android源码分析之类Build

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Build类包含了许多手机信息，如手机设备名，芯片名，制程商的名字，model，android软件版本，SDK，fingerprint等等重要信息。

一个关于Build的Demo

import android.os.Build;private void init() {    // TODO Auto-generated method stub    Log.i(TAG, "Build.ID:"+Build.ID);    Log.i(TAG, "Build.DISPLAY:"+Build.DISPLAY);    Log.i(TAG, "Build.PRODUCT:"+Build.PRODUCT);    Log.i(TAG, "Build.DEVICE:"+Build.DEVICE);    Log.i(TAG, "Build.BOARD:"+Build.BOARD);    Log.i(TAG, "Build.MANUFACTURER:"+Build.MANUFACTURER);    Log.i(TAG, "Build.BRAND:"+Build.BRAND);    Log.i(TAG, "Build.MODEL:"+Build.MODEL);    Log.i(TAG, "Build.BOOTLOADER:"+Build.BOOTLOADER);    Log.i(TAG, "Build.HARDWARE:"+Build.HARDWARE);    Log.i(TAG, "Build.SERIAL:"+Build.SERIAL);    //Log.i(TAG, "Build.SUPPORTED_ABIS:"+Build.SUPPORTED_ABIS);    //Log.i(TAG, "Build.SUPPORTED_32_BIT_ABIS:"+Build.SUPPORTED_32_BIT_ABIS);    //Log.i(TAG, "Build.SUPPORTED_64_BIT_ABIS:"+Build.SUPPORTED_64_BIT_ABIS);    Log.i(TAG, "Build.VERSION.INCREMENTAL:"+Build.VERSION.INCREMENTAL);    Log.i(TAG, "Build.VERSION.RELEASE:"+Build.VERSION.RELEASE);    Log.i(TAG, "Build.VERSION.SDK:"+Build.VERSION.SDK);    Log.i(TAG, "Build.VERSION.SDK_INT:"+Build.VERSION.SDK_INT);    Log.i(TAG, "Build.VERSION.CODENAME:"+Build.VERSION.CODENAME);    Log.i(TAG, "Build.TYPE:"+Build.TYPE);    Log.i(TAG, "Build.TAGS:"+Build.TAGS);    Log.i(TAG, "Build.FINGERPRINT:"+Build.FINGERPRINT);    Log.i(TAG, "Build.TIME:"+Build.TIME);    Log.i(TAG, "Build.USER:"+Build.USER);    Log.i(TAG, "Build.HOST:"+Build.HOST);    //Log.i(TAG, "Build.IS_DEBUGGABLE:"+Build.IS_DEBUGGABLE);}

Log信息如下：

11-27 08:02:22.975: I/MainActivity(13256): Build.ID:LRX22G11-27 08:02:22.975: I/MainActivity(13256): Build.DISPLAY:LRX22G release-keys11-27 08:02:22.975: I/MainActivity(13256): Build.PRODUCT:l9010_cla11-27 08:02:22.975: I/MainActivity(13256): Build.DEVICE:l9010_cla11-27 08:02:22.975: I/MainActivity(13256): Build.BOARD:msm891611-27 08:02:22.975: I/MainActivity(13256): Build.MANUFACTURER:Lanix11-27 08:02:22.975: I/MainActivity(13256): Build.BRAND:qcom11-27 08:02:22.975: I/MainActivity(13256): Build.MODEL:Ilium L95011-27 08:02:22.976: I/MainActivity(13256): Build.BOOTLOADER:unknown11-27 08:02:22.976: I/MainActivity(13256): Build.HARDWARE:qcom11-27 08:02:22.976: I/MainActivity(13256): Build.SERIAL:1ca7811b11-27 08:02:22.976: I/MainActivity(13256): Build.VERSION.INCREMENTAL:eng.android.2015112611-27 08:02:22.976: I/MainActivity(13256): Build.VERSION.RELEASE:5.0.211-27 08:02:22.976: I/MainActivity(13256): Build.VERSION.SDK:2111-27 08:02:22.976: I/MainActivity(13256): Build.VERSION.SDK_INT:2111-27 08:02:22.976: I/MainActivity(13256): Build.VERSION.CODENAME:REL11-27 08:02:22.976: I/MainActivity(13256): Build.TYPE:user11-27 08:02:22.976: I/MainActivity(13256): Build.TAGS:release-keys11-27 08:02:22.976: I/MainActivity(13256): Build.FINGERPRINT:LANIX/Ilium_L950/Ilium_L950:5.0.2/LRX22G/eng.android.20150828:user/release-keys11-27 08:02:22.976: I/MainActivity(13256): Build.TIME:144850302700011-27 08:02:22.976: I/MainActivity(13256): Build.USER:android11-27 08:02:22.976: I/MainActivity(13256): Build.HOST:C208

Build源码分析

基本属性

我们打开Build源码(./frameworks/base/core/java/android/os/Build.java)，大概的看一下源码：

public class Build {    private static final String TAG = "Build";    /** Value used for when a build property is unknown. */    public static final String UNKNOWN = "unknown";    /** Either a changelist number, or a label like "M4-rc20". */    public static final String ID = getString("ro.build.id");    /** A build ID string meant for displaying to the user */    public static final String DISPLAY = getString("ro.build.display.id");    /** The name of the overall product. */    public static final String PRODUCT = getString("ro.product.name");    /** The name of the industrial design. */    public static final String DEVICE = getString("ro.product.device");    /** The name of the underlying board, like "goldfish". */    public static final String BOARD = getString("ro.product.board");.............

Build类中主要是一些成员属性，这些属性看的眼熟不，对，如果你接触过手机的属性的话，那么你就会明白，这就是读取的手机属性值。

下面是我列的一个表格：

成员属性手机属性名手机属性值 ID ro.build.id LRX22G DISPLAY ro.build.display.id LRX22G release-keys PRODUCT ro.product.name l9010_cla DEVICE ro.product.device l9010_cla BOARD ro.product.board msm8916 MANUFACTURER ro.product.manufacturer Lanix BRAND ro.product.brand qcom MODEL ro.product.model Ilium L950 BOOTLOADER ro.bootloader unknown HARDWARE ro.hardware qcom SERIAL ro.serialno 1ca7811b SUPPORTED_ABIS ro.product.cpu.abilist armeabi-v7a,armeabi SUPPORTED_32_BIT_ABIS ro.product.cpu.abilist32 armeabi-v7a,armeabi SUPPORTED_64_BIT_ABIS ro.product.cpu.abilist64 INCREMENTAL ro.build.version.incremental eng.android.20151126 RELEASE ro.build.version.release 5.0.2 SDK ro.build.version.sdk 21 SDK_INT ro.build.version.sdk 21 CODENAME ro.build.version.codename REL TYPE ro.build.type user TAGS ro.build.tags release-keys FINGERPRINT ro.build.fingerprint LANIX/Ilium_L950/Ilium_L950:5.0.2/LRX22G/eng.android.20150828:user/release-keys TIME ro.build.date.utc 1448503027 USER ro.build.user android HOST ro.build.host C208 IS_DEBUGGABLE ro.debuggable 1

关于版本的成员属性

VERSION_CODES:        /**         * 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;     ........................     ........................        /**         * Android 4.4W: KitKat for watches, snacks on the run.         */        public static final int KITKAT_WATCH = 20;        /**         * Temporary until we completely switch to {@link #LOLLIPOP}.         * @hide         */        public static final int L = 21;        /**         * Lollipop.  A flat one with beautiful shadows.  But still tasty.         */        public static final int LOLLIPOP = 21;

下面这个列表是关于软件版本号的表格：

VERSION_CODES：

成员属性软件版本号 APK值 BASE 1.0 1 BASE_1_1 1.1 2 CUPCAKE 1.5 3 DONUT 1.6 4 ECLAIR 2.0 5 EECLAIR_0_1 2.0.1 6 ECLAIR_MR1 2.1 7 FROYO 2.2 8 GINGERBREAD 2.3 9 GINGERBREAD_MR1 2.3.3 10 HONEYCOMB 3.0 11 HONEYCOMB_MR1 3.1 12 HONEYCOMB_MR2 3.2 13 ICE_CREAM_SANDWICH 4.0 14 ICE_CREAM_SANDWICH_MR1 4.0.3 15 JELLY_BEAN 4.1 16 JELLY_BEAN_MR1 4.2 17 JELLY_BEAN_MR2 4.3 18 KITKAT 4.4 19 KITKAT_WATCH 4.4W 20 L 5.0 21 LOLLIPOP 5.0 21

关于fingerprint

先看代码：

private static String deriveFingerprint() {        String finger = SystemProperties.get("ro.build.fingerprint");        if (TextUtils.isEmpty(finger)) {            finger = getString("ro.product.brand") + '/' +                    getString("ro.product.name") + '/' +                    getString("ro.product.device") + ':' +                    getString("ro.build.version.release") + '/' +                    getString("ro.build.id") + '/' +                    getString("ro.build.version.incremental") + ':' +                    getString("ro.build.type") + '/' +                    getString("ro.build.tags");        }        return finger;}

代码非常明白的告诉我们，fingerprint有二种方式获取，
一种是直接读取：ro.build.fingerprint，
如果读取的ro.build.fingerprint信息为空，那么我们会使用拼接的方式获取fingerprint:
拼接的方式如下：

ro.product.brand+ro.product.name+ro.product.device+ro.build.version.release+ro.build.id+ro.build.version.incremental+ro.build.type+ro.build.tags

拼接结果如下：

qcom+l9010_cla+l9010_cla+5.0.2+LRX22G+eng.android.20151126+user+release-keys

我们直接读取的如果：

LANIX/Ilium_L950/Ilium_L950:5.0.2/LRX22G/eng.android.20150828:user/release-keys

如果，这二种方式得到的fingerprint不一致，在GMS认证时CTS测试会有一个fingerprint的测试fail项，我们只要对应此拼接的方式来修改对应的属性值，就可以把此Fail项解决。

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