安卓系统应用的卸载和恢复(非data分区)

本文最后更新于：2023年5月3日 晚上

安卓系统应用的卸载和恢复(非data分区)

Uninstall and Restore Android System Apps (non-data partition)

网上已经有很多预装应用卸载的方法了，但是他们基本都是设法在第一次开机的时候安装到data分区。

本文需要达到的目标是预装在system分区的应用能够被卸载，且能恢复安装。

命令行方法

安卓5.0开始可以针对用户卸载系统应用

卸载系统应用

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adb shell pm uninstall -k --user 0 app包名

-k是是否需要保留数据，可以不加。

恢复系统应用

安卓7开始才可以通过命令恢复

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adb shell cmd package install-existing app包名

代码方法

代码分析(基于目前aosp master分支最新代码)

卸载

com/android/server/pm/PackageManagerShellCommand.java

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private int runUninstall() throws RemoteException {
        final PrintWriter pw = getOutPrintWriter();
        int flags = 0;
        int userId = UserHandle.USER_ALL;
        long versionCode = PackageManager.VERSION_CODE_HIGHEST;

        String opt;
        while ((opt = getNextOption()) != null) {
            switch (opt) {
                case "-k":
                    flags |= PackageManager.DELETE_KEEP_DATA;
                    break;
                case "--user":
                    userId = UserHandle.parseUserArg(getNextArgRequired());
                    break;
                case "--versionCode":
                    versionCode = Long.parseLong(getNextArgRequired());
                    break;
                default:
                    pw.println("Error: Unknown option: " + opt);
                    return 1;
            }
        }

        final String packageName = getNextArg();
        if (packageName == null) {
            pw.println("Error: package name not specified");
            return 1;
        }

        / if a split is specified, just remove it and not the whole package
        ArrayList<String> splitNames = getRemainingArgs();
        if (!splitNames.isEmpty()) {
            return runRemoveSplits(packageName, splitNames);
        }
        // 不加--user是卸载所有用户的应用
        if (userId == UserHandle.USER_ALL) {
            flags |= PackageManager.DELETE_ALL_USERS;
        }
        final int translatedUserId =
                translateUserId(userId, UserHandle.USER_SYSTEM, "runUninstall");
        final LocalIntentReceiver receiver = new LocalIntentReceiver();
        final PackageManagerInternal internal =
                LocalServices.getService(PackageManagerInternal.class);

        if (internal.isApexPackage(packageName)) {
            internal.uninstallApex(
                    packageName, versionCode, translatedUserId, receiver.getIntentSender(), flags);
        } else {
            //如果删除某一个用户的应用，走这里
            if ((flags & PackageManager.DELETE_ALL_USERS) == 0) {
                final PackageInfo info = mInterface.getPackageInfo(packageName,
                        PackageManager.MATCH_STATIC_SHARED_AND_SDK_LIBRARIES, translatedUserId);
                if (info == null) {
                    pw.println("Failure [not installed for " + translatedUserId + "]");
                    return 1;
                }
                final boolean isSystem =
                        (info.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0;
                // If we are being asked to delete a system app for just one
                // user set flag so it disables rather than reverting to system
                // version of the app.
                if (isSystem) {
                    flags |= PackageManager.DELETE_SYSTEM_APP;
                }
            }
            mInterface.getPackageInstaller().uninstall(new VersionedPackage(packageName,
                            versionCode), null /*callerPackageName*/, flags,
                    receiver.getIntentSender(), translatedUserId);
        }

        final Intent result = receiver.getResult();
        final int status = result.getIntExtra(PackageInstaller.EXTRA_STATUS,
                PackageInstaller.STATUS_FAILURE);
        if (status == PackageInstaller.STATUS_SUCCESS) {
            pw.println("Success");
            return 0;
        } else {
            pw.println("Failure ["
                    + result.getStringExtra(PackageInstaller.EXTRA_STATUS_MESSAGE) + "]");
            return 1;
        }
    }

android/content/pm/PackageInstaller.java

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/**
     * Uninstall the given package with a specific version code, removing it
     * completely from the device. If the version code of the package
     * does not match the one passed in the versioned package argument this
     * method is a no-op. Use {@link PackageManager#VERSION_CODE_HIGHEST} to
     * uninstall the latest version of the package.
     * <p>
     * This method is available to:
     * <ul>
     * <li>the current "installer of record" for the package
     * <li>the device owner
     * <li>the affiliated profile owner
     * </ul>
     *
     * @param versionedPackage The versioned package to uninstall.
     * @param statusReceiver Where to deliver the result.
     *
     * @see android.app.admin.DevicePolicyManager
     */
    @RequiresPermission(anyOf = {
            Manifest.permission.DELETE_PACKAGES,
            Manifest.permission.REQUEST_DELETE_PACKAGES})
    public void uninstall(@NonNull VersionedPackage versionedPackage,
            @NonNull IntentSender statusReceiver) {
        uninstall(versionedPackage, 0 /*flags*/, statusReceiver);
    }

    /**
     * Uninstall the given package with a specific version code, removing it
     * completely from the device. This method is only available to the current
     * "installer of record" for the package. If the version code of the package
     * does not match the one passed in the versioned package argument this
     * method is a no-op. Use {@link PackageManager#VERSION_CODE_HIGHEST} to
     * uninstall the latest version of the package.
     *
     * @param versionedPackage The versioned package to uninstall.
     * @param flags Flags for uninstall.
     * @param statusReceiver Where to deliver the result.
     *
     * @hide
     */
    @RequiresPermission(anyOf = {
            Manifest.permission.DELETE_PACKAGES,
            Manifest.permission.REQUEST_DELETE_PACKAGES})
    public void uninstall(@NonNull VersionedPackage versionedPackage, @DeleteFlags int flags,
            @NonNull IntentSender statusReceiver) {
        Objects.requireNonNull(versionedPackage, "versionedPackage cannot be null");
        try {
            //binder调用
            mInstaller.uninstall(versionedPackage, mInstallerPackageName,
                    flags, statusReceiver, mUserId);
        } catch (RemoteException e) {
            throw e.rethrowFromSystemServer();
        }
    }

com/android/server/pm/PackageInstallerService.java

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@Override
    public void uninstall(VersionedPackage versionedPackage, String callerPackageName, int flags,
                IntentSender statusReceiver, int userId) {
        final Computer snapshot = mPm.snapshotComputer();
        final int callingUid = Binder.getCallingUid();
        snapshot.enforceCrossUserPermission(callingUid, userId, true, true, "uninstall");
        if ((callingUid != Process.SHELL_UID) && (callingUid != Process.ROOT_UID)) {
            mAppOps.checkPackage(callingUid, callerPackageName);
        }

        // Check whether the caller is device owner or affiliated profile owner, in which case we do
        // it silently.
        DevicePolicyManagerInternal dpmi =
                LocalServices.getService(DevicePolicyManagerInternal.class);
        final boolean canSilentlyInstallPackage =
                dpmi != null && dpmi.canSilentlyInstallPackage(callerPackageName, callingUid);

        final PackageDeleteObserverAdapter adapter = new PackageDeleteObserverAdapter(mContext,
                statusReceiver, versionedPackage.getPackageName(),
                canSilentlyInstallPackage, userId);
        if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DELETE_PACKAGES)
                    == PackageManager.PERMISSION_GRANTED) {
            // Sweet, call straight through!
            mPm.deletePackageVersioned(versionedPackage, adapter.getBinder(), userId, flags);
        } else if (canSilentlyInstallPackage) {
            // Allow the device owner and affiliated profile owner to silently delete packages
            // Need to clear the calling identity to get DELETE_PACKAGES permission
            final long ident = Binder.clearCallingIdentity();
            try {
                mPm.deletePackageVersioned(versionedPackage, adapter.getBinder(), userId, flags);
            } finally {
                Binder.restoreCallingIdentity(ident);
            }
            DevicePolicyEventLogger
                    .createEvent(DevicePolicyEnums.UNINSTALL_PACKAGE)
                    .setAdmin(callerPackageName)
                    .write();
        } else {
            ApplicationInfo appInfo = snapshot.getApplicationInfo(callerPackageName, 0, userId);
            if (appInfo.targetSdkVersion >= Build.VERSION_CODES.P) {
                mContext.enforceCallingOrSelfPermission(Manifest.permission.REQUEST_DELETE_PACKAGES,
                        null);
            }

            // Take a short detour to confirm with user
            final Intent intent = new Intent(Intent.ACTION_UNINSTALL_PACKAGE);
            intent.setData(Uri.fromParts("package", versionedPackage.getPackageName(), null));
            intent.putExtra(PackageInstaller.EXTRA_CALLBACK, adapter.getBinder().asBinder());
            adapter.onUserActionRequired(intent);
        }
    }

com/android/server/pm/IPackageManagerBase.java

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@Override
    @Deprecated
    public final void deletePackageAsUser(String packageName, int versionCode,
                                          IPackageDeleteObserver observer, int userId, int flags) {
        deletePackageVersioned(new VersionedPackage(packageName, versionCode),
                               new PackageManager.LegacyPackageDeleteObserver(observer).getBinder(), userId,
                               flags);
    }
恢复安装

com/android/server/pm/PackageManagerShellCommand.java

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private int runInstallExisting() throws RemoteException {
        final PrintWriter pw = getOutPrintWriter();
        int userId = UserHandle.USER_CURRENT;
        int installFlags = PackageManager.INSTALL_ALL_WHITELIST_RESTRICTED_PERMISSIONS;
        String opt;
        boolean waitTillComplete = false;
        while ((opt = getNextOption()) != null) {
            switch (opt) {
                case "--user":
                    userId = UserHandle.parseUserArg(getNextArgRequired());
                    break;
                case "--ephemeral":
                case "--instant":
                    installFlags |= PackageManager.INSTALL_INSTANT_APP;
                    installFlags &= ~PackageManager.INSTALL_FULL_APP;
                    break;
                case "--full":
                    installFlags &= ~PackageManager.INSTALL_INSTANT_APP;
                    installFlags |= PackageManager.INSTALL_FULL_APP;
                    break;
                case "--wait":
                    waitTillComplete = true;
                    break;
                case "--restrict-permissions":
                    installFlags &= ~PackageManager.INSTALL_ALL_WHITELIST_RESTRICTED_PERMISSIONS;
                    break;
                default:
                    pw.println("Error: Unknown option: " + opt);
                    return 1;
            }
        }

        final String packageName = getNextArg();
        if (packageName == null) {
            pw.println("Error: package name not specified");
            return 1;
        }
        final int translatedUserId =
                translateUserId(userId, UserHandle.USER_NULL, "runInstallExisting");

        int installReason = PackageManager.INSTALL_REASON_UNKNOWN;
        try {
            if (waitTillComplete) {
                final LocalIntentReceiver receiver = new LocalIntentReceiver();
                final IPackageInstaller installer = mInterface.getPackageInstaller();
                pw.println("Installing package " + packageName + " for user: " + translatedUserId);
                installer.installExistingPackage(packageName, installFlags, installReason,
                        receiver.getIntentSender(), translatedUserId, null);
                final Intent result = receiver.getResult();
                final int status = result.getIntExtra(PackageInstaller.EXTRA_STATUS,
                        PackageInstaller.STATUS_FAILURE);
                pw.println("Received intent for package install");
                return status == PackageInstaller.STATUS_SUCCESS ? 0 : 1;
            }
         //走这里
            final int res = mInterface.installExistingPackageAsUser(packageName, translatedUserId,
                    installFlags, installReason, null);
            if (res == PackageManager.INSTALL_FAILED_INVALID_URI) {
                throw new NameNotFoundException("Package " + packageName + " doesn't exist");
            }
            pw.println("Package " + packageName + " installed for user: " + translatedUserId);
            return 0;
        } catch (RemoteException | NameNotFoundException e) {
            pw.println(e.toString());
            return 1;
        }
    }

系统应用反射调用接口进行卸载和恢复

虽然命令从安卓5.0才开始支持，但接口应该是从安卓4.2（支持多用户）就开始支持了：

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//安卓8以前
public void deletePackageAsUser(final String packageName,
                                    final IPackageDeleteObserver observer,
                                    final int userId, final int flags) 

public int installExistingPackageAsUser(String packageName, int userId) 

//安卓8开始
public void deletePackageAsUser(String packageName, int versionCode, IPackageDeleteObserver observer, int userId, int flags) 

public int installExistingPackageAsUser(String packageName, int userId, int installFlags,int installReason)

怎么做

系统应用可以通过android.content.pm.IPackageManager$Stub反射分别获得deletePackageAsUser和installExistingPackageAsUser，前者可以卸载，后者可以恢复安装。恢复安装之前可以通过packageManager.getApplicationInfo判断系统是否还存在安装包，否则可以跳应用商店进行安装。

注意：

1、deletePackageAsUser会清除数据，但不会卸载更新。即如果系统应用更新后，会存在两个apk，一个在system分区，一个在data分区。

如果要删除data下的更新，可以先调用卸载接口再调用deletePackageAsUser。

2、/data/dalvik-cache/下面会残留dex文件，可以扫描删除。

AndroidFrameworkFeature
#Android #PackageMangerService
安卓系统应用的卸载和恢复(非data分区)
https://iwesley.top/article/5867f171/
作者
Wesley
发布于
2023年5月3日
许可协议