获取安卓系统版本

public static boolean hasFroyo() {         // Can use static final constants like FROYO, declared in later versions         // of the OS since they are inlined at compile time. This is guaranteed behavior.      //2.2以上         return Build.VERSION.SDK_INT >= Build.VERSION_CODES.FROYO;     }     public static boolean hasGingerbread() {      //2.3以上         return Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD;     }     public static boolean hasHoneycomb() {      //3.0以上         return Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB;     }     public static boolean hasHoneycombMR1() {      //3.1以上         return Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR1;     }     public static boolean hasJellyBean() {      //4.1以上         return Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN;     }