Android app getting closed every time I am running this "if else" conditional statement in an Onclick listener for a button

I am a beginner in android, and currently I am working on an app which requires usage of a else if statement. Below is the code snippet of the same:

submit.setOnClickListener(new OnClickListener() {
  @Override
  public void onClick(View v) {


    if ((CCValue.equals("3") && MVValue.equals("3.5")) || (CCValue.equals("3") && MVValue.equals("4")) || (CCValue.equals("3") && MVValue.equals("5")) ||
      (CCValue.equals("4") && MVValue.equals("4.5")) || (CCValue.equals("4") && MVValue.equals("5")) || (CCValue.equals("5") && MVValue.equals("5"))) {

      thresholdValue = 1;

    } else {
      thresholdValue = 0;
    }

    threshold.setText(thresholdValue);

  }
});

Submit is the name of the button on which the user will click, and the compiler will go in the "if" statement. CCValue and MVValue are string variables, which I am saving from two spinners selected by the user. "thresholdValue" is an integer variable which will get value according to the if statement. Finally "threshold" is an EditText component.

Now I am trying to compare the values stored withing the string variables through the "if" condition. But every time whenever I am clicking on the submit button the app is getting crashed. What changes should I make to make this code run successfully?