We are going to use MIT app inventor 2 to create our Android app. Its very simple to use and easy to integrate win Google firebase.

Download attached MIT app inventor 2 project file (.aia file).

Go to MIT app inventor 2 home page and login to your account. Then go to projects >> import project . Select the file from your computer and upload it.

. Select the file from your computer and upload it. Go to layout window, click on firebaseDB1 (located at bottom of the workspace), enter database URL and secret key. Also set ProjectBucket as S_HO_C_K (as shown in screenshot 2).

After that, click on the build button and save app file (.apk file) to your computer. Later transfer that file to your Android device.