@Override protected void onDestroy() {
		super.onDestroy();
		if (mSession != null) { mSession.abandon(); mSession.close(); }
	}
App installer with following capabilities:
<ul>
<li> Install APK from Mainland into Island, and vice versa.
<li> Install app without user consent
</ul>
Created by Oasis on 2018-11-12.
installer/src/main/java/com/oasisfeng/island/installer/AppInstallerActivity.java