how to toast a message if editText is empty by clicking button?

Question

i have 2 edit Text in my application, 1 button to add the input numbers in the edit Text and 1 text view to display the result. I would like to put a toast message if my edit te

Answer 1

when user clicks button check:

if (editText1.getText().toString().trim().length() <= 0) {
    Toast.makeText(MainActivity.this, "It's empty", Toast.LENGTH_SHORT).show();
}

trim it to avoid blank spaces.