You can make your Android application to be displayed only in portrait mode using Titanium by making following changes.
1.Create directory platform/android in your project directory.
2.Copy AndroidManifest.xml file from build/android directory and paste it inside platform/android that you have already created.
3.Edit the AndroidManifest.xml file inside platform/android directory by adding android:screenOrientation=”portrait” in all activity tag.
4.Then for each activity tag remove |orientation from android:configChanges section.
After changing the activity tag, it will look like this