private TextWatcher filterTextWatcher = new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
// DO THE CALCULATIONS HERE AND SHOW THE RESULT AS PER YOUR CALCULATIONS
int radius = 0;
radius = Integer.valueof(s.toString);
double area = Math.PI * radius * radius;
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void afterTextChanged(Editable s) {
}
};