I am trying to create 2d scrollview which can scroll in any direction and i have found the library for that.
But now i want to animate the items which are inside that view, like when any item is going outside then start shrinking (when going outside from any direction) and when coming inside the screen then animate to original size.
Thanks
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What I want to achieve: I want to have a view inside a scrollable layout (Recyclerview with GridlayoutManager) with tiles (Views) in it. Dragging and dropping an item inside of the RecyclerView should adjust the position of the icon and swap with the other elements. When a drag starts, an icon above the RecyclerView will change to a trash icon and dragging the view to this icon will delete it from this RecyclerView.
I tried this excellent tutorial, but I didn't find a way how to handle dragging outside of the Recyclerview as the ItemTouchHelper.Callback uses only Recycler.ViewHolder elements as possible targets.
The method interpolateOutOfBoundsScroll() gives feedback if the view moves out of the boundaries, but will only give back the total size that is offscreen, but no coordinates. Also, trying to drag the view out of the Recyclerview always results in cutting of the View where it passes the borders of the Recyclerview.
Does anyone have an idea how I could achieve this effect?
You can achieve this simply by set this attribute for the parent of the RecyclerView:
android:clipChildren="false"
Edit: thank Adam Katz, I don't know why but sometimes you have to add this to the RecyclerView to make it work:
android:clipToPadding="false"
You are bound by the RecyclerView boundries. You have several options:
Make the RecyclerView's layout height to match_parent and to be on top of your upper view (is it a Toolbar?) and add a sticky header of the same size and have an empty transparent layout. That way you could drag ther and see the item floating over there.
Instead of dragging an item to a garbage can icon which is located too close to a legitemate upper-right item, make a long click to select the item (and apply a signal like a check mark or a red mask) and make the garbage can appear and delete uppon click (and maybe allow multi item deleting)
I'm trying to have a horizontal scroll view contain, for example, three vertical scroll views. And what I want is to be able to have the horizontal scroll view align to each vertical scroll view when you scroll over to it.
I'm not sure if a horizontal scroll view is the correct way to implement this kind of feature, however I found the method scrollTo(x,y) which I think may be in the right direction to creating this.
The best example of what I'm trying to do is shopping for music in the google play store (atleast, on my nexus 7). It allows you to scroll left or right, and it aligns to a screen's worth of content, which you can then vertically scroll.
So, that's what I'm trying to recreate in my app. But I'm confused on implementation details of allowing the horizontal scroll view, to scroll, and stop at a certain point. It looks like I need to override HorizontalScrollView to capture the motion events, but I feel like that's too complex for what seems like a simple task.
Does my question make sense? I basically am at the very starting point of creating this, and need some help as to where to go next.
I need a vertical ViewPager that has selected view always on center.
Something like Android's gallery widget works (selected element is always in center).
I have tried to implement vertical Gallery, but since it's deprecated...I would like to have this functionality via ViewPager.
Is there a way to manage that selected view is always on the center?
Also how to manage scroll amount of ViewPager?
For example...when I scroll trough the content I want to scroll for exactly one element's height.
Also I need mechanism how to define exact amouth of pixels for scrolling list view.
When list scroll I don't want it to only show next item, but to scroll for exact amount of pixels to always show the part of the following item.
Tnx for your help!
Im not sure if i understund the question. Isn't it as easy as this?
viewPager.setCurrentItem(viewager.getAdapter().getCount()/2)
About scrolling the pager to an specific amount of pixels,
You have to signal the ViewPager by calling beginFakeDrag() and endFakeDrag() on it. After starting a fake drag you can use fakeDragBy(float) to drag the ViewPager by the given amount of pixels
I want an expandable list in which I can drag a child item and drop it over some other parent list item which will result in child moving from one parent to other. I only need a direction how we can achieve this in general listview (let alone exapandable). Examples are available for picking up a listitem to change the order of listview i.e. to sort that list. How can I accomplish dropping over a view in order to group them.
Your best bet will be putting your effort on customizing and making your own listview, Consider extending AdapterView, this will give you more power over controlling child display and organizations, Putting animation such and drag and drop will be easier for you in this case, Otherwise with simple list view it might work but i doubt if it would generate the required result you want.
Here is a link for exending AdapterView and customizations, go through it it will give you enough confidance to put in your animation. I tried almost similar stuff and was succesfull by same way, unfortunately I dont have implemented code with me.
http://developer.sonymobile.com/2010/05/20/android-tutorial-making-your-own-3d-list-part-1/
Else with list view try doing following,
Your listview should be wrapped inside a framelayout, you will need layers
Enable drawing cache for childrens, coz animation you seek requires playing with bitmaps
Second, when you touch a child in listview, get the bitmap of child, and inflate it at same coordinates of touched child, you can get position of Child easily.
Now time for some animation, you enable drag and drop over inflated bitmap, now when you move it, first thing you need to do is, shifting all the childrens in list view either Up or Down depending upon movement of finger, you can define somekind of threshold like unless half the height of children is moved you wont shift childs in listview up or down.
Moving child will be easy, all you need to do is applying Transformation animation to all the currently visible child in listview, use childCount and ChildAt api for the same, and animation set for playing them together.
Thats it when you build space by shifting child, user will feel like drag drop and shift, all the thing you need, when user places it a place, just modify your dataset underneath listview reposition it based on recent changes by user and refresh it,so that listview reorders itself.
I have a ListView in my Android application. The individual views in the list are a little bit smaller than the size of the screen.
I want the list to always show one item centered in the screen, with just a small sliver of the previous and next items showing above and below it.
When the user scrolls, I need to reposition the child view at position 0 or 1 (depending on which way they are scrolling). Currently I am doing this by calling "setSelectionFromTop" in my onScrollStateChanged method. This works, but the transition is immediate, not smooth. It is jarring and confusing in a lot of cases.
What's the best approach to fixing this? I want to animate the process of scrolling the list into the position I want, but I can't find any methods in ListView or its superclasses that let me directly control the scroll position of the entire list.
I think I could animate it using multiple calls to setSelectionFromTop(int position, int y) with progressive values of y, but I don't know how to determine the initial value of y. Is there some way to get that by interrogating the view object at the designated position?
Another challenge I have in front of me is that I want to animate the removal of an item from the list - by having it either disappear or slide away to the left, and then having the surrounding views move up and down to fill the space. Is there a straightforward and reliable way to do this with a ListView? Should I just give up on the ListView and write the whole thing as a custom view from scratch?
Thanks.
This definitely should be possible. Does smoothScrollToPosition() work?
Otherwise, you can try simulating the touches using TouchUtils.