I am recently making my first Android App and it has a Edittext area which plans to only allow users to input correctly spelled words. Basically I have already learned how to use layout properties such as Android:inputType to detect any misspelled words. Any misspelled words should be marked with a red underline. But I cannot find a way to prevent users from inputting misspelled words.
The ideal situation is: if a user has input any misspelled words and clicks the submit button, a prompt message (for example a Toast message) would appear to inform the user to modify misspelled words before they can really submit.
Follow steps from this link to create a spelling checker. http://www.tutorialspoint.com/android/android_spelling_checker.htm
Then modify the sample code above to meet your requirement: E.g. When (arg0.length == 0), that means there is no suggestion (no spelling mistake), you can create validation from here. However, it could be a word that is not written in English. So you would need a language detection:
https://code.google.com/p/language-detection/ (From: How to detect language of user entered text?)