强制 android 在选项卡更改时销毁片段？ (viewpager的生命周期)

Question

I have two tabs in my app with two RecyclerView that when I click on one item in the first tab it adds one item to the second tab (download link to download manager) but the user can't see the change until the fragment onDestroy and again onCreate (rotate, exit, going to the third tab) I think it happens because of the lifeCycle of fragment in viewPager that keeps the previous tab.

How can I force android to destroy fragment on tab change? I even tried setOnPageChangeListener with interface but it did not work for me, maybe because getItem only runs on fragment creation?

Answer 1

Instead of populating your list in onCreate(), you should do it in onResume(). Following the Android Activity lifecycle, as soon as your activity/fragment is inactive, onPause() is called - and as soon as you go back to it, onResume() is called. So if you are in another tab and switch to your second tab, onResume() will be called and you can create the list from there - no need to destroy the vieiw.

You can read more on the activity lifecycle here: https://developer.android.com/reference/android/app/Activity.html#ActivityLifecycle

Answer 2

override fun onPause() {

    list.clear()
    super.onPause()
}

add this code in your each fragment