android.widget.Button cannot be cast to android.widget.EditText

Question

Developing my first Android calculator application, I succeeded in updating a TextView in a new activity by passing the answer via an intent, but this requires the user to h

Answer 1

I followed the steps in the answer (cleaned and then made sure it's the id) and noticed that going to the source of my EditText R.id brings me to the EditText. Thought this is definitely not a IDE cache problem.

What I did do is to change the LinearLayout

android:layout_width="fill_parent" 
android:layout_height="fill_parent"

to

android:layout_width="match_parent"
android:layout_height="match_parent"

For some reason it fixed the issue (I had this whole layout wrapped in something else that I just recently removed).