当我从 EditText 中删除所有内容时，为什么我的应用程序停止了？

Question

I want to check if the value of EditText is greater than 5, I want the background of the edittext to become RED and it does so but stops when I delete the Text. Please help.

  vibration.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            vibration.setBackgroundColor(Color.YELLOW);
        }

        @Override
        public void afterTextChanged(Editable s) {
            float numV = Float.parseFloat(vibration.getText().toString());
            if(numV > 5){
                vibration.setBackgroundColor(Color.RED);
            }else{
                return;
            }
        }
    });

Answer 1

first check if the the value you are getting from EditText is not null.

if(!yourEditText.isempty)
{
//Do your work here
}
else{
//EditText is null}