![]() Original thread that created a view hierarchy can touch its views. That why the app throws the following exception and make your app crash.Ī$CalledFromWrongThreadException: Only the From your code, because you update UI (changing TextView content in minusOneSecond function). Once your solution passes all the tests, you can submit your solution using the "Submit" button.Problem: Timer class uses a background thread with a queue to queue and execute all tasks sequentially. If a track supports this, instructions on how to use this feature are shown on the right-hand side. Some tracks do support print-based debugging, where your code can output text that is displayed in the results. The online editor does not have an integrated debugger. Once the tests have run, the test results will be displayed on the right. The right-hand side contains the instructions that explain what is expected of youĬlicking on the "Run Tests" button will check if your solution passes the exercise's tests.The left-hand side contains the editor in which you'll code your solution.This will open the online editor, which shows the following information: There, you can click on the "Open in editor" button. To start doing that, go to the website, join a track and go to the exercise's page. Such an implementation is known as a solution. The goal of each exercise is to create an implementation that passes all the tests. With the online editor, you don't have to install anything on your local machine, everything works within the browser (including running the tests). ![]() ![]() Solving exercises online using the website's online editor allows you to quickly get started with a track.
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