Making my 3 tab app responsive

I need to have my app responsive - meaning I need it to look the same no matter what Android phone its running on. I have the app completed but when testing in different android phone emulators it gets all messed up and positioned incorrectly. My app only has 3 pages (tabs) and the 2nd tab is fine but the 1st and 3rd tab is not. I have included the first tab layout the way it should look like and then the way it looks like in another Android phone type. I am the programmer who made this app. The app is made in Android Studio in Java.