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](http://i.stack.imgur.com/930ls.png)

The user will use the keypad to input a integer which will show up on the TextView shown above. When they hit the convert button it will take the integer they have entered and convert it (the program will be able to catch the input if contains a string or character). Then the app will reset the TextView to the result after the user hits the "convert" button. 

Currently, my main activity contains the onClickListeners for the buttons and a separate translator method for the translations. My problem is with the "convert" button I'm not sure how to get the input from the translator method and set it as TextView when it finishes converting. Here is the sample of my code: 

"Convert" button listener- `

```
convert.setOnClickListener(
                new View.OnClickListener() {
                    public void onClick(View v) {
                        TextView numeralInput = (TextView) findViewById(R.id.textView);
                        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.");
                        }
                    }
                }
        );

```

`

Translator Method- `

```
public static void translator(int integer) {
        LinkedList<String> stack = new LinkedList<String>();
        // if (integer > 0 && integer <= 4999) {
        //ArrayList<Integer> placement = new ArrayList<Integer>();
        int place = (int) Math.log10(integer);
        for (int i = 0; i <= place; i++) {
            //while(integer > 0){
            //System.out.println(integer);
            int placeOfValue = integer % 10;
            //stack.push(placeOfValue);
            //System.out.print(stack);

            //System.out.print(placeOfValue +":" + i);
            String placement = "";
            switch (i) {
                case 0:
                    placement = ones(placeOfValue);

                    break;
                case 1:
                    placement = tens(placeOfValue);

                    break;
                case 2:
                    placement = hundreds(placeOfValue);

                    break;
                case 3:
                    placement = thousands(placeOfValue);

                    break;
                default:
                    break;
            }

            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD) {
                stack.push(placement);
            }
            integer = integer / 10;

            //System.out.print(placement);
            // System.out.println(placement.size());
            //}
//              for(int j = 0; j < placement.size(); j++){
//                                    double tenthPower = Math.floor(Math.log10(placement.get(j)));
//                                    double place = Math.pow(10, tenthPower);
//                                    System.out.println(place);
//
//              }
            // }
            while (!stack.isEmpty()) {
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD) {
                    System.out.print(stack.pop());
                }
            }
//        } else {
//            System.out.println("Please enter an integer between 0 and 4,999.");
//        }

        }
    }

```

`

The other methods inside translator is like a library for the roman numerals each containing a numeral for each of the place values as shown below.

Thousands method- ` 

```
public static String thousands(int integer) {
        String thouValue = "";
        switch (integer) {

            case 1:
                thouValue = "M";
                //System.out.print("M");
                break;
            case 2:
                thouValue = "MM";
                //System.out.print("MM");
                break;
            case 3:
                thouValue = "MMM";
                //System.out.print("MMM");
                break;
            case 4:
                thouValue = "MMMM";
                //System.out.print("MMMM");
                break;
            default:
                thouValue = "";
                break;
        }
        return thouValue;
    }

```

`