Android中判断当前API的版本号方法

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呐喊教程。

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