Question

I am new to Android development and am working on a simple practice project where the user enters a number into two EditText fields and presses a Button labeled “Calculate” and the sum of the two numbers is displayed. Here is the code I have so far, but I don’t know how to add the two string values and output it to a TextView field named “answer”:

public void calNumbers(View view) {
    EditText text = (EditText)findViewById(R.id.edit_number1);
    String value = text.getText().toString();       

    EditText text2 = (EditText)findViewById(R.id.edit_number2);
    String value2 = text2.getText().toString();              

    TextView answer = (TextView) findViewById(R.id.answer);      
}

Answer 1

You’ll have to convert them to numbers (int, float, long, etc) to preform your arithmetic. Then convert the result back to a String to display in a TextView

int val1 = Integer.parseInt(value);
int val2 = Integer.parseInt(value2);

answer.setText(String.valueOf(val1 + val2));