Deploying the app so far

Follow these simple steps to run the app on the default Android emulator:

You're done. Here is what the app looks like so far in the emulator. Remember that you might (probably do) have a different emulator, which is fine:

Clearly, we have more work to do before we move to Silicon Valley and look for financial backing, but it is a good start.

We need to test and debug our apps often throughout development to check for any errors, crashes, or anything else unintended.

It is also important to make sure it looks good and runs correctly on every device type/size that you want to target. Obviously, we do not own one of each of the many thousands of Android devices. This is where emulators come in.

Emulators, however, are sometimes a bit slow and cumbersome, although they have improved a lot recently. If we want to get a genuine feel for the experience our user will get, then you can't beat deploying to a real device. So, we will want to use both real devices and emulators while developing our apps.

If you want to try out your app on a tablet, you're going to need a different emulator.

Now we can look at how we can get our app onto a real device.

The first thing to do is to visit your device manufacturer's website and obtain and install any drivers that are needed for your device and operating system.

The next few steps will set up the Android device for debugging. Note that different manufacturers structure the menu options slightly differently to others. But the following sequence is probably very close, if not exact, for enabling debugging on most devices:

We are now ready to learn some Kotlin and add our own Kotlin code to the Hello World project.