 1.6.   
static int ECLAIR //November 2009: Android 2.0   
static int ECLAIR_0_1 //December 2009: Android 2.0.1   
static int ECLAIR_MR1 //January 2010: Android 2.1   
static int FROYO June //2010: Android 2.2   
static int GINGERBREAD //November 2010: Android 2.3   
static int GINGERBREAD_MR1 //February 2011: Android 2.3.3.   
static int HONEYCOMB //February 2011: Android 3.0.   
static int HONEYCOMB_MR1 //May 2011: Android 3.1.   
static int HONEYCOMB_MR2 //June 2011: Android 3.2.   
static int ICE_CREAM_SANDWICH //October 2011: Android 4.0.   
static int ICE_CREAM_SANDWICH_MR1 //December 2011: Android 4.0.3.   
static int JELLY_BEAN //June 2012: Android 4.1.   
static int JELLY_BEAN_MR1 //Android 4.2: Moar jelly beans!

在实际应用中可以这样判断：

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if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
  
}