{"id":5160,"date":"2024-02-28T12:53:28","date_gmt":"2024-02-28T04:53:28","guid":{"rendered":"https:\/\/blog.coderfan.org\/?p=5160"},"modified":"2024-03-20T15:23:14","modified_gmt":"2024-03-20T07:23:14","slug":"android-automotive-carservice-module-trimming","status":"publish","type":"post","link":"https:\/\/blog.coderfan.org\/en\/android-automotive-carservice-module-trimming.html","title":{"rendered":"Android Automotive\u4e4bCarService\u6a21\u5757\u88c1\u526a"},"content":{"rendered":"
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\n \t<\/i> Read Time:<\/span>4 Minute, 24 Second <\/div>\n\n <\/div>\n

\u8fd1\u671f\u5728\u79fb\u690d\u9002\u914dAndroid14\u7684\u8fc7\u7a0b\u4e2d\uff0c\u53d1\u73b0\u7cfb\u7edf\u5728\u542f\u52a8\u9636\u6bb5\u8001\u662f\u5728Console\u4e2d\u6253\u5370\u7c7b\u4f3c\u7684\u65e5\u5fd7\uff1a<\/p>\n\n\n\n

[   13.303945] servicemanager: Could not find android.hardware.automotive.IEvsEnumerator\/default in the VINTF manifest.<\/code><\/pre>\n\n\n\n
\u51fa\u73b0\u8fd9\u4efd\u65e5\u5fd7\u65f6\uff0c\u6211\u7b2c\u4e00\u65f6\u95f4\u68c0\u67e5\u4e86\u5bf9\u5e94\u7684\u670d\u52a1\uff0c\u786e\u5b9e\u6ca1\u6709\u96c6\u6210\u76f8\u5e94\u7684EVS HAL\u5b9e\u73b0\u3002\u4f46\u672c\u8eab\u8fd9\u4e9b\u5b9e\u73b0\u5728Android12.1\u4e2d\u4e5f\u6ca1\u6709\uff0c\u5728Android12.1\u542f\u52a8\u8fc7\u7a0b\u4e2d\u5374\u5e76\u4e0d\u4f1a\u6709\u76f8\u5173\u7684\u9519\u8bef\u65e5\u5fd7\u3002\u4ece\u65e5\u5fd7\u4fe1\u606f\u6765\u770b\uff0c\u53ef\u80fd\u8fd8\u4e0e\u5176\u4ed6\u914d\u7f6e\u76f8\u5173\u8054\u3002\u8ddf\u968f\u7740\u65e5\u5fd7\u4e2d\u7684\u7ebf\u7d22\uff0c\u7b80\u5355\u4e86\u89e3\u4e86\u4e00\u4e0bVINTF\u914d\u7f6e\uff0c\u5373\u4f7f\u5728\u6e05\u7406\u5b8cVINTF\u914d\u7f6e\u540e\u4ecd\u5b58\u5728\u8fd9\u7c7b\u9519\u8bef\uff0c\u8fd9\u8bf4\u660e\u95ee\u9898\u7684\u6839\u56e0\u5e76\u4e0d\u5728\u8fd9\u91cc\u3002<\/p>\n\n\n\n
\u5f53\u6211\u4f7f\u7528adb\u8fdb\u5165Android\u7cfb\u7edf\u5e76\u901a\u8fc7logcat\u67e5\u770b\u65e5\u5fd7\u65f6\uff0c\u53d1\u73b0CarService\u4f1a\u9891\u7e41\u6253\u5370\u4e0eCarEvsService\u76f8\u5173\u8054\u7684\u65e5\u5fd7\uff0c\u4ece\u65e5\u5fd7\u6765\u770b\u5b58\u5728\u62a5\u9519\u63d0\u793a\u672a\u80fd\u6210\u529f\u8fde\u63a5EVS HAL\u670d\u52a1\uff0c\u6240\u4ee5\u95ee\u9898\u5927\u6982\u7387\u5c31\u51fa\u73b0\u5728\u8fd9\u91cc\u3002<\/p>\n\n\n\n
\u5728\u6211\u7684\u8fd9\u7bc7\u6587\u7ae0<\/a>\u4e2d\uff0c\u8be6\u7ec6\u4ecb\u7ecd\u4e86EVS\u7684\u6846\u67b6\uff0c\u5176\u9664\u4e86\u5728Native\u5c42\u62e5\u6709\u4e09\u4e2a\u670d\u52a1\uff08EVS HAL,EVS Manager,EVS APP\uff09\u4e4b\u5916\uff0c\u5728CarService\u4e2d\u8fd8\u63d0\u4f9b\u4e86\u4e00\u4e2aCarEvsManager\u4e0eCarEvsService\uff1b\u5728CarEvsService\u4e2d\u4fbf\u4f1a\u5c1d\u8bd5\u8fde\u63a5EVS Manager;\u6211\u4eec\u5728\u7cfb\u7edf\u542f\u52a8\u9636\u6bb5\u770b\u5230\u7684\u65e5\u5fd7\u4fe1\u606f\uff0c\u5c31\u662f\u7531\u4e8eCarEvsService\u542f\u52a8\u540e\u65e0\u6cd5\u8fde\u63a5\u5230EVS Manager\u5bfc\u81f4\u7684\u3002<\/p>\n\n\n\n
\u90a3\u4e48\u95ee\u9898\u6765\u4e86\uff0c\u5982\u679c\u6211\u4eec\u7684\u7cfb\u7edf\u5728\u5b9a\u5236\u65f6\u6ca1\u6709\u96c6\u6210\u76f8\u5173\u7684\u6846\u67b6\u80fd\u529b\uff0c\u5982\u4f55\u5728CarService\u4e2d\u4e5f\u5bf9\u76f8\u5e94\u7684\u6a21\u5757\u8fdb\u884c\u5c4f\u853d\u5462\u3002\u9488\u5bf9\u8fd9\u4e2a\u95ee\u9898\uff0c\u6211\u4eec\u9996\u5148\u9700\u8981\u5bf9CarService\u8fdb\u884c\u5206\u6790\u3002<\/p>\n\n\n\n
CarService\u7b80\u4ecb<\/h3>\n\n\n\n
CarService\u662fAndroid Automotive\u6240\u63d0\u4f9b\u7684\u6838\u5fc3\u670d\u52a1\uff0c\u4f17\u591a\u7684Automotive\u7279\u6027\u90fd\u4f9d\u8d56\u4e8e\u8be5\u670d\u52a1\uff1bAndroid12.1\u4e2dCarService\u6e90\u7801\u4f4d\u4e8e\/packages\/services\/Car\/service\/\uff0cAndroid14.0\u4e2d\u6e90\u7801\u4f4d\u4e8epackages\/services\/Car\/service-builtin\uff0c\u7f16\u8bd1\u4ea7\u7269\u5747\u4e3aCarService.apk.<\/p>\n\n\n\n
\u7f16\u8bd1\u65f6\u4e0eCar\u76f8\u5173\u7684\u6240\u6709\u7f16\u8bd1\u914d\u7f6e\u90fd\u5728packages\/services\/Car\/car_product\/buil\/car.mk\u4e2d\uff0c\u5728\u8be5makefile\u4e2d\u53c8include\u4e86car_base.mk,\u5173\u4e8eCarService\u7684\u6574\u4f53\u5e94\u7528\u6846\u67b6\uff0c\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
CarService\u6240\u63d0\u4f9b\u7684\u7edd\u5927\u90e8\u5206\u529f\u80fd\u4f4d\u4e8eandroi.car\u5e93\uff0c\u5176\u6e90\u7801\u4f4d\u7f6e\/packages\/services\/Car\/car-lib\uff0c\u5728\u8be5\u76ee\u5f55\u4e0b\u7684Android.bp\u901a\u8fc7java_library\u5b57\u6bb5\u5b9a\u4e49\u4e86\u540d\u4e3aandroid.car\u7684Java\u5e93\uff0c\u4ece\u800c\u4f9b\u5e94\u7528\u4f7f\u7528\u3002<\/p>\n\n\n\n
\u5728CarService\u4e2d\uff0c\u5305\u542b\u4e86\u4f17\u591a\u7684\u5b50Service\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n\n\n\n
\u670d\u52a1\u5b57\u6bb5<\/td>\u4f5c\u7528<\/td><\/tr>
AUDIO_SERVICE<\/td>\u97f3\u9891\u76f8\u5173<\/td><\/tr>
SENSOR_SERVICE<\/td>\u8f66\u8eab\u4f20\u611f\u5668\u4fe1\u606f<\/td><\/tr>
INFO_SERVICE<\/td> <\/td><\/tr>
APP_FOCUS_SERVICE<\/td> <\/td><\/tr>
PACKAGE_SERVICE<\/td>\u5305\u7ba1\u7406\u76f8\u5173<\/td><\/tr>
CAR_OCCUPANT_ZONE_SERVICE<\/td> <\/td><\/tr>
CAR_NAVIGATION_SERVICE<\/td>\u5bfc\u822a\u76f8\u5173<\/td><\/tr>
CABIN_SERVICE<\/td>\u5ea7\u8231\u5185\u76f8\u5173\u670d\u52a1<\/td><\/tr>
DIAGNOSTIC_SERVICE<\/td>\u8bca\u65ad\u76f8\u5173\u670d\u52a1<\/td><\/tr>
HVAC_SERVICE<\/td>\u7a7a\u8c03\u76f8\u5173<\/td><\/tr>
POWER_SERVICE<\/td>\u7535\u6e90\u7ba1\u7406\u76f8\u5173<\/td><\/tr>
PROJECTION_SERVICE<\/td> <\/td><\/tr>
PROVERTY_SERVICE<\/td> \u83b7\u53d6\u548c\u7ba1\u7406\u8bbe\u5907\u5c5e\u6027\u76f8\u5173<\/td><\/tr>
VENDOR_EXTENSION_SERVICE<\/td> <\/td><\/tr>
CAR_INSTRUMENT_CLUSTER_SERVICE<\/td>\u4eea\u8868\u4ea4\u4e92\u76f8\u5173<\/td><\/tr>
BLUETOOTH_SERVICE<\/td>\u84dd\u7259\u76f8\u5173<\/td><\/tr>
STORAGE_MONITORING_SERVICE<\/td>\u5b58\u50a8\u76f8\u5173<\/td><\/tr>
CAR_MEDIA_SERVICE<\/td>\u591a\u5a92\u4f53\u76f8\u5173<\/td><\/tr>
CAR_INPUT_SERVICE<\/td>\u6309\u952e\u3001\u89e6\u6478\u7b49Input\u76f8\u5173<\/td><\/tr>
CAR_ACTIVITY_SERVICE<\/td>\u8f66\u8f7d\u5e94\u7528\u4e2d\u7684Activity\u7ba1\u7406\u76f8\u5173<\/td><\/tr>
CAR_USER_SERVICE<\/td>\u591a\u7528\u6237\u7ba1\u7406\u76f8\u5173<\/td><\/tr>
CAR_EVS_SERVICE<\/td>EVS\u6846\u67b6\u63a5\u5165<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\u6211\u4eec\u5728\u4f7f\u7528CarService\u65f6\uff0c\u53ef\u4ee5\u901a\u8fc7\u5176\u63d0\u4f9b\u7684getCarManager\u65b9\u6cd5\u83b7\u53d6\u5bf9\u5e94\u7684\u5b50Manager\uff0c\u4ece\u800c\u8fde\u63a5\u5bf9\u5e94\u7684\u5b50Service\uff1b\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n\n\n\n
CarEvsManager evsManager = (CarEvsManager) car.getCarManager(Car.CAR_EVS_SERVICE);<\/code><\/pre>\n\n\n\n
CarService\u542f\u52a8<\/h3>\n\n\n\n
CarService\u5728Android Automotive\u4e2d\u5c5e\u4e8e\u7cfb\u7edf\u7ea7\u522b\u670d\u52a1\uff0c\u7531SystemServer\u62c9\u8d77\uff0c\u62c9\u8d77\u8fc7\u7a0b\u4e2d\u4e3b\u8981\u4f9d\u8d56\u4e8eCarServiceHelperService\u670d\u52a1\uff0c\u9996\u5148\u6211\u4eec\u770b\u770b\u5982\u4f55\u5728SystemServer\u4e2d\u542f\u52a8CarServiceHelperService\uff1a<\/p>\n\n\n\n
\/\/ frameworks\/base\/services\/java\/com\/android\/server\/SystemServer.java\nprivate static final String CAR_SERVICE_HELPER_SERVICE_CLASS =\n            \"com.android.internal.car.CarServiceHelperService\";\nprivate void startOtherServices(@NonNull TimingsTraceAndSlog t) {\n\u2026\u2026\n\tif (mPackageManager.hasSystemFeature(PackageManager.FEATURE_AUTOMOTIVE)) {\n                t.traceBegin(\"StartCarServiceHelperService\");\n                mSystemServiceManager.startService(CAR_SERVICE_HELPER_SERVICE_CLASS);\n                t.traceEnd();\n            }\n     }\n<\/code><\/pre>\n\n\n\n
\u8fd9\u91cc\u6211\u4eec\u53ef\u4ee5\u770b\u5230CarServiceHelperService\u7684\u542f\u52a8\u662f\u5728system_server\u7684startOtherServices\u4e2d\u8fdb\u884c\uff0c\u8c03\u7528\u7684\u662fSystemServiceManager.java\u4e2d\u63d0\u4f9b\u7684startService\u65b9\u6cd5\u3002<\/p>\n\n\n\n
\/**\n * Starts a service by class name.\n *\n * @return The service instance.\n *\/\npublic SystemService startService(String className) {\n\tfinal Class<SystemService> serviceClass = loadClassFromLoader(className,\n\tthis.getClass().getClassLoader());\n\treturn startService(serviceClass);\n}\n\n\/*\n * Loads and initializes a class from the given classLoader. Returns the class.\n *\/\n@SuppressWarnings(\"unchecked\")\nprivate static Class<SystemService> loadClassFromLoader(String className,ClassLoader classLoader) {\n    try {\n        return (Class<SystemService>) Class.forName(className, true, classLoader);\n    } catch (ClassNotFoundException ex) {\n        throw new RuntimeException(\"Failed to create service \" + className\n                + \" from class loader \" + classLoader.toString() + \": service class not \"\n                + \"found, usually indicates that the caller should \"\n                + \"have called PackageManager.hasSystemFeature() to check whether the \"\n                + \"feature is available on this device before trying to start the \"\n                + \"services that implement it. Also ensure that the correct path for the \"\n    }\n}<\/code><\/pre>\n\n\n\n
\u8fd9\u91cc\u901a\u8fc7classLoader\u62ff\u5230CarServiceHelperService\u7684class\u5bf9\u8c61\uff0c\u8fdb\u800c\u901a\u8fc7startService\u91cd\u8f7d\u8c03\u7528\u5bf9\u5e94service\u7684onStart\u65b9\u6cd5\uff1a<\/p>\n\n\n\n
\/\/frameworks\/base\/services\/core\/java\/com\/android\/server\/SystemServiceManager.java\n\/\/startService\u91cd\u8f7d\uff0c\u901a\u8fc7\u8c03\u7528\u5bf9\u5e94service\u7684onStart\u65b9\u6cd5\u542f\u52a8\u5bf9\u5e94\u7684Service\npublic void startService(@NonNull final SystemService service) {\n    \/\/ Register it.\u5c06\u5bf9\u5e94\u7684service\u5bf9\u8c61\u4fdd\u5b58\u81f3mService\u6240\u5bf9\u5e94\u7684list\u4e2d\n    mServices.add(service);\n    \/\/ Start it.\n    long time = SystemClock.elapsedRealtime();\ntry {\n        \/\/\u901a\u8fc7onStart\u8fdb\u884c\u542f\u52a8\n        service.onStart();\n    } catch (RuntimeException ex) {\n        throw new RuntimeException(\"Failed to start service \" + service.getClass().getName()\n                + \": onStart threw an exception\", ex);\n    }\n    warnIfTooLong(SystemClock.elapsedRealtime() - time, service, \"onStart\");\n}<\/code><\/pre>\n\n\n\n
\u63a5\u4e0b\u6765\u6211\u4eec\u8fdb\u5165CarServiceHelperService\uff0c\u770b\u770b\u5176onStart\u5177\u4f53\u505a\u4e86\u54ea\u4e9b\u4e8b\u60c5\uff1a<\/p>\n\n\n\n
\/\/frameworks\/opt\/car\/services\/src\/com\/android\/internal\/car\/CarServiceHelperService.java\n@Override\npublic void onStart() {\n\tEventLog.writeEvent(EventLogTags.CAR_HELPER_START);\n\tIntentFilter filter = new IntentFilter(Intent.ACTION_REBOOT);\n\tfilter.addAction(Intent.ACTION_SHUTDOWN);\n\tmContext.registerReceiverForAllUsers(mShutdownEventReceiver, filter, null, null);\n\tmCarWatchdogDaemonHelper.addOnConnectionChangeListener(mConnectionListener);\n\tmCarWatchdogDaemonHelper.connect();\n\tIntent intent = new Intent();\n\tintent.setPackage(\"com.android.car\");\n\tintent.setAction(CAR_SERVICE_INTERFACE);\n       \/\/\u901a\u8fc7intent\u542f\u52a8car service\n\tif (!mContext.bindServiceAsUser(intent, mCarServiceConnection, Context.BIND_AUTO_CREATE,mHandler, UserHandle.SYSTEM)) {\n\t\tSlogf.wtf(TAG, \"cannot start car service\");\n\t}\n\tloadNativeLibrary();\n}<\/code><\/pre>\n\n\n\n
\u8fd9\u91cc\u6211\u4eec\u53ef\u4ee5\u770b\u5230\uff0cCarServiceHelperService\u7684onStart\u4e2d\u4f1a\u901a\u8fc7intent\u53bb\u542f\u52a8\u6211\u4eec\u7684CarService\uff0c\u5176\u5bf9\u5e94\u7684\u5305\u540d\u4e3acom.android.car\uff0c\u901a\u8fc7Context.BIND_AUTO_CREATE\u6807\u5fd7\u6765\u81ea\u542f\u52a8\u670d\u52a1\uff08\u4f1a\u81ea\u52a8\u8c03\u7528\u670d\u52a1\u7684onCreate\u65b9\u6cd5\uff09\u3002<\/p>\n\n\n\n
\u7d27\u63a5\u7740\u6211\u4eec\u6765\u5206\u6790CarService\u7684onBind\uff0c\u5176\u5185\u90e8\u5b9e\u73b0\u5f88\u7b80\u5355\uff0c\u5c31\u662f\u8fd4\u56de\u4e86\u4e00\u4e2a\u540d\u4e3amICarImpl\u7684\u5b9e\u4f8b\u5bf9\u8c61\uff0c\u8be5\u5b9e\u4f8b\u5bf9\u8c61\u662f\u5728CarService\u7c7b\u7684onCreate\u8fdb\u884c\u5b9e\u4f8b\u5316\u7684\uff1a<\/p>\n\n\n\n
@Override\npublic void onCreate() {\n\t.....\n       \/\/\u83b7\u53d6Vehicle\u670d\u52a1\u5bf9\u8c61\n\tmVehicle = getVehicle();\n      \/\/CarService\u5b9e\u73b0 \u5b9e\u4f8b\u5316\n\tmICarImpl = new ICarImpl(this,\n\tmVehicle,\n\tSystemInterface.Builder.defaultSystemInterface(this).build(),\n\tmVehicleInterfaceName);\n       \/\/\u901a\u8fc7init\u65b9\u6cd5\u8fdb\u884c\u521d\u59cb\u5316\n\tmICarImpl.init();\n\tlinkToDeath(mVehicle, mVehicleDeathRecipient);\n       \/\/\u6dfb\u52a0\u5230servicemanager\n\tServiceManager.addService(\"car_service\", mICarImpl);\n\tSystemProperties.set(\"boot.car_service_created\", \"1\");\n\tsuper.onCreate();\n}<\/code><\/pre>\n\n\n\n
\u63a5\u7740\u6211\u4eec\u6765\u5230ICarImpl\u7c7b\u7684\u5b9e\u73b0\uff0c\u770b\u770b\u5176init\u65b9\u6cd5\uff1a<\/p>\n\n\n\n
@MainThread\nvoid init() {\nLimitedTimingsTraceLog t = new LimitedTimingsTraceLog(CAR_SERVICE_INIT_TIMING_TAG,\n\tTrace.TRACE_TAG_SYSTEM_SERVER, CAR_SERVICE_INIT_TIMING_MIN_DURATION_MS);\n\tt.traceBegin(\"ICarImpl.init\");\n\tt.traceBegin(\"VHAL.init\");\n\tmHal.init();\n\tt.traceEnd();\n\tt.traceBegin(\"CarService.initAllServices\");\n       \/\/\u521d\u59cb\u5316\u5404\u4e2a\u5b50service\uff0c\u8c03\u7528\u5404\u5b50service\u7684init\u65b9\u6cd5\n\tfor (CarServiceBase service : mAllServices) {\n\t\tt.traceBegin(service.getClass().getSimpleName());\n\t\tservice.init();\n\t\tt.traceEnd();\n\t}\n\tt.traceEnd(); \/\/ \"CarService.initAllServices\"\n\tt.traceEnd(); \/\/ \"ICarImpl.init\"\n}<\/code><\/pre>\n\n\n\n
\u8fd9\u91cc\u6211\u4eec\u53ef\u4ee5\u770b\u5230\uff0cCarService\u542f\u52a8\u65f6\u4f1a\u901a\u8fc7for\u5faa\u73af\u53bb\u8c03\u7528\u6bcf\u4e2a\u5b50service\u7684init\u65b9\u6cd5\uff0c\u4ece\u800c\u5b8c\u6210\u542f\u52a8\u8fc7\u7a0b\u4e2d\u7684\u521d\u59cb\u5316\uff1b\u5176\u4e2dmAllService\u662f\u4e00\u4e2a\u6570\u7ec4\uff0c\u5176\u5305\u542b\u7684\u5143\u7d20\u4e3aCarService\u4e2d\u5bf9\u5e94\u7684\u5404\u4e2a\u5b50service\u5b9e\u4f8b\uff0c\u7531\u6b64\u5b8c\u6210CarService\u7684\u521d\u59cb\u5316\u6d41\u7a0b<\/p>\n\n\n\n
\u5728\u4e86\u89e3\u5b8c\u5176\u542f\u52a8\u6d41\u7a0b\u540e\uff0c\u6211\u4eec\u81ea\u7136\u4f1a\u60f3\u5230mAllService\u6570\u7ec4\u5185\u7684\u5143\u7d20\u5230\u5e95\u662f\u4ece\u54ea\u91cc\u6765\u7684\u5462\uff0c\u5982\u679c\u6211\u4eec\u63a7\u5236\u53ef\u4ee5\u63a7\u5236\u8be5\u6570\u7ec4\u5185\u7684\u5143\u7d20\uff0c\u662f\u4e0d\u662f\u5c31\u80fd\u5b9e\u73b0CarService\u7684\u88c1\u526a\uff0c\u8fd9\u5c31\u662f\u6211\u4eec\u8fdb\u884cCarService\u6a21\u5757\u88c1\u526a\u7684\u5173\u952e\u3002<\/p>\n\n\n\n
CarFeatureController<\/h3>\n\n\n\n
\u5728CarService\u4e2d\uff0cCarFeatureController\u7528\u4e8e\u89e3\u6790\u914d\u7f6e\uff0c\u4ece\u800c\u63a7\u5236\u521d\u59cb\u5316\u9636\u6bb5\u9700\u8981\u8fdb\u884c\u521d\u59cb\u5316\u7684\u5b50\u670d\u52a1\uff1b\u6bd4\u5982CarEvsService\u7684\u521d\u59cb\u5316\u5c31\u4f9d\u8d56\u4e8eCarFeatureController:<\/p>\n\n\n\n
if (mFeatureController.isFeatureEnabled(Car.CAR_EVS_SERVICE)) {\n    mCarEvsService = constructWithTrace(t, CarEvsService.class,\n    () -> new CarEvsService(serviceContext, mHal.getEvsHal(), mCarPropertyService));\n} else {\n    mCarEvsService = null;\n}\nCarFeatureController\u7531ICarImpl\u8fdb\u884c\u5b9e\u4f8b\u5316:\nmFeatureController = constructWithTrace(t, CarFeatureController.class,\n    () -> new CarFeatureController(serviceContext, defaultEnabledFeatures,\n    disabledFromVhal, mSystemInterface.getSystemCarDir()));<\/code><\/pre>\n\n\n\n
\u5176\u4e2ddefaultEnabledFeatures\u4ee3\u8868CarService\u4e2d\u9ed8\u8ba4\u652f\u6301\u7684\u7279\u6027\uff0c\u53ef\u4ee5\u901a\u8fc7\/packages\/services\/Car\/service\/res\/values\/config.xml\u8fdb\u884c\u914d\u7f6e\uff1a<\/p>\n\n\n\n
defaultEnabledFeatures = res.getStringArray(R.array.config_allowed_optional_car_features);<\/code><\/pre>\n\n\n\n
\u5728Android12\u4e0e14\u4e2d\uff0c\u5176\u5177\u4f53\u914d\u7f6e\u5982\u4e0b\uff1a<\/p>\n\n\n\n
<string-array translatable=\"false\" name=\"config_allowed_optional_car_features\">\n      <item>car_navigation_service<\/item>\n      <item>cluster_service<\/item>\n      <item>com.android.car.user.CarUserNoticeService<\/item>\n      <item>diagnostic<\/item>\n      <item>storage_monitoring<\/item>\n      <item>vehicle_map_service<\/item>\n      <item>car_evs_service<\/item>\n      <item>car_telemetry_service<\/item>\n<\/string-array><\/code><\/pre>\n\n\n\n
\u5728CarFeatureController\u521d\u59cb\u5316\u65f6\uff0c\u4f1a\u4f20\u5165\u9ed8\u8ba4\u652f\u6301\u7684feature\u7279\u6027\uff0c\u8fd8\u4f1a\u8bfb\u53d6\u4e00\u4e2a\u540d\u4e3acar_feature_config.txt\u7684\u914d\u7f6e\u6587\u4ef6\uff08\u5982\u679c\u5b58\u5728\uff09\uff0c\u5728CarFeatureController\u4e2d\uff0c\u5176\u5185\u90e8\u6210\u5458\u53d8\u91cfmEnabledFeatures\u662f\u4e00\u4e2aHashSet\uff0c\u7528\u4e8e\u5b58\u50a8\u8bb0\u5f55\u9700\u8981\u652f\u6301\u7684\u7279\u6027\uff0c\u8fd9\u4e9b\u7279\u6027\u90fd\u6709\u76f8\u5bf9\u5e94\u7684\u5b50Service\uff1b\u8fd9\u4e9b\u7279\u6027\u5206\u4e3a\u5f3a\u5236\u7684\uff08MANDATORY_FEATURES\uff09\u548c\u53ef\u9009\u7684\uff08OPTIONAL_FEATURES\uff09\u4e24\u79cd;\u6700\u540e\u5b8c\u6574\u652f\u6301\u7684feature\u90fd\u4f1a\u88ab\u8bb0\u5f55\u5728SUPPORT_FEATURES\u5185\uff1b<\/p>\n\n\n\n
\u6240\u4ee5\u5f53\u6211\u4eec\u9700\u8981\u5bf9CarService\u8fdb\u884c\u6a21\u5757\u88c1\u526a\u65f6\uff0c\u6211\u4eec\u9700\u8981\u5148\u786e\u8ba4\u8be5\u6a21\u5757\u662f\u5426\u662foptional\u7684\uff0c\u5982\u679c\u662foptional\u7684\u6a21\u5757\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4fee\u6539\u539f\u751f\u914d\u7f6e\u6216\u8005Overlay\u539f\u751f\u914d\u7f6e\u7684\u65b9\u5f0f\u8986\u76d6config.xml\u4e2d\u5173\u4e8econfig_allowed_optional_car_features\u7684\u914d\u7f6e\uff1b\u5982\u679c\u662f\u539f\u751f\u5f3a\u5236\u652f\u6301\u7684\u7279\u6027\uff0c\u53ef\u4ee5\u901a\u8fc7\u4fee\u6539\u6e90\u7801\u6216\u8005\u5b9a\u5236car_feature_config.txt\u7684\u914d\u7f6e\u6765\u5b9e\u73b0\u3002<\/p>\n\n\n\n
\u8fd9\u91cc\u8fd8\u5b58\u5728\u4e00\u4e2a\u5c0f\u7ec6\u8282\uff0c\u5373\/packages\/services\/Car\/service\/res\/values\/config.xml\u5e76\u4e0d\u662f\u6253\u5305\u5230CarService\u4e2d\uff0c\u800c\u662f\u6253\u5305\u5230\u4e86CarServiceUpdatableNonModule\u4e2d\uff0c\u5728\u6211\u4eec\u5b8c\u6210\u4fee\u6539\u540e\u7528aapt2\u8fdb\u884c\u521d\u6b65\u786e\u8ba4\u65f6\uff0c\u9700\u8981\u68c0\u67e5\u7684\u662fCarServiceUpdatableNonModule.apk\u800c\u975eCarService.apk\u3002<\/p>\n\n\n\n
\u64cd\u4f5c\u5b9e\u8df5<\/h3>\n\n\n\n
\u5728\u6211\u9047\u5230\u7684\u573a\u666f\u91cc,CarEvsService\u5c5e\u4e8e\u53ef\u9009\u9879\uff0c\u4e3a\u4e86\u907f\u514d\u5bf9\u539f\u751f\u7cfb\u7edf\u9020\u6210\u4fb5\u5165\u5f0f\u4fee\u6539\uff0c\u6211\u9009\u62e9\u4f7f\u7528Overlay\u7684\u5f62\u5f0f\u6765\u505a\u5b9a\u5236\u5316\u914d\u7f6e\uff0c\u5177\u4f53\u6b65\u9aa4\u5206\u4e3a\u5982\u4e0b\u51e0\u6b65\uff1a<\/p>\n\n\n\n
1.\u5728device\u76ee\u5f55\u4e0b\u521b\u5efaOverlay\u7684\u914d\u7f6e\u6587\u4ef6\u5939\uff0c\u653e\u5165Overlay\u7684\u914d\u7f6e<\/p>\n\n\n\n
2.\u5728device.mk\u4e2d\u901a\u8fc7DEVICE_PACKAGE_OVERLAYS\u914d\u7f6eOverlay<\/p>\n\n\n\n
3.\u91cd\u65b0\u8fdb\u884c\u7f16\u8bd1\u6253\u5305\uff0c\u6d4b\u8bd5\u9a8c\u8bc1\uff1b\u521d\u6b65\u9a8c\u8bc1\u65f6\u6211\u4eec\u53ef\u4ee5\u501f\u52a9aapt2\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n\n\n\n
$aapt dump strings CarServiceUpdatableNonModule.apk\nString pool of 15786 unique UTF-8 non-sorted strings, 15786 entries and 0 styles using 1280560 bytes:\nString #0 : car_navigation_service\nString #1 : cluster_service\nString #2 : com.android.car.user.CarUserNoticeService\nString #3 : diagnostic\nString #4 : storage_monitoring\nString #5 : vehicle_map_service\nString #6 : car_telemetry_service\n<\/code><\/pre>\n\n\n\n
\u6211\u4eec\u53ef\u4ee5\u770b\u5230\uff0c\u5728\u8fdb\u884cOverlay\u4e4b\u540e\uff0ccar_evs_service\u914d\u7f6e\u5df2\u7ecf\u4e0d\u5728\u4e86\uff0c\u8fd9\u6837CarService\u4e5f\u5c31\u4e0d\u4f1a\u518d\u53bb\u521d\u59cb\u5316CarEvsService\uff0c\u6211\u4eec\u4e5f\u5c31\u5b9e\u73b0\u4e86\u5bf9CarService\u7684\u88c1\u526a\u3002<\/p>\n\n\n\n
\u5173\u4e8eOverlay\u7684\u66f4\u591a\u7ec6\u8282\uff0c\u53ef\u4ee5\u53c2\u8003\u6211\u7684\u6587\u7ae0<\/a>\uff0c\u5e0c\u671b\u5bf9\u5404\u4f4d\u6709\u6240\u5e2e\u52a9~<\/p>\n        
\n            
\n                \n                
\n                    \n                        \"Happy\"\n                    <\/a>\n                    
\n                        Happy                    <\/div>\n                    
\n                                                    2<\/span>\n                        \n                                                100<\/span> %<\/span>\n                                            <\/div>\n                <\/div>\n\n                
\n                    \n                        \"Sad\"\n                    <\/a>\n                    
\n                        Sad                    <\/div>\n                    
\n                                                    0<\/span>\n                                                                        0<\/span> %<\/span>\n                                            <\/div>\n                <\/div>\n\n                
\n                    \n                        \"Excited\"\n                    <\/a>\n                    
\n                        Excited                    <\/div>\n                    
\n                                                    0<\/span>\n                                                                        0<\/span> %<\/span>\n                                            <\/div>\n                <\/div>\n\n                
\n                    \n                        \"Sleepy\"\n                    <\/a>\n                    
\n                        Sleepy                    <\/div>\n                    
\n                                                    0<\/span>\n                        \n                                                0<\/span> %<\/span>\n                                            <\/div>\n                <\/div>\n\n                
\n                    \n                        \"Angry\"\n                    <\/a>\n                    
Angry<\/div>\n                    
\n                                                    0<\/span>\n                                                                        0<\/span> %<\/span>\n                        \n                    <\/div>\n                <\/div>\n\n                
\n                    \n                        \"Surprise\"\n                    <\/a>\n                    
Surprise<\/div>\n                    
\n                                                    0<\/span>\n                                                                        0<\/span> %<\/span>\n                                            <\/div>\n                <\/div>\n\n            <\/div>\n        <\/div>","protected":false},"excerpt":{"rendered":"
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