禁止Android安装某些apk应用

应用程序包的安装是android的特点

APK为AndroidPackage的缩写

Android应用安装有如下四种方式：

1.系统应用安装――开机时完成，没有安装界面

2.网络下载应用安装――通过market应用完成，没有安装界面

3.ADB工具安装――没有安装界面。

4.第三方应用安装――通过SD卡里的APK文件安装，有安装界面，由 packageinstaller.apk应用处理安装及卸载过程的界面。

应用安装的流程及路径
应用安装涉及到如下几个目录：

system/app ---------------系统自带的应用程序，获得adb root权限才能删除

data/app ---------------用户程序安装的目录。安装时把 apk文件复制到此目录
data/data ---------------存放应用程序的数据
data/dalvik-cache--------将apk中的dex文件安装到dalvik-cache目录下(dex文件是dalvik虚拟机的可执行文件,其大小约为原始apk文件大小的四分之一)

安装过程：

复制APK安装包到data/app目录下，解压并扫描安装包，把dex文件(Dalvik字节码)保存到dalvik-cache目录，并data/data目录下创建对应的应用数据目录。

卸载过程：

删除安装过程中在上述三个目录下创建的文件及目录。

安装应用的过程解析

一.开机安装
PackageManagerService处理各种应用的安装，卸载，管理等工作，开机时由systemServer启动此服务

(源文件路径：android\frameworks\base\services\java\com\android\server\PackageManagerService.java)

PackageManagerService服务启动的流程：

1.首先扫描安装“system\framework”目录下的jar包

 // Find base frameworks (resource packages without code).mFrameworkInstallObserver = new AppDirObserver(mFrameworkDir.getPath(), OBSERVER_EVENTS, true);mFrameworkInstallObserver.startWatching();scanDirLI(mFrameworkDir, PackageParser.PARSE_IS_SYSTEM| PackageParser.PARSE_IS_SYSTEM_DIR,scanMode | SCAN_NO_DEX, 0);

2.扫描安装系统system/app的应用程序

  // Collect all system packages.mSystemAppDir = new File(Environment.getRootDirectory(), "app");mSystemInstallObserver = new AppDirObserver(mSystemAppDir.getPath(), OBSERVER_EVENTS, true);mSystemInstallObserver.startWatching();scanDirLI(mSystemAppDir, PackageParser.PARSE_IS_SYSTEM| PackageParser.PARSE_IS_SYSTEM_DIR, scanMode, 0);

3.制造商的目录下/vendor/app应用包

 // Collect all vendor packages.mVendorAppDir = new File("/vendor/app");mVendorInstallObserver = new AppDirObserver(mVendorAppDir.getPath(), OBSERVER_EVENTS, true);mVendorInstallObserver.startWatching();scanDirLI(mVendorAppDir, PackageParser.PARSE_IS_SYSTEM| PackageParser.PARSE_IS_SYSTEM_DIR, scanMode, 0);

4.扫描“data\app”目录，即用户安装的第三方应用

scanDirLI(mAppInstallDir, 0, scanMode, 0);

5.扫描" data\app-private"目录，即安装DRM保护的APK文件（一个受保护的歌曲或受保护的视频是使用 DRM 保护的文件）

scanDirLI(mDrmAppPrivateInstallDir, PackageParser.PARSE_FORWARD_LOCK,scanMode, 0);

扫描方法的代码清单

private void scanDirLI(File dir, int flags, int scanMode, long currentTime) {String[] files = dir.list();if (files == null) {Log.d(TAG, "No files in app dir " + dir);return;}if (false) {Log.d(TAG, "Scanning app dir " + dir);}int i;for (i=0; i<files.length; i++) {File file = new File(dir, files[i]);if (!isPackageFilename(files[i])) {// Ignore entries which are not apk'scontinue;}PackageParser.Package pkg = scanPackageLI(file,flags|PackageParser.PARSE_MUST_BE_APK, scanMode, currentTime);// Don't mess around with apps in system partition.if (pkg == null && (flags & PackageParser.PARSE_IS_SYSTEM) == 0 &&mLastScanError == PackageManager.INSTALL_FAILED_INVALID_APK) {// Delete the apkSlog.w(TAG, "Cleaning up failed install of " + file);file.delete();}}}

并且从该扫描方法中可以看出调用了scanPackageLI（）

private PackageParser.Package scanPackageLI(File scanFile,

int parseFlags, int scanMode, long currentTime)

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 installermLastScanError =    PackageManager.INSTALL_FAILED_INSUFFICIENT_STORAGE;return null;}}

mInstaller.install（）通过

LocalSocketAddress address = new LocalSocketAddress(

"installd", LocalSocketAddress.Namespace.RESERVED);

指挥installd在C语言的文件中完成工作

PackageManagerService小节：1)从apk, xml中载入pacakge信息, 存储到内部成员变量中, 用于后面的查找. 关键的方法是scanPackageLI().
2)各种查询操作, 包括query Intent操作.
3)install package和delete package的操作. 还有后面的关键方法是installPackageLI().

二、从网络上下载应用：

下载完成后，会自动调用Packagemanager的安装方法installPackage（）

/* Called when a downloaded package installation has been confirmed by the user */

由英文注释可见PackageManagerService类的installPackage（）函数为安装程序入口。

 public void installPackage(final Uri packageURI, final IPackageInstallObserver observer, final int flags,final String installerPackageName) {mContext.enforceCallingOrSelfPermission(android.Manifest.permission.INSTALL_PACKAGES, null);Message msg = mHandler.obtainMessage(INIT_COPY);msg.obj = new InstallParams(packageURI, observer, flags,installerPackageName);mHandler.sendMessage(msg);}

其中是通过PackageHandler的实例mhandler.sendMessage（msg）把信息发给继承Handler的类HandleMessage()方法

class PackageHandler extends Handler{*****************省略若干********************public void handleMessage(Message msg) {try {doHandleMessage(msg);} finally {Process.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND);}}******************省略若干**********************}

把信息发给doHandleMessage()方法,方法中用switch（）语句进行判定传来Message

 void doHandleMessage(Message msg) {switch (msg.what) {case INIT_COPY: {if (DEBUG_SD_INSTALL) Log.i(TAG, "init_copy");HandlerParams params = (HandlerParams) msg.obj;int idx = mPendingInstalls.size();if (DEBUG_SD_INSTALL) Log.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.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;}case MCS_BOUND: {if (DEBUG_SD_INSTALL) Log.i(TAG, "mcs_bound");if (msg.obj != null) {mContainerService = (IMediaContainerService) msg.obj;}if (mContainerService == null) {// Something seriously wrong. Bail outSlog.e(TAG, "Cannot bind to media container service");for (HandlerParams params : mPendingInstalls) {mPendingInstalls.remove(0);// Indicate service bind errorparams.serviceError();}mPendingInstalls.clear();} else if (mPendingInstalls.size() > 0) {HandlerParams params = mPendingInstalls.get(0);if (params != null) {params.startCopy();}} else {// Should never happen ideally.Slog.w(TAG, "Empty queue");}break;}****************省略若干**********************
}
}

public final boolean sendMessage (Message msg)

public final boolean sendEmptyMessage (int what)

两者参数有别。

然后调用抽象类HandlerParams中的一个startCopy（）方法

abstract class HandlerParams {

final void startCopy() {

***************若干if语句判定否这打回handler消息*******

handleReturnCode();

}
}

handleReturnCode（）复写了两次其中有一次是删除时要调用的，只列出安装调用的一个方法

 @Overridevoid 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);}}

这时可以清楚的看见 processPendingInstall（）被调用。

其中run（）方法如下

run(){
synchronized (mInstallLock) {************省略*****************installPackageLI(args, true, res);}
}
instaPacakgeLI（）args,res参数分析

-----------------------------------------------------------------------------------------

//InstallArgs 是在PackageService定义的static abstract class InstallArgs 静态抽象类。

static abstract class InstallArgs {
*********************************************************************
其中定义了flag标志，packageURL，创建文件，拷贝apk，修改包名称，还有一些删除文件的清理，释放存储函数。*********************************************************************
}class PackageInstalledInfo {String name;int uid;PackageParser.Package pkg;int returnCode;PackageRemovedInfo removedInfo;}

-----------------------------------------------------------------------------------------

  private void installPackageLI(InstallArgs args,boolean newInstall, PackageInstalledInfo res) {int pFlags = args.flags;String installerPackageName = args.installerPackageName;File tmpPackageFile = new File(args.getCodePath());boolean forwardLocked = ((pFlags & PackageManager.INSTALL_FORWARD_LOCK) != 0);boolean onSd = ((pFlags & PackageManager.INSTALL_EXTERNAL) != 0);boolean replace = false;int scanMode = (onSd ? 0 : SCAN_MONITOR) | SCAN_FORCE_DEX | SCAN_UPDATE_SIGNATURE| (newInstall ? SCAN_NEW_INSTALL : 0);// Result object to be returnedres.returnCode = PackageManager.INSTALL_SUCCEEDED;// Retrieve PackageSettings and parse packageint parseFlags = PackageParser.PARSE_CHATTY |(forwardLocked ? PackageParser.PARSE_FORWARD_LOCK : 0) |(onSd ? PackageParser.PARSE_ON_SDCARD : 0);parseFlags |= mDefParseFlags;PackageParser pp = new PackageParser(tmpPackageFile.getPath());pp.setSeparateProcesses(mSeparateProcesses);final PackageParser.Package pkg = pp.parsePackage(tmpPackageFile,null, mMetrics, parseFlags);if (pkg == null) {res.returnCode = pp.getParseError();return;}String pkgName = res.name = pkg.packageName;if ((pkg.applicationInfo.flags&ApplicationInfo.FLAG_TEST_ONLY) != 0) {if ((pFlags&PackageManager.INSTALL_ALLOW_TEST) == 0) {res.returnCode = PackageManager.INSTALL_FAILED_TEST_ONLY;return;}}if (GET_CERTIFICATES && !pp.collectCertificates(pkg, parseFlags)) {res.returnCode = pp.getParseError();return;}// Get rid of all references to package scan path via parser.pp = null;String oldCodePath = null;boolean systemApp = false;synchronized (mPackages) {// Check if installing already existing packageif ((pFlags&PackageManager.INSTALL_REPLACE_EXISTING) != 0) {String oldName = mSettings.mRenamedPackages.get(pkgName);if (pkg.mOriginalPackages != null&& pkg.mOriginalPackages.contains(oldName)&& mPackages.containsKey(oldName)) {// This package is derived from an original package,// and this device has been updating from that original// name.  We must continue using the original name, so// rename the new package here.pkg.setPackageName(oldName);pkgName = pkg.packageName;replace = true;} else if (mPackages.containsKey(pkgName)) {// This package, under its official name, already exists// on the device; we should replace it.replace = true;}}PackageSetting ps = mSettings.mPackages.get(pkgName);if (ps != null) {oldCodePath = mSettings.mPackages.get(pkgName).codePathString;if (ps.pkg != null && ps.pkg.applicationInfo != null) {systemApp = (ps.pkg.applicationInfo.flags &ApplicationInfo.FLAG_SYSTEM) != 0;}}}if (systemApp && onSd) {// Disable updates to system apps on sdcardSlog.w(TAG, "Cannot install updates to system apps on sdcard");res.returnCode = PackageManager.INSTALL_FAILED_INVALID_INSTALL_LOCATION;return;}if (!args.doRename(res.returnCode, pkgName, oldCodePath)) {res.returnCode = PackageManager.INSTALL_FAILED_INSUFFICIENT_STORAGE;return;}// Set application objects path explicitly after the renamesetApplicationInfoPaths(pkg, args.getCodePath(), args.getResourcePath());pkg.applicationInfo.nativeLibraryDir = args.getNativeLibraryPath();if (replace) {replacePackageLI(pkg, parseFlags, scanMode,installerPackageName, res);} else {installNewPackageLI(pkg, parseFlags, scanMode,installerPackageName,res);}}

最后判断如果以前不存在那么调用installNewPackageLI(）

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**************************************************
}

最后终于回到了和开机安装一样的地方.与开机方式安装调用统一方法。

三、从ADB工具安装

其入口函数源文件为pm.java

(源文件路径：android\frameworks\base\cmds\pm\src\com\android\commands\pm\pm.java)

其中\system\framework\pm.jar 包管理库

包管理脚本 \system\bin\pm 解析

showUsage就是使用方法

private static void showUsage() { System.err.println("usage: pm [list|path|install|uninstall]"); System.err.println("       pm list packages [-f]"); System.err.println("       pm list permission-groups"); System.err.println("       pm list permissions [-g] [-f] [-d] [-u] [GROUP]"); System.err.println("       pm list instrumentation [-f] [TARGET-PACKAGE]"); System.err.println("       pm list features"); System.err.println("       pm path PACKAGE"); System.err.println("       pm install [-l] [-r] [-t] [-i INSTALLER_PACKAGE_NAME] [-s] [-f] PATH"); System.err.println("       pm uninstall [-k] PACKAGE"); System.err.println("       pm enable PACKAGE_OR_COMPONENT"); System.err.println("       pm disable PACKAGE_OR_COMPONENT"); System.err.println("       pm setInstallLocation [0/auto] [1/internal] [2/external]");**********************省略**************************}

安装时候会调用 runInstall（）方法

  private void runInstall() {int installFlags = 0;String installerPackageName = null;String opt;while ((opt=nextOption()) != null) {if (opt.equals("-l")) {installFlags |= PackageManager.INSTALL_FORWARD_LOCK;} else if (opt.equals("-r")) {installFlags |= PackageManager.INSTALL_REPLACE_EXISTING;} else if (opt.equals("-i")) {installerPackageName = nextOptionData();if (installerPackageName == null) {System.err.println("Error: no value specified for -i");showUsage();return;}} else if (opt.equals("-t")) {installFlags |= PackageManager.INSTALL_ALLOW_TEST;} else if (opt.equals("-s")) {// Override if -s option is specified.installFlags |= PackageManager.INSTALL_EXTERNAL;} else if (opt.equals("-f")) {// Override if -s option is specified.installFlags |= PackageManager.INSTALL_INTERNAL;} else {System.err.println("Error: Unknown option: " + opt);showUsage();return;}}String apkFilePath = nextArg();System.err.println("\tpkg: " + apkFilePath);if (apkFilePath == null) {System.err.println("Error: no package specified");showUsage();return;}PackageInstallObserver obs = new PackageInstallObserver();try {mPm.installPackage(Uri.fromFile(new File(apkFilePath)), obs, installFlags,installerPackageName);synchronized (obs) {while (!obs.finished) {try {obs.wait();} catch (InterruptedException e) {}}if (obs.result == PackageManager.INSTALL_SUCCEEDED) {System.out.println("Success");} else {System.err.println("Failure ["+ installFailureToString(obs.result)+ "]");}}} catch (RemoteException e) {System.err.println(e.toString());System.err.println(PM_NOT_RUNNING_ERR);}}

其中的

PackageInstallObserver obs = new PackageInstallObserver();

mPm.installPackage(Uri.fromFile(new File(apkFilePath)), obs, installFlags,

installerPackageName);

如果安装成功

obs.result == PackageManager.INSTALL_SUCCEEDED)

又因为有

IPackageManage mPm；

mPm = IpackageManager.Stub.asInterface(ServiceManager.getService("package"));

Stub是接口IPackageManage的静态抽象类，asInterface是返回IPackageManager代理的静态方法。

因为class PackageManagerService extends IPackageManager.Stub

所以mPm.installPackage 调用

/* Called when a downloaded package installation has been confirmed by the user */

public void installPackage(

final Uri packageURI, final IPackageInstallObserver observer, final int flags,final String installerPackageName)

这样就是从网络下载安装的入口了。

四,从SD卡安装

系统调用PackageInstallerActivity.java（/home/zhongda/androidSRC/vortex-8inch-for-hoperun/packages/apps/PackageInstaller/src/com/android/packageinstaller）

进入这个Activity会判断信息是否有错，然后调用

private void initiateInstall()判断是否曾经有过同名包的安装，或者包已经安装

通过后执行private void startInstallConfirm() 点击OK按钮后经过一系列的安装信息的判断Intent跳转到

public class InstallAppProgress extends Activity implements View.OnClickListener, OnCancelListenerpublic void onCreate(Bundle icicle) {super.onCreate(icicle);Intent intent = getIntent();mAppInfo = intent.getParcelableExtra(PackageUtil.INTENT_ATTR_APPLICATION_INFO);mPackageURI = intent.getData();initView();}

方法中调用了initView（）方法

 public void initView() {requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.op_progress);int installFlags = 0;PackageManager pm = getPackageManager();try {PackageInfo pi = pm.getPackageInfo(mAppInfo.packageName, PackageManager.GET_UNINSTALLED_PACKAGES);if(pi != null) {installFlags |= PackageManager.INSTALL_REPLACE_EXISTING;}} catch (NameNotFoundException e) {}if((installFlags & PackageManager.INSTALL_REPLACE_EXISTING )!= 0) {Log.w(TAG, "Replacing package:" + mAppInfo.packageName);}PackageUtil.AppSnippet as = PackageUtil.getAppSnippet(this, mAppInfo,mPackageURI);mLabel = as.label;PackageUtil.initSnippetForNewApp(this, as, R.id.app_snippet);mStatusTextView = (TextView)findViewById(R.id.center_text);mStatusTextView.setText(R.string.installing);mProgressBar = (ProgressBar) findViewById(R.id.progress_bar);mProgressBar.setIndeterminate(true);// Hide button till progress is being displayedmOkPanel = (View)findViewById(R.id.buttons_panel);mDoneButton = (Button)findViewById(R.id.done_button);mLaunchButton = (Button)findViewById(R.id.launch_button);mOkPanel.setVisibility(View.INVISIBLE);String installerPackageName = getIntent().getStringExtra(Intent.EXTRA_INSTALLER_PACKAGE_NAME);PackageInstallObserver observer = new PackageInstallObserver();pm.installPackage(mPackageURI, observer, installFlags, installerPackageName);}

方法最后我们可以看到再次调用安装接口完成安装。

转自：https://blog.csdn.net/hdhd588/article/details/6739281

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