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脚本之家。

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