我在上一篇檔案中Android應用程式安裝過程淺析粗略分析了一下Android應用程式安裝過程，其中有一步說到了apk包的解析，但是沒有詳細分析，這裡我們就來粗略分析一下包的解析過程。

流程圖

執行過程

       從上面的流程圖可以看到，包的解析過程比安裝過程執行步驟少很多，也簡單一點。那我們就來詳細的一步一步的進行剖析一下，我們從外部呼叫該方法開始分析：

private void installPackageLI(InstallArgs args, PackageInstalledInfo res) {
    final int installFlags = args.installFlags;
    final
 
 String installerPackageName = args.installerPackageName;
    final String volumeUuid = args.volumeUuid;
    final File tmpPackageFile = new File(args.getCodePath());
    final boolean forwardLocked = ((installFlags & PackageManager.INSTALL_FORWARD_LOCK) != 0);
    final boolean onExternal = (((installFlags & PackageManager.INSTALL_EXTERNAL) != 0
 
)
            || (args.volumeUuid != null));
    boolean replace = false;
    int scanFlags = SCAN_NEW_INSTALL | SCAN_UPDATE_SIGNATURE;
    if (args.move != null) {
        // moving a complete application; perfom an initial scan on the new install location
        scanFlags |= SCAN_INITIAL;
    }
    // Result object to be returned
 

    res.returnCode = PackageManager.INSTALL_SUCCEEDED;

    if (DEBUG_INSTALL) Slog.d(TAG, "installPackageLI: path=" + tmpPackageFile);
    // Retrieve PackageSettings and parse package
    final int parseFlags = mDefParseFlags | PackageParser.PARSE_CHATTY
            | (forwardLocked ? PackageParser.PARSE_FORWARD_LOCK : 0)
            | (onExternal ? PackageParser.PARSE_EXTERNAL_STORAGE : 0);
    PackageParser pp = new PackageParser();
    pp.setSeparateProcesses(mSeparateProcesses);
    pp.setDisplayMetrics(mMetrics);

    final PackageParser.Package pkg;
    try {
        pkg = pp.parsePackage(tmpPackageFile, parseFlags);
    } catch (PackageParserException e) {
        res.setError("Failed parse during installPackageLI", e);
        return;
    }

    // Mark that we have an install time CPU ABI override.
    pkg.cpuAbiOverride = args.abiOverride;

    String pkgName = res.name = pkg.packageName;
    if ((pkg.applicationInfo.flags&ApplicationInfo.FLAG_TEST_ONLY) != 0) {
        if ((installFlags & PackageManager.INSTALL_ALLOW_TEST) == 0) {
            res.setError(INSTALL_FAILED_TEST_ONLY, "installPackageLI");
            return;
        }
    }

    try {
        pp.collectCertificates(pkg, parseFlags);
        pp.collectManifestDigest(pkg);
    } catch (PackageParserException e) {
        res.setError("Failed collect during installPackageLI", e);
        return;
    }
    .......
}

       可以看到在解析之前先構造了一個PackageParser，之後設定了mSeparateProcesses與mMetrics屬性，mSeparateProcesses是一個數組，表示的獨立的程序名列表，這個引數是在PackageManagerService的建構函式中呼叫的，以後會分析一下該函式是在什麼地方呼叫的，這裡就先看看mSeparateProcesses的獲取過程：

String separateProcesses = SystemProperties.get("debug.separate_processes");
if (separateProcesses != null && separateProcesses.length() > 0) {
    if ("*".equals(separateProcesses)) {
        mDefParseFlags = PackageParser.PARSE_IGNORE_PROCESSES;
        mSeparateProcesses = null;
        Slog.w(TAG, "Running with debug.separate_processes: * (ALL)");
    } else {
        mDefParseFlags = 0;
        mSeparateProcesses = separateProcesses.split(",");
        Slog.w(TAG, "Running with debug.separate_processes: "
                + separateProcesses);
    }
} else {
    mDefParseFlags = 0;
    mSeparateProcesses = null;
}

       從系統屬性中讀取debug.separate_processes屬性，如果改屬性返回值不為空，表示設定了該屬性，否則系統未設定改屬性，如果值等於則mSeparateProcesses為空，如果不為，則逗號分隔該字串，解析每個獨立的程序名，那個debug.separate_processes究竟有什麼用？是幹什麼的？我們來看看官方給出的解釋：

       Add android.separate_processes property you can use to force application components to run in their own process. There are two ways you can use this:

setprop debug.separate_processes - This will apply to every process in every package.
setprop debug.separate_processes “com.google.process.content,com.google.android.samples” - This will impact only the code whose manifest involves one of the given processes (here com.google.process.content com.google.android.samples)
       – either as the manifest package name, or listed as an explicit android:process tag. Note that using this option will either split a process into parts (corresponding to the packages inside of it)or combine multiple processes into one (if they come from the same package). That is, it forces all impacted components to run in the process for their own .apk, regardless of what android:process attributes specify.

       可以知道該屬性可以強制使應用程式元件執行在他自己的程序，主要作為除錯用。

       mMetrics是一個描述介面顯示，尺寸，解析度，密度的類。我們說完了這兩個引數，我們來看看parsePackage(tmpPackageFile, parseFlags);tmpPackageFile是包的存放路徑，parseFlags為解析標識，返回值一個Package物件。我們來看看parsePackage函式：

public Package parsePackage(File packageFile, int flags) throws PackageParserException {
    if (packageFile.isDirectory()) {
        return parseClusterPackage(packageFile, flags);
    } else {
        return parseMonolithicPackage(packageFile, flags);
    }
}

       如果傳入的是一個檔案目錄，則表示有多個apk需要解析，否則單個apk需要解析，這我們就只看單個的解析，因為多個最終還是會一個一個呼叫單個解析。我們來根進單個解析程式碼看看執行邏輯：

public Package parseMonolithicPackage(File apkFile, int flags) throws PackageParserException {
    if (mOnlyCoreApps) {
        final PackageLite lite = parseMonolithicPackageLite(apkFile, flags);
        if (!lite.coreApp) {
            throw new PackageParserException(INSTALL_PARSE_FAILED_MANIFEST_MALFORMED,
                    "Not a coreApp: " + apkFile);
        }
    }

    final AssetManager assets = new AssetManager();
    try {
        final Package pkg = parseBaseApk(apkFile, assets, flags);
        pkg.codePath = apkFile.getAbsolutePath();
        return pkg;
    } finally {
        IoUtils.closeQuietly(assets);
    }
}

       首先判斷是不是mOnlyCoreApps，mOnlyCoreApps該標識表明解析只考慮應用清單屬性有效的應用，主要是為了建立一個最小的啟動環境，如果該標識為true則輕量級解析，呼叫parseMonolithicPackageLite來進行解析，返回一個PackageLite物件。我們就先看輕量級解析等會在返回看全部解析：

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);
}

       parseMonolithicPackageLite內部又呼叫了parseApkLite函式並且返回一個ApkLite物件，根據返回的ApkLite物件和包的局對路徑構造了一個PackageLite物件作為返回值。我們看看parseApkLite函式：

public static ApkLite parseApkLite(File apkFile, int flags)
        throws PackageParserException {
    final String apkPath = apkFile.getAbsolutePath();

    AssetManager assets = null;
    XmlResourceParser parser = null;
    try {
        assets = new AssetManager();
        assets.setConfiguration(0, 0, null, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
                Build.VERSION.RESOURCES_SDK_INT);

        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();

        final Resources res = new Resources(assets, metrics, null);
        parser = assets.openXmlResourceParser(cookie, ANDROID_MANIFEST_FILENAME);

        final Signature[] signatures;
        if ((flags & PARSE_COLLECT_CERTIFICATES) != 0) {
            // TODO: factor signature related items out of Package object
            final Package tempPkg = new Package(null);
            collectCertificates(tempPkg, apkFile, 0);
            signatures = tempPkg.mSignatures;
        } else {
            signatures = null;
        }

        final AttributeSet attrs = parser;
        return parseApkLite(apkPath, res, parser, attrs, flags, signatures);

    } catch (XmlPullParserException | IOException | RuntimeException e) {
        throw new PackageParserException(INSTALL_PARSE_FAILED_UNEXPECTED_EXCEPTION,
                "Failed to parse " + apkPath, e);
    } finally {
        IoUtils.closeQuietly(parser);
        IoUtils.closeQuietly(assets);
    }
}

       函式裡首先初始化了一個AssetManager物件，一個DisplayMetrics物件，一個Resources，並且呼叫collectCertificates函式獲取了應用的簽名信息，這些物件都是後續解析中需要用到的，因此將這些引數傳遞給解析函式，解析完成後關閉資源管理器與解析器，這裡主要是輕量級解析，只解析了包名，安裝位置等少量資訊，我們來看看解析過程：

private static ApkLite parseApkLite(String codePath, Resources res, XmlPullParser parser,
        AttributeSet attrs, int flags, Signature[] signatures) throws IOException,
        XmlPullParserException, PackageParserException {
    final Pair<String, String> packageSplit = parsePackageSplitNames(parser, attrs, flags);

    int installLocation = PARSE_DEFAULT_INSTALL_LOCATION;
    int versionCode = 0;
    int revisionCode = 0;
    boolean coreApp = false;
    boolean multiArch = false;
    boolean extractNativeLibs = true;

    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);
        }
    }

    // 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>();
    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 && "package-verifier".equals(parser.getName())) {
            final VerifierInfo verifier = parseVerifier(res, parser, attrs, flags);
            if (verifier != null) {
                verifiers.add(verifier);
            }
        }

        if (parser.getDepth() == searchDepth && "application".equals(parser.getName())) {
            for (int i = 0; i < attrs.getAttributeCount(); ++i) {
                final String attr = attrs.getAttributeName(i);
                if ("multiArch".equals(attr)) {
                    multiArch = attrs.getAttributeBooleanValue(i, false);
                }
                if ("extractNativeLibs".equals(attr)) {
                    extractNativeLibs = attrs.getAttributeBooleanValue(i, true);
                }
            }
        }
    }

    return new ApkLite(codePath, packageSplit.first, packageSplit.second, versionCode,
            revisionCode, installLocation, verifiers, signatures, coreApp, multiArch,
            extractNativeLibs);
}

       這裡首先解析返回包名和split名（這個不知道是啥），這個說點額外的東西，在parsePackageSplitNames裡面呼叫了validateName函式，我們來看看validateName函式：

private static String validateName(String name, boolean requireSeparator,
        boolean requireFilename) {
    final int N = name.length();
    boolean hasSep = false;
    boolean front = true;
    for (int i=0; i<N; i++) {
        final char c = name.charAt(i);
        if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')) {
            front = false;
            continue;
        }
        if (!front) {
            if ((c >= '0' && c <= '9') || c == '_') {
                continue;
            }
        }
        if (c == '.') {
            hasSep = true;
            front = true;
            continue;
        }
        return "bad character '" + c + "'";
    }
    if (requireFilename && !FileUtils.isValidExtFilename(name)) {
        return "Invalid filename";
    }
    return hasSep || !requireSeparator
            ? null : "must have at least one '.' separator";
}

       可以看到主要檢測了是否是數字，字母，下劃線和點分割符，這也是取包名的規則，比如是字母數字下劃線加點火分割符，否則都不是合法的應用包名。並且合法的包名至少包含有一個點分隔符。

       解析完包名之後，迴圈解析installLocation，versionCode，revisionCode，coreApp,接著繼續解析package-verifier節點，該節點主要是前面資訊相關的信心，最後解析application節點，該節點主要解析兩個屬性：multiArch，extractNativeLibs屬性，將上述解析的資訊構造成一個ApkLite物件返回。
       輕量級解析完成後，我們繼續來看看parseBaseApk函式。先構造一個AssetManager物件傳入該函式。我們來詳細分析一個該函式：

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);
        assets.setConfiguration(0, 0, null, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
                Build.VERSION.RESOURCES_SDK_INT);
        parser = assets.openXmlResourceParser(cookie, ANDROID_MANIFEST_FILENAME);

        final String[] outError = new String[1];
        final Package pkg = parseBaseApk(res, parser, flags, outError);
        if (pkg == null) {
            throw new PackageParserException(mParseError,
                    apkPath + " (at " + parser.getPositionDescription() + "): " + outError[0]);
        }

        pkg.volumeUuid = volumeUuid;
        pkg.baseCodePath = apkPath;
        pkg.mSignatures = 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);
    }
}

       該函式的前幾步與輕量級解析一致，主要多了一個步驟解析volumeUuid，如果apk路徑的前置為/mnt/expand/，則獲取從該字首之後的uuid，具體幹嘛用的，主要是根據這個獲取檔案路徑。我們來看看詳細解析的程式碼：

    /**
     * Parse the manifest of a <em>base APK</em>.
     * <p>
     * When adding new features, carefully consider if they should also be
     * supported by split APKs.
     */
    private Package parseBaseApk(Resources res, XmlResourceParser parser, int flags,
            String[] outError) throws XmlPullParserException, IOException {
        final boolean trustedOverlay = (flags & PARSE_TRUSTED_OVERLAY) != 0;

        AttributeSet attrs = parser;

        mParseInstrumentationArgs = null;
        mParseActivityArgs = null;
        mParseServiceArgs = null;
        mParseProviderArgs = null;

        final String pkgName;
        final String splitName;
        try {
            Pair<String, String> packageSplit = parsePackageSplitNames(parser, attrs, flags);
            pkgName = packageSplit.first;
            splitName = packageSplit.second;
        } catch (PackageParserException e) {
            mParseError = PackageManager.INSTALL_PARSE_FAILED_BAD_PACKAGE_NAME;
            return null;
        }

        int type;

        if (!TextUtils.isEmpty(splitName)) {
            outError[0] = "Expected base APK, but found split " + splitName;
            mParseError = PackageManager.INSTALL_PARSE_FAILED_BAD_PACKAGE_NAME;
            return null;
        }

        final Package pkg = new Package(pkgName);
        boolean foundApp = false;

        TypedArray sa = res.obtainAttributes(attrs,
                com.android.internal.R.styleable.AndroidManifest);
        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();
        }
        String str = sa.getNonConfigurationString(
                com.android.internal.R.styleable.AndroidManifest_sharedUserId, 0);
        if (str != null && str.length() > 0) {
            String nameError = validateName(str, true, false);
            if (nameError != null && !"android".equals(pkgName)) {
                outError[0] = "<manifest> specifies bad sharedUserId name \""
                    + str + "\": " + nameError;
                mParseError = PackageManager.INSTALL_PARSE_FAILED_BAD_SHARED_USER_ID;
                return null;
            }
            pkg.mSharedUserId = str.intern();
            pkg.mSharedUserLabel = sa.getResourceId(
                    com.android.internal.R.styleable.AndroidManifest_sharedUserLabel, 0);
        }

        pkg.installLocation = sa.getInteger(
                com.android.internal.R.styleable.AndroidManifest_installLocation,
                PARSE_DEFAULT_INSTALL_LOCATION);
        pkg.applicationInfo.installLocation = pkg.installLocation;

        pkg.coreApp = attrs.getAttributeBooleanValue(null, "coreApp", false);

        sa.recycle();

        /* 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 */
        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;
            }

            String tagName = parser.getName();
            if (tagName.equals("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, attrs, flags, outError)) {
                    return null;
                }
            } else if (tagName.equals("overlay")) {
                pkg.mTrustedOverlay = trustedOverlay;

                sa = res.obtainAttributes(attrs,
                        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,
                        -1);
                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;
                }
                XmlUtils.skipCurrentTag(parser);

            } else if (tagName.equals("key-sets")) {
                if (!parseKeySets(pkg, res, parser, attrs, outError)) {
                    return null;
                }
            } else if (tagName.equals("permission-group")) {
                if (parsePermissionGroup(pkg, flags, res, parser, attrs, outError) == null) {
                    return null;
                }
            } else if (tagName.equals("permission")) {
                if (parsePermission(pkg, res, parser, attrs, outError) == null) {
                    return null;
                }
            } else if (tagName.equals("permission-tree")) {
                if (parsePermissionTree(pkg, res, parser, attrs, outError) == null) {
                    return null;
                }
            } else if (tagName.equals("uses-permission")) {
                if (!parseUsesPermission(pkg, res, parser, attrs)) {
                    return null;
                }
            } else if (tagName.equals("uses-permission-sdk-m")
                    || tagName.equals("uses-permission-sdk-23")) {
                if (!parseUsesPermission(pkg, res, parser, attrs)) {
                    return null;
                }
            } else if (tagName.equals("uses-configuration")) {
                ConfigurationInfo cPref = new ConfigurationInfo();
                sa = res.obtainAttributes(attrs,
                        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);

            } else if (tagName.equals("uses-feature")) {
                FeatureInfo fi = parseUsesFeature(res, attrs);
                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);

            } else if (tagName.equals("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, attrs);
                        // 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);

            } else if (tagName.equals("uses-sdk")) {
                if (SDK_VERSION > 0) {
                    sa = res.obtainAttributes(attrs,
                            com.android.internal.R.styleable.AndroidManifestUsesSdk);

                    int minVers = 0;
                    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 = minCode = val.string.toString();
                        } else {
                            // If it's not a string, it's an integer.
                            targetVers = val.data;
                        }
                    }

                    sa.recycle();

                    if (minCode != null) {
                        boolean allowedCodename = false;
                        for (String codename : SDK_CODENAMES) {
                            if (minCode.equals(codename)) {
                                allowedCodename = true;
                                break;
                            }
                        }
                        if (!allowedCodename) {
                            if (SDK_CODENAMES.length > 0) {
                                outError[0] = "Requires development platform " + minCode
                                        + " (current platform is any of "
                                        + Arrays.toString(SDK_CODENAMES) + ")";
                            } else {
                                outError[0] = "Requires development platform " + minCode
                                        + " but this is a release platform.";
                            }
                            mParseError = PackageManager.INSTALL_FAILED_OLDER_SDK;
                            return null;
                        }
                    } else if (minVers > SDK_VERSION) {
                        outError[0] = "Requires newer sdk version #" + minVers
                                + " (current version is #" + SDK_VERSION + ")";
                        mParseError = PackageManager.INSTALL_FAILED_OLDER_SDK;
                        return null;
                    }

                    if (targetCode != null) {
                        boolean allowedCodename = false;
                        for (String codename : SDK_CODENAMES) {
                            if (targetCode.equals(codename)) {
                                allowedCodename = true;
                                break;
                            }
                        }
                        if (!allowedCodename) {
                            if (SDK_CODENAMES.length > 0) {
                                outError[0] = "Requires development platform " + targetCode
                                        + " (current platform is any of "
                                        + Arrays.toString(SDK_CODENAMES) + ")";
                            } else {
                                outError[0] = "Requires development platform " + targetCode
                                        + " but this is a release platform.";
                            }
                            mParseError = PackageManager.INSTALL_FAILED_OLDER_SDK;
                            return null;
                        }
                        // If the code matches, it definitely targets this SDK.
                        pkg.applicationInfo.targetSdkVersion
                                = android.os.Build.VERSION_CODES.CUR_DEVELOPMENT;
                    } else {
                        pkg.applicationInfo.targetSdkVersion = targetVers;
                    }
                }

                XmlUtils.skipCurrentTag(parser);

            } else if (tagName.equals("supports-screens")) {
                sa = res.obtainAttributes(attrs,
                        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);

            } else if (tagName.equals("protected-broadcast")) {
                sa = res.obtainAttributes(attrs,
                        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);

            } else if (tagName.equals("instrumentation")) {
                if (parseInstrumentation(pkg, res, parser, attrs, outError) == null) {
                    return null;
                }

            } else if (tagName.equals("original-package")) {
                sa = res.obtainAttributes(attrs,
                        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);

            } else if (tagName.equals("adopt-permissions")) {
                sa = res.obtainAttributes(attrs,
                        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);

            } else if (tagName.equals("uses-gl-texture")) {
                // Just skip this tag
                XmlUtils.skipCurrentTag(parser);
                continue;

            } else if (tagName.equals("compatible-screens")) {
                // Just skip this tag
                XmlUtils.skipCurrentTag(parser);
                continue;
            } else if (tagName.equals("supports-input")) {
                XmlUtils.skipCurrentTag(parser);
                continue;

            } else if (tagName.equals("eat-comment")) {
                // Just skip this tag
                XmlUtils.skipCurrentTag(parser);
                continue;

            } 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;
            }
        }

        if (!foundApp && pkg.instrumentation.size() == 0) {
            outError[0] = "<manifest> does not contain an <application> or <instrumentation>";
            mParseError = PackageManager.INSTALL_PARSE_FAILED_MANIFEST_EMPTY;
        }

        final int NP = PackageParser.NEW_PERMISSIONS.length;
        StringBuilder implicitPerms = null;
        for (int ip=0; ip<NP; ip++) {
            final PackageParser.NewPermissionInfo npi
                    = PackageParser.NEW_PERMISSIONS[ip];
            if (pkg.applicationInfo.targetSdkVersion >= npi.sdkVersion) {
                break;
            }
            if (!pkg.requestedPermissions.contains(npi.name)) {
                if (implicitPerms == null) {
                    implicitPerms = new StringBuilder(128);
                    implicitPerms.append(pkg.packageName);
                    implicitPerms.append(": compat added ");
                } else {
                    implicitPerms.append(' ');
                }
                implicitPerms.append(npi.name);
                pkg.requestedPermissions.add(npi.name);
            }
        }
        if (implicitPerms != null) {
            Slog.i(TAG, implicitPerms.toString());
        }

        final int NS = PackageParser.SPLIT_PERMISSIONS.length;
        for (int is=0; i