android 卸载应用流程

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如果在手机中卸载会有提示卸载页面等，这个一般是 UninstallerActivity；在这里点击卸载调用的是下面代码：

ActivityThread.getPackageManager().getPackageInstaller().uninstall(new VersionedPackage(mDialogInfo.appInfo.packageName,PackageManager.VERSION_CODE_HIGHEST),getPackageName(), flags, pendingIntent.getIntentSender(),mDialogInfo.user.getIdentifier());

上面代码是IPC操作 getPackageManager() 为下面代码

    public static IPackageManager getPackageManager() {if (sPackageManager != null) {//Slog.v("PackageManager", "returning cur default = " + sPackageManager);return sPackageManager;}IBinder b = ServiceManager.getService("package");//Slog.v("PackageManager", "default service binder = " + b);sPackageManager = IPackageManager.Stub.asInterface(b);//Slog.v("PackageManager", "default service = " + sPackageManager);return sPackageManager;}

对应的IPackageManager 就是 PMS；所以调用的 PMS 中的 getPackageInstaller() ，代码如下：

    @Overridepublic IPackageInstaller getPackageInstaller() {if (getInstantAppPackageName(Binder.getCallingUid()) != null) {return null;}return mInstallerService;}

mInstallerService 为 PackageInstallerService ，所以看一下 PackageInstallerService 中的 uninstall() 方法

PackageInstallerService >> uninstall()

@Overrideprivate final PackageManagerService mPm;public void uninstall(VersionedPackage versionedPackage, String callerPackageName, int flags,IntentSender statusReceiver, int userId) throws RemoteException {// 先获取 UIDfinal int callingUid = Binder.getCallingUid();// 检查执行权限mPermissionManager.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.final int callingUserId = UserHandle.getUserId(callingUid);DevicePolicyManagerInternal dpmi =LocalServices.getService(DevicePolicyManagerInternal.class);final boolean isDeviceOwnerOrAffiliatedProfileOwner =dpmi != null && dpmi.isActiveAdminWithPolicy(callingUid,DeviceAdminInfo.USES_POLICY_PROFILE_OWNER)&& dpmi.isUserAffiliatedWithDevice(callingUserId);final PackageDeleteObserverAdapter adapter = new PackageDeleteObserverAdapter(mContext,statusReceiver, versionedPackage.getPackageName(),isDeviceOwnerOrAffiliatedProfileOwner, userId);if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DELETE_PACKAGES)== PackageManager.PERMISSION_GRANTED) {// Sweet, call straight through!// 调用 mPm mPm.deletePackageVersioned mPm.deletePackageVersioned(versionedPackage, adapter.getBinder(), userId, flags);} else if (isDeviceOwnerOrAffiliatedProfileOwner) {// Allow the device owner and affiliated profile owner to silently delete packages// Need to clear the calling identity to get DELETE_PACKAGES permissionlong ident = Binder.clearCallingIdentity();try {mPm.deletePackageVersioned(versionedPackage, adapter.getBinder(), userId, flags);} finally {Binder.restoreCallingIdentity(ident);}} else {// 需要和用户确认卸载消息ApplicationInfo appInfo = mPm.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 userfinal 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);}}

最后卸载调用了 mPm.deletePackageVersioned(versionedPackage, adapter.getBinder(), userId, flags); 所以走到了 PackageManagerService 的 deletePackageVersioned()

deletePackageVersioned() 主要功能

    @Overridepublic void deletePackageVersioned(VersionedPackage versionedPackage,final IPackageDeleteObserver2 observer, final int userId, final int deleteFlags) {// 获取 UIDfinal int callingUid = Binder.getCallingUid();// 检查权限mContext.enforceCallingOrSelfPermission(android.Manifest.permission.DELETE_PACKAGES, null);// 。。。// 。。。// 卸载应用是耗时的 所以开启异步线程mHandler.post(new Runnable() {public void run() {// 为了防止重复发送mHandler.removeCallbacks(this);int returnCode;// ...// ...// 最后就是调用了 deletePackageX returnCode = deletePackageX(internalPackageName, versionCode,userId, deleteFlags);});}

deletePackageX()

    int deletePackageX(String packageName, long versionCode, int userId, int deleteFlags) {final PackageRemovedInfo info = new PackageRemovedInfo(this);final boolean res;final int removeUser = (deleteFlags & PackageManager.DELETE_ALL_USERS) != 0? UserHandle.USER_ALL : userId;// 检查该用户是否有删除这个应用的权限if (isPackageDeviceAdmin(packageName, removeUser)) {Slog.w(TAG, "Not removing package " + packageName + ": has active device admin");return PackageManager.DELETE_FAILED_DEVICE_POLICY_MANAGER;}PackageSetting uninstalledPs = null;PackageParser.Package pkg = null;// for the uninstall-updates case and restricted profiles, remember the per-// user handle installed stateint[] allUsers;synchronized (mPackages) {// 获取应用在 mSettings 中的信息uninstalledPs = mSettings.mPackages.get(packageName);if (uninstalledPs == null) {return PackageManager.DELETE_FAILED_INTERNAL_ERROR;}if (versionCode != PackageManager.VERSION_CODE_HIGHEST&& uninstalledPs.versionCode != versionCode) {return PackageManager.DELETE_FAILED_INTERNAL_ERROR;}pkg = mPackages.get(packageName);allUsers = sUserManager.getUserIds();if (pkg != null && pkg.staticSharedLibName != null) {SharedLibraryEntry libEntry = getSharedLibraryEntryLPr(pkg.staticSharedLibName,pkg.staticSharedLibVersion);if (libEntry != null) {for (int currUserId : allUsers) {if (removeUser != UserHandle.USER_ALL && removeUser != currUserId) {continue;}List<VersionedPackage> libClientPackages = getPackagesUsingSharedLibraryLPr(libEntry.info, 0, currUserId);if (!ArrayUtils.isEmpty(libClientPackages)) {return PackageManager.DELETE_FAILED_USED_SHARED_LIBRARY;}}}}info.origUsers = uninstalledPs.queryInstalledUsers(allUsers, true);}final int freezeUser;if (isUpdatedSystemApp(uninstalledPs)&& ((deleteFlags & PackageManager.DELETE_SYSTEM_APP) == 0)) {freezeUser = UserHandle.USER_ALL;} else {freezeUser = removeUser;}synchronized (mInstallLock) {try (PackageFreezer freezer = freezePackageForDelete(packageName, freezeUser,deleteFlags, "deletePackageX")) {// 调用 deletePackageLIF 完成卸载应用res = deletePackageLIF(packageName, UserHandle.of(removeUser), true, allUsers,deleteFlags | PackageManager.DELETE_CHATTY, info, true, null);}synchronized (mPackages) {if (res) {if (pkg != null) {mInstantAppRegistry.onPackageUninstalledLPw(pkg, info.removedUsers);}updateSequenceNumberLP(uninstalledPs, info.removedUsers);updateInstantAppInstallerLocked(packageName);}}}if (res) {final boolean killApp = (deleteFlags & PackageManager.DELETE_DONT_KILL_APP) == 0;info.sendPackageRemovedBroadcasts(killApp);info.sendSystemPackageUpdatedBroadcasts();info.sendSystemPackageAppearedBroadcasts();}// Force a gc here.Runtime.getRuntime().gc();// Delete the resources here after sending the broadcast to let// other processes clean up before deleting resources.if (info.args != null) {synchronized (mInstallLock) {info.args.doPostDeleteLI(true);}}return res ? PackageManager.DELETE_SUCCEEDED : PackageManager.DELETE_FAILED_INTERNAL_ERROR;}

deletePackageLIF()

    private boolean deletePackageLIF(String packageName, UserHandle user,boolean deleteCodeAndResources, int[] allUserHandles, int flags,PackageRemovedInfo outInfo, boolean writeSettings,PackageParser.Package replacingPackage) {// ...// ...if (((!isSystemApp(ps) || (flags&PackageManager.DELETE_SYSTEM_APP) != 0) && user != null&& user.getIdentifier() != UserHandle.USER_ALL)) {// 调用者要求仅为单个用户删除包。// 为此，我们只需标记其已卸载状态并删除其数据。// 如果这是一个系统应用程序，只是标记状态和删除数据// 如果他们设置了特殊的DELETE_SYSTEM_APP，则将调用不同的方式卸载系统app// 设置一些状态属性markPackageUninstalledForUserLPw(ps, user);// 判断是不是系统 appif (!isSystemApp(ps)) {// Do not uninstall the APK if an app should be cachedboolean keepUninstalledPackage = shouldKeepUninstalledPackageLPr(packageName);// 如果调用者只要求卸载某个用户下的应用if (ps.isAnyInstalled(sUserManager.getUserIds()) || keepUninstalledPackage) {// Other user still have this package installed, so all// we need to do is clear this user's data and save that// it is uninstalled.// 其他用户仍然安装了这个包，所以我们需要做的就是清除该用户的数据，并将其保存为已卸载。if (DEBUG_REMOVE) Slog.d(TAG, "Still installed by other users");if (!clearPackageStateForUserLIF(ps, user.getIdentifier(), outInfo)) {return false;}scheduleWritePackageRestrictionsLocked(user);return true;} else {// We need to set it back to 'installed' so the uninstall// broadcasts will be sent correctly.if (DEBUG_REMOVE) Slog.d(TAG, "Not installed by other users, full delete");ps.setInstalled(true, user.getIdentifier());mSettings.writeKernelMappingLPr(ps);}} else {// This is a system app, so we assume that the// other users still have this package installed, so all// we need to do is clear this user's data and save that// it is uninstalled.// 如果是系统应用程序，因此我们假设其他用户仍然安装了这个包，因此我们需要做的就是清除该用户的数据，并保存为已卸载。if (DEBUG_REMOVE) Slog.d(TAG, "Deleting system app");if (!clearPackageStateForUserLIF(ps, user.getIdentifier(), outInfo)) {return false;}scheduleWritePackageRestrictionsLocked(user);return true;}}// 安装的时候有安装包集 卸载也一样 查看packageSetting 下是否是复合包if (ps.childPackageNames != null && outInfo != null) {synchronized (mPackages) {final int childCount = ps.childPackageNames.size();outInfo.removedChildPackages = new ArrayMap<>(childCount);for (int i = 0; i < childCount; i++) {String childPackageName = ps.childPackageNames.get(i);PackageRemovedInfo childInfo = new PackageRemovedInfo(this);childInfo.removedPackage = childPackageName;childInfo.installerPackageName = ps.installerPackageName;outInfo.removedChildPackages.put(childPackageName, childInfo);PackageSetting childPs = mSettings.getPackageLPr(childPackageName);if (childPs != null) {childInfo.origUsers = childPs.queryInstalledUsers(allUserHandles, true);}}}}boolean ret = false;if (isSystemApp(ps)) {if (DEBUG_REMOVE) Slog.d(TAG, "Removing system package: " + ps.name);// 当一个更新的系统应用程序被删除时，我们也会删除现有的资源 设置一下分区ret = deleteSystemPackageLIF(ps.pkg, ps, allUserHandles, flags, outInfo, writeSettings);} else {// kill app ； 删除非系统的包和资源 ；删除各种缓存 和 为package.xml  packageSetting 修改对应的数据等ret = deleteInstalledPackageLIF(ps, deleteCodeAndResources, flags, allUserHandles,outInfo, writeSettings, replacingPackage);}// ...// ...}

整体流程是根据不用用户删除app和数据；包括 package 和 PMS 等缓存数据等。

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android 卸载应用流程

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