adb install 深入分析
adb install 也是用的pm命令去安装的，所以开始是在pm.java中。
frameworks\base\services\java\com\android\server\pm
1、调用pm程序开始安装
得用Pm安装时，一般是shell运行一个pm命令，并传送相应的参数，我们通过adb连接到机器，输入pm,会打出pm的一些参数
# pm
pm
public static void main(String[] args) {
new Pm().run(args);
}
public void run(String[] args) {
......进行一系列的判断......
if ("install".equals(op)) {
runInstall();
return;
}
}
private void runInstall() {
................此处省略一万字......................
mPm.installPackageWithVerification(apkURI, obs, installFlags, installerPackageName,
verificationURI, null);
}
frameworks\base\services\java\com\android\server\pm
public void installPackageWithVerification(Uri packageURI, IPackageInstallObserver observer,
int flags, String installerPackageName, Uri verificationURI,
ManifestDigest manifestDigest) {
.................此处省略一万字.............................
final Message msg = mHandler.obtainMessage(INIT_COPY);
msg.obj = new InstallParams(packageURI, observer,filteredFlags,installerPackageName,
verificationURI, manifestDigest);
mHandler.sendMessage(msg);
}
void doHandleMessage(Message msg) {
switch (msg.what) {
case INIT_COPY: {
if (DEBUG_INSTALL) Slog.i(TAG, "init_copy");
HandlerParams params = (HandlerParams) msg.obj;
int idx = mPendingInstalls.size();
if (DEBUG_INSTALL) Slog.i(TAG, "idx=" + idx);
// 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.
//连接服务 链接上返回真走else
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;
}
调用connectToService方法
private boolean connectToService() {
if (DEBUG_SD_INSTALL) Log.i(TAG, "Trying to bind to" +
" DefaultContainerService");
//连接服务DefaultContainerService
Intent service = new Intent().setComponent(DEFAULT_CONTAINER_COMPONENT);
//设置线程默认应用的优先级
Process.setThreadPriority(Process.THREAD_PRIORITY_DEFAULT);
//在连接成功的时候触发DefaultContainerConnection的onServiceConnected
if (mContext.bindService(service, mDefContainerConn,
Context.BIND_AUTO_CREATE)) {
Process.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND);
mBound = true;
return true;
}
//设置线程优先级为后台，这样当多个线程并发后很多无关紧要的线程分配的CPU时间将会减少，有利于主线程的处理
Process.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND);
return false;
}
连接服务DefaultContainerConnection 绑定成功发送一条消息MCS_BOUND
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);
//PackageHandler发了一条MCS_BOUND
mHandler.sendMessage(mHandler.obtainMessage(MCS_BOUND, imcs));
}
public void onServiceDisconnected(ComponentName name) {
if (DEBUG_SD_INSTALL) Log.i(TAG, "onServiceDisconnected");
}
};
发送了一条消息MCS_BOUND和 IMediaContainerService imcs 对象
IMediaContainerService imcs = IMediaContainerService.Stub.asInterface(service);
调用方法params.startCopy()
final boolean startCopy() {
boolean res;
try {
if (DEBUG_INSTALL) Slog.i(TAG, "startCopy");
if (++mRetries > MAX_RETRIES) {
Slog.w(TAG, "Failed to invoke remote methods on default container service. Giving up");
mHandler.sendEmptyMessage(MCS_GIVE_UP);
handleServiceError();
return false;
} else {
//安装前的准备工作
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;
}
handleStartCopy进行一些安装前准备工作，最后调用handleReturnCode
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);
}
}
mArgs 在handleStartCopy进行了初始化
/*
* 调用远程方法来获取和安装包信息
* Invoke remote method to get package information and install
* location values. Override install location based on default
* policy if needed and then create install arguments based
* on the install location.
*/
public void handleStartCopy() throws RemoteException {
..............................
int ret = PackageManager.INSTALL_SUCCEEDED;
final InstallArgs args = createInstallArgs(this);
mArgs = args;
}
private void processPendingInstall(final InstallArgs args, final int currentStatus) {
// Queue up an async operation since the package installation may take a little while.
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) {
args.doPreInstall(res.returnCode);
synchronized (mInstallLock) {
installPackageLI(args, true, res);
}
args.doPostInstall(res.returnCode);
} installPackageLI调用这个方法
在installPackageLI中，会new 一个PackageParser对package进行解析，调用parsePackage函数 parsePackage(File sourceFile, String destCodePath,
DisplayMetrics metrics, int flags)函数根据参数进行一些处理后最终调用parsePackage(
Resources res, XmlResourceParser parser, int flags, String[] outError)对包进行解析，我们看到这个函数里面主要对配置文件AndroidManifest.xml文件进行了解析。
//这个函数里面主要对配置文件AndroidManifest.xml文件进行了解析
//返回解析到的所有数据pkg
final PackageParser.Package pkg = pp.parsePackage(tmpPackageFile,
null, mMetrics, parseFlags);
private void installPackageLI(InstallArgs args,
boolean newInstall, PackageInstalledInfo res) {
..............................
//replace判断设备上面是否有安装的app
if (replace) {
replacePackageLI(pkg, parseFlags, scanMode,
installerPackageName, res);
} else {
installNewPackageLI(pkg, parseFlags, scanMode,
installerPackageName,res);
}
}
private void installNewPackageLI(PackageParser.Package pkg,
int parseFlags,int scanMode,
String installerPackageName, PackageInstalledInfo res) {
***********************省略若干*************************************************
PackageParser.Package newPackage = scanPackageLI(pkg, parseFlags, scanMode,
System.currentTimeMillis());
***********************省略若干**************************************************
}
跟踪scanPackageLI（）方法后发现，程序经过很多次的if else 的筛选，最后判定可以安装后调用了 mInstaller.install
if (mInstaller != null) {
int ret = mInstaller.install(pkgName, useEncryptedFSDir, pkg.applicationInfo.uid,pkg.applicationInfo.uid);
if(ret < 0) {
// Error from installer
mLastScanError = PackageManager.INSTALL_FAILED_INSUFFICIENT_STORAGE;
return null;
}
}
技术交流群 182189263