MovingButton | Android button which moves in eight direction | Android library

I tried to align the buttons and here is the result. I am trying the get the 3 buttons (left, down, right) to space evenly using MainAxisAlignment.SpaceEvenly, but some how they still stick together. Can someone point out for me the problem behind this and how to achieve the result I want?

Here is the result

I have a View which is contained in a Fragment. The View contains a number of "buttons" (Each "Button is an ImageView)(see screen 1) Screen 1

My objective is that when I click on one of these buttons a PopupMenu will appear (see screen 2) Screen 2

This is working well most of the time but on some "buttons", when the "button" is clicked, the PopupMenu does not usually show (although the toast message does appear indicating that the 'cick' has been registered).

The issue is apparent on the "button" in the top left corner and on buttons at the bottom of the fragment. Sometimes the menu appears (but usually after many 'clicks')

My working assumption is that, for some reason, the menu is not being displayed on the screen (I believe it is being displayed but is 'off screen'/not visible).

I have researched the issue but cannot find anyone with a similar issue.

I have tried different Gravity settings when creating the PopupMenu, but nothing made a difference.

The code I am using to create the PopupMenu appears to be classical.

Thanks in advance for any help you can offer me on this.

Extract from RemoteView.java

I am trying to write a program so that whenever the button called 'front' is pressed all other buttons will change to gray except the button that equals GreenButton. I am struggling with accessing the buttons in the for loop, and keep getting a null pointer exception.

The full logcat is shown below, showing that the NPE is occurring when I am trying to access the array in the loop