Build类包含哪些信息

在项目的开发中，我们可能会与Build类打交道。例如，根据手机CPU的类型来进行so库的动态的下载；在用户登录时，可以获取用户手机型号，Android系统版本，手机序列号等信息。

Build类属于android.os包下，主要用于记录设备硬件和版本信息。

Build的内部类：VERSION_CODES，记录Android系统版本号常量，比如重要的14，21，23，24，26。

public static class VERSION_CODES {
        public static final int BASE = 1;
        public static final int BASE_1_1 = 2;
        public static final int CUPCAKE = 3;
        public static final int CUR_DEVELOPMENT = 10000;
        public static final int DONUT = 4;
        public static final int ECLAIR = 5;
        public static final int ECLAIR_0_1 = 6;
        public static final int ECLAIR_MR1 = 7;
        public static final int FROYO = 8;
        public static final int GINGERBREAD = 9;
        public static final int GINGERBREAD_MR1 = 10;
        public static final int HONEYCOMB = 11;
        public static final int HONEYCOMB_MR1 = 12;
        public static final int HONEYCOMB_MR2 = 13;
        public static final int ICE_CREAM_SANDWICH = 14;   // 4.0
        public static final int ICE_CREAM_SANDWICH_MR1 = 15;
        public static final int JELLY_BEAN = 16;
        public static final int JELLY_BEAN_MR1 = 17;
        public static final int JELLY_BEAN_MR2 = 18;
        public static final int KITKAT = 19;
        public static final int KITKAT_WATCH = 20;
        public static final int LOLLIPOP = 21;    // 5.0
        public static final int LOLLIPOP_MR1 = 22;
        public static final int M = 23;  // 6.0
        public static final int N = 24;  // 7.0
        public static final int N_MR1 = 25;
        public static final int O = 26;    // 8.0
        public static final int O_MR1 = 27;

        public VERSION_CODES() {
            throw new RuntimeException("Stub!");
        }
    }

Build的内部类VERSION，版本字符串

    public static class VERSION {
        public static final String BASE_OS = null;
        public static final String CODENAME = null;
        public static final String INCREMENTAL = null;
        public static final int PREVIEW_SDK_INT = 0;
        public static final String RELEASE = null;   //系统版本
        public static final String SDK = null;   //SDK版本
        public static final int SDK_INT = 0;
        public static final String SECURITY_PATCH = null;

        public VERSION() {
            throw new RuntimeException("Stub!");
        }
    }

通过Build获取设备硬件信息：

    public static final String BOARD = null;    //主板
    public static final String BOOTLOADER = null;   //系统启动程序版本号
    public static final String BRAND = null;  //系统定制商
    public static final String CPU_ABI = null;  //cpu指令集
    public static final String CPU_ABI2 = null; //cpu指令集2
    public static final String DEVICE = null;  //设备参数
    public static final String DISPLAY = null;  //显示屏参数
    public static final String FINGERPRINT = null;  //唯一识别码
    public static final String HARDWARE = null;  //硬件名称
    public static final String HOST = null;
    public static final String ID = null;  //修订版本列表
    public static final String MANUFACTURER = null;  //硬件制造商
    public static final String MODEL = null;  //手机型号，比如xiaomi5，vivox21
    public static final String PRODUCT = null;  //手机制造商，比如Huawei
    public static final String RADIO = null;  //无线电固件版本
    public static final String SERIAL = null;  硬件序列号
    public static final String[] SUPPORTED_32_BIT_ABIS = null;  //32位cpu指令集
    public static final String[] SUPPORTED_64_BIT_ABIS = null;  //64位cpu指令集
    public static final String[] SUPPORTED_ABIS = null;  
    public static final String TAGS = null;  //描述Build的标签
    public static final long TIME = 0L;
    public static final String TYPE = null;   //build的类型
    public static final String UNKNOWN = "unknown";
    public static final String USER = null;