Android onCreate onResume

Question

I have a problem. When I start for the first time my android application, in the main activity both the onCreate and the onResume are called. but I want to be called only the onCreate.

What can I do?

Lochner

remove the onResume() if u don't want.it won't affect. – Sextant

Check this answer it may be useful: https://mcmap.net/q/80309/-android-activity-life-cycle-what-are-all-these-methods-for – Snowblink

Answer 1

According to the SDK docs what you are seeing is the intended behavior. Have a look at the flowchart in the docs for Activity - Activity Lifecycle.

Programmatically you can overcome this by keeping an instance member to track whether onResume has been called before - the first time it is called, set the variable and return e.g.

private boolean resumeHasRun = false;

@Override
protected void onResume() {
    super.onResume();
    if (!resumeHasRun) {
        resumeHasRun = true;
        return;
    }
    // Normal case behavior follows
}

Vamoose

When I try to do this, I receive a "Suspended (exception RuntimeException)" when I try to set resumeHasRun = true. Any ideas? – Modigliani

Instead of this you should use Activity's onRestart() method, it is intented exactly for that use case. – Leroylerwick

Provided that your activity gets stopped (onStopped()), then @FenixVoltres is correct, in that, you should use onRestart(). – Marlite

Answer 2

The correct answer is to use Activity's onRestart() method. This is probably what you have been looking for.

Leroylerwick

Not necessarily. onRestart() is called only if the activity has stopped. – Supination

You're right, but the answer to above question was to move code from onResume() (which is called also when activity is created) to onRestart(), which is not, what was the point. – Leroylerwick

@bowmanb Correct, but without knowing his intent, in most cases, onRestart() is what you'd want here. – Marlite

Answer 3

You can't do anything, as this is how the Activity lifecycle works.

See http://developer.android.com/guide/topics/fundamentals/activities.html#Lifecycle for a diagram that shows the lifecycle.

Disputatious

ok thanks.. so if the onResume is called any time there is no way to make the activity to behave in a certain way at a first access, and in another way when is called back.. am I right? – Lochner

@Lochner Yes, look at the onRestart() method. See @Fenix's answer. – Marlite

Answer 4

As you can see in the API the Activity Lifecycle always calls onResume before showing the activity. http://developer.android.com/reference/android/app/Activity.html#ActivityLifecycle

I guess you could make a global boolean for a first access and set it to false. Then override the onResume and check the variable. If false, set it to true and return, if true, call super.onResume.

Should work, but I don't know if it can be handled simpler and I don't have access to the sdk here to test it.

Murex