Display automatically an Integer value from Edit Text (entered by the user) to Text View without any actions (such as onButtonClick) in Android

Question

Trying to get an integer from Edit Text entered by the user(such as Total Amount) and to display it by multiplying with value(such as 5%) and display it using TextView automatically.

For the 1st part i.e. simply displaying the integer from EditText to TextView got NumberFormatException Error.

''' temp = (Integer.parseInt(editText.getText().toString()));

textView.setText(temp);

'''

And for the second part i.e. automatically displaying the value from EditText to TextView, no idea how to approach.

score 1 · Accepted Answer · answered Sep 29 '20 at 10:18

Just use textwatcher and put the logic in it. Just make sure change the id of edittext and textview

et.addTextChangedListener(new TextWatcher() {
    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) { }
    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) { }
    @Override
    public void afterTextChanged(Editable s) {
        String value = s.toString();
        double outputValue = Integer.parseInt(value) * 0.05;
        textView.setText(String.valueOf(outputValue));
    }
});

Make sure in edittext that it only capture the numerical value.

score 1 · Answer 2 · answered Sep 29 '20 at 10:21

you could try this approach

    editText.addTextChangedListener(new TextWatcher() {
        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) { }
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) { }
        @Override
        public void afterTextChanged(Editable s) {
            String userInputText = s.toString();
        try {
            val userInputAsNumbger = userInputText.toInt();
        }catch (e:NumberFormatException){
            print(e.message)
        }
        }
    });

to ensure it doesn't error

Display automatically an Integer value from Edit Text (entered by the user) to Text View without any actions (such as onButtonClick) in Android

2 Answers2