CODEWITHSUNDEEP
android
khushi
khushi

Reputation: 11

How to ensure only even numbers are entered in edittext in textwatcher?

I need to enter only even numbers(range:0-20) in edittext in textwatcher. However, when i did the following, it remained same that is it is allowing both even and odd numbers to be entered. I want when a user enters an odd number the toast is displayed. guide me please!

even

        @Override
        public void afterTextChanged(Editable s) {
            try {

                int v = Integer.parseInt(s.toString());
                if(v%2!=0){
                if (v > 20) {
                    s.replace(0, s.length(), "", 0, 2);
                } else if (v < 0) {
                    s.replace(0, s.length(), "", 0, 1);
                }
              }
            } catch (NumberFormatException ex)

            {
                Toast.makeText(MainActivity.this, "invalid", Toast.LENGTH_LONG).show();
            }
        }

Upvotes: 1

Views: 340

Answers (1)

Luis Miguel Sierra
Luis Miguel Sierra

Reputation: 734

You are just showing the Toast when a NumberFormatException exception is thrown, meaning that the string does not contain a number. So you have to show the toast also when the number is even, and you will do it on the else condition of 

if(v%2 != 0){
   //Number is odd
}else{
   //Number is even
}

Try like the following:

    @Override
    public void afterTextChanged(Editable s)
         try {
             int v = Integer.parseInt(s.toString());
             if(v>0 && v<20){
                   if(v%2 != 0){
                        Toast.makeText(getContext(), "ODD", Toast.LENGTH_SHORT).show();
                   }else{
                        Toast.makeText(getContext(), "EVEN", Toast.LENGTH_SHORT).show();
                   }
              }else{
                     Toast.makeText(getContext(), "OUT OF RANGE", Toast.LENGTH_SHORT).show();
             }
          }catch (NumberFormatException e){
                  Toast.makeText(getContext(), "INVALID", Toast.LENGTH_SHORT).show();
          }
        }

Upvotes: 2

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