Keep Score

Android apps are made of Screens. You’ve created your first question on one Screen, and you’re going to want to add more. You’ll put the questions on new screens, but you need a way of keeping score between those screens. On this card, you’ll be adding a TinyDB database to keep the score in, and some code to mark the right answer!

• First, in the Palette section in Storage, find the TinyDB component and drag it on to the Viewer. You won’t see anything new there, but TinyDB1 should appear in the Components section.

Now it’s time to start putting together the code that will power your quiz!

• In the top right-hand corner of the screen, click on the Blocks button to access the Blocks view.

Just like the previous Designer screen, this Blocks screen has sections:
Blocks, where you pick code blocks
Viewer, where you drag your code blocks to assemble them

There are lots of kinds of code blocks — you’re just going to need a few of them for now.

• In the Blocks section, click on whichever button matches the right answer to your question. For me, it was Button1. Grab the When Button1.Click do block and drag it onto the viewer.

• Now click on TinyDB1 and choose the call TinyDB1.StoreValue block. Drag it so it’s inside the previous block, and then go to the Built-in blocks and attach the pieces from Math and Text to make it look like this:

• Finally, update the Text value to score and the number to 1, like this:

What you’ve done is to store the value 1 (as in one point for a right answer) under the label score in the TinyDB database. You can pull it back out and change it on later screens. This way, you can keep score throughout the app, no matter how many questions you add!