The keyboard also implements a KeyboardActionListener, whose primary job is to handle touch events like typing and gestures and then send updates to the text editor through the InputConnection interface. On Android, a keyboard is an app whose state and visibility is controlled by a service component called the InputMethodService. The Android documentation gives a good overview of implementing an IME, so we’ll just briefly mention the main points. If this sounds interesting, read on for a peek into what building a keyboard app is like.Ī keyboard on Android is called an IME, or input method editor. All of this happens in 10s of milliseconds. Another thread fetches a list of synonyms for the current word and shows them in the “suggestion strip” above the keys. The keyboard looks for suggestions from its on-device models, and as that request is being processed, it also checks with the backend to get an in-depth analysis of the text you typed. Each keypress on the Grammarly Keyboard triggers a number of concurrent events. The UI is constrained and constantly changing. This blog post will look at Android in particular, where the Grammarly app is unique-in that unlike most Android apps, it’s not an activity or a fragment. The decision to build the Grammarly app as a native keyboard has introduced our team to some fascinating and complex problems in mobile app architecture, UX, performance, and testing. ![]() The Grammarly Keyboard on Android is used over 70 times per day by the average user, and it meaningfully impacts how people communicate using their phones. The motivation behind building a keyboard, as opposed to a traditional mobile app like a text editor, is the same principle behind Grammarly’s browser extension: the writing assistant should be available wherever the user is writing. The Grammarly app on both Android and iOS is a native keyboard.
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