PackageInstallerSession
源码位置：PackageInstallerSession.java 。
commit
{% include_code lang:java from:689 to:750 aosp/8.1/frameworks/base/services/core/java/com/android/server/pm/PackageInstallerSession.java %} 该方法主要发送了一个MSG_COMMIT消息。下面看Handler如何处理这个消息。
Handler.Callback
{% include_code lang:java from:275 to:303 aosp/8.1/frameworks/base/services/core/java/com/android/server/pm/PackageInstallerSession.java %} 处理MSG_COMMIT消息非常简单，关键方法是commitLocked。
commitLocked
{% include_code lang:java from:841 to:946 aosp/8.1/frameworks/base/services/core/java/com/android/server/pm/PackageInstallerSession.java %} 至此PackageInstallerSession的工作就完成了，余下的工作交由PMS来完成。
needToAskForPermissionsLocked
{% include_code lang:java from:324 to:340 aosp/8.1/frameworks/base/services/core/java/com/android/server/pm/PackageInstallerSession.java %}
PackageManagerServices
installStage
{% include_code lang:java from:14931 to:14967 aosp/8.1/frameworks/base/services/core/java/com/android/server/pm/PackageManagerService.java %}