Cannot fix Java null pointer error

Question

I have some code that when I run it returns a null pointer error. This is the code and error from the logcat:

import android.support.v7.app.AppCompatActivity;
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Answer 1

The problem is this line:

!textViewString.equals()

Because you've not given the value to the textViewString anywhere before using it. Assign it to an empty string at least, or simply delete that line since at the moment it's not doing you much good, I don't really get it's point. Since you're nowhere changing it's value, none of your buttons will work (even without the exception).