Android中由于不同版本API会有一些变化，导致一些较早版本可能不支持新的方法，或者某些功能处理过程不太一样，需要判断当前版本然后进行适当的处理。

那么，如何判断当前API的版本号呢？

例如判断api版本号是否大于等于19：

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

其中，Build.VERSION_CODES.KITKAT = 19

Build.VERSION.SDK_INT是什么：

public static final int SDK_INT = SystemProperties.getInt("ro.build.version.sdk", 0);

获取系统属性配置文件中“ro.build.version.sdk”的值，该值即为当前设备的系统版本号。

在Android源码 frameworks\base\core\java\android\os\Build.java 文件中的 Build.VERSION_CODES 类下包含对应各个版本的版本号信息。

以下是Android 7.0版本下的源码：

public static class VERSION_CODES { /** * Magic version number for a current development build, which has * not yet turned into an official release. */ public static final int CUR_DEVELOPMENT = 10000; /** * October 2008: The original, first, version of Android. Yay! */ public static final int BASE = 1; /** * February 2009: First Android update, officially called 1.1. */ public static final int BASE_1_1 = 2; /** * May 2009: Android 1.5. */ public static final int CUPCAKE = 3; /** * September 2009: Android 1.6. */ public static final int DONUT = 4; /** * November 2009: Android 2.0 */ public static final int ECLAIR = 5; /** * December 2009: Android 2.0.1 */ public static final int ECLAIR_0_1 = 6; /** * January 2010: Android 2.1 */ public static final int ECLAIR_MR1 = 7; /** * June 2010: Android 2.2 */ public static final int FROYO = 8; /** * November 2010: Android 2.3 */ public static final int GINGERBREAD = 9; /** * February 2011: Android 2.3.3. */ public static final int GINGERBREAD_MR1 = 10; /** * February 2011: Android 3.0. */ public static final int HONEYCOMB = 11; /** * May 2011: Android 3.1. */ public static final int HONEYCOMB_MR1 = 12; /** * June 2011: Android 3.2. */ public static final int HONEYCOMB_MR2 = 13; /** * October 2011: Android 4.0. */ public static final int ICE_CREAM_SANDWICH = 14; /** * December 2011: Android 4.0.3. */ public static final int ICE_CREAM_SANDWICH_MR1 = 15; /** * June 2012: Android 4.1. */ public static final int JELLY_BEAN = 16; /** * Android 4.2: Moar jelly beans! */ public static final int JELLY_BEAN_MR1 = 17; /** * Android 4.3: Jelly Bean MR2, the revenge of the beans. */ public static final int JELLY_BEAN_MR2 = 18; /** * Android 4.4: KitKat, another tasty treat. */ public static final int KITKAT = 19; /** * Android 4.4W: KitKat for watches, snacks on the run. */ public static final int KITKAT_WATCH = 20 public static final int L = 21; /** * Lollipop. A flat one with beautiful shadows. But still tasty. Android 5.0 */ public static final int LOLLIPOP = 21; /** * Lollipop with an extra sugar coating on the outside! Android 5.1 */ public static final int LOLLIPOP_MR1 = 22 /** * M is for Marshmallow! Android 6.0 */ public static final int M = 23; /** * N is for ¯\_(ツ)_/¯. Android 7.0 */ public static final int N = 24; }

以上这篇Android中判断当前API的版本号方法就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。