Using from_keras_model() will give you a model that expects the same input that you pass to predict(), so you’ll need to do the same pre-processing.
If you’re performing text classification in your Android app, you might find the TF Lite Task Library helps. When you convert the model, you’ll need to add metadata (example here 1), and then you can use NlClassifier 1 (reference) in your app:
List<Category> results = classifier.classify("I love a cat");