Question

I’m making a calculator in android, but for some reason it won’t let me read from the edit text. this is the code i used to declare the edit text:

final EditText AnswerBox = (EditText) findViewById(R.id.AnswerBox);

This is the code for one of the buttons:

one.setOnClickListener(new View.OnClickListener() {    
        public void onClick (View v)   {   
            AnswerBox.append("1");
        }
    });
}

This is the method that reads the number:

public Double number_reader()

{
    Double num1;
    String s;
    s=AnswerBox.getText().toString();
    num1=Double.valueOf(s);

    return num1;

}

The issue is with the AnswerBox in the number_reader method, it says it can’t be resolved..

Answer 1

You probably declare AnswerBox in the onCreate method:

final EditText AnswerBox = (EditText) findViewById(R.id.AnswerBox);

and now AnswerBox is a local variable and it doesn’t exist outside the onCreate method so it can’t be found in the method number_reader.

To resolve it make a private field in your class :

private final EditText AnserBox;

and then in the onCreate method do this:

AnswerBox = (EditText) findViewById(R.id.AnswerBox);