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Each Permission has three attributes namely name, package and protection.

package (application), permission are store under tag. packages.xml :This file contain list of permissions and Packages/Applications. The following sample is extracted from Android 4 ICS emulator image.ġ. Package Manager stores application information in three files, located in /data/system. Package Manager Service runs in system_service process and install daemon (installd) runs as a native process. You can check "PackageInstallerActivity.java" and "InstallAppProgress.java" in the PackageInstaller source code. Package Manager starts one service named "package", and now all fuzzy things happen in this service. When the user presses the OK button, Package Manager calls the method named "installPackage" with these four parameters namely uri, installFlags, observer, installPackageName. When we install the APK file, Package Manager parse the package (APK) file and displays confirmation. Package Manage is an API that actually manages application install, uninstall, and upgrade. installd executes a series of steps to install APK with root permission. Installd daemon's primary role is to receive request from Package Manager Service via Linux domain socket / dev/ socket/ installed. Source code is available at /packages/apps/PackageInstaller. InstallAppProgress will ask Package Manager Service to install package via installd. PackageInstaller calls InstallAppProgress activity to receive instructions from the user. PackageInstaller provide user interface to manage applications/packages. PackageInstaller is the default application for Android to interactively install a normal package. What are Package Manager and Package Installer? Where I can find the source code of Package Manager and Package Installer ?.What is the APK installation process in detail ?.Where are APK files stored in Android ?.What are Package Manager and Package Installer ?.We are installing and uninstalling APK(s) every day, sometimes many in a day, but have you tried to get answers to the following questions ?