In google play, if you enter a screen that uses tabs, you can notice how you can scroll each tab but the panel that seen to contain the tabs also moves vertically to a certain extent. I can imagine that it accomplishes the movement of the tab panel with a TranslateAnimation and a layout animations. But what I can't understand is how it decouples the content of the tab from the tab panel.
To answer the decoupling of the tabs and content question; I have implemented this before using 2 sets of tabs. One is in the content as a list header, the other is layered on top of the list in a containing FrameLayout so it's 'floating'.
Using scroll callbacks you can change the visibility of the floating tabs to suit your needs. Once the list header tabs moves off the screen make the floating tabs visible, once they move fully back onto the screen hide the floating tabs.
Just ensure that every time you show/hide tabs that you copy the values for horizontal scroll position and selected tab from the currently visible tabs to the ones that are about to become visible. works a treat.
The best open-source project you can find for this Android-ObservableScrollView
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I'm writing an app with multiple tabs. Every tab is a fragment and every tab uses the same layout file. You can change to the next tab by swiping (handled by a SwipeAdapter). Inflating the same layout for every tab again is quite inefficient and makes the app lag. Is there a way to inflate the layout once in the beginning and to reuse the inflated layout for all tabs?
Or alternatively, is there a way to do so with e.g. three inflated layouts? (-> one for each the currently displayed tab and both neighbours, so when you swipe from tab 4 to 5, the inflated layout of tab 3 - which is not needed anymore - is used for tab 6)
I know you can reuse inflated views with a listview, but it wouldn't work here because I want the user to swipe instead of continuous scrolling.
Welcome to StackOverflow. Use RecyclerView with a SnapHelper (works both horizontally and vertically). If you Google it you will find many tutorials.
Alternatively you can use ViewPager2, which is in alpha state (if you can wait for it to be stable). It is based in RecyclerView, and is an update to the old ViewPager to bring it to 2019. See this tutorial for example Hands on With ViewPager2. See also ViewPager2 releases page at Google to keep track of development progress.
So I have a single activity that controls a viewPager and this viewPager controls five fragments. In one of the fragments, there is an ImageView.
I want this imageView transit to the next page when I do a swipe left. More specifically, the position of this imageView will transit as I am swiping and once the swiping is done and the next fragment layout is completely shown on the screen, this ImageView should be a fixed location in this layout.
Does anybody know how I can make this work?
Thanks!
I think I know what you mean. It might be easier to make it a separate View on top of the pager, perhaps disabled so drags will go through it. and then you need to get a live reading of the position of the page. onPageScrolled on ViewPager.OnPageChangeListener is pretty cool and gives you what you need to place elements or do other transitionary effects based on the actual position of the Views in your ViewPager.
I am trying to put a view horizontally on the right side of the tabs. If i put a view next to tabs, the activity displayed in tabs does not cover the region which is outside tabs thus it leaves a gap for that view. Does anyone know how to fix this.
Temporarily, I am using views instead of Tabs which made my layout very complex.
I have to show two tabs each containing ListFragment classes. On clicking any item of the list, it's details should open on the right panel on landscape views. This is much like the official Android fragments example.
What I want to achieve is that on the left side of the layout the list view should be in tabs, i.e. two list views within tabs. On clicking any item the details should open on the right. Till now, I can show tabs and details, but the details are not showing up on the right. They open as a new activity.
Tab Navigation can be an option, but due to some design restraints in my app, I can't use that. Please guide.
Please check this android blog http://android-developers.blogspot.com/2011/02/android-30-fragments-api.html It has a complete tutorial of how to use fragments as a Master-Details View.
I came to a solution. I am explaining how I did it, in case someone needs it.
I wanted to make tabs on the left fragment. Due to design constraints, I could not use Tab Navigation, as I had to use List Navigation too.
So, I made a new fragment placed over the left fragment and inflated it with two buttons. On different button clicks, I used FragmentTransaction to add new fragment to the left fragment.
On button click listener I used fragmentTransaction.replace method.
Is there some way to show a small portion of the adjacent fragments while using the ViewPager in Android compatibility package.
The view that I want to make will show the current fragment in center and the edges of the fragments which are before and after the current one on either side.
I believe a ViewPager indicator would be the best solution available. Showing that there are pages to either side.
http://androidforums.com/application-announcements/391561-android-viewpager-indicator.html