how to get the button to be gray is the editText is empty

Question

hey can someone please help my i'm trying to met the button gray if there is no text in the editText1_id and the editText1_passcode

sportbetting.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view){

                if(sportbetting)
                    sportbetting.getBackground().setColorFilter(Color.GRAY, PorterDuff.Mode.MULTIPLY);
                else
                    sportbetting.getBackground().setColorFilter(null);

                if( editText1_id.length() < 4 && editText1_passcode.getText().length() < 4){
                    Toast.makeText(getApplicationContext(), " Please complete your UserID and Passcode before you can continue", Toast.LENGTH_SHORT).show();
                }else {
                    userId = editText1_id.getText().toString();
                    passcode = editText1_passcode.getText().toString();
                    Intent intent = new Intent(Login_Activity.this, Main_Activity.class);
                    startActivity(intent);
                    finish();
                }
            }

        });`