How to save state of imageButton?

Question

Java

boolean flag = true;
......
imageButton.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                if (flag)
                {
                    imageButton.setImageResource(R.drawable.ic_alarm_on1);
                alarm();}
                else {
                    imageButton.setImageResource(R.drawable.ic_alarm_on);
                alarmoff();}
                flag = !flag;
            }
        });

Please
write a working code
.