stop countdown timer when exiting an activity
@Override
public void onFinish() {
val = 0; // When time finish go for mainActivity
Intent intent = new Intent( second_five_questions_questions_1.this, second_five_questions_questions_2.class);
intent.putExtra("key", val);
intent.addCategory(Intent.CATEGORY_HOME);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
cancel(); // add this to cancel out countdown
finish();
}