How do I make my Android apps fit all screen sizes?
Simple, use relative layout with the set margin code. Set the margins between each text view, button, etc and it will look the same on every phone. android:layout_marginTop="10dp" // change Top to Bottom, Left or Right for what you need.
How do you split the screen on a phone?
You can use split screen mode on Android devices to view and use two apps simultaneously. To enter split screen view, open "Recent Apps," long-press an app, and then tap "Split Screen." On Galaxy devices, tap an app's icon in "Recent Apps" and select "Open in split screen view."