Android stop countdown timer when moving to another activity

@Override
public void onFinish() {
    val = 0; 
	// When time finish go for mainActivity
    Intent intent = new Intent( faqActivity1.this, faqActivity2.class);
    intent.putExtra("key", val);
    intent.addCategory(Intent.CATEGORY_HOME);
    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    startActivity(intent);
    cancel(); // stop countdown
    finish();
}