Launch App1 from App2,then press home button to the home screen,and open App1 again by press icon,why onCreate get called?

Question

I launched App1 from App2, and here are the methods in App2:

Intent resolveIntent = getPackageManager()
    .getLaunchIntentForPackage("com.example.weijunhao.launchmode");
startActivity(resolveIntent);

Then I press the home button to go to the home screen and I open App2 by pressing the launch icon.

Why does the onCreate method get called and not the onRestart method?

post your manifest (for both apps) please – David Wasser Apr 03 '17 at 16:13 — David Wasser, Apr 03 '17 at 16:13

score 1 · Answer 1 · answered Mar 29 '17 at 17:34

When an Activity is no longer visible (like when you press the home button) it goes to the stopped state. From that state it may need to go through the onCreate() method if the system has killed the process to release memory for apps in the foreground (or system processes, I suppose).

There's a nice life-cycle diagram in Android documentation.

Launch App1 from App2,then press home button to the home screen,and open App1 again by press icon,why onCreate get called?

1 Answers1