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Snag is a spam filter for Android. The idea is to intelligently detect and block spam by matching content against trained data. You can read more about it here: https://kehers.github.com/2014/09/07/building-an-sms-spam-filter.html

Unfortunately, I have to stop further development. The way Snag should work is

1. Intercept incoming SMS
2. Match against trained data
3. If spam, save in a separate db and block from reaching the phone message inbox (or any other message app)

1 and 2 work already. However, from Android 4.4 (Kitkat), you can no longer block SMS from other messaging apps. More details about this here. Well unless you develop a full featured SMS application. In other words, while Snag will work for Android versions < 4.4, it won't for >= 4.4 as not being able to stop messages from the message inbox defeats the purpose.

If you are interested in developing it for < 4.4, this source is a good headstart for you. I have done the heavy work already. The only things left to do are:

1. Create single message view. (The list view for all messages done already)
2. Allow users add a message to the training data (using the + icon)
3. Let users delete and "un-spam" a message
4. Add boring static content - about, feedback, rate

Another thing you can use this for is to create an app that listens to incoming messages to perform an action - OTP verification for example. Just strip away the spam classification part and use the SMSListener part.

You will find the database in /assets/snag.db. It includes sample training data.

Icon credits from Noun Project

MIT