CODEWITHSUNDEEP
androidandroid-activityandroid-lifecycle
Code Painters
Code Painters

Reputation: 7275

How to check if the Activity is visible? onResume is not enough

One of my activity embeds VideoView to play some content. I implemented pausing/resuming the video in onPause() and onResume(), respectively, but to my surprise - onResume is called before the activity is really visible to the user.

To be exact, the scenario is as follows:

I confirmed this behaviot with Android 2.2, 2.3 and 4.0. I guess it is intentionally done like that, to let the activity prepare to redraw itself immediately after locking screen goes away.

How can I detect the moment when the activity actually appears to the user? I've tried to wait for onWindowFocusChanged(true) being called, and it seems to work, but it doesn't make me feel perfectly safe.

Upvotes: 5

Views: 9744

Answers (2)

GeekYouUp
GeekYouUp

Reputation: 1651

You need to wait for the onWindowFocusChanged event as well as the OnResume event. It's a well known issue that no longer occurs in Android 4.1+. Details are available at http://android-developers.blogspot.co.uk/2011/11/making-android-games-that-play-nice.html

Upvotes: 8

Andy Res
Andy Res

Reputation: 16043

In general onResume should be enough, but for your special case I believe you should resume the video not on onResume(), but when the user has unlocked his screen.

To achieve this you will need to make a BroadcastReceiver that listens for an intent called: Intent.ACTION_USER_PRESENT, and in onReceive resume your video.

Intent.ACTION_USER_PRESENT:
Sent when the user is present after device wakes up (e.g when the keyguard is gone).
This is a protected intent that can only be sent by the system.

Upvotes: 0

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