Number of valid fragments in application?

Question

Is there any limitation in using of fragments in app? Can huge number of fragment s affect on performance of app?

Edit: I want to play movie with 5 minutes duration at most.

you can use same fragment to play different movies, 1 by 1 and yes, movies are quite heavy consumer — Pavneet_Singh, Sep 18 '18 at 04:44
I use one fragment class but adapter returns maybe 500 number of this fragment. — Samin Heydarian, Sep 18 '18 at 05:00
that will just be a video item (item title and thumbnail) which is fine — Pavneet_Singh, Sep 18 '18 at 05:02
at a time only play visible list item's videos with considering a pause duration in scrolling — Pavneet_Singh, Sep 18 '18 at 05:07
Yes just one. But if user swipes it saves current position of each playback and I think it should allocate a lot of memory. — Samin Heydarian, Sep 18 '18 at 05:17
use a threshold to avoid saving more than required, every problem comes with a solution (JNI, timestamp storage etc) — Pavneet_Singh, Sep 18 '18 at 05:19
and it depends on your data? what if you had 5000 items not 500? would you create 5000 instances of one fragment? — pskink, Sep 18 '18 at 05:44
Yes, it depends. Adapter returns instances based on list size. Could you help swipe between movies in one activity? — Samin Heydarian, Sep 18 '18 at 05:49
ok, so are you aware of `RecyclerView` or `ListView` or similar widgets? — pskink, Sep 18 '18 at 05:58
Do you know player can't be instantiated more than one? I release every player in `onStop()` callback of fragment. Is it possible to do this in `RecyclerView`? — Samin Heydarian, Sep 18 '18 at 06:06
player? what player? what actually do you want to achieve? you have a list of something (movies maybe) and ...? — pskink, Sep 18 '18 at 06:15
Imagin instagram global search playing video automatically one by one. I want this. Every player in android should release. I use `exoplayer`. — Samin Heydarian, Sep 18 '18 at 06:27

score 2 · Answer 1 · answered Sep 18 '18 at 04:41

2

Is there any limitation in using of fragments in app?

There is no limit

Can huge number of fragment affects on performance of app?

Yes, it surely can, reasons

Memory allocations
Cpu consuptions
Lifecycle manager (activity and fragment both)

Possible Solution

Enable large heap in manifest's application tag

android:largeHeap="true"
Use findFragmentByTag instead of creating fragments
Use back stack

answered Sep 18 '18 at 04:41

Pavneet_Singh

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How much memory allocate with some player like `Exoplayer`? each fragment. – Samin Heydarian Sep 18 '18 at 04:45
there is no exact calculation though it's depends upon the fragment class, number of members + video processing + exoplayer memory etc can be result into 100kb to (2-3) MB – Pavneet_Singh Sep 18 '18 at 04:48
@Pavneet_Singh How Using findFragmentByTag instead of creating fragments could help performance? – Alireza Noorali Sep 18 '18 at 04:50
avoid creating new fragment in case of rotation etc! – Pavneet_Singh Sep 18 '18 at 04:54

score 0 · Answer 2 · answered Sep 18 '18 at 04:38

0

Is there any limitation in using of fragments in app?

No, there is no limit in adding fragments in Android development.

Can huge number of fragment affects on performance of app?

its depend on What operation you will perform in fragments

answered Sep 18 '18 at 04:38

AskNilesh

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Playing movie with 5 minute duration at most. – Samin Heydarian Sep 18 '18 at 04:41
@SaminHeydarian where you are storing your `movies` – AskNilesh Sep 18 '18 at 04:43
In First time fetch url path from server. But after that I want to use cache. – Samin Heydarian Sep 18 '18 at 04:55
@SaminHeydarian and these movies are being played at same time? or do you release the media player after playing? – Atif Farrukh Sep 18 '18 at 04:55
@SaminHeydarian check this [Using cache in ExoPlayer](https://stackoverflow.com/questions/28700391/using-cache-in-exoplayer) – AskNilesh Sep 18 '18 at 04:56

score 0 · Answer 3 · answered Sep 18 '18 at 04:41

0

Using Fragments is dependent on App's functionality. It's Developer's Choisce to use Fragment's or not. If your app contains various different options and you needed to use Navigation Drawer, TabView or any Swipable view then in such condition using Fragment will be more suitable.

Adding and Replacing Fragment in your app should done in correct manner and as per need. If it then it will not affect the performance of your app and there is no such limitation on certain number of using Fragments. You can add it as per your need.

Hope it helps.

answered Sep 18 '18 at 04:41

Jaimin Modi

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I want to show a list of movies(maybe 500) in fragments and use pagination too. I think using fragment can help user to swipe and see movie easily. but I don't know how does it affects on performance of app. – Samin Heydarian Sep 18 '18 at 04:50
For only seeing movie list you may or may not use the Fragment. You can do the same work simply in your Activity as well. I think here there is not need to take Fragment. If you are dealing with multiple options in same activity then you should take fragments in order to move or navigate from each other. – Jaimin Modi Sep 18 '18 at 05:10
So can swipe in one activity? – Samin Heydarian Sep 18 '18 at 05:36
Ya you can swipe in one Activity by using Tab Layout in an Activity. You can also use Viewpager for scrolling multiple fragments. – Jaimin Modi Sep 18 '18 at 05:48
Both of `Tab layout` and `View pager` use fragment. And this is my problem. – Samin Heydarian Sep 18 '18 at 05:58
Samin don't be messy. Please explain clearly what you want to do. – Jaimin Modi Sep 18 '18 at 05:59
Imagin instagram global search playing video automatically one by one. I want this. – Samin Heydarian Sep 18 '18 at 06:10
Put your own efforts first pls. – Jaimin Modi Sep 18 '18 at 07:12

score 0 · Answer 4 · answered Sep 18 '18 at 04:51

You can combine multiple fragments in a single activity to build a multi-pane UI and reuse a fragment in multiple activities.

The Fragment performing is important to get a good performance. Should handle right way like memory(cache,addBackStack,etc.,)

https://developer.android.com/guide/components/fragments#Transactions

Number of valid fragments in application?

4 Answers4