Method for judging the version number of current API in Android

In Android, there will be some changes in different versions of API, which may lead to some earlier versions not supporting new methods, or some functions are not handled in a way, so it is necessary to judge the current version and then carry out appropriate processing.

So, how do you judge the current version number of API?

For example, determine whether the api version number is greater than or equal to 19:

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

Where Build.VERSION_CODES. KITKAT = 19

What is Build.VERSION.SDK_INT:

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

Gets the value of "ro. build. version. sdk" in the system properties profile, which is the system version number of the current device.

The version number information for each version is contained under the Build.VERSION_CODES class in the frameworks\ base\ core\ java\ android\ os\ Build. java source code file.

The following is the source code under Android 7.0:

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 ¯\_( Phyllostachys )_/¯. Android 7.0
   */
  public static final int N = 24;
 }