开篇核心源码关键类路径SystemServer.javaframeworks/base/services/java/com/android/server/SystemServer.javaPackageManagerService.javaframeworks/base/services/core/java/com/android/server/pm/PackageManagerService.javaProcess.javaframeworks/base/core/java/android/os/Process.javaSystemConfig.javaframeworks/base/core/java/com/android/server/SystemConfig.javaSettings.javaframeworks/base/services/core/java/com/android/server/pm/Settings.java简介PackageManagerService（PMS）是 SystemServer 启动后的第一个核心服务，也是 Android 系统中最常用的服务之一。它负责系统中 Package 的管理，应用程序的安装、卸载、信息查询等。如果你是面向 Android 系统开发的工程师，基础概念我也不需要再多赘述，我们直接跟源码。PackageParserparseMonolithicPackageLite private static PackageLite parseMonolithicPackageLite(File packageFile, int flags) throws PackageParserException { final ApkLite baseApk = parseApkLite(packageFile, flags); final String packagePath = packageFile.getAbsolutePath(); return new PackageLite(packagePath, baseApk, null, null, null, null, null, null); }这个方法就是调用parseApkLite()方法来获取一个ApkLite对象，然后用这个ApkLite对象构造一个PackageLite对象。parseApkLite-01 /** * Utility method that retrieves lightweight details about a single APK * file, including package name, split name, and install location. * * @param apkFile path to a single APK * @param flags optional parse flags, such as * {@link #PARSE_COLLECT_CERTIFICATES} / public static ApkLite parseApkLite(File apkFile, int flags) throws PackageParserException { final String apkPath = apkFile.getAbsolutePath(); // 创建 AssetManager 对象 AssetManager assets = null; XmlResourceParser parser = null; try { assets = newConfiguredAssetManager(); int cookie = assets.addAssetPath(apkPath); if (cookie == 0) { throw new PackageParserException(INSTALL_PARSE_FAILED_NOT_APK, “Failed to parse " + apkPath); } final DisplayMetrics metrics = new DisplayMetrics(); metrics.setToDefaults(); parser = assets.openXmlResourceParser(cookie, ANDROID_MANIFEST_FILENAME); final Signature[] signatures; final Certificate[][] certificates; // 设置签名 if ((flags & PARSE_COLLECT_CERTIFICATES) != 0) { // TODO: factor signature related items out of Package object final Package tempPkg = new Package((String) null); Trace.traceBegin(TRACE_TAG_PACKAGE_MANAGER, “collectCertificates”); try { collectCertificates(tempPkg, apkFile, flags); } finally { Trace.traceEnd(TRACE_TAG_PACKAGE_MANAGER); } signatures = tempPkg.mSignatures; certificates = tempPkg.mCertificates; } else { signatures = null; certificates = null; } final AttributeSet attrs = parser; return parseApkLite(apkPath, parser, attrs, signatures, certificates); } catch (XmlPullParserException | IOException | RuntimeException e) { Slog.w(TAG, “Failed to parse " + apkPath, e); throw new PackageParserException(INSTALL_PARSE_FAILED_UNEXPECTED_EXCEPTION, “Failed to parse " + apkPath, e); } finally { // 关闭资源管理器与解析器 IoUtils.closeQuietly(parser); IoUtils.closeQuietly(assets); } }parseApkLite-02 private static ApkLite parseApkLite(String codePath, XmlPullParser parser, AttributeSet attrs, Signature[] signatures, Certificate[][] certificates) throws IOException, XmlPullParserException, PackageParserException { // 调用了parsePackageSplitNames()方法来获取packageSplit final Pair<String, String> packageSplit = parsePackageSplitNames(parser, attrs); int installLocation = PARSE_DEFAULT_INSTALL_LOCATION; int versionCode = 0; int revisionCode = 0; boolean coreApp = false; boolean debuggable = false; boolean multiArch = false; boolean use32bitAbi = false; boolean extractNativeLibs = true; boolean isolatedSplits = false; boolean isFeatureSplit = false; String configForSplit = null; String usesSplitName = null; // 遍历属性，并获取相应的值 for (int i = 0; i < attrs.getAttributeCount(); i++) { final String attr = attrs.getAttributeName(i); if (attr.equals(“installLocation”)) { installLocation = attrs.getAttributeIntValue(i, PARSE_DEFAULT_INSTALL_LOCATION); } else if (attr.equals(“versionCode”)) { versionCode = attrs.getAttributeIntValue(i, 0); } else if (attr.equals(“revisionCode”)) { revisionCode = attrs.getAttributeIntValue(i, 0); } else if (attr.equals(“coreApp”)) { coreApp = attrs.getAttributeBooleanValue(i, false); } else if (attr.equals(“isolatedSplits”)) { isolatedSplits = attrs.getAttributeBooleanValue(i, false); } else if (attr.equals(“configForSplit”)) { configForSplit = attrs.getAttributeValue(i); } else if (attr.equals(“isFeatureSplit”)) { isFeatureSplit = attrs.getAttributeBooleanValue(i, false); } } // Only search the tree when the tag is directly below <manifest> int type; final int searchDepth = parser.getDepth() + 1; final List<VerifierInfo> verifiers = new ArrayList<VerifierInfo>(); // private static final String TAG_PACKAGE_VERIFIER = “package-verifier” // 继续解析package-verifier节点 while ((type = parser.next()) != XmlPullParser.END_DOCUMENT && (type != XmlPullParser.END_TAG || parser.getDepth() >= searchDepth)) { if (type == XmlPullParser.END_TAG || type == XmlPullParser.TEXT) { continue; } if (parser.getDepth() != searchDepth) { continue; } if (TAG_PACKAGE_VERIFIER.equals(parser.getName())) { final VerifierInfo verifier = parseVerifier(attrs); if (verifier != null) { verifiers.add(verifier); } } else if (TAG_APPLICATION.equals(parser.getName())) { for (int i = 0; i < attrs.getAttributeCount(); ++i) { final String attr = attrs.getAttributeName(i); if (“debuggable”.equals(attr)) { debuggable = attrs.getAttributeBooleanValue(i, false); } if (“multiArch”.equals(attr)) { multiArch = attrs.getAttributeBooleanValue(i, false); } if (“use32bitAbi”.equals(attr)) { use32bitAbi = attrs.getAttributeBooleanValue(i, false); } if (“extractNativeLibs”.equals(attr)) { extractNativeLibs = attrs.getAttributeBooleanValue(i, true); } } } else if (TAG_USES_SPLIT.equals(parser.getName())) { if (usesSplitName != null) { Slog.w(TAG, “Only one <uses-split> permitted. Ignoring others.”); continue; } usesSplitName = attrs.getAttributeValue(ANDROID_RESOURCES, “name”); if (usesSplitName == null) { throw new PackageParserException( PackageManager.INSTALL_PARSE_FAILED_MANIFEST_MALFORMED, “<uses-split> tag requires ‘android:name’ attribute”); } } } //利用解析出来的数据去构造一个ApkLite对象 return new ApkLite(codePath, packageSplit.first, packageSplit.second, isFeatureSplit, configForSplit, usesSplitName, versionCode, revisionCode, installLocation, verifiers, signatures, certificates, coreApp, debuggable, multiArch, use32bitAbi, extractNativeLibs, isolatedSplits); }parsePackageSplitNames// 这个方法主要是解析manifest private static Pair<String, String> parsePackageSplitNames(XmlPullParser parser, AttributeSet attrs) throws IOException, XmlPullParserException, PackageParserException { int type; while ((type = parser.next()) != XmlPullParser.START_TAG && type != XmlPullParser.END_DOCUMENT) { } if (type != XmlPullParser.START_TAG) { throw new PackageParserException(INSTALL_PARSE_FAILED_MANIFEST_MALFORMED, “No start tag found”); } if (!parser.getName().equals(TAG_MANIFEST)) { throw new PackageParserException(INSTALL_PARSE_FAILED_MANIFEST_MALFORMED, “No <manifest> tag”); } final String packageName = attrs.getAttributeValue(null, “package”); if (!“android”.equals(packageName)) { // 这个方法主要就是检测是否是数字、字母、下划线和点分隔符，这也是取包名的规则， // 比如是字母数字下划线加点分隔符，否则都不是合法的应用包名。并且合法的包名至少包含一个点分隔符。 final String error = validateName(packageName, true, true); if (error != null) { throw new PackageParserException(INSTALL_PARSE_FAILED_BAD_PACKAGE_NAME, “Invalid manifest package: " + error); } } String splitName = attrs.getAttributeValue(null, “split”); if (splitName != null) { if (splitName.length() == 0) { splitName = null; } else { final String error = validateName(splitName, false, false); if (error != null) { throw new PackageParserException(INSTALL_PARSE_FAILED_BAD_PACKAGE_NAME, “Invalid manifest split: " + error); } } } return Pair.create(packageName.intern(), (splitName != null) ? splitName.intern() : splitName); }parseBaseApk private Package parseBaseApk(File apkFile, AssetManager assets, int flags) throws PackageParserException { final String apkPath = apkFile.getAbsolutePath(); String volumeUuid = null; if (apkPath.startsWith(MNT_EXPAND)) { final int end = apkPath.indexOf(’/’, MNT_EXPAND.length()); volumeUuid = apkPath.substring(MNT_EXPAND.length(), end); } mParseError = PackageManager.INSTALL_SUCCEEDED; mArchiveSourcePath = apkFile.getAbsolutePath(); if (DEBUG_JAR) Slog.d(TAG, “Scanning base APK: " + apkPath); final int cookie = loadApkIntoAssetManager(assets, apkPath, flags); Resources res = null; XmlResourceParser parser = null; try { res = new Resources(assets, mMetrics, null); parser = assets.openXmlResourceParser(cookie, ANDROID_MANIFEST_FILENAME); final String[] outError = new String[1]; final Package pkg = parseBaseApk(apkPath, res, parser, flags, outError); if (pkg == null) { throw new PackageParserException(mParseError, apkPath + " (at " + parser.getPositionDescription() + “): " + outError[0]); } pkg.setVolumeUuid(volumeUuid); pkg.setApplicationVolumeUuid(volumeUuid); pkg.setBaseCodePath(apkPath); pkg.setSignatures(null); return pkg; } catch (PackageParserException e) { throw e; } catch (Exception e) { throw new PackageParserException(INSTALL_PARSE_FAILED_UNEXPECTED_EXCEPTION, “Failed to read manifest from " + apkPath, e); } finally { IoUtils.closeQuietly(parser); } }parseBaseApk private Package parseBaseApk(String apkPath, Resources res, XmlResourceParser parser, int flags, String[] outError) throws XmlPullParserException, IOException { final String splitName; final String pkgName; try { Pair<String, String> packageSplit = parsePackageSplitNames(parser, parser); pkgName = packageSplit.first; splitName = packageSplit.second; if (!TextUtils.isEmpty(splitName)) { outError[0] = “Expected base APK, but found split " + splitName; mParseError = PackageManager.INSTALL_PARSE_FAILED_BAD_PACKAGE_NAME; return null; } } catch (PackageParserException e) { mParseError = PackageManager.INSTALL_PARSE_FAILED_BAD_PACKAGE_NAME; return null; } if (mCallback != null) { String[] overlayPaths = mCallback.getOverlayPaths(pkgName, apkPath); if (overlayPaths != null && overlayPaths.length > 0) { for (String overlayPath : overlayPaths) { res.getAssets().addOverlayPath(overlayPath); } } } // 用包名构造一个Package final Package pkg = new Package(pkgName); // 获取资源数组 TypedArray sa = res.obtainAttributes(parser, com.android.internal.R.styleable.AndroidManifest); // 初始化pkg的属性mVersionCode、baseRevisionCode和mVersionName pkg.mVersionCode = pkg.applicationInfo.versionCode = sa.getInteger( com.android.internal.R.styleable.AndroidManifest_versionCode, 0); pkg.baseRevisionCode = sa.getInteger( com.android.internal.R.styleable.AndroidManifest_revisionCode, 0); pkg.mVersionName = sa.getNonConfigurationString( com.android.internal.R.styleable.AndroidManifest_versionName, 0); if (pkg.mVersionName != null) { pkg.mVersionName = pkg.mVersionName.intern(); } // 判断是不是核心app pkg.coreApp = parser.getAttributeBooleanValue(null, “coreApp”, false); sa.recycle(); // 解析AndroidManifest下面的每一个节点 return parseBaseApkCommon(pkg, null, res, parser, flags, outError); }parseBaseApkCommon private Package parseBaseApkCommon(Package pkg, Set<String> acceptedTags, Resources res, XmlResourceParser parser, int flags, String[] outError) throws XmlPullParserException, IOException { … … / Set the global “forward lock” flag / if ((flags & PARSE_FORWARD_LOCK) != 0) { pkg.applicationInfo.privateFlags |= ApplicationInfo.PRIVATE_FLAG_FORWARD_LOCK; } / Set the global “on SD card” flag / // 是否要安装在SD卡上 if ((flags & PARSE_EXTERNAL_STORAGE) != 0) { pkg.applicationInfo.flags |= ApplicationInfo.FLAG_EXTERNAL_STORAGE; } // Resource boolean are -1, so 1 means we don’t know the value. int supportsSmallScreens = 1; int supportsNormalScreens = 1; int supportsLargeScreens = 1; int supportsXLargeScreens = 1; int resizeable = 1; int anyDensity = 1; 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; } … … // 解析<application> 标签 if (tagName.equals(TAG_APPLICATION)) { if (foundApp) { if (RIGID_PARSER) { outError[0] = “<manifest> has more than one <application>”; mParseError = PackageManager.INSTALL_PARSE_FAILED_MANIFEST_MALFORMED; return null; } else { Slog.w(TAG, “<manifest> has more than one <application>”); XmlUtils.skipCurrentTag(parser); continue; } } foundApp = true; if (!parseBaseApplication(pkg, res, parser, flags, outError)) { return null; } // 解析<overlay> 标签 } else if (tagName.equals(TAG_OVERLAY)) { sa = res.obtainAttributes(parser, com.android.internal.R.styleable.AndroidManifestResourceOverlay); pkg.mOverlayTarget = sa.getString( com.android.internal.R.styleable.AndroidManifestResourceOverlay_targetPackage); pkg.mOverlayPriority = sa.getInt( com.android.internal.R.styleable.AndroidManifestResourceOverlay_priority, 0); pkg.mIsStaticOverlay = sa.getBoolean( com.android.internal.R.styleable.AndroidManifestResourceOverlay_isStatic, false); final String propName = sa.getString( com.android.internal.R.styleable .AndroidManifestResourceOverlay_requiredSystemPropertyName); final String propValue = sa.getString( com.android.internal.R.styleable .AndroidManifestResourceOverlay_requiredSystemPropertyValue); sa.recycle(); if (pkg.mOverlayTarget == null) { outError[0] = “<overlay> does not specify a target package”; mParseError = PackageManager.INSTALL_PARSE_FAILED_MANIFEST_MALFORMED; return null; } if (pkg.mOverlayPriority < 0 || pkg.mOverlayPriority > 9999) { outError[0] = “<overlay> priority must be between 0 and 9999”; mParseError = PackageManager.INSTALL_PARSE_FAILED_MANIFEST_MALFORMED; return null; } // check to see if overlay should be excluded based on system property condition if (!checkOverlayRequiredSystemProperty(propName, propValue)) { Slog.i(TAG, “Skipping target and overlay pair " + pkg.mOverlayTarget + " and " + pkg.baseCodePath+ “: overlay ignored due to required system property: " + propName + " with value: " + propValue); return null; } XmlUtils.skipCurrentTag(parser); // 解析<key-sets> 标签 } else if (tagName.equals(TAG_KEY_SETS)) { if (!parseKeySets(pkg, res, parser, outError)) { return null; } // 解析<permission-group> 标签 } else if (tagName.equals(TAG_PERMISSION_GROUP)) { if (!parsePermissionGroup(pkg, flags, res, parser, outError)) { return null; } // 解析<permission> 标签 } else if (tagName.equals(TAG_PERMISSION)) { if (!parsePermission(pkg, res, parser, outError)) { return null; } // 解析<permission-tree> 标签 } else if (tagName.equals(TAG_PERMISSION_TREE)) { if (!parsePermissionTree(pkg, res, parser, outError)) { return null; } // 解析<uses-permission> 标签 } else if (tagName.equals(TAG_USES_PERMISSION)) { if (!parseUsesPermission(pkg, res, parser)) { return null; } // 解析<uses-permission-sdk-m> 标签或者 <uses-permission-sdk-23> 标签 } else if (tagName.equals(TAG_USES_PERMISSION_SDK_M) || tagName.equals(TAG_USES_PERMISSION_SDK_23)) { if (!parseUsesPermission(pkg, res, parser)) { return null; } // 解析<uses-configuration>标签 } else if (tagName.equals(TAG_USES_CONFIGURATION)) { ConfigurationInfo cPref = new ConfigurationInfo(); sa = res.obtainAttributes(parser, com.android.internal.R.styleable.AndroidManifestUsesConfiguration); cPref.reqTouchScreen = sa.getInt( com.android.internal.R.styleable.AndroidManifestUsesConfiguration_reqTouchScreen, Configuration.TOUCHSCREEN_UNDEFINED); cPref.reqKeyboardType = sa.getInt( com.android.internal.R.styleable.AndroidManifestUsesConfiguration_reqKeyboardType, Configuration.KEYBOARD_UNDEFINED); if (sa.getBoolean( com.android.internal.R.styleable.AndroidManifestUsesConfiguration_reqHardKeyboard, false)) { cPref.reqInputFeatures |= ConfigurationInfo.INPUT_FEATURE_HARD_KEYBOARD; } cPref.reqNavigation = sa.getInt( com.android.internal.R.styleable.AndroidManifestUsesConfiguration_reqNavigation, Configuration.NAVIGATION_UNDEFINED); if (sa.getBoolean( com.android.internal.R.styleable.AndroidManifestUsesConfiguration_reqFiveWayNav, false)) { cPref.reqInputFeatures |= ConfigurationInfo.INPUT_FEATURE_FIVE_WAY_NAV; } sa.recycle(); pkg.configPreferences = ArrayUtils.add(pkg.configPreferences, cPref); XmlUtils.skipCurrentTag(parser); // 解析<uses-feature>标签 } else if (tagName.equals(TAG_USES_FEATURE)) { FeatureInfo fi = parseUsesFeature(res, parser); pkg.reqFeatures = ArrayUtils.add(pkg.reqFeatures, fi); if (fi.name == null) { ConfigurationInfo cPref = new ConfigurationInfo(); cPref.reqGlEsVersion = fi.reqGlEsVersion; pkg.configPreferences = ArrayUtils.add(pkg.configPreferences, cPref); } XmlUtils.skipCurrentTag(parser); // 解析<feature-group>标签 } else if (tagName.equals(TAG_FEATURE_GROUP)) { FeatureGroupInfo group = new FeatureGroupInfo(); ArrayList<FeatureInfo> features = null; final int innerDepth = parser.getDepth(); while ((type = parser.next()) != XmlPullParser.END_DOCUMENT && (type != XmlPullParser.END_TAG || parser.getDepth() > innerDepth)) { if (type == XmlPullParser.END_TAG || type == XmlPullParser.TEXT) { continue; } final String innerTagName = parser.getName(); if (innerTagName.equals(“uses-feature”)) { FeatureInfo featureInfo = parseUsesFeature(res, parser); // FeatureGroups are stricter and mandate that // any <uses-feature> declared are mandatory. featureInfo.flags |= FeatureInfo.FLAG_REQUIRED; features = ArrayUtils.add(features, featureInfo); } else { Slog.w(TAG, “Unknown element under <feature-group>: " + innerTagName + " at " + mArchiveSourcePath + " " + parser.getPositionDescription()); } XmlUtils.skipCurrentTag(parser); } if (features != null) { group.features = new FeatureInfo[features.size()]; group.features = features.toArray(group.features); } pkg.featureGroups = ArrayUtils.add(pkg.featureGroups, group); // 解析<uses-sdk>标签 } else if (tagName.equals(TAG_USES_SDK)) { if (SDK_VERSION > 0) { sa = res.obtainAttributes(parser, com.android.internal.R.styleable.AndroidManifestUsesSdk); int minVers = 1; String minCode = null; int targetVers = 0; String targetCode = null; TypedValue val = sa.peekValue( com.android.internal.R.styleable.AndroidManifestUsesSdk_minSdkVersion); if (val != null) { if (val.type == TypedValue.TYPE_STRING && val.string != null) { targetCode = minCode = val.string.toString(); } else { // If it’s not a string, it’s an integer. targetVers = minVers = val.data; } } val = sa.peekValue( com.android.internal.R.styleable.AndroidManifestUsesSdk_targetSdkVersion); if (val != null) { if (val.type == TypedValue.TYPE_STRING && val.string != null) { targetCode = val.string.toString(); if (minCode == null) { minCode = targetCode; } } else { // If it’s not a string, it’s an integer. targetVers = val.data; } } sa.recycle(); final int minSdkVersion = PackageParser.computeMinSdkVersion(minVers, minCode, SDK_VERSION, SDK_CODENAMES, outError); if (minSdkVersion < 0) { mParseError = PackageManager.INSTALL_FAILED_OLDER_SDK; return null; } final int targetSdkVersion = PackageParser.computeTargetSdkVersion(targetVers, targetCode, SDK_VERSION, SDK_CODENAMES, outError); if (targetSdkVersion < 0) { mParseError = PackageManager.INSTALL_FAILED_OLDER_SDK; return null; } pkg.applicationInfo.minSdkVersion = minSdkVersion; pkg.applicationInfo.targetSdkVersion = targetSdkVersion; } XmlUtils.skipCurrentTag(parser); // 解析<supports-screens>标签 } else if (tagName.equals(TAG_SUPPORT_SCREENS)) { sa = res.obtainAttributes(parser, com.android.internal.R.styleable.AndroidManifestSupportsScreens); pkg.applicationInfo.requiresSmallestWidthDp = sa.getInteger( com.android.internal.R.styleable.AndroidManifestSupportsScreens_requiresSmallestWidthDp, 0); pkg.applicationInfo.compatibleWidthLimitDp = sa.getInteger( com.android.internal.R.styleable.AndroidManifestSupportsScreens_compatibleWidthLimitDp, 0); pkg.applicationInfo.largestWidthLimitDp = sa.getInteger( com.android.internal.R.styleable.AndroidManifestSupportsScreens_largestWidthLimitDp, 0); // This is a trick to get a boolean and still able to detect // if a value was actually set. supportsSmallScreens = sa.getInteger( com.android.internal.R.styleable.AndroidManifestSupportsScreens_smallScreens, supportsSmallScreens); supportsNormalScreens = sa.getInteger( com.android.internal.R.styleable.AndroidManifestSupportsScreens_normalScreens, supportsNormalScreens); supportsLargeScreens = sa.getInteger( com.android.internal.R.styleable.AndroidManifestSupportsScreens_largeScreens, supportsLargeScreens); supportsXLargeScreens = sa.getInteger( com.android.internal.R.styleable.AndroidManifestSupportsScreens_xlargeScreens, supportsXLargeScreens); resizeable = sa.getInteger( com.android.internal.R.styleable.AndroidManifestSupportsScreens_resizeable, resizeable); anyDensity = sa.getInteger( com.android.internal.R.styleable.AndroidManifestSupportsScreens_anyDensity, anyDensity); sa.recycle(); XmlUtils.skipCurrentTag(parser); // 解析<protected-broadcast>标签 } else if (tagName.equals(TAG_PROTECTED_BROADCAST)) { sa = res.obtainAttributes(parser, com.android.internal.R.styleable.AndroidManifestProtectedBroadcast); // Note: don’t allow this value to be a reference to a resource // that may change. String name = sa.getNonResourceString( com.android.internal.R.styleable.AndroidManifestProtectedBroadcast_name); sa.recycle(); if (name != null && (flags&PARSE_IS_SYSTEM) != 0) { if (pkg.protectedBroadcasts == null) { pkg.protectedBroadcasts = new ArrayList<String>(); } if (!pkg.protectedBroadcasts.contains(name)) { pkg.protectedBroadcasts.add(name.intern()); } } XmlUtils.skipCurrentTag(parser); // 解析<instrumentation>标签 } else if (tagName.equals(TAG_INSTRUMENTATION)) { if (parseInstrumentation(pkg, res, parser, outError) == null) { return null; } // 解析<original-package>标签 } else if (tagName.equals(TAG_ORIGINAL_PACKAGE)) { sa = res.obtainAttributes(parser, com.android.internal.R.styleable.AndroidManifestOriginalPackage); String orig =sa.getNonConfigurationString( com.android.internal.R.styleable.AndroidManifestOriginalPackage_name, 0); if (!pkg.packageName.equals(orig)) { if (pkg.mOriginalPackages == null) { pkg.mOriginalPackages = new ArrayList<String>(); pkg.mRealPackage = pkg.packageName; } pkg.mOriginalPackages.add(orig); } sa.recycle(); XmlUtils.skipCurrentTag(parser); // 解析<adopt-permissions>标签 } else if (tagName.equals(TAG_ADOPT_PERMISSIONS)) { sa = res.obtainAttributes(parser, com.android.internal.R.styleable.AndroidManifestOriginalPackage); String name = sa.getNonConfigurationString( com.android.internal.R.styleable.AndroidManifestOriginalPackage_name, 0); sa.recycle(); if (name != null) { if (pkg.mAdoptPermissions == null) { pkg.mAdoptPermissions = new ArrayList<String>(); } pkg.mAdoptPermissions.add(name); } XmlUtils.skipCurrentTag(parser); // 解析<uses-gl-texture>标签 } else if (tagName.equals(TAG_USES_GL_TEXTURE)) { // Just skip this tag XmlUtils.skipCurrentTag(parser); continue; // 解析<compatible-screens>标签 } else if (tagName.equals(TAG_COMPATIBLE_SCREENS)) { // Just skip this tag XmlUtils.skipCurrentTag(parser); continue; // 解析<supports-input>标签 } else if (tagName.equals(TAG_SUPPORTS_INPUT)) {// XmlUtils.skipCurrentTag(parser); continue; // 解析<eat-comment>标签 } else if (tagName.equals(TAG_EAT_COMMENT)) { // Just skip this tag XmlUtils.skipCurrentTag(parser); continue; } else if (tagName.equals(TAG_PACKAGE)) { if (!MULTI_PACKAGE_APK_ENABLED) { XmlUtils.skipCurrentTag(parser); continue; } if (!parseBaseApkChild(pkg, res, parser, flags, outError)) { // If parsing a child failed the error is already set return null; } } else if (tagName.equals(TAG_RESTRICT_UPDATE)) { if ((flags & PARSE_IS_SYSTEM_DIR) != 0) { sa = res.obtainAttributes(parser, com.android.internal.R.styleable.AndroidManifestRestrictUpdate); final String hash = sa.getNonConfigurationString( com.android.internal.R.styleable.AndroidManifestRestrictUpdate_hash, 0); sa.recycle(); pkg.restrictUpdateHash = null; if (hash != null) { final int hashLength = hash.length(); final byte[] hashBytes = new byte[hashLength / 2]; for (int i = 0; i < hashLength; i += 2){ hashBytes[i/2] = (byte) ((Character.digit(hash.charAt(i), 16) << 4) + Character.digit(hash.charAt(i + 1), 16)); } pkg.restrictUpdateHash = hashBytes; } } XmlUtils.skipCurrentTag(parser); } else if (RIGID_PARSER) { outError[0] = “Bad element under <manifest>: " + parser.getName(); mParseError = PackageManager.INSTALL_PARSE_FAILED_MANIFEST_MALFORMED; return null; } else { Slog.w(TAG, “Unknown element under <manifest>: " + parser.getName() + " at " + mArchiveSourcePath + " " + parser.getPositionDescription()); XmlUtils.skipCurrentTag(parser); continue; } }parseBaseApplication private boolean parseBaseApplication(Package owner, Resources res, XmlResourceParser parser, int flags, String[] outError) throws XmlPullParserException, IOException { // 获取ApplicationInfo对象ai final ApplicationInfo ai = owner.applicationInfo; // 获取包名 final String pkgName = owner.applicationInfo.packageName; // 从资源里面获取AndroidManifest的数组 TypedArray sa = res.obtainAttributes(parser, com.android.internal.R.styleable.AndroidManifestApplication); if (!parsePackageItemInfo(owner, ai, outError, “<application>”, sa, false /nameRequired/, com.android.internal.R.styleable.AndroidManifestApplication_name, com.android.internal.R.styleable.AndroidManifestApplication_label, com.android.internal.R.styleable.AndroidManifestApplication_icon, com.android.internal.R.styleable.AndroidManifestApplication_roundIcon, com.android.internal.R.styleable.AndroidManifestApplication_logo, com.android.internal.R.styleable.AndroidManifestApplication_banner)) { sa.recycle(); mParseError = PackageManager.INSTALL_PARSE_FAILED_MANIFEST_MALFORMED; return false; } if (ai.name != null) { ai.className = ai.name; } // 在AndroidManifest里面是否设置了android:manageSpaceActivity属性， // 如果设置了则manageSpaceActivity不为空，没有设置manageSpaceActivity为空 String manageSpaceActivity = sa.getNonConfigurationString( com.android.internal.R.styleable.AndroidManifestApplication_manageSpaceActivity, Configuration.NATIVE_CONFIG_VERSION); if (manageSpaceActivity != null) { // 如果设置了，则添加类名 ai.manageSpaceActivityName = buildClassName(pkgName, manageSpaceActivity, outError); } // 是否设置了androidMannifest.xml文件中android:allowBackup属性; boolean allowBackup = sa.getBoolean( com.android.internal.R.styleable.AndroidManifestApplication_allowBackup, true); // 如果设置了允许备份 if (allowBackup) { ai.flags |= ApplicationInfo.FLAG_ALLOW_BACKUP; // backupAgent, killAfterRestore, fullBackupContent, backupInForeground, // and restoreAnyVersion are only relevant if backup is possible for the // given application. // 获取backupAgent，如果在AndroidManifest里面设置了android:backupAgent属性， // 则backupAgent不为空，否则backupAgent为空 String backupAgent = sa.getNonConfigurationString( com.android.internal.R.styleable.AndroidManifestApplication_backupAgent, Configuration.NATIVE_CONFIG_VERSION); // 设置了backupAgent，这构建类名 if (backupAgent != null) { ai.backupAgentName = buildClassName(pkgName, backupAgent, outError); if (DEBUG_BACKUP) { Slog.v(TAG, “android:backupAgent = " + ai.backupAgentName + " from " + pkgName + “+” + backupAgent); } if (sa.getBoolean( com.android.internal.R.styleable.AndroidManifestApplication_killAfterRestore, true)) { ai.flags |= ApplicationInfo.FLAG_KILL_AFTER_RESTORE; } if (sa.getBoolean( com.android.internal.R.styleable.AndroidManifestApplication_restoreAnyVersion, false)) { ai.flags |= ApplicationInfo.FLAG_RESTORE_ANY_VERSION; } if (sa.getBoolean( com.android.internal.R.styleable.AndroidManifestApplication_fullBackupOnly, false)) { ai.flags |= ApplicationInfo.FLAG_FULL_BACKUP_ONLY; } if (sa.getBoolean( com.android.internal.R.styleable.AndroidManifestApplication_backupInForeground, false)) { ai.privateFlags |= ApplicationInfo.PRIVATE_FLAG_BACKUP_IN_FOREGROUND; } } TypedValue v = sa.peekValue( com.android.internal.R.styleable.AndroidManifestApplication_fullBackupContent); if (v != null && (ai.fullBackupContent = v.resourceId) == 0) { if (DEBUG_BACKUP) { Slog.v(TAG, “fullBackupContent specified as boolean=” + (v.data == 0 ? “false” : “true”)); } // “false” => -1, “true” => 0 ai.fullBackupContent = (v.data == 0 ? -1 : 0); } if (DEBUG_BACKUP) { Slog.v(TAG, “fullBackupContent=” + ai.fullBackupContent + " for " + pkgName); } } ai.theme = sa.getResourceId( com.android.internal.R.styleable.AndroidManifestApplication_theme, 0); ai.descriptionRes = sa.getResourceId( com.android.internal.R.styleable.AndroidManifestApplication_description, 0); if ((flags&PARSE_IS_SYSTEM) != 0) { if (sa.getBoolean( com.android.internal.R.styleable.AndroidManifestApplication_persistent, false)) { // Check if persistence is based on a feature being present final String requiredFeature = sa.getNonResourceString( com.android.internal.R.styleable. AndroidManifestApplication_persistentWhenFeatureAvailable); if (requiredFeature == null || mCallback.hasFeature(requiredFeature)) { ai.flags |= ApplicationInfo.FLAG_PERSISTENT; } } } if (sa.getBoolean( com.android.internal.R.styleable.AndroidManifestApplication_requiredForAllUsers, false)) { owner.mRequiredForAllUsers = true; } String restrictedAccountType = sa.getString(com.android.internal.R.styleable .AndroidManifestApplication_restrictedAccountType); if (restrictedAccountType != null && restrictedAccountType.length() > 0) { owner.mRestrictedAccountType = restrictedAccountType; } String requiredAccountType = sa.getString(com.android.internal.R.styleable .AndroidManifestApplication_requiredAccountType); if (requiredAccountType != null && requiredAccountType.length() > 0) { owner.mRequiredAccountType = requiredAccountType; } if (sa.getBoolean( com.android.internal.R.styleable.AndroidManifestApplication_debuggable, false)) { ai.flags |= ApplicationInfo.FLAG_DEBUGGABLE; } if (sa.getBoolean( com.android.internal.R.styleable.AndroidManifestApplication_vmSafeMode, false)) { ai.flags |= ApplicationInfo.FLAG_VM_SAFE_MODE; } owner.baseHardwareAccelerated = sa.getBoolean( com.android.internal.R.styleable.AndroidManifestApplication_hardwareAccelerated, owner.applicationInfo.targetSdkVersion >= Build.VERSION_CODES.ICE_CREAM_SANDWICH); if (owner.baseHardwareAccelerated) { ai.flags |= ApplicationInfo.FLAG_HARDWARE_ACCELERATED; } if (sa.getBoolean( com.android.internal.R.styleable.AndroidManifestApplication_hasCode, true)) { ai.flags |= ApplicationInfo.FLAG_HAS_CODE; } if (sa.getBoolean( com.android.internal.R.styleable.AndroidManifestApplication_allowTaskReparenting, false)) { ai.flags |= ApplicationInfo.FLAG_ALLOW_TASK_REPARENTING; } if (sa.getBoolean( com.android.internal.R.styleable.AndroidManifestApplication_allowClearUserData, true)) { ai.flags |= ApplicationInfo.FLAG_ALLOW_CLEAR_USER_DATA; } // The parent package controls installation, hence specify test only installs. if (owner.parentPackage == null) { if (sa.getBoolean( com.android.internal.R.styleable.AndroidManifestApplication_testOnly, false)) { ai.flags |= ApplicationInfo.FLAG_TEST_ONLY; } } if (sa.getBoolean( com.android.internal.R.styleable.AndroidManifestApplication_largeHeap, false)) { ai.flags |= ApplicationInfo.FLAG_LARGE_HEAP; } if (sa.getBoolean( com.android.internal.R.styleable.AndroidManifestApplication_usesCleartextTraffic, true)) { ai.flags |= ApplicationInfo.FLAG_USES_CLEARTEXT_TRAFFIC; } if (sa.getBoolean( com.android.internal.R.styleable.AndroidManifestApplication_supportsRtl, false / default is no RTL support*/)) { ai.flags |= ApplicationInfo.FLAG_SUPPORTS_RTL; } if (sa.getBoolean( com.android.internal.R.styleable.AndroidManifestApplication_multiArch, false)) { ai.flags |= ApplicationInfo.FLAG_MULTIARCH; } if (sa.getBoolean( com.android.internal.R.styleable.AndroidManifestApplication_extractNativeLibs, true)) { ai.flags |= ApplicationInfo.FLAG_EXTRACT_NATIVE_LIBS; } if (sa.getBoolean( R.styleable.AndroidManifestApplication_defaultToDeviceProtectedStorage, false)) { ai.privateFlags |= ApplicationInfo.PRIVATE_FLAG_DEFAULT_TO_DEVICE_PROTECTED_STORAGE; } if (sa.getBoolean( R.styleable.AndroidManifestApplication_directBootAware, false)) { ai.privateFlags |= ApplicationInfo.PRIVATE_FLAG_DIRECT_BOOT_AWARE; } if (sa.hasValueOrEmpty(R.styleable.AndroidManifestApplication_resizeableActivity)) { if (sa.getBoolean(R.styleable.AndroidManifestApplication_resizeableActivity, true)) { ai.privateFlags |= PRIVATE_FLAG_ACTIVITIES_RESIZE_MODE_RESIZEABLE; } else { ai.privateFlags |= PRIVATE_FLAG_ACTIVITIES_RESIZE_MODE_UNRESIZEABLE; } } else if (owner.applicationInfo.targetSdkVersion >= Build.VERSION_CODES.N) { ai.privateFlags |= PRIVATE_FLAG_ACTIVITIES_RESIZE_MODE_RESIZEABLE_VIA_SDK_VERSION; } ai.maxAspectRatio = sa.getFloat(R.styleable.AndroidManifestApplication_maxAspectRatio, 0); ai.networkSecurityConfigRes = sa.getResourceId( com.android.internal.R.styleable.AndroidManifestApplication_networkSecurityConfig, 0); ai.category = sa.getInt( com.android.internal.R.styleable.AndroidManifestApplication_appCategory, ApplicationInfo.CATEGORY_UNDEFINED); String str; str = sa.getNonConfigurationString( com.android.internal.R.styleable.AndroidManifestApplication_permission, 0); ai.permission = (str != null && str.length() > 0) ? str.intern() : null; if (owner.applicationInfo.targetSdkVersion >= Build.VERSION_CODES.FROYO) { str = sa.getNonConfigurationString( com.android.internal.R.styleable.AndroidManifestApplication_taskAffinity, Configuration.NATIVE_CONFIG_VERSION); } else { // Some older apps have been seen to use a resource reference // here that on older builds was ignored (with a warning). We // need to continue to do this for them so they don’t break. str = sa.getNonResourceString( com.android.internal.R.styleable.AndroidManifestApplication_taskAffinity); } ai.taskAffinity = buildTaskAffinityName(ai.packageName, ai.packageName, str, outError); if (outError[0] == null) { CharSequence pname; if (owner.applicationInfo.targetSdkVersion >= Build.VERSION_CODES.FROYO) { pname = sa.getNonConfigurationString( com.android.internal.R.styleable.AndroidManifestApplication_process, Configuration.NATIVE_CONFIG_VERSION); } else { // Some older apps have been seen to use a resource reference // here that on older builds was ignored (with a warning). We // need to continue to do this for them so they don’t break. pname = sa.getNonResourceString( com.android.internal.R.styleable.AndroidManifestApplication_process); } ai.processName = buildProcessName(ai.packageName, null, pname, flags, mSeparateProcesses, outError); ai.enabled = sa.getBoolean( com.android.internal.R.styleable.AndroidManifestApplication_enabled, true); if (sa.getBoolean( com.android.internal.R.styleable.AndroidManifestApplication_isGame, false)) { ai.flags |= ApplicationInfo.FLAG_IS_GAME; } if (false) { if (sa.getBoolean( com.android.internal.R.styleable.AndroidManifestApplication_cantSaveState, false)) { ai.privateFlags |= ApplicationInfo.PRIVATE_FLAG_CANT_SAVE_STATE; // A heavy-weight application can not be in a custom process. // We can do direct compare because we intern all strings. if (ai.processName != null && ai.processName != ai.packageName) { outError[0] = “cantSaveState applications can not use custom processes”; } } } } ai.uiOptions = sa.getInt( com.android.internal.R.styleable.AndroidManifestApplication_uiOptions, 0); ai.classLoaderName = sa.getString( com.android.internal.R.styleable.AndroidManifestApplication_classLoader); if (ai.classLoaderName != null && !ClassLoaderFactory.isValidClassLoaderName(ai.classLoaderName)) { outError[0] = “Invalid class loader name: " + ai.classLoaderName; } sa.recycle(); if (outError[0] != null) { mParseError = PackageManager.INSTALL_PARSE_FAILED_MANIFEST_MALFORMED; return false; } final int innerDepth = parser.getDepth(); // IMPORTANT: These must only be cached for a single <application> to avoid components // getting added to the wrong package. final CachedComponentArgs cachedArgs = new CachedComponentArgs(); int type; // 开始解析 while ((type = parser.next()) != XmlPullParser.END_DOCUMENT && (type != XmlPullParser.END_TAG || parser.getDepth() > innerDepth)) { if (type == XmlPullParser.END_TAG || type == XmlPullParser.TEXT) { continue; } String tagName = parser.getName(); // 解析activity if (tagName.equals(“activity”)) { Activity a = parseActivity(owner, res, parser, flags, outError, cachedArgs, false, owner.baseHardwareAccelerated); if (a == null) { mParseError = PackageManager.INSTALL_PARSE_FAILED_MANIFEST_MALFORMED; return false; } owner.activities.add(a); // 解析receiver } else if (tagName.equals(“receiver”)) { Activity a = parseActivity(owner, res, parser, flags, outError, cachedArgs, true, false); if (a == null) { mParseError = PackageManager.INSTALL_PARSE_FAILED_MANIFEST_MALFORMED; return false; } owner.receivers.add(a); // 解析service } else if (tagName.equals(“service”)) { Service s = parseService(owner, res, parser, flags, outError, cachedArgs); if (s == null) { mParseError = PackageManager.INSTALL_PARSE_FAILED_MANIFEST_MALFORMED; return false; } owner.services.add(s); // 解析provider } else if (tagName.equals(“provider”)) { Provider p = parseProvider(owner, res, parser, flags, outError, cachedArgs); if (p == null) { mParseError = PackageManager.INSTALL_PARSE_FAILED_MANIFEST_MALFORMED; return false; } owner.providers.add(p); … … } else { if (!RIGID_PARSER) { Slog.w(TAG, “Unknown element under <application>: " + tagName + " at " + mArchiveSourcePath + " " + parser.getPositionDescription()); XmlUtils.skipCurrentTag(parser); continue; } else { outError[0] = “Bad element under <application>: " + tagName; mParseError = PackageManager.INSTALL_PARSE_FAILED_MANIFEST_MALFORMED; return false; } } } // Must be ran after the entire {@link ApplicationInfo} has been fully processed and after // every activity info has had a chance to set it from its attributes. setMaxAspectRatio(owner); PackageBackwardCompatibility.modifySharedLibraries(owner); // 检查IntentFilter之一是否包含DEFAULT / VIEW和HTTP / HTTPS数据URI if (hasDomainURLs(owner)) { owner.applicationInfo.privateFlags |= ApplicationInfo.PRIVATE_FLAG_HAS_DOMAIN_URLS; } else { owner.applicationInfo.privateFlags &= ~ApplicationInfo.PRIVATE_FLAG_HAS_DOMAIN_URLS; } return true; }其实这个方法就是解析了application节点下的所有信息，比如activity、service、receiver、provider、library、users-librayry等信息，同时将解析后的每一个属性生成相应的对象，添加到传入的package里面，这些信息最后都会在PackageManagerService中用到。扫描非系统 Package if (!mOnlyCore) { // mOnlyCore 用于控制是否扫描非系统 Package // do this first before mucking with mPackages for the “expecting better” case final Iterator<PackageParser.Package> pkgIterator = mPackages.values().iterator(); while (pkgIterator.hasNext()) { final PackageParser.Package pkg = pkgIterator.next(); if (pkg.isStub) { stubSystemApps.add(pkg.packageName); } } final Iterator<PackageSetting> psit = mSettings.mPackages.values().iterator(); while (psit.hasNext()) { PackageSetting ps = psit.next(); /* * If this is not a system app, it can’t be a * disable system app. / if ((ps.pkgFlags & ApplicationInfo.FLAG_SYSTEM) == 0) { /// M: Operator apps are belong to system domain, therefore, need prune. /// We should also consider OTA from old version without mtkFlag if (sPmsExt.isNotOperatorApp(ps)) continue; } / * If the package is scanned, it’s not erased. / final PackageParser.Package scannedPkg = mPackages.get(ps.name); if (scannedPkg != null) { / * If the system app is both scanned and in the * disabled packages list, then it must have been * added via OTA. Remove it from the currently * scanned package so the previously user-installed * application can be scanned. / if (mSettings.isDisabledSystemPackageLPr(ps.name)) { logCriticalInfo(Log.WARN, “Expecting better updated system app for " + ps.name + “; removing system app. Last known codePath=” + ps.codePathString + “, installStatus=” + ps.installStatus + “, versionCode=” + ps.versionCode + “; scanned versionCode=” + scannedPkg.mVersionCode); removePackageLI(scannedPkg, true); mExpectingBetter.put(ps.name, ps.codePath); } continue; } if (!mSettings.isDisabledSystemPackageLPr(ps.name)) { psit.remove(); logCriticalInfo(Log.WARN, “System package " + ps.name + " no longer exists; it’s data will be wiped”); // Actual deletion of code and data will be handled by later // reconciliation step } else { // we still have a disabled system package, but, it still might have // been removed. check the code path still exists and check there’s // still a package. the latter can happen if an OTA keeps the same // code path, but, changes the package name. final PackageSetting disabledPs = mSettings.getDisabledSystemPkgLPr(ps.name); if (disabledPs.codePath == null || !disabledPs.codePath.exists() || disabledPs.pkg == null) { possiblyDeletedUpdatedSystemApps.add(ps.name); } } } } if (!mOnlyCore) { scanDirTracedLI(mAppInstallDir, 0, scanFlags | SCAN_REQUIRE_KNOWN, 0); scanDirTracedLI(mDrmAppPrivateInstallDir, mDefParseFlags | PackageParser.PARSE_FORWARD_LOCK, scanFlags | SCAN_REQUIRE_KNOWN, 0); // Remove disable package settings for updated system apps that were // removed via an OTA. If the update is no longer present, remove the // app completely. Otherwise, revoke their system privileges. for (String deletedAppName : possiblyDeletedUpdatedSystemApps) { PackageParser.Package deletedPkg = mPackages.get(deletedAppName); mSettings.removeDisabledSystemPackageLPw(deletedAppName); final String msg; if (deletedPkg == null) { // should have found an update, but, we didn’t; remove everything msg = “Updated system package " + deletedAppName + " no longer exists; removing its data”; // Actual deletion of code and data will be handled by later // reconciliation step } else { // found an update; revoke system privileges msg = “Updated system package + " + deletedAppName + " no longer exists; revoking system privileges”; // Don’t do anything if a stub is removed from the system image. If // we were to remove the uncompressed version from the /data partition, // this is where it’d be done. final PackageSetting deletedPs = mSettings.mPackages.get(deletedAppName); deletedPkg.applicationInfo.flags &= ~ApplicationInfo.FLAG_SYSTEM; deletedPs.pkgFlags &= ~ApplicationInfo.FLAG_SYSTEM; /// M: [Operator] Revoke operator permissions for the original operator sPmsExt.clearExtFlags(deletedPkg, deletedPs); } logCriticalInfo(Log.WARN, msg); } / * Make sure all system apps that we expected to appear on * the userdata partition actually showed up. If they never * appeared, crawl back and revive the system version. */ for (int i = 0; i < mExpectingBetter.size(); i++) { final String packageName = mExpectingBetter.keyAt(i); if (!mPackages.containsKey(packageName)) { final File scanFile = mExpectingBetter.valueAt(i); logCriticalInfo(Log.WARN, “Expected better " + packageName + " but never showed up; reverting to system”); int reparseFlags = mDefParseFlags; if (FileUtils.contains(privilegedAppDir, scanFile)) { reparseFlags = PackageParser.PARSE_IS_SYSTEM | PackageParser.PARSE_IS_SYSTEM_DIR | PackageParser.PARSE_IS_PRIVILEGED; } else if (FileUtils.contains(systemAppDir, scanFile)) { reparseFlags = PackageParser.PARSE_IS_SYSTEM | PackageParser.PARSE_IS_SYSTEM_DIR; } else if (FileUtils.contains(vendorAppDir, scanFile)) { reparseFlags = PackageParser.PARSE_IS_SYSTEM | PackageParser.PARSE_IS_SYSTEM_DIR; } else if (FileUtils.contains(oemAppDir, scanFile)) { reparseFlags = PackageParser.PARSE_IS_SYSTEM | PackageParser.PARSE_IS_SYSTEM_DIR; } else { Slog.e(TAG, “Ignoring unexpected fallback path " + scanFile); continue; } mSettings.enableSystemPackageLPw(packageName); try { scanPackageTracedLI(scanFile, reparseFlags, scanFlags, 0, null); } catch (PackageManagerException e) { Slog.e(TAG, “Failed to parse original system package: " + e.getMessage()); } } } // Uncompress and install any stubbed system applications. // This must be done last to ensure all stubs are replaced or disabled. decompressSystemApplications(stubSystemApps, scanFlags); final int cachedNonSystemApps = PackageParser.sCachedPackageReadCount.get() - cachedSystemApps; final long dataScanTime = SystemClock.uptimeMillis() - systemScanTime - startTime; final int dataPackagesCount = mPackages.size() - systemPackagesCount; Slog.i(TAG, “Finished scanning non-system apps. Time: " + dataScanTime + " ms, packageCount: " + dataPackagesCount + " , timePerPackage: " + (dataPackagesCount == 0 ? 0 : dataScanTime / dataPackagesCount) + " , cached: " + cachedNonSystemApps); if (mIsUpgrade && dataPackagesCount > 0) { MetricsLogger.histogram(null, “ota_package_manager_data_app_avg_scan_time”, ((int) dataScanTime) / dataPackagesCount); } }构造函数分析 - 扫尾工作这部分任务比较简单，就是将第二阶段手机的信息再集中整理一次，可自行研究。总结第二阶段分析就此结束！
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