What happened to activity when back is pressed

Question

Very simple for experts but i dont know how to search it. So my question is

Which method will create when back arrow is pressed(not menu/soft back button) go to home/parent activity?? i am talking about green circle button not red circle button

Is it onStop(),onPause() or onRestart()??

I am confused with all, though i have read the method but i cannot link it with my project.

Basically user on A activity perform some task and when user go back to parent activity then again perform some other task and when again come to A activity then some task also have to perform?

So which method suits?

Try to clarify a bit more your case. Add also what have you tried. You may need useful the [activity lifecycle](https://developer.android.com/guide/components/activities/activity-lifecycle.html). Also what do you mean with "back arrow is pressed(not menu/soft back button)"? Are you refering to [up navigation](https://developer.android.com/training/implementing-navigation/ancestral.html)? — Alberto S., May 25 '17 at 15:26

score 2 · Accepted Answer · edited Jun 20 '20 at 09:12

2

Edit

As OP edited the question

So it is about "What is the difference between Action Bar back button and Navigation Back button"

ActionBar "back" button (Green circled) is an "Up" button and it would take you to one level back on your app's navigation hierarchy.

The back button (Red circled) takes you to the last place you were at.

So, Whenever you push back button (< Up) current activity gets destroyed and onDestroy is called and onCreate will be called for the activity that will come up on stack.

Refer this link for more info: http://developer.android.com/design/patterns/navigation.html

Following methods are called in serial, after pressing back button.

onPause()
onStop()
onDestroy() //Activity destroyed.

These methods are called when an activity is launched.

onCreate()
onStart()
onResume()

For more info refer:

https://developer.android.com/guide/components/activities/activity-lifecycle.html

edited Jun 20 '20 at 09:12

Community

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answered May 25 '17 at 15:27

Mayank

46
4

i have edited my post – Nilesh Indalkar May 25 '17 at 15:37
cleared doubts about up button!!!! but what for back button(Red circle)? is it `onPause()` an then `onRsume()` – Nilesh Indalkar May 25 '17 at 16:12
will try it and if it works i will accept the answer!!!! – Nilesh Indalkar May 25 '17 at 17:07

score 0 · Answer 2 · answered May 25 '17 at 15:25

As obvious as it sounds the method that is called when the back button is pressed is onBackPressed():

@Override
    public void onBackPressed() {
        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        if (drawer.isDrawerOpen(GravityCompat.START)) {
            drawer.closeDrawer(GravityCompat.START);
        } else {
            super.onBackPressed();
        }
    }

Since my Activity implement a navigation Drawer it does manage it and if it's open and you press the back button, it will close

Then of course as the activity ends the onPause() and onStop() methods are called.

When the activity is resumed again the onResume() method will be called

i have edited my post – Nilesh Indalkar May 25 '17 at 15:37 — Nilesh Indalkar, May 25 '17 at 15:37

score 0 · Answer 3 · answered May 25 '17 at 15:25

0

The lifecycle methods which will be called when pressed back button are

onPause()
onStop()

So the current activity will still in stack uncless it is cleared. So again if the user goes to the activity it will call the onRestart() method.

answered May 25 '17 at 15:25

nitish29

327
1
7

i have edited my post – Nilesh Indalkar May 25 '17 at 15:37

What happened to activity when back is pressed

3 Answers3