title: Android Listen to Installation Notification
body: <p>Google show in the notification menu percents of installation process. Does it possible to listen to it. I want f.e. receive the begining of installation process and the ending. I know that ending can be received with <code>android.intent.action.PACKAGE_ADDED</code> . But how can I get information about starting of installation or is some apps downloaded in this time from play store?</p>