I have searched everywhere for an answer to the problem below without success.
I understand that there are two ways of visually connecting fragments during navigation: namely animations and transitions.
I have understood and used animations to connect two fragments but now I want to use the set transitions, not animations.
Here is the problem: I have two fragments, when the current fragment is replaced I want the second one to slide in - I suspect that using a built-in transition is simpler than an animation.
I get stuck at this point in the android developer's guide - only a code snippets are shown - what would the full xml resource file look like ?
All insights welcome
Solved. Just required a calm and close re-study of the Android Developer's guide on the 'Transitions Framework' and also The classes Fragment, Transition, TransitionManager, Fade, Slide.
My initial panic was caused by Android Studio opening a new xml file from the transition directory with an auto-template that began with the root tag <transitionManager> but files in the res/transition directory can begin with roots <transitionManager>,<transitionSet>, <transition> or simply the name of one of the built-in transitions such as <slide> with the parameters of the slide as attributes.
Related
I've an application that uses Fragmnent Views with XML resources and I want to migrate it to Compose. Being the app quite big, I decided to temporarily have a mixed environment with Compose working together with the old XML resources, so I created a new Compose fragment and I succeeded to add the standard navigation action to navigate to it. The code builds successfully, but when I try to run the app I get the error of the picture below. It is particularly wierd because this error appears immediately, and not in the build panel, but in a popup dialog. Any hint ?
Ok, the documentation is not very clear, but in the end I found this:
"You can also include a ComposeView directly in a fragment if your full screen is built with Compose, which lets you avoid using an XML layout file entirely."
Being my app a hybrid one with XML navigation graphs, it looks like I need to define an XML resource anyway.
I hoped I cound avoid defining an XML layout, but it seems I need one for a fragment that has an old fashioned Activity as parent.
I'll post an update as soon as I discover something new
UPDATE
Adding an XML layout didn't fix the problem.
In fact the XML layout is not necessary. I don't really understand the cause of that error, but after cleaning a couple of times the project and clearing A.S. cache it disappeared. I succeeded to add a Compose Fragment to an old XML resources style app. The old navigation works without problems. Hope this post will help someone else save the time I have wasted...
I m new to Android development and stuck with design. I d like to design a single activity application with multiple fragments. But whatever I consider, I m stuck with design.
I first considered fragments as components or widgets that I could organize where I wanted on my screen. But a single activity has only one xml view layout and can not find a solution.
Here is what I want.
UI design
The problems are the following.
The layout choice: I need a layout for full screen fragment screen 1 but another splitted one for other screens.
The keyboard: if I do a fullscreen fragment layout for all my screens with a (game-keyboard) fragment and (dico-keyboard) fragment, how do I remove the keyboard in dico fragment on tablets ? And can I share keyboard code between both fragments ?
I saw that calling setContentView during runtime is kinda annoying as you have to reassign your variables and is not suitable.
All the applications I find are fullscreen single fragment on layout allowing libs like ViewPager. I can not find an example of composed screen with fragment components.
What layout would you chose, with what kind of fragments ?
Or do you know a library that allow composing fragments as widgets on screen ?
Thanks for your help.
Welcome to Android. Buckle up, it's going to be a bumpy ride.
First, you should spend some quality time with the Android Developer Guides.
Developer Guides | Android Developers
The insight for your particular challenge is that layouts are resources, and and you can have a layout resource that changes based on the configuration.
So for example, you could have a resource like layout_main with one XML file for small devices and a different XML file for large devices.
App resources overview | Android Developers
Create alternate layouts | Support different screen sizes | Android Developers
You can arrange fragments on a layout using the Android Studio layout designer.
You can add Fragments and navigate.
First of all yu need a navigation: In the left hand side on Android Studio you can find the Resource Manager Then click to Navigation then click to + and choose the Navigation resource file
After this you can add fragment to the navigation:
New Destination (green +) (Don't forget to give name to your fragments).
After this you can add the navigation to your activity's xml. You should use the app:menu=”#menu/bottom_nav_menu” code in your xml
Here a video about the process:
https://www.youtube.com/watch?v=Chso6xrJ6aU
So in my nav_graph.xml file, I have a lot of fragments. It took quite a while for me to drag them around in the Design view, and I want to make sure that is backed up. I'd like to track that in my git repository, but I have no idea where that information is stored.
I'm assuming it is in a file somewhere. Does anyone know where that file lives and what the name of it is?
EDIT
To be clear: I am not looking for the xml file itself. I know where that is. It's over 800 lines long, so if I didn't know where that was, it would be magic that I even had a nav graph at all.
I'm looking for the file (or wherever the information is stored) that controls how it is laid out visually in the designer. That the view where you can drag the fragment tiles around to present the graph visually.
For example, this from the Android docs:
What if the green tile was dragged above the pink/orange tile? Something has to save those coordinates, right? Or it wouldn't load again the next time I started Android Studio. Where is that information saved??
nav_graph itself saves all the information, related to the fragment directions and actions, which actually defines all the required information for working of the Navigation graph.
I'm looking for the file (or wherever the information is stored) that controls how it is laid out visually in the designer.
Information regarding the visual representation of the nav graph is editor specific, and Android Studio stores it in .idea > navEditor.xml.
To access .idea directory, you've to be in project mode.
The information is stored in nav_graph.xml itself. For designing layouts, menus and working with Nav graphs, Android Studio provides the functionality of either writing it as a code or design it, while the code will be written internally by the IDE.
In the above picture, you have been using Design tab to place the fragments, while on the other hand, you can check the Code tab, where it is written in plain XML
app > res > navigation > your_nav.xml
I am learning Android Studio and I have recently come across listview.
I am making a project which has 6 buttons and each of those 6 buttons will open an activity where there are 2 additional buttons and if you click on 1 of those 2 activities you will reach the required page.The required pages have different text content.
I am approaching this problem by creating a new xml file for every activity however this leads to creation of many pages and I just wanted to know if there is any method which will reduce the number of files created for this project
If your two activity have similar look than you can use same layout,
else you have to create different layouts for all your activity.
If you have Activities that looks alike you can use the same layout file for both activities, and only change the behavior in the Java side.
And if you have activities thats acts alike you can also use the same activity and change the behavior depending on some extras.
We can create animations using both android.animation package and android.transition package but I would like to know what is the main difference between these packages since even custom transitions also use animator's from android animation package.
From the documentation of android.animation:
These classes provide functionality for the property animation system,
which allows you to animate object properties of any type.
From the documentation of android.transition:
The classes in this package enable "scenes & transitions" functionality for view hiearchies.
From there a conclusion could be made that android.animation mostly handles individual View animation (a FAB moving left upon click, etc) while android.transition cares mostly about view hierarchy/layout transition animation (Material Design shared elements, etc).
do read about fundamental difference at http://developer.android.com/about/versions/android-4.4.html in 'Animation & Graphics' section. Basically, you can transition between different states of UI by defining Scene objects.
I don't have any code to support as i haven't used this till now, but above link should get you started.