Android: how to quit an activity without closing it when click on back button?

Question

I have a subActivity that can be open from my mainActivity.

For some reasons, when the user clicks on the back button go back to my mainActivity, I want my subActivity to remain open in background in order to be able to come back for later.

Questions:

how to avoid to close the subActivity when the user clicks back ?
how to come back to the mainActivity without restarting it ?
how to come back later to my opened activity without re-creating it completely ? (just want to bring it to front)

Thanks !

Don't finish your activity just change.

Farhana Naaz Ansari
– Farhana Naaz Ansari

2018-11-22 10:55:40 +00:00
Commented Nov 22, 2018 at 10:55 — Farhana Naaz Ansari
– Farhana Naaz Ansari, Commented Nov 22, 2018 at 10:55

toto_tata · Accepted Answer · 2018-11-22 11:11:44Z

On you subActivity onBackPressed() add this

@Override public void onBackPressed() { Intent i = new Intent(SubActivity.this, MainActivity.class); i.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT); startActivity(i); }

on mainActivity :

 private void openSubActivity() { Intent intent = new Intent(MainActivity.this,SubActivity.class); intent.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT); startActivity(intent); }

Thanks but how to come back to the mainActivity without restarting it ?
Ok, probably found the answer stackoverflow.com/questions/8688099/… for this last point

ʍѳђઽ૯ท · Accepted Answer · 2018-11-22 10:59:46Z

override onBackPressed() and remove super from it then try opening the activity which you want to open from there for ex-

 @Override public void onBackPressed() { // your code }

and with the help of different activity launch modes you can achieve it

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