Android6.0 PKMS扫描目录和调用接口安装应用的区别

Android安装应用分两种，一种是直接调用PKMS的接口安装，另一种是扫描目录安装，比如系统开机的时候会扫描data/app目录进行安装。

一、调用installPackageAsUser函数安装

我们先来看调用接口应用安装应用，都会通过如下函数，这个函数先会通过传进来的uid来判断是否是adb安装的，然后创建了一个InstallParams对象这个对象是HandlerParams的子类，然后发送消息。

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@Override
public void installPackageAsUser(String originPath, IPackageInstallObserver2 observer,
int installFlags, String installerPackageName, VerificationParams verificationParams,
String packageAbiOverride, int userId) {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.INSTALL_PACKAGES, null);

final int callingUid = Binder.getCallingUid();
enforceCrossUserPermission(callingUid, userId, true, true, "installPackageAsUser");

if (isUserRestricted(userId, UserManager.DISALLOW_INSTALL_APPS)) {
try {
if (observer != null) {
observer.onPackageInstalled("", INSTALL_FAILED_USER_RESTRICTED, null, null);
}
} catch (RemoteException re) {
}
return;
}

if ((callingUid == Process.SHELL_UID) || (callingUid == Process.ROOT_UID)) {
installFlags |= PackageManager.INSTALL_FROM_ADB;//根据uid来判断是否是adb安装的

} else {
// Caller holds INSTALL_PACKAGES permission, so we're less strict
// about installerPackageName.

installFlags &= ~PackageManager.INSTALL_FROM_ADB;
installFlags &= ~PackageManager.INSTALL_ALL_USERS;
}

UserHandle user;
if ((installFlags & PackageManager.INSTALL_ALL_USERS) != 0) {
user = UserHandle.ALL;
} else {
user = new UserHandle(userId);
}

// Only system components can circumvent runtime permissions when installing.
if ((installFlags & PackageManager.INSTALL_GRANT_RUNTIME_PERMISSIONS) != 0
&& mContext.checkCallingOrSelfPermission(Manifest.permission
.INSTALL_GRANT_RUNTIME_PERMISSIONS) == PackageManager.PERMISSION_DENIED) {
throw new SecurityException("You need the "
+ "android.permission.INSTALL_GRANT_RUNTIME_PERMISSIONS permission "
+ "to use the PackageManager.INSTALL_GRANT_RUNTIME_PERMISSIONS flag");
}

verificationParams.setInstallerUid(callingUid);

final File originFile = new File(originPath);
final OriginInfo origin = OriginInfo.fromUntrustedFile(originFile);

final Message msg = mHandler.obtainMessage(INIT_COPY);
InstallParams installParams = new InstallParams(origin, null, observer, installFlags, installerPackageName,
null, verificationParams, user, packageAbiOverride, null);
installParams.setHandlerType(HandlerParams.INSTALL_TYPE);
msg.obj = installParams;
mHandler.sendMessage(msg);//发送消息
}

1.1 adb install

普通的安装我们就调用这个接口，我们来看下adb install又是如何实现的。

我们来看下adb中Commandline.cpp中的如下代码，就是执行adb install命令的。

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static int install_app(transport_type transport, const char* serial, int argc,
const char** argv)
{
static const char *const DATA_DEST = "/data/local/tmp/%s";
static const char *const SD_DEST = "/sdcard/tmp/%s";
const char* where = DATA_DEST;
int i;
struct stat sb;

for (i = 1; i < argc; i++) {
if (!strcmp(argv[i], "-s")) {
where = SD_DEST;
}
}

// Find last APK argument.
// All other arguments passed through verbatim.
int last_apk = -1;
for (i = argc - 1; i >= 0; i--) {
const char* file = argv[i];
char* dot = strrchr(file, '.');
if (dot && !strcasecmp(dot, ".apk")) {
if (stat(file, &sb) == -1 || !S_ISREG(sb.st_mode)) {
fprintf(stderr, "Invalid APK file: %s\n", file);
return -1;
}

last_apk = i;
break;
}
}

if (last_apk == -1) {
fprintf(stderr, "Missing APK file\n");
return -1;
}

const char* apk_file = argv[last_apk];
char apk_dest[PATH_MAX];
snprintf(apk_dest, sizeof apk_dest, where, get_basename(apk_file));
int err = do_sync_push(apk_file, apk_dest, 0 /* no show progress */);//先push apk文件
if (err) {
goto cleanup_apk;
} else {
argv[last_apk] = apk_dest; /* destination name, not source location */
}

err = pm_command(transport, serial, argc, argv);//调用pm命令

cleanup_apk:
delete_file(transport, serial, apk_dest);//删除文件
return err;
}

上面函数先是把apk文件push到data/local/tmp下面，然后调用pm命令，最后完成之后再删除文件。

下面我们分别看下几个函数。

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static int pm_command(transport_type transport, const char* serial,
int argc, const char** argv)
{
std::string cmd = "shell:pm";

while (argc-- > 0) {
cmd += " " + escape_arg(*argv++);
}

return send_shell_command(transport, serial, cmd);
}

删除就是调用了adb shell rm命令。

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static int delete_file(transport_type transport, const char* serial, char* filename)
{
std::string cmd = "shell:rm -f " + escape_arg(filename);
return send_shell_command(transport, serial, cmd);
}

我们再看下PM命令，是在Pm.Java文件中，最后也是调用了installPackageAsUser函数，这个我们就不看了。下面继续分析installPackageAsUser函数。

1.2 MCS_BOUND

上面分析到发送一个INIT_COPY消息，我们再来看下消息处理。

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case INIT_COPY: {
HandlerParams params = (HandlerParams) msg.obj;
int idx = mPendingInstalls.size();
if (DEBUG_INSTALL) Slog.i(TAG, "init_copy idx=" + idx + ": " + params);
// If a bind was already initiated we dont really
// need to do anything. The pending install
// will be processed later on.
if (!mBound) {
// If this is the only one pending we might
// have to bind to the service again.
if (!connectToService()) {
Slog.e(TAG, "Failed to bind to media container service");
params.serviceError();
return;
} else {
// Once we bind to the service, the first
// pending request will be processed.
mPendingInstalls.add(idx, params);
}
} else {
mPendingInstalls.add(idx, params);
// Already bound to the service. Just make
// sure we trigger off processing the first request.
if (idx == 0) {
mHandler.sendEmptyMessage(MCS_BOUND);
}
}
break;
}

消息处理先要看mBound是否为true，为true代表DefaultContainerService连接上了（这个service后续需要copy apk等文件的），这个时候会发送一个MCS_BOUND消息。我们先等等看这个消息的处理。这里如果mBound是false，就要调用connectToService函数。

我们来看这个函数，就是调用BindService来启动一个Service

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private boolean connectToService() {
if (DEBUG_SD_INSTALL) Log.i(TAG, "Trying to bind to" +
" DefaultContainerService");
Intent service = new Intent().setComponent(DEFAULT_CONTAINER_COMPONENT);
Process.setThreadPriority(Process.THREAD_PRIORITY_DEFAULT);
if (mContext.bindServiceAsUser(service, mDefContainerConn,
Context.BIND_AUTO_CREATE, UserHandle.OWNER)) {
Process.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND);
mBound = true;
return true;
}
Process.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND);
return false;
}

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static final ComponentName DEFAULT_CONTAINER_COMPONENT = new ComponentName(
DEFAULT_CONTAINER_PACKAGE,
"com.android.defcontainer.DefaultContainerService");

我们再来看Connection，连接上之后会把这个Service的Binder对象IMediaContainerService ，发送一个MCS_BOUND消息。

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final private DefaultContainerConnection mDefContainerConn =
new DefaultContainerConnection();
class DefaultContainerConnection implements ServiceConnection {
public void onServiceConnected(ComponentName name, IBinder service) {
if (DEBUG_SD_INSTALL) Log.i(TAG, "onServiceConnected");
IMediaContainerService imcs =
IMediaContainerService.Stub.asInterface(service);
mHandler.sendMessage(mHandler.obtainMessage(MCS_BOUND, imcs));
}

public void onServiceDisconnected(ComponentName name) {
if (DEBUG_SD_INSTALL) Log.i(TAG, "onServiceDisconnected");
}
}

现在我们再来看这个消息处理。其实这个函数主要就是调用了调用HandlerParams的startCopy函数，其他就是判断Service是否断开，是否mPendingInstalls还有其他没有安装的应用等处理。

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case MCS_BOUND: {
if (DEBUG_INSTALL) Slog.i(TAG, "mcs_bound");
if (msg.obj != null) {
mContainerService = (IMediaContainerService) msg.obj;
}
if (mContainerService == null) {
if (!mBound) {
// Something seriously wrong since we are not bound and we are not
// waiting for connection. Bail out.
Slog.e(TAG, "Cannot bind to media container service");
for (HandlerParams params : mPendingInstalls) {
// Indicate service bind error
params.serviceError();
}
mPendingInstalls.clear();
} else {
Slog.w(TAG, "Waiting to connect to media container service");
}
} else if (mPendingInstalls.size() > 0) {
HandlerParams params = mPendingInstalls.get(0);
if (params != null) {
if (params.startCopy()) {//调用HandlerParams的startCopy函数
// We are done... look for more work or to
// go idle.
if (DEBUG_SD_INSTALL) Log.i(TAG,
"Checking for more work or unbind...");
// Delete pending install
if (mPendingInstalls.size() > 0) {
mPendingInstalls.remove(0);
}
if (mPendingInstalls.size() == 0) {
if (mBound) {
if (DEBUG_SD_INSTALL) Log.i(TAG,
"Posting delayed MCS_UNBIND");
removeMessages(MCS_UNBIND);
Message ubmsg = obtainMessage(MCS_UNBIND);
// Unbind after a little delay, to avoid
// continual thrashing.
sendMessageDelayed(ubmsg, 10000);
}
} else {
// There are more pending requests in queue.
// Just post MCS_BOUND message to trigger processing
// of next pending install.
if (DEBUG_SD_INSTALL) Log.i(TAG,
"Posting MCS_BOUND for next work");
mHandler.sendEmptyMessage(MCS_BOUND);
}
}
}
} else {
// Should never happen ideally.
Slog.w(TAG, "Empty queue");
}
break;
}

1.3 startCopy

我们来看下面这个函数，如果超过4次出错，直接发送一个MCS_GIVE_UP消息，这个消息里面会调用mPendingInstalls.remove(0);把mPendingInstalls中第一项去除（就是去除第一个要安装的应用），当我们成功安装完在MCS_BOUND也会将第一个去除的。

当然正常的是调用handleStartCopy函数，只有出现RemoteException的是否才会返回false，代表这个copy不成功，也就不会remove这项应用信息。下次还会再调调用startCopy函数继续处理。

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final boolean startCopy() {
boolean res;
try {
if (DEBUG_INSTALL) Slog.i(TAG, "startCopy " + mUser + ": " + this);

if (++mRetries > MAX_RETRIES) {//如果安装没有成功，超过4次。错误处理
Slog.w(TAG, "Failed to invoke remote methods on default container service. Giving up");
mHandler.sendEmptyMessage(MCS_GIVE_UP);
handleServiceError();
return false;
} else {
handleStartCopy();
res = true;
}
} catch (RemoteException e) {
if (DEBUG_INSTALL) Slog.i(TAG, "Posting install MCS_RECONNECT");
mHandler.sendEmptyMessage(MCS_RECONNECT);
res = false;
}
handleReturnCode();
return res;
}

我们先看下handleServiceError函数，也像handleStartCopy会调用createInstallArgs，创建一个InstallArgs，然后mRet为失败的。这些后面在处理processPendingInstall函数的时候需要

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@Override
void handleServiceError() {
mArgs = createInstallArgs(this);
mRet = PackageManager.INSTALL_FAILED_INTERNAL_ERROR;
}

我们再来看看handleStartCopy函数，先会调用createInstallArgs来创建一个InstallArgs，这里只是一个基类而已，然后会调用InstallArgs的copyApk函数，来copy apk文件到data/app下面.

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public void handleStartCopy() throws RemoteException {
int ret = PackageManager.INSTALL_SUCCEEDED;
......
final InstallArgs args = createInstallArgs(this);
mArgs = args;
......
else {
/*
* No package verification is enabled, so immediately start
* the remote call to initiate copy using temporary file.
*/
ret = args.copyApk(mContainerService, true);
}
}

mRet = ret;
}

我们先来看下createInstallArgs函数，根据InstallParams来创建不同的InstallArgs，这里我们只关心FileInstallArgs。

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private InstallArgs createInstallArgs(InstallParams params) {
if (params.move != null) {
return new MoveInstallArgs(params);
} else if (installOnExternalAsec(params.installFlags) || params.isForwardLocked()) {
return new AsecInstallArgs(params);
} else {
return new FileInstallArgs(params);
}
}

我们来看下FileInstallArgs 的copyApk函数，先是调用PackageInstallerService的allocateStageDirLegacy函数来创建一个目录，然后调用ImediaContainerService binder调用copyPackage函数，这个就是之前的DefaultContainerService。

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int copyApk(IMediaContainerService imcs, boolean temp) throws RemoteException {
if (origin.staged) {
if (DEBUG_INSTALL) Slog.d(TAG, origin.file + " already staged; skipping copy");
codeFile = origin.file;
resourceFile = origin.file;
return PackageManager.INSTALL_SUCCEEDED;
}

try {
final File tempDir = mInstallerService.allocateStageDirLegacy(volumeUuid);
codeFile = tempDir;
resourceFile = tempDir;
} catch (IOException e) {
Slog.w(TAG, "Failed to create copy file: " + e);
return PackageManager.INSTALL_FAILED_INSUFFICIENT_STORAGE;
}

final IParcelFileDescriptorFactory target = new IParcelFileDescriptorFactory.Stub() {
@Override
public ParcelFileDescriptor open(String name, int mode) throws RemoteException {
if (!FileUtils.isValidExtFilename(name)) {
throw new IllegalArgumentException("Invalid filename: " + name);
}
try {
final File file = new File(codeFile, name);
final FileDescriptor fd = Os.open(file.getAbsolutePath(),
O_RDWR | O_CREAT, 0644);
Os.chmod(file.getAbsolutePath(), 0644);
return new ParcelFileDescriptor(fd);
} catch (ErrnoException e) {
throw new RemoteException("Failed to open: " + e.getMessage());
}
}
};

int ret = PackageManager.INSTALL_SUCCEEDED;
ret = imcs.copyPackage(origin.file.getAbsolutePath(), target);
if (ret != PackageManager.INSTALL_SUCCEEDED) {
Slog.e(TAG, "Failed to copy package");
return ret;
}

final File libraryRoot = new File(codeFile, LIB_DIR_NAME);
NativeLibraryHelper.Handle handle = null;
try {
handle = NativeLibraryHelper.Handle.create(codeFile);
ret = NativeLibraryHelper.copyNativeBinariesWithOverride(handle, libraryRoot,
abiOverride);
} catch (IOException e) {
Slog.e(TAG, "Copying native libraries failed", e);
ret = PackageManager.INSTALL_FAILED_INTERNAL_ERROR;
} finally {
IoUtils.closeQuietly(handle);
}

return ret;
}

这里的data/app下的临时文件我们来看下是怎么样的

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# ls
IflytekInput.apk
MOffice.apk
NotePadPlus.apk
vmdl202298311.tmp

这里vmdl202298311.tmp只是一个目录，下面还有base.apk 和lib，lib也是一个目录里面还有各个so文件

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base.apk
lib

这里就完成了将apk copy到data/app下面的临时目录中。

1.4 processPendingInstall函数

然后在startCopy函数中又会调用handleReturnCode函数，这里就是调用了processPendingInstall函数，注意参数mRett就是之前调用copyApk的返回值。

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@Override
void handleReturnCode() {
// If mArgs is null, then MCS couldn't be reached. When it
// reconnects, it will try again to install. At that point, this
// will succeed.
if (mArgs != null) {
processPendingInstall(mArgs, mRet);

}
}

processPendingInstall函数如下，这里的currentStatus参数就是之前调用copyApk的返回值代表是否copy文件成功，然后调用installPackageLI装载应用到PKMS中，新建一个PostInstallData对象放入mRunningInstalls中代表正在安装的应用，最后发送一个POST_INSTALL消息

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private void processPendingInstall(final InstallArgs args, final int currentStatus) {
mHandler.post(new Runnable() {
public void run() {
mHandler.removeCallbacks(this);
// Result object to be returned

PackageInstalledInfo res = new PackageInstalledInfo();
res.returnCode = currentStatus;
res.uid = -1;
res.pkg = null;
res.removedInfo = new PackageRemovedInfo();
if (res.returnCode == PackageManager.INSTALL_SUCCEEDED) {//copy文件成功
args.doPreInstall(res.returnCode);
synchronized (mInstallLock) {
installPackageLI(args, res);
}
args.doPostInstall(res.returnCode, res.uid);
}

final boolean update = res.removedInfo.removedPackage != null;
final int flags = (res.pkg == null) ? 0 : res.pkg.applicationInfo.flags;
boolean doRestore = !update
&& ((flags & ApplicationInfo.FLAG_ALLOW_BACKUP) != 0);

int token;
if (mNextInstallToken < 0) mNextInstallToken = 1;
token = mNextInstallToken++;

PostInstallData data = new PostInstallData(args, res);
mRunningInstalls.put(token, data);//正在安装的应用

if (res.returnCode == PackageManager.INSTALL_SUCCEEDED && doRestore) {
IBackupManager bm = IBackupManager.Stub.asInterface(
ServiceManager.getService(Context.BACKUP_SERVICE));
if (bm != null) {
try {
if (bm.isBackupServiceActive(UserHandle.USER_OWNER)) {
bm.restoreAtInstall(res.pkg.applicationInfo.packageName, token);
} else {
doRestore = false;
}
} catch (RemoteException e) {
// can't happen; the backup manager is local
} catch (Exception e) {
Slog.e(TAG, "Exception trying to enqueue restore", e);
doRestore = false;
}
} else {
Slog.e(TAG, "Backup Manager not found!");
doRestore = false;
}
}

if (!doRestore) {
Message msg = mHandler.obtainMessage(POST_INSTALL, token, 0);
mHandler.sendMessage(msg);
}
}
});
}

上面我们还要注意在调用installPackageLI函数前后都有调用args.doPostInstall函数，下面我么来看这个函数，没有uid参数的那个函数也是一样的。这个函数当没有安装成功就删除之前在data/app下面创建的apk临时目录。特别注意在调用完installPackageLI之后也要调用下这个函数，因为在installPackageLI函数的处理中可以会有比如应用已经安装过这样的情况等，都会导致安装失败，这个时候都要把临时文件清除。

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int doPostInstall(int status, int uid) {
if (status != PackageManager.INSTALL_SUCCEEDED) {
cleanUp();
}
return status;
}

1.5 installPackageLI函数

我们先来看下installPackageLI函数如下代码，我们先会新建一个PackageParser来解析apk文件，这个我们之前的博客中分析过，这里就不看了。后面成功之后会调用args的rename函数，把临时文件重新命名。然后如果是一个新应用会调用installNewPackageLI函数。

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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));
......

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

if (!args.doRename(res.returnCode, pkg, oldCodePath)) {//重新命名
res.setError(INSTALL_FAILED_INSUFFICIENT_STORAGE, "Failed rename");
return;
}

startIntentFilterVerifications(args.user.getIdentifier(), replace, pkg);

if (replace) {//升级
replacePackageLI(pkg, parseFlags, scanFlags | SCAN_REPLACING, args.user,
installerPackageName, volumeUuid, res);
} else {
installNewPackageLI(pkg, parseFlags, scanFlags | SCAN_DELETE_DATA_ON_FAILURES,
args.user, installerPackageName, volumeUuid, res);
}
......
}

FileInstallArgs的doRename函数调用了getNextCodePath函数来获取新的apk的目录的name，然后调用os的rename函数重新命名。然后Package的一些变量改下。

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boolean doRename(int status, PackageParser.Package pkg, String oldCodePath) {
if (status != PackageManager.INSTALL_SUCCEEDED) {
cleanUp();
return false;
}

final File targetDir = codeFile.getParentFile();
final File beforeCodeFile = codeFile;
final File afterCodeFile = getNextCodePath(targetDir, pkg.packageName);//获取新名字

if (DEBUG_INSTALL) Slog.d(TAG, "Renaming " + beforeCodeFile + " to " + afterCodeFile);
try {
Os.rename(beforeCodeFile.getAbsolutePath(), afterCodeFile.getAbsolutePath());//rename
} catch (ErrnoException e) {
Slog.w(TAG, "Failed to rename", e);
return false;
}

if (!SELinux.restoreconRecursive(afterCodeFile)) {
Slog.w(TAG, "Failed to restorecon");
return false;
}

// Reflect the rename internally
codeFile = afterCodeFile;
resourceFile = afterCodeFile;

// Reflect the rename in scanned details
pkg.codePath = afterCodeFile.getAbsolutePath();
pkg.baseCodePath = FileUtils.rewriteAfterRename(beforeCodeFile, afterCodeFile,
pkg.baseCodePath);
pkg.splitCodePaths = FileUtils.rewriteAfterRename(beforeCodeFile, afterCodeFile,
pkg.splitCodePaths);

// Reflect the rename in app info
pkg.applicationInfo.volumeUuid = pkg.volumeUuid;
pkg.applicationInfo.setCodePath(pkg.codePath);
pkg.applicationInfo.setBaseCodePath(pkg.baseCodePath);
pkg.applicationInfo.setSplitCodePaths(pkg.splitCodePaths);
pkg.applicationInfo.setResourcePath(pkg.codePath);
pkg.applicationInfo.setBaseResourcePath(pkg.baseCodePath);
pkg.applicationInfo.setSplitResourcePaths(pkg.splitCodePaths);

return true;
}

我们看下getNextCodePath获取新的apk目录名字，就是apk的那么加一个后缀。

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private File getNextCodePath(File targetDir, String packageName) {
int suffix = 1;
File result;
do {
result = new File(targetDir, packageName + "-" + suffix);
suffix++;
} while (result.exists());
return result;
}

类似如下：

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com.moji.mjweather-1

1.6 POST_INSTALL消息的处理

我们再来看看之前在processPendingInstall函数中发送的POST_INSTALL消息的处理：

这里主要的逻辑是当应用安装成功后，发送广播（比如Launcher应用接受广播后显示桌面图标）。

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case POST_INSTALL: {
if (DEBUG_INSTALL) Log.v(TAG, "Handling post-install for " + msg.arg1);
PostInstallData data = mRunningInstalls.get(msg.arg1);
mRunningInstalls.delete(msg.arg1);
boolean deleteOld = false;

if (data != null) {
InstallArgs args = data.args;
PackageInstalledInfo res = data.res;

if (res.returnCode == PackageManager.INSTALL_SUCCEEDED) {
final String packageName = res.pkg.applicationInfo.packageName;
res.removedInfo.sendBroadcast(false, true, false);
Bundle extras = new Bundle(1);
extras.putInt(Intent.EXTRA_UID, res.uid);

// Now that we successfully installed the package, grant runtime
// permissions if requested before broadcasting the install.
if ((args.installFlags
& PackageManager.INSTALL_GRANT_RUNTIME_PERMISSIONS) != 0) {
grantRequestedRuntimePermissions(res.pkg, args.user.getIdentifier(),
args.installGrantPermissions);
}

// Determine the set of users who are adding this
// package for the first time vs. those who are seeing
// an update.
int[] firstUsers;
int[] updateUsers = new int[0];
if (res.origUsers == null || res.origUsers.length == 0) {
firstUsers = res.newUsers;
} else {
firstUsers = new int[0];
for (int i=0; i<res.newUsers.length; i++) {
int user = res.newUsers[i];
boolean isNew = true;
for (int j=0; j<res.origUsers.length; j++) {
if (res.origUsers[j] == user) {
isNew = false;
break;
}
}
if (isNew) {
int[] newFirst = new int[firstUsers.length+1];
System.arraycopy(firstUsers, 0, newFirst, 0,
firstUsers.length);
newFirst[firstUsers.length] = user;
firstUsers = newFirst;
} else {
int[] newUpdate = new int[updateUsers.length+1];
System.arraycopy(updateUsers, 0, newUpdate, 0,
updateUsers.length);
newUpdate[updateUsers.length] = user;
updateUsers = newUpdate;
}
}
}
sendPackageBroadcast(Intent.ACTION_PACKAGE_ADDED,
packageName, extras, null, null, firstUsers);
final boolean update = res.removedInfo.removedPackage != null;
if (update) {
extras.putBoolean(Intent.EXTRA_REPLACING, true);
}
sendPackageBroadcast(Intent.ACTION_PACKAGE_ADDED,
packageName, extras, null, null, updateUsers);
if (update) {
sendPackageBroadcast(Intent.ACTION_PACKAGE_REPLACED,
packageName, extras, null, null, updateUsers);
sendPackageBroadcast(Intent.ACTION_MY_PACKAGE_REPLACED,
null, null, packageName, null, updateUsers);

// treat asec-hosted packages like removable media on upgrade
if (res.pkg.isForwardLocked() || isExternal(res.pkg)) {
if (DEBUG_INSTALL) {
Slog.i(TAG, "upgrading pkg " + res.pkg
+ " is ASEC-hosted -> AVAILABLE");
}
int[] uidArray = new int[] { res.pkg.applicationInfo.uid };
ArrayList<String> pkgList = new ArrayList<String>(1);
pkgList.add(packageName);
sendResourcesChangedBroadcast(true, true,
pkgList,uidArray, null);
}
}
if (res.removedInfo.args != null) {
// Remove the replaced package's older resources safely now
deleteOld = true;
}

// If this app is a browser and it's newly-installed for some
// users, clear any default-browser state in those users
if (firstUsers.length > 0) {
// the app's nature doesn't depend on the user, so we can just
// check its browser nature in any user and generalize.
if (packageIsBrowser(packageName, firstUsers[0])) {
synchronized (mPackages) {
for (int userId : firstUsers) {
mSettings.setDefaultBrowserPackageNameLPw(null, userId);
}
}
}
}
// Log current value of "unknown sources" setting
EventLog.writeEvent(EventLogTags.UNKNOWN_SOURCES_ENABLED,
getUnknownSourcesSettings());
}
// Force a gc to clear up things
Runtime.getRuntime().gc();
// We delete after a gc for applications on sdcard.
if (deleteOld) {
synchronized (mInstallLock) {
res.removedInfo.args.doPostDeleteLI(true);
}
}
if (args.observer != null) {
try {
Bundle extras = extrasForInstallResult(res);
args.observer.onPackageInstalled(res.name, res.returnCode,
res.returnMsg, extras);
} catch (RemoteException e) {
Slog.i(TAG, "Observer no longer exists.");
}
}
} else {
Slog.e(TAG, "Bogus post-install token " + msg.arg1);
}
} break;

1.7 installNewPackageLI函数

我们来看下这个函数，这个函数当mSettings和mPackages已经有这个pkg了，那就代表这个应用已经安装过了，直接调用PackageInstalledInfo的setError，这个函数会把returnCode变为INSTALL_FAILED_ALREADY_EXISTS，这样在processPendingInstall函数在调用完installPackageLI之后再调用args.doPostInstall的时候会把apk的临时文件删除。然后继续这里调用了scanPackageLI（注意这个参数是Package的那个函数，后面在扫描目录的时候再介绍），最后还是没有安装成功会在deletePackageLI删除目录，以及PKMS各个成员变量的信息。

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private void installNewPackageLI(PackageParser.Package pkg, int parseFlags, int scanFlags,
UserHandle user, String installerPackageName, String volumeUuid,
PackageInstalledInfo res) {
// Remember this for later, in case we need to rollback this install
String pkgName = pkg.packageName;

final boolean dataDirExists = Environment
.getDataUserPackageDirectory(volumeUuid, UserHandle.USER_OWNER, pkgName).exists();
synchronized(mPackages) {
if (mSettings.mRenamedPackages.containsKey(pkgName)) {
res.setError(INSTALL_FAILED_ALREADY_EXISTS, "Attempt to re-install " + pkgName
+ " without first uninstalling package running as "
+ mSettings.mRenamedPackages.get(pkgName));
return;
}
if (mPackages.containsKey(pkgName)) {
res.setError(INSTALL_FAILED_ALREADY_EXISTS, "Attempt to re-install " + pkgName
+ " without first uninstalling.");
return;
}
}

try {
PackageParser.Package newPackage = scanPackageLI(pkg, parseFlags, scanFlags,
System.currentTimeMillis(), user);

updateSettingsLI(newPackage, installerPackageName, volumeUuid, null, null, res, user);
if (res.returnCode != PackageManager.INSTALL_SUCCEEDED) {
deletePackageLI(pkgName, UserHandle.ALL, false, null, null,
dataDirExists ? PackageManager.DELETE_KEEP_DATA : 0,
res.removedInfo, true);
}

} catch (PackageManagerException e) {
res.setError("Package couldn't be installed in " + pkg.codePath, e);
}
}

二、扫描目录安装应用

我们知道在PKMS启动的时候会扫描system/app data/app等目录，如果其中有apk文件会完成apk安装

我们先来看扫描目录的函数scanDirLI，大致就是遍历各个文件调用scanPackageLI函数，但是不会扫描子目录。

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private void scanDirLI(File dir, int parseFlags, int scanFlags, long currentTime) {
final File[] files = dir.listFiles();
if (ArrayUtils.isEmpty(files)) {
Log.d(TAG, "No files in app dir " + dir);
return;
}

if (DEBUG_PACKAGE_SCANNING) {
Log.d(TAG, "Scanning app dir " + dir + " scanFlags=" + scanFlags
+ " flags=0x" + Integer.toHexString(parseFlags));
}

for (File file : files) {
final boolean isPackage = (isApkFile(file) || file.isDirectory())
&& !PackageInstallerService.isStageName(file.getName());
if (!isPackage) {
// Ignore entries which are not packages
continue;
}
try {
scanPackageLI(file, parseFlags | PackageParser.PARSE_MUST_BE_APK,
scanFlags, currentTime, null);
} catch (PackageManagerException e) {
Slog.w(TAG, "Failed to parse " + file + ": " + e.getMessage());

// Delete invalid userdata apps
if ((parseFlags & PackageParser.PARSE_IS_SYSTEM) == 0 &&
e.error == PackageManager.INSTALL_FAILED_INVALID_APK) {
logCriticalInfo(Log.WARN, "Deleting invalid package at " + file);
if (file.isDirectory()) {
mInstaller.rmPackageDir(file.getAbsolutePath());
} else {
file.delete();
}
}
}
}
}

2.1 scanPackageLI函数

scanPackageLI函数，先是解析apk文件，然后处理升级包，扫描文件签名、应用包冲突、应用代码路径资源路径，设置应用相关路劲等，最后调用了scanPackageLI（注意这个参数是Package）继续。

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private PackageParser.Package scanPackageLI(File scanFile, int parseFlags, int scanFlags,
long currentTime, UserHandle user) throws PackageManagerException {
if (DEBUG_INSTALL) Slog.d(TAG, "Parsing: " + scanFile);
parseFlags |= mDefParseFlags;
PackageParser pp = new PackageParser();
pp.setSeparateProcesses(mSeparateProcesses);
pp.setOnlyCoreApps(mOnlyCore);
pp.setDisplayMetrics(mMetrics);

if ((scanFlags & SCAN_TRUSTED_OVERLAY) != 0) {
parseFlags |= PackageParser.PARSE_TRUSTED_OVERLAY;
}

final PackageParser.Package pkg;
try {
pkg = pp.parsePackage(scanFile, parseFlags);//解析
} catch (PackageParserException e) {
throw PackageManagerException.from(e);
}

......

// Set application objects path explicitly.
pkg.applicationInfo.volumeUuid = pkg.volumeUuid;
pkg.applicationInfo.setCodePath(pkg.codePath);//设置各种路径
pkg.applicationInfo.setBaseCodePath(pkg.baseCodePath);
pkg.applicationInfo.setSplitCodePaths(pkg.splitCodePaths);
pkg.applicationInfo.setResourcePath(resourcePath);
pkg.applicationInfo.setBaseResourcePath(baseResourcePath);
pkg.applicationInfo.setSplitResourcePaths(pkg.splitCodePaths);

PackageParser.Package scannedPkg = scanPackageLI(pkg, parseFlags, scanFlags
| SCAN_UPDATE_SIGNATURE, currentTime, user);

......

return scannedPkg;
}

scanPackageLI就是调用scanPackageDirtyLI函数，出错了再删除相关目录。

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private PackageParser.Package scanPackageLI(PackageParser.Package pkg, int parseFlags,
int scanFlags, long currentTime, UserHandle user) throws PackageManagerException {
boolean success = false;
try {
final PackageParser.Package res = scanPackageDirtyLI(pkg, parseFlags, scanFlags,
currentTime, user);
success = true;
return res;
} finally {
if (!success && (scanFlags & SCAN_DELETE_DATA_ON_FAILURES) != 0) {
removeDataDirsLI(pkg.volumeUuid, pkg.packageName);
}
}
}

2.2 scanPackageDirtyLI函数

这个函数之前博客分析过了，这里我们说下几点：

1. 安装应用中的动态库，如果应用自带了本地动态库，安装在data/data/<pacage-name>/lib下。如果是系统应用，展开的动态库放在/system/lib下。

我们来看下墨迹天气的lib目录：

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********:/data/data/com.moji.mjweather/lib # ls
libedittextutil.so
libgetuiext.so
libskinEncrypt.so
libuninstall.so
libusedes.so

2. 重新优化dex，会调用performDexOptLI函数

3. 最后会把应用的Activity、Service、Provider、Receiver、Permission、PermissionGroup信息都提取出来放在如下变量中。

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final ActivityIntentResolver mActivities =
new ActivityIntentResolver();

final ActivityIntentResolver mReceivers =
new ActivityIntentResolver();

final ServiceIntentResolver mServices = new ServiceIntentResolver();

final ProviderIntentResolver mProviders = new ProviderIntentResolver();

PKMS的performDexOpt函数，最终会调用PackageDexOptimizer的performDexOpt函数，代码如下，看是否需要持锁。然后调用performDexOptLI函数。

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int performDexOpt(PackageParser.Package pkg, String[] instructionSets,
boolean forceDex, boolean defer, boolean inclDependencies, boolean bootComplete) {
ArraySet<String> done;
if (inclDependencies && (pkg.usesLibraries != null || pkg.usesOptionalLibraries != null)) {
done = new ArraySet<String>();
done.add(pkg.packageName);
} else {
done = null;
}
synchronized (mPackageManagerService.mInstallLock) {
final boolean useLock = mSystemReady;
if (useLock) {
mDexoptWakeLock.setWorkSource(new WorkSource(pkg.applicationInfo.uid));
mDexoptWakeLock.acquire();
}
try {
return performDexOptLI(pkg, instructionSets, forceDex, defer, bootComplete, done);
} finally {
if (useLock) {
mDexoptWakeLock.release();
}
}
}
}

performDexOptLI函数，先看有没有lib需要dex。最后调用了PKMS的mInstaller.dexopt函数来优化。最后就到Installd中执行。

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private int performDexOptLI(PackageParser.Package pkg, String[] targetInstructionSets,
boolean forceDex, boolean defer, boolean bootComplete, ArraySet<String> done) {
final String[] instructionSets = targetInstructionSets != null ?
targetInstructionSets : getAppDexInstructionSets(pkg.applicationInfo);

if (done != null) {
done.add(pkg.packageName);
if (pkg.usesLibraries != null) {
performDexOptLibsLI(pkg.usesLibraries, instructionSets, forceDex, defer,
bootComplete, done);
}
if (pkg.usesOptionalLibraries != null) {
performDexOptLibsLI(pkg.usesOptionalLibraries, instructionSets, forceDex, defer,
bootComplete, done);
}
}

if ((pkg.applicationInfo.flags & ApplicationInfo.FLAG_HAS_CODE) == 0) {
return DEX_OPT_SKIPPED;
}

final boolean vmSafeMode = (pkg.applicationInfo.flags & ApplicationInfo.FLAG_VM_SAFE_MODE) != 0;
final boolean debuggable = (pkg.applicationInfo.flags & ApplicationInfo.FLAG_DEBUGGABLE) != 0;

final List<String> paths = pkg.getAllCodePathsExcludingResourceOnly();
boolean performedDexOpt = false;
final String[] dexCodeInstructionSets = getDexCodeInstructionSets(instructionSets);
for (String dexCodeInstructionSet : dexCodeInstructionSets) {
if (!forceDex && pkg.mDexOptPerformed.contains(dexCodeInstructionSet)) {
continue;
}

for (String path : paths) {
final int dexoptNeeded;
if (forceDex) {
dexoptNeeded = DexFile.DEX2OAT_NEEDED;
} else {
try {
dexoptNeeded = DexFile.getDexOptNeeded(path, pkg.packageName,
dexCodeInstructionSet, defer);
} catch (IOException ioe) {
Slog.w(TAG, "IOException reading apk: " + path, ioe);
return DEX_OPT_FAILED;
}
}

if (!forceDex && defer && dexoptNeeded != DexFile.NO_DEXOPT_NEEDED) {
// We're deciding to defer a needed dexopt. Don't bother dexopting for other
// paths and instruction sets. We'll deal with them all together when we process
// our list of deferred dexopts.
addPackageForDeferredDexopt(pkg);
return DEX_OPT_DEFERRED;
}

if (dexoptNeeded != DexFile.NO_DEXOPT_NEEDED) {
final String dexoptType;
String oatDir = null;
if (dexoptNeeded == DexFile.DEX2OAT_NEEDED) {
dexoptType = "dex2oat";
try {
oatDir = createOatDirIfSupported(pkg, dexCodeInstructionSet);
} catch (IOException ioe) {
Slog.w(TAG, "Unable to create oatDir for package: " + pkg.packageName);
return DEX_OPT_FAILED;
}
} else if (dexoptNeeded == DexFile.PATCHOAT_NEEDED) {
dexoptType = "patchoat";
} else if (dexoptNeeded == DexFile.SELF_PATCHOAT_NEEDED) {
dexoptType = "self patchoat";
} else {
throw new IllegalStateException("Invalid dexopt needed: " + dexoptNeeded);
}

final int sharedGid = UserHandle.getSharedAppGid(pkg.applicationInfo.uid);
final int ret = mPackageManagerService.mInstaller.dexopt(path, sharedGid,
!pkg.isForwardLocked(), pkg.packageName, dexCodeInstructionSet,
dexoptNeeded, vmSafeMode, debuggable, oatDir, bootComplete);

if (ret == 0) {
performedDexOpt = true;
}
}
}
......

这里我们需要注意下oatDir这个参数，是通过下面函数获取的。

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oatDir = createOatDirIfSupported(pkg, dexCodeInstructionSet);

我们来看createOatDirIfSupported，如果codePath是一个目录就返回一个oatDir，否则就是空。

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private String createOatDirIfSupported(PackageParser.Package pkg, String dexInstructionSet)
throws IOException {
if (!pkg.canHaveOatDir()) {
return null;
}
File codePath = new File(pkg.codePath);
if (codePath.isDirectory()) {
File oatDir = getOatDir(codePath);
mPackageManagerService.mInstaller.createOatDir(oatDir.getAbsolutePath(),
dexInstructionSet);
return oatDir.getAbsolutePath();
}
return null;
}

传到Installd中，是空的话，默认会在data/dalvik-cache下面，我们来看下，这个是arm目录，如果是64为是在arm64目录下：

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*******:/data/dalvik-cache/arm # ls
data@app@IflytekInput.apk@classes.dex
data@app@NotePadPlus.apk@classes.dex
system@app@Bluetooth@Bluetooth.apk@classes.dex
system@app@Galaxy4@Galaxy4.apk@classes.dex
system@app@Gallery2@Gallery2.apk@classes.dex
system@app@HoloSpiralWallpaper@HoloSpiralWallpaper.apk@classes.dex
system@app@NoiseField@NoiseField.apk@classes.dex
system@app@PhaseBeam@PhaseBeam.apk@classes.dex
system@app@webview@webview.apk@classes.dex
system@framework@am.jar@classes.dex
system@framework@android.test.runner.jar@classes.dex
system@framework@appops.jar@classes.dex
system@framework@appwidget.jar@classes.dex
system@framework@bmgr.jar@classes.dex
system@framework@boot.art
system@framework@boot.oat
system@framework@bu.jar@classes.dex
system@framework@com.android.future.usb.accessory.jar@classes.dex
system@framework@com.android.location.provider.jar@classes.dex
system@framework@com.android.media.remotedisplay.jar@classes.dex
system@framework@com.android.mediadrm.signer.jar@classes.dex
system@framework@com.android.nfc_extras.jar@classes.dex
system@framework@com.broadcom.bt.jar@classes.dex
system@framework@com.broadcom.nfc.jar@classes.dex
system@framework@com.vzw.nfc.jar@classes.dex
system@framework@content.jar@classes.dex

普通的应用就在其oat/arm目录下

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******:/data/app/com.moji.mjweather-1/oat/arm # ls
base.odex

原文地址
http://blog.csdn.net/kc58236582/article/details/53022791
小结：

序列图

无论是开机扫描各个目录的apk文件，还是安装新的apk最后都会调用scanPackageDirtyLI方法。

我们来简单回顾下，开机扫描各个目录的时候是调用scanDirLI函数，然后调用scanPackageLI函数这个函数第一个参数是File，这个函数会新建一个PackageParser对象，来解析文件。最后也会调用另一个scanPackageLI方法这个参数是Packageparser.Package类。而在这个scanPackageLI方法中最后调用了scanPackageDirtyLI方法。

在安装一个新应用的时候先copy apk文件到指定目录，后面会调用installPackageLI，这个函数也会创建一个PackageParser对象来解析apk文件，后面会调用installNewPackageLI继续处理，最后会发送广播通知其他应用，比如Launcher增加图标等。在installNewPackageLI函数中也会调用scanPackageLI函数，是参数是Packageparser.Package类。而最后就会调用scanPackageDirtyLI方法。

所以其实无论开机扫描还是安装应用其实流程差不多。