I am creating a script that explore different android applications. If the script finds a scrollable component during the exploration this one must be scrolled. The problem is that sometimes the scroll direction can be horizontal or vertical and I would like to know it before perform the scrolling action.
Given an AccessibilityNodeInfo of a scrollable component (e. g. RecyclerView), is it possible to know in which directions the RecyclerView is scrollable (vertical or horizontal)?
The presence of ACTION_SCROLL_UP/DOWN/LEFT/RIGHT is the API that gives you this information. Unfortunately, the original API of ACTION_SCROLL_FORWARD/BACKWARD is very common and doesn't tell you which direction. So, like pretty much everything in the accessibility API, it depends on the app and widget sharing the information with you.
Related
What is the easiest way to implement a screen slide in Nativescript like shown in Android Viewpager , but in a vertical direction ? Another example of this functionality would be the rss reader feedly where you can change rss feeds by swiping up/down.
The page should allow vertical scrolling to the top/bottom and then transition after a certain treshold.
I already encountered nativescript-slides, which can only do horizontally sliding.
So is there a "nativescript" way or do i have to implement it as native android/ios feature (for example by this) ? In either case a sample on how to integrate it in nativescript would be great.
Update
Recorded an example:
taken from this Repo with Android native code. The outstanding PR made changes to offer vertical scrolling in the list. But the repo seems to be outdated and a bit buggy.
I can provide more info later but there's a new plugin implementing the native controls for android and iOS for slides/carousel her https://github.com/alexrainman/nativescript-carousel-view and vertical swiping is on his radar, I think he might even be close to completing that.
To give an answer for anybody interested in above nested scrolling animation:
For Android I had to implement the native ReyclerView in Nativescript in favor of the NS buildin ListView. It is an optimized view structure which among other things allows nested (vertical) scrolling and can be used as replacement for an ordinary list.
Together with https://github.com/alexrainman/nativescript-carousel-view works like a charm!
Anyone that ends up here still looking for ways to achieve this.
I spent a lot of time trying to figure out a way to achieve this and tried to find ready plugins for this. Also tried to use the plugin from Alexrainman but eventually gave up since the plugin was not up to date with the current nativescript-version.
My solution:
I used radListView as a basis for this implementation and leveraged the methods and events on the radListView.
By using scrolled-event I gathered data for the use of the scrolling feature: scroll Speed and scroll direction. (These might be also taken from the event data, but since I did not find the event details from the Nativescript-documentation I gave up trying to guess where to find this data on the event-model).
Then I also saved the fixed height of one item on my list (The height I fixed to screenHeight-200).
With all this info, I managed to hook the event "ScrollDragEnded" and add logic that makes my list behave like a vertical slider. Moving on the list by method "scrollToIndex" and figuring out which index to scroll and when by leveraging all the data mentioned above.
This is the way I managed to make a pretty good vertical slide.
Good luck!
I'm looking for a way to scroll my horizontal menu at a specific interval.
I have multiple children visible on screen
The selected state is at center.
The use of snapToInterval in combination with snapToAlignement fills exactly my needs, but these props are only for iOS.
Is there a way to achieve this ? I suppose the PanResponder API could be use but I have no clue how to implement it.
I use 0.28 RN version. Thanks.
<ScrollView
decelerationRate={0}
horizontal
snapToAlignment="center"
snapToInterval={150}
>
{this.props.children}
</ScrollView>
There is a pull request regarding this issue: https://github.com/facebook/react-native/pull/15297
Also there is a library https://github.com/machadogj/react-native-carousel-control?files=1 that support for both Android and iOS swipe, it control the scrolling behaviour itself, but I tried it, it worked, but not that smooth compared with snapToInterval and snapToAlignment.
Another one, but more complex carousel swipe is here: https://github.com/archriss/react-native-snap-carousel
Hopefully, you will get more insights based on these.
Using Android 4.2.2
I'm trying to write an AccessibilityService, and have most of the required features. I'm drawing on an overlay and allowing the user to select/cligk highlighted items via a bluetooth switch (the purpose is a disabled client wanting to interact with an android device using only one switch).
Whilst parsing a screen, I can get the root accessibiltyNodeInfo object, and all its children. I can highlight on the screen all such elements, and click a desired one by the .performAction() method.
On the home screen, there are 3 "panes" available, with the middle one being shown. Swipe left or right to see the others (standard launcher behaviour). There is a node that reports isScrollable = true, but the Action Flags do not report ACTION_SCROLL_FORWARD or ACTION_SCROLL_BACKWARDS. How do I scroll such a node, if I cannot call .performAction() on it as it does not support scrolling? Why does it report isScrollable = true if its not somehow scrollable?
Any help appreciated - thanks.
You cannot scroll a node that cannot perform ACTION_SCROLL_FORWARD or ACTION_SCROLL_BACKWARDS.
The Accessibility framework on Android is experimental at best and is plagued with inconsistencies such as the one you mentioned. In general, it is best not to rely on any of the is[Property]() methods. Instead, you should test for the property you are interested in yourself, after calling getActions() or getActionsList() on the node.
I'd like to make a view in my Android app that flips between multiple views on a swipe/fling. I'd like it to behave more or less like the Android Launcher behaves when flipping between views. In particular,
It should flip views on swipe.
Generally a swipe will flip between one view and the next. It should not fling across all of the views.
If you swipe slowly, you should see the views dragging as you're swiping, eg. the way the Launcher does it.
I tried using a ViewFlipper with a GestureOverlayView as per Romain Guy's blog post here, but there's no indicator to the user as they're swiping. This makes discoverability difficult, which is presumably why Launcher does it the way they do.
I tried using a Gallery object, but when I swipe from left to right, there's a certain amount of momentum that flings the users through all the views rather than just taking them to the next view.
Is there a good way to accomplish what I'm trying to do?
I know this is an old question but ViewPager is created for this exact same purpose. ViewPager is part of android compatibility package and more can be found at http://android-developers.blogspot.com/2011/08/horizontal-view-swiping-with-viewpager.html
Take a look at HorizontalPager. It's actually based on RealViewSwitcher, which in turn is based on the Android homescreen's code, and supports snap-to paging with drag feedback, as well as nested vertically-scrolling subviews. Gesture support for fast swipes isn't all it should be, but this may get you part of the way there (and I'd welcome contributions back).
EDIT: As of 2012 you're much better off using Google's ViewPager - it's in the compat library.
Check out SwipeView within this project https://github.com/fry15/uk.co.jasonfry.android.tools It does exactly what you want it to do and is super simple to implement.
#CommonsGuy extended ViewFlipper to do it.
https://github.com/commonsguy/cwac-viewswiper
Ihaven't used this one yet so im not sure if it moves with your finger like the launcher if not your going to have to make an OnTochListener to do it for you in me.ACTION_MOVE you will update the view to change its position. I'll post some sample code when I get home if you don't get another answer.
As far as I have read in the Internet and official documentation, it isn't possible to make a scrollable app widget. Also all my tries failed. I even tried to subclass TextView to implement my own scroll method, but nothing worked.
Are there any ways to achieve that?
Btw.... there are solutions if you use for example htc sense or home desktop ++, but i want to make it available to other users which don't use this
Are there any ways to achieve that?
Not directly. You can always add buttons to rotate you through various options. But true scrolling is not possible.
HTC provides scrollable app widgets because these are built-in. Only their Launcher can create and display them. Regular app widgets do not support scrolling.
As far as I have observed, app widgets are scrollable, but only in the vertical direction.
For Eg. The calendar widget is a scrollable widget which comes with mostly all android phones.
Only the vertical scrolling is allowed for the fact that horizontal scrollings are required to change the screens in the home page.
It is said only 2 gestures are allowed for a widget,
1.Touch
2.Vertical scrolling.
Source : Developer's Page
Now you can make a scrollable widget, but you'll have the problems with images within it. Workaround is described here.