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I need to know if there is ever an instance when onResume will be called before onCreate has been called at least once. Thanks.
Edit: Judging by the activity life cycle, it doesn't seem so. But I want to double check.
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This state is just what you said. When the app has been sitting, unused, for about 55-60 seconds or so,the android OS will do something to protect the system,eg. save the power, so we can still see it ,but it indeed lost the focus. So when we reuse the app, we will call the method: onPause()-->onResume() .
onResume() is called whenever you navigate back to the activity from a call or something else. You can override the onResume method similarly as onCreate() and perform the task.
onStart() -> called when the activity becomes visible, but might not be in the foreground (e.g. an AlertFragment is on top or any other possible use case). onResume() -> called when the activity is in the foreground, or the user can interact with the Activity.
As onCreate() of an Activity is called only once, this is the point where most initialization should go: calling setContentView(int) to inflate the activity's UI, using findViewById to programmatically interact with widgets in the UI, calling managedQuery(android.
onResume() will never be called before onCreate().
Read more about it in the Activity Lifecycle
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onResume() will always be called when the activity goes into foreground, but it will never be executed before onCreate().
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