How can restrict my EditText input to some special character like backslash(/),tild(~) etc by soft keyboard in android programmatically

Question

I am developing an application for keyboard, but i am geting an issue. I want to restrict/block some special character from soft keyboard in EditText in android programmatic

Answer 1

you can prevent for typing special character:

yourEditText.addTextChangedListener(new TextWatcher() {
      CharSequence previous;
      public void afterTextChanged(Editable s) {
        if(s.toString().contains("&^%$#*&(")){
              s.clear();
              s.append(previous.toString());
        }
      }

      public void beforeTextChanged(CharSequence s, int start, int count, int after) {    
            previous = s;
      }

      public void onTextChanged(CharSequence s, int start, int before, int count) {}
   });