Crash on Samsung S5 running Android 6.0.1

[medavox]

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.github.palmcalc2019.palmcalc/com.github.palmcalc2019.palmcalc.PalmCalcActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object android.content.Context.getSystemService(java.lang.String)' on a null object reference
	at com.github.palmcalc2019.unit.AbstractWheelTextAdapter.<init>(AbstractWheelTextAdapter.java:75)
	at com.github.palmcalc2019.unit.AbstractWheelTextAdapter.<init>(AbstractWheelTextAdapter.java:65)
	at com.github.palmcalc2019.unit.AbstractWheelTextAdapter.<init>(AbstractWheelTextAdapter.java:60)
	at com.github.palmcalc2019.unit.ArrayWheelAdapter.<init>(ArrayWheelAdapter.java:43)
	at com.github.palmcalc2019.unit.AndroidQAActivity.IntwheelSelector(AndroidQAActivity.java:434)
	at com.github.palmcalc2019.unit.AndroidQAActivity.onStart(AndroidQAActivity.java:124)

[medavox]

caused by passing global static Context object to a new class instance.

The value of the ctx variable is old, from the last program run.

So when this is passed to a new ArrayWheelAdapter instance, which tries to use it to get a layout inflater, the context being used is null, and an NPE is caused.

key method (was AndroidQAActivity.java:434, now somewhere in ConverterFragment):

private void IntwheelSelector(int id, String[] change) {
//...
		wheel.setViewAdapter(new ArrayWheelAdapter(ctx, change));
//...
	}