在android 5.0 專案上開發的時候，進入U盤目錄，通過pm 命令安裝apk，發現安裝失敗，提示apk路徑不對。

安裝log資訊如下：

cd /mnt/usb/2D80-E3ED/APK_backup

[email protected]:/mnt/usb/2D80-E3ED/APK_backup # pm install AndyKeyTest.apk       
        pkg: AndyKeyTest.apk
Failure [INSTALL_FAILED_INVALID_URI]

logcat資訊：

01-01 08:20:49.955 D/AndroidRuntime( 2952): Calling main entry com.android.commands.pm.Pm
01-01 08:20:49.968 W/asset   ( 2734): Asset path /AndyKeyTest.apk is neither a directory nor file (type=1).
--------- beginning of system
01-01 08:20:49.968 W/DefContainer( 2734): Failed to parse package at /AndyKeyTest.apk: android.content.pm.PackageParser$PackageParserException: Failed to parse /AndyKeyTest.apk

通過log資訊及測試發現，原來在android5.0中不能直接在u盤目錄下執行pm install 安裝apk ，必須到要在pm 命令帶上apk所在路勁。更早的android版本沒有這個要求

改為在根目錄下，執行下面命令，則安裝apk成功

[email protected]:/ # pm install mnt/usb/2D80-E3ED/APK_backup/AndyKeyTest.apk 
       pkg: mnt/usb/2D80-E3ED/APK_backup/AndyKeyTest.apk
Success

針對上面的問題，查看了一下原始碼，發現android 5.0 的parsePackage功能在細節上有一些更改，所以出現上面的情況。

相關程式碼如下：

[email protected]

    /**
     * Parse only lightweight details about the package at the given location.
     * Automatically detects if the package is a monolithic style (single APK
     * file) or cluster style (directory of APKs).
     * <p>
     * This performs sanity checking on cluster style packages, such as
     * requiring identical package name and version codes, a single base APK,
     * and unique split names.
     *
     * @see PackageParser#parsePackage(File, int)
     */
    public static PackageLite parsePackageLite(File packageFile, int flags)
            throws PackageParserException {
        if (packageFile.isDirectory()) {
            return parseClusterPackageLite(packageFile, flags);
        } else {
            return parseMonolithicPackageLite(packageFile, flags);
        }
    }

[email protected]

        /**
         * Parse given package and return minimal details.
         *
         * @param packagePath absolute path to the package to be copied. Can be
         *            a single monolithic APK file or a cluster directory
         *            containing one or more APKs.
         */
        @Override
        public PackageInfoLite getMinimalPackageInfo(String packagePath, int flags,
                String abiOverride) {
            final Context context = DefaultContainerService.this;
            final boolean isForwardLocked = (flags & PackageManager.INSTALL_FORWARD_LOCK) != 0;

            PackageInfoLite ret = new PackageInfoLite();
            if (packagePath == null) {
                Slog.i(TAG, "Invalid package file " + packagePath);
                ret.recommendedInstallLocation = PackageHelper.RECOMMEND_FAILED_INVALID_APK;
                return ret;
            }

            final File packageFile = new File(packagePath);
            final PackageParser.PackageLite pkg;
            final long sizeBytes;
            try {
                pkg = PackageParser.parsePackageLite(packageFile, 0);
                sizeBytes = PackageHelper.calculateInstalledSize(pkg, isForwardLocked, abiOverride);
            } catch (PackageParserException | IOException e) {
                Slog.w(TAG, "Failed to parse package at " + packagePath + ": " + e);

                if (!packageFile.exists()) {
                    ret.recommendedInstallLocation = PackageHelper.RECOMMEND_FAILED_INVALID_URI;
                } else {
                    ret.recommendedInstallLocation = PackageHelper.RECOMMEND_FAILED_INVALID_APK;
                }

                return ret;
            }

            ret.packageName = pkg.packageName;
            ret.versionCode = pkg.versionCode;
            ret.installLocation = pkg.installLocation;
            ret.verifiers = pkg.verifiers;
            ret.recommendedInstallLocation = PackageHelper.resolveInstallLocation(context,
                    pkg.packageName, pkg.installLocation, sizeBytes, flags);
            ret.multiArch = pkg.multiArch;

            return ret;
        }