民宿网站开发dfd图,南京建设网站制作,微信公众号关联网站,wordpress 执行sql应用对于Android系统来说至关重要#xff0c;系统会有几个时机对APP进行解析#xff0c;一个是APK安装的时候会进行解析#xff0c;还有一个就是系统在重启之后会进行解析#xff0c;这里就简单的记录一下重启的时候APK的解析过程。
一、SystemServer
系统在启动之后从内…应用对于Android系统来说至关重要系统会有几个时机对APP进行解析一个是APK安装的时候会进行解析还有一个就是系统在重启之后会进行解析这里就简单的记录一下重启的时候APK的解析过程。
一、SystemServer
系统在启动之后从内核层启动第一个用户控件Init进程再通过Init进程启动系统中第一个java 进程zygote随之zygote fock出SystemServerSystemServer再开始启动一些列系统服务其中就包括PackageMangerService在startBootstrapServices函数中
public final void startBootstrapServices(TimingsTraceAndSlog timingsTraceAndSlog) {
.....// 先调用了PackageManagerService的main函数PairPackageManagerService, IPackageManager main PackageManagerService.main(context, installer, domainVerificationService, z, this.mOnlyCore);// main 函数创建了PackageManagerService 和IPackageManager 的实例this.mPackageManagerService (PackageManagerService) main.first;IPackageManager iPackageManager (IPackageManager) main.second;Watchdog.getInstance().resumeWatchingCurrentThread(packagemanagermain);// 该方法将在 BaseDexClassLoader 中安装一个报告器同时还将强制报告系统服务器已加载的任何 dex 文件SystemServerDexLoadReporter.configureSystemServerDexReporter(iPackageManager);this.mFirstBoot this.mPackageManagerService.isFirstBoot();this.mPackageManager this.mSystemContext.getPackageManager();二、PackageManagerService
在SystemServer中是先调用PackageManagerService的main函数来初始化它自己的来看看它做了什么
public static PairPackageManagerService, IPackageManager main(Context context,Installer installer, NonNull DomainVerificationService domainVerificationService,boolean factoryTest, boolean onlyCore) {PackageManagerServiceCompilerMapping.checkProperties();final TimingsTraceAndSlog t new TimingsTraceAndSlog(TAG Timing,Trace.TRACE_TAG_PACKAGE_MANAGER);t.traceBegin(create package manager);final PackageManagerTracedLock lock new PackageManagerTracedLock();final Object installLock new Object();// 创建自带handler的线程HandlerThread backgroundThread new ServiceThread(PackageManagerBg,Process.THREAD_PRIORITY_BACKGROUND, true /*allowIo*/);backgroundThread.start();Handler backgroundHandler new Handler(backgroundThread.getLooper());// 创建PackageManagerServiceInjector 用来持有管理其他一系列重要的类实例PackageManagerServiceInjector injector new PackageManagerServiceInjector(context, lock, installer, installLock, new PackageAbiHelperImpl(),backgroundHandler,SYSTEM_PARTITIONS,// 解析compnent的(i, pm) - new ComponentResolver(i.getUserManagerService(), pm.mUserNeedsBadging),// 权限管理服务(i, pm) - PermissionManagerService.create(context,i.getSystemConfig().getAvailableFeatures()),// 用户管理服务(i, pm) - new UserManagerService(context, pm,new UserDataPreparer(installer, installLock, context, onlyCore),lock),// 系统数据库用来访问系统数据库的(i, pm) - new Settings(Environment.getDataDirectory(),RuntimePermissionsPersistence.createInstance(),i.getPermissionManagerServiceInternal(),domainVerificationService, backgroundHandler, lock),(i, pm) - AppsFilterImpl.create(i,i.getLocalService(PackageManagerInternal.class)),// compat服务用来管理一些系统特性(i, pm) - (PlatformCompat) ServiceManager.getService(platform_compat),// 系统配置服务预置的系统的权限、硬件feature还有其他的一些配置在这里面解析(i, pm) - SystemConfig.getInstance(),// 在软件包上运行 dexopt 命令的辅助类。(i, pm) - new PackageDexOptimizer(i.getInstaller(), i.getInstallLock(),i.getContext(), *dexopt*),// dex 行为管理类会保存所有包的dex位置(i, pm) - new DexManager(i.getContext(), i.getPackageDexOptimizer(),i.getInstaller(), i.getInstallLock()),(i, pm) - new ArtManagerService(i.getContext(), i.getInstaller(),i.getInstallLock()),(i, pm) - ApexManager.getInstance(),(i, pm) - new ViewCompiler(i.getInstallLock(), i.getInstaller()),(i, pm) - (IncrementalManager)i.getContext().getSystemService(Context.INCREMENTAL_SERVICE),(i, pm) - new DefaultAppProvider(() - context.getSystemService(RoleManager.class),() - LocalServices.getService(UserManagerInternal.class)),(i, pm) - new DisplayMetrics(),// 包解析类(i, pm) - new PackageParser2(pm.mSeparateProcesses, pm.mOnlyCore,i.getDisplayMetrics(), pm.mCacheDir,pm.mPackageParserCallback) /* scanningCachingPackageParserProducer */,(i, pm) - new PackageParser2(pm.mSeparateProcesses, pm.mOnlyCore,i.getDisplayMetrics(), null,pm.mPackageParserCallback) /* scanningPackageParserProducer */,(i, pm) - new PackageParser2(pm.mSeparateProcesses, false, i.getDisplayMetrics(),null, pm.mPackageParserCallback) /* preparingPackageParserProducer */,// Prepare a supplier of package parser for the staging manager to parse apex file// during the staging installation.// 包安装服务(i, pm) - new PackageInstallerService(i.getContext(), pm, i::getScanningPackageParser),(i, pm, cn) - new InstantAppResolverConnection(i.getContext(), cn, Intent.ACTION_RESOLVE_INSTANT_APP_PACKAGE),(i, pm) - new ModuleInfoProvider(i.getContext()),(i, pm) - LegacyPermissionManagerService.create(i.getContext()),(i, pm) - domainVerificationService,(i, pm) - {HandlerThread thread new ServiceThread(TAG,Process.THREAD_PRIORITY_DEFAULT, true /*allowIo*/);thread.start();return new PackageHandler(thread.getLooper(), pm);},new DefaultSystemWrapper(),LocalServices::getService,context::getSystemService,(i, pm) - new BackgroundDexOptService(i.getContext(), i.getDexManager(), pm),(i, pm) - IBackupManager.Stub.asInterface(ServiceManager.getService(Context.BACKUP_SERVICE)),(i, pm) - new SharedLibrariesImpl(pm, i));if (Build.VERSION.SDK_INT 0) {Slog.w(TAG, **** ro.build.version.sdk not set!);}// 初始化PackageManagerServicePackageManagerService m new PackageManagerService(injector, onlyCore, factoryTest, PackagePartitions.FINGERPRINT, Build.IS_ENG, Build.IS_USERDEBUG, Build.VERSION.SDK_INT, Build.VERSION.INCREMENTAL);t.traceEnd(); // create package managerfinal CompatChange.ChangeListener selinuxChangeListener packageName - {synchronized (m.mInstallLock) {final Computer snapshot m.snapshotComputer();final PackageStateInternal packageState snapshot.getPackageStateInternal(packageName);if (packageState null) {Slog.e(TAG, Failed to find package setting packageName);return;}AndroidPackage pkg packageState.getPkg();SharedUserApi sharedUser snapshot.getSharedUser(packageState.getSharedUserAppId());String oldSeInfo AndroidPackageUtils.getSeInfo(pkg, packageState);if (pkg null) {Slog.e(TAG, Failed to find package packageName);return;}final String newSeInfo SELinuxMMAC.getSeInfo(pkg, sharedUser,m.mInjector.getCompatibility());if (!newSeInfo.equals(oldSeInfo)) {Slog.i(TAG, Updating seInfo for package packageName from: oldSeInfo to: newSeInfo);m.commitPackageStateMutation(null, packageName,state - state.setOverrideSeInfo(newSeInfo));m.mAppDataHelper.prepareAppDataAfterInstallLIF(pkg);}}};//监听selinux的一些变化injector.getCompatibility().registerListener(SELinuxMMAC.SELINUX_LATEST_CHANGES,selinuxChangeListener);injector.getCompatibility().registerListener(SELinuxMMAC.SELINUX_R_CHANGES,selinuxChangeListener);// ota完或者第一次开机为所有用户安装其被m.installAllowlistedSystemPackages();// 初始化 IPackageManagerImpl IPackageManagerImpl iPackageManager m.new IPackageManagerImpl();ServiceManager.addService(package, iPackageManager);// 初始化PackageManagerNative final PackageManagerNative pmn new PackageManagerNative(m);ServiceManager.addService(package_native, pmn);LocalManagerRegistry.addManager(PackageManagerLocal.class, m.new PackageManagerLocalImpl());return Pair.create(m, iPackageManager);}简单的介绍了一下main下面重头戏在PackageManagerService的初始化过程它总共有两个构造函数注意一个只做了赋值我们这里调用的不是这个构造函数而是另一个
public PackageManagerService(PackageManagerServiceInjector injector, boolean onlyCore,boolean factoryTest, final String buildFingerprint, final boolean isEngBuild,final boolean isUserDebugBuild, final int sdkVersion, final String incrementalVersion) {mIsEngBuild isEngBuild;......// 这里部分主要是给PackageMangerService的一些属性赋值......// CHECKSTYLE:ON IndentationCheckt.traceEnd();t.traceBegin(addSharedUsers);// 注册各种UIDmSettings.addSharedUserLPw(android.uid.system, Process.SYSTEM_UID,ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);mSettings.addSharedUserLPw(android.uid.phone, RADIO_UID,ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);mSettings.addSharedUserLPw(android.uid.log, LOG_UID,ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);mSettings.addSharedUserLPw(android.uid.nfc, NFC_UID,ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);mSettings.addSharedUserLPw(android.uid.bluetooth, BLUETOOTH_UID,ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);mSettings.addSharedUserLPw(android.uid.shell, SHELL_UID,ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);mSettings.addSharedUserLPw(android.uid.se, SE_UID,ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);mSettings.addSharedUserLPw(android.uid.networkstack, NETWORKSTACK_UID,ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);mSettings.addSharedUserLPw(android.uid.uwb, UWB_UID,ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);t.traceEnd();......// 又是一堆初始化赋值......// 从systemconfig获取对于机器来说可用的硬件feature可以在这里之前对feature进行修改t.traceBegin(get system config);SystemConfig systemConfig injector.getSystemConfig();mAvailableFeatures systemConfig.getAvailableFeatures();t.traceEnd();......// 这里是读取在mac_permissions.xml下面配置的一些se策略可以有效的限制一些应用的权限SELinuxMMAC.readInstallPolicy();......final VersionInfo ver mSettings.getInternalVersion();// 指纹信息是否有更新mIsUpgrade !buildFingerprint.equals(ver.fingerprint);if (mIsUpgrade) {PackageManagerServiceUtils.logCriticalInfo(Log.INFO, Upgrading from ver.fingerprint to PackagePartitions.FINGERPRINT);}mInitAppsHelper new InitAppsHelper(this, mApexManager, mInstallPackageHelper,mInjector.getSystemPartitions());// when upgrading from pre-M, promote system app permissions from install to runtime// 是否从M升上来mPromoteSystemApps mIsUpgrade ver.sdkVersion Build.VERSION_CODES.LOLLIPOP_MR1;// When upgrading from pre-N, we need to handle package extraction like first boot,// as there is no profiling data available.// 是否从N 升上来mIsPreNUpgrade mIsUpgrade ver.sdkVersion Build.VERSION_CODES.N;// 是否从n mr升上来mIsPreNMR1Upgrade mIsUpgrade ver.sdkVersion Build.VERSION_CODES.N_MR1;// 是否从Q升上来mIsPreQUpgrade mIsUpgrade ver.sdkVersion Build.VERSION_CODES.Q;......// 根据不同的版本类型创建缓存目录如果已存在则不创建mCacheDir PackageManagerServiceUtils.preparePackageParserCache(mIsEngBuild, mIsUserDebugBuild, mIncrementalVersion);final int[] userIds mUserManager.getUserIds();PackageParser2 packageParser mInjector.getScanningCachingPackageParser();// 初始化安装系统级APPmOverlayConfig mInitAppsHelper.initSystemApps(packageParser, packageSettings, userIds,startTime);// 初始化安装非系统级APPmInitAppsHelper.initNonSystemApps(packageParser, userIds, startTime);packageParser.close();......
}可以从上面PackageManagerService的初始化可以看到机器开机的时候安装APP的任务是交给InitAppsHelper这个类来做的两个函数一个initSystemApps一个initNonSystemApps分别是初始化系统app和非系统app两个函数都是对系统中的应用进行安装解析区别就是针对系统app还是非系统app我们先从系统app来看看。
三、InitAppsHelper
public OverlayConfig initSystemApps(PackageParser2 packageParser,WatchedArrayMapString, PackageSetting packageSettings,int[] userIds, long startTime) initSystemApps有四个参数看下其中比较重要的两个参数怎么来的
1、PackageParser2
第一个参数实在PackageManagerService初始化的时候从mInjector获取的而这里的PackageParser2是在PackaManagerService的main函数初始化的
PackageParser2 packageParser mInjector.getScanningCachingPackageParser();2、WatchedArrayMapString, PackageSetting
首先这个参数是通过PackageMangerService的成员变量mSettings获取
final WatchedArrayMapString, PackageSetting packageSettings mSettings.getPackagesLocked();Settings.getPackagesLocked WatchedArrayMapString, PackageSetting getPackagesLocked() {return mPackages;}Settings.addPackageLPw 中添加数据 PackageSetting addPackageLPw(String name, String realName, File codePath, int uid, int pkgFlags,int pkgPrivateFlags, NonNull UUID domainSetId) {PackageSetting p mPackages.get(name);if (p ! null) {if (p.getAppId() uid) {return p;}PackageManagerService.reportSettingsProblem(Log.ERROR,Adding duplicate package, keeping first: name);return null;}p new PackageSetting(name, realName, codePath, pkgFlags, pkgPrivateFlags, domainSetId).setAppId(uid);if (mAppIds.registerExistingAppId(uid, p, name)) {mPackages.put(name, p);return p;}return null;}Settings.readSettingsLPw这个函数中对应用的一些配置信息进行解析这些信息主要是存在/data/system目录下面 boolean readSettingsLPw(NonNull Computer computer, NonNull ListUserInfo users,ArrayMapString, Long originalFirstInstallTimes) {mPendingPackages.clear();mInstallerPackages.clear();originalFirstInstallTimes.clear();ArrayMapLong, Integer keySetRefs new ArrayMap();ArrayListSignature readSignatures new ArrayList();// 获取一系列配置文件文件位于/data/system/下面在setings初始化的时候被赋值/**mSystemDir new File(dataDir, system);mSystemDir.mkdirs();mSettingsFilename new File(mSystemDir, packages.xml);mSettingsReserveCopyFilename new File(mSystemDir, packages.xml.reservecopy);mPreviousSettingsFilename new File(mSystemDir, packages-backup.xml);下面就是对这些配置文件进行解析*/try (ResilientAtomicFile atomicFile getSettingsFile()) {FileInputStream str null;try {str atomicFile.openRead();if (str null) {// Not necessary, but will avoid wtf-s in the finally section.findOrCreateVersion(StorageManager.UUID_PRIVATE_INTERNAL).forceCurrent();findOrCreateVersion(StorageManager.UUID_PRIMARY_PHYSICAL).forceCurrent();return false;}final TypedXmlPullParser parser Xml.resolvePullParser(str);int type;while ((type parser.next()) ! XmlPullParser.START_TAG type ! XmlPullParser.END_DOCUMENT) {// nothing}if (type ! XmlPullParser.START_TAG) {mReadMessages.append(No start tag found in settings file\n);PackageManagerService.reportSettingsProblem(Log.WARN,No start tag found in package manager settings);Slog.wtf(PackageManagerService.TAG,No start tag found in package manager settings);return false;}int outerDepth parser.getDepth();while ((type parser.next()) ! XmlPullParser.END_DOCUMENT (type ! XmlPullParser.END_TAG || parser.getDepth() outerDepth)) {if (type XmlPullParser.END_TAG || type XmlPullParser.TEXT) {continue;}String tagName parser.getName();if (tagName.equals(package)) {//读取包信息readPackageLPw(parser, readSignatures, keySetRefs, users,originalFirstInstallTimes);} else if (tagName.equals(permissions)) {mPermissions.readPermissions(parser);} else if (tagName.equals(permission-trees)) {mPermissions.readPermissionTrees(parser);} else if (tagName.equals(shared-user)) {readSharedUserLPw(parser, readSignatures, users);} else if (tagName.equals(preferred-packages)) {// no longer used.} else if (tagName.equals(preferred-activities)) {// Upgrading from old single-user implementation;// these are the preferred activities for user 0.readPreferredActivitiesLPw(parser, 0);} else if (tagName.equals(TAG_PERSISTENT_PREFERRED_ACTIVITIES)) {// TODO: check whether this is okay! as it is very// similar to how preferred-activities are treatedreadPersistentPreferredActivitiesLPw(parser, 0);} else if (tagName.equals(TAG_CROSS_PROFILE_INTENT_FILTERS)) {// TODO: check whether this is okay! as it is very// similar to how preferred-activities are treatedreadCrossProfileIntentFiltersLPw(parser, 0);} else if (tagName.equals(TAG_DEFAULT_BROWSER)) {readDefaultAppsLPw(parser, 0);} else if (tagName.equals(updated-package)) {readDisabledSysPackageLPw(parser, users);} else if (tagName.equals(renamed-package)) {String nname parser.getAttributeValue(null, new);String oname parser.getAttributeValue(null, old);if (nname ! null oname ! null) {mRenamedPackages.put(nname, oname);}} else if (tagName.equals(last-platform-version)) {// Upgrade from older XML schemafinal VersionInfo internal findOrCreateVersion(StorageManager.UUID_PRIVATE_INTERNAL);final VersionInfo external findOrCreateVersion(StorageManager.UUID_PRIMARY_PHYSICAL);internal.sdkVersion parser.getAttributeInt(null, internal, 0);external.sdkVersion parser.getAttributeInt(null, external, 0);internal.buildFingerprint external.buildFingerprint XmlUtils.readStringAttribute(parser, buildFingerprint);internal.fingerprint external.fingerprint XmlUtils.readStringAttribute(parser, fingerprint);} else if (tagName.equals(database-version)) {// Upgrade from older XML schemafinal VersionInfo internal findOrCreateVersion(StorageManager.UUID_PRIVATE_INTERNAL);final VersionInfo external findOrCreateVersion(StorageManager.UUID_PRIMARY_PHYSICAL);internal.databaseVersion parser.getAttributeInt(null, internal, 0);external.databaseVersion parser.getAttributeInt(null, external, 0);} else if (tagName.equals(verifier)) {final String deviceIdentity parser.getAttributeValue(null, device);mVerifierDeviceIdentity VerifierDeviceIdentity.parse(deviceIdentity);} else if (TAG_READ_EXTERNAL_STORAGE.equals(tagName)) {// No longer used.} else if (tagName.equals(keyset-settings)) {mKeySetManagerService.readKeySetsLPw(parser, keySetRefs);} else if (TAG_VERSION.equals(tagName)) {final String volumeUuid XmlUtils.readStringAttribute(parser,ATTR_VOLUME_UUID);final VersionInfo ver findOrCreateVersion(volumeUuid);ver.sdkVersion parser.getAttributeInt(null, ATTR_SDK_VERSION);ver.databaseVersion parser.getAttributeInt(null, ATTR_DATABASE_VERSION);ver.buildFingerprint XmlUtils.readStringAttribute(parser,ATTR_BUILD_FINGERPRINT);ver.fingerprint XmlUtils.readStringAttribute(parser, ATTR_FINGERPRINT);} else if (tagName.equals(DomainVerificationPersistence.TAG_DOMAIN_VERIFICATIONS)) {mDomainVerificationManager.readSettings(computer, parser);} else if (tagName.equals(DomainVerificationLegacySettings.TAG_DOMAIN_VERIFICATIONS_LEGACY)) {mDomainVerificationManager.readLegacySettings(parser);} else {Slog.w(PackageManagerService.TAG, Unknown element under packages: parser.getName());XmlUtils.skipCurrentTag(parser);}}str.close();} catch (IOException | XmlPullParserException | ArrayIndexOutOfBoundsException e) {// Remove corrupted file and retry.atomicFile.failRead(str, e);// Ignore the result to not mark this as a first boot.readSettingsLPw(computer, users, originalFirstInstallTimes);}}return true;}从上面的函数可以看出Settings这个类的主要职责就是存储修改解析应用的配置信息这里涉及的东西比较多不再赘述有兴趣可以自行查阅相关源码。 mFirstBoot !mSettings.readLPw(computer,mInjector.getUserManagerInternal().getUsers(/* excludePartial */ true,/* excludeDying */ false,/* excludePreCreated */ false));这里是Settings解析的开始在PackageMangerService的构造函数中这是第二个参数的由来接着第三个四个参数就比较简单分别是uid和时间戳。
篇幅有限下一篇展开细说
