Using the TensorFlow Magenta multi-style model in Android

Although the TensorFlow Android example app already has code that uses the multi-style model (actually we used the model from the Android example app in our iOS app in the previous section), the TensorFlow-related code in the example app is mixed with a lot of UI code in the over 600-line StylizeActivity.java file. There's also a Codelab for TensorFlow Android Style Transfer (https://codelabs.developers.google.com/codelabs/tensorflow-style-transfer-android/index.html) you can go through, but the code there is about the same as the TensorFlow Android example app. Since we already have a minimalist implementation of an Android app using a TensorFlow fast-style transfer model, it'd be interesting to see how we can change just a few lines of code and have a powerful multi-style style-transfer app. This should also...