获取应用及系统的版本号
http://www.cnblogs.com/qsl568/archive/2012/03/14/2395636.html

获取当前应用的版本号：

或者：
/*   *  * Build.VERSION_CODES    1 (0x00000001)           Android 1.0             BASE    2 (0x00000002)           Android 1.1             BASE_1_1    3 (0x00000003)           Android 1.5             CUPCAKE    4 (0x00000004)           Android 1.6             DONUT    5 (0x00000005)           Android 2.0             ECLAIR    6 (0x00000006)           Android 2.0.1          ECLAIR_0_1    7 (0x00000007)           Android 2.1             ECLAIR_MR1    8 (0x00000008)           Android 2.2             FROYO    9 (0x00000009)           Android 2.3             GINGERBREAD    10 (0x0000000a)         Android 2.3.3          GINGERBREAD_MR1    11 (0x0000000b)         Android 3.0             HONEYCOMB    12 (0x0000000c)         Android 3.1             HONEYCOMB_MR1    13 (0x0000000d)         Android 3.2             HONEYCOMB_MR2*/    /*获取当前系统的android版本号*/    int currentapiVersion=android.os.Build.VERSION.SDK_INT;