How to set textview as method output in andrioid?

Question

I have just started to use android studio recently and currently I am working on a Roman Numeral Translator app. The app\'s interface looks like this: Application interface<

Answer 1

You need to make your TextView a class member and initialise it in your oncreate bundle, so that you can access the textview elsewhere in the activity.

TextView numeralInput;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.act_main);
    numeralInput = (TextView) findViewById(R.id.textView);

convert.setOnClickListener(
            new View.OnClickListener() {
                public void onClick(View v) {

                    String intValue = numeralInput.getText().toString();
                    try{
                        int integer = Integer.parseInt(intValue);
                        if (integer > 0 && integer <= 4999){
                            translator(integer);

                        }else{
                            numeralInput.setText("Please enter an integer between 0 and 4,999.");
                        }

                    }catch(NumberFormatException e){
                        numeralInput.setText("Invalid input try again.");
                    }
                }
            }
    );

Answer 2

Make your translator() method return a string which contains the final output.

So before the while statement in that method, declare a string such as String result = null; and in the loop append the popped values to this variable like, result += stack.pop().

Now, the place where you call the translator(integer) method, do numeralInput.setText(translator(integer)) instead of translator(integer)