Enable and disable Button according to the text in EditText in Android

Question

I want to disable by Button if the words in the EditText is less than 3 words, and if the words in the EditText are more than 3 words then I want to enable it so that it can

Answer 1

The problem with using afterTextChanged alone is at application start it can't disable the button initially until you start typing to your EditText.

This is how I implemented mine and it works great. Call this method inside your Activity's onCreate method

void watcher(final EditText message_body,final Button Send)
{
    final TextView txt = (TextView) findViewById(R.id.txtCounter);
    message_body.addTextChangedListener(new TextWatcher()
    {
        public void afterTextChanged(Editable s) 
        { 
            txt.setText(message_body.length() + " / 160"); //This is my textwatcher to update character left in my EditText
            if(message_body.length() == 0)
                Send.setEnabled(false); //disable send button if no text entered 
            else
                Send.setEnabled(true);  //otherwise enable

        }
        public void beforeTextChanged(CharSequence s, int start, int count, int after){
        }
        public void onTextChanged(CharSequence s, int start, int before, int count){
        }
    }); 
    if(message_body.length() == 0) Send.setEnabled(false);//disable at app start
}