I have a menu that is made up of a HorizontalScrollView that has a LinearLayout with TextViews. When a user swipes/scrolls I want to be able to show and not show a leading and trailing image that represents that there are more options. So, when the application starts, the far left image is not shown but the far right image is. Once the user swipes to go right, the far left image is shown. When you get to the very last option to the right, the right image is gone.
I have tried to use the SimpleOnGestureListener but it seems that the position reported is where the user is instead of the position of the list. I was thinking I could just do something like:
if(scrollX < 200.0) {
tempL.setVisibility(View.INVISIBLE);
} else tempL.setVisibility(View.VISIBLE);
I even implemented both onFling and onScroll methods to try but did not get the expected results. Also, the position is only reported when the user scrolls again. So, a fling position may be 1278 and go all the way to 0 but 0 is not reported until the user tries to fling again.
Thanks.
You can use gallery for this. It has some limitations though, but I guess it would suit your requirement better than a horizontal Scroll View.
Related
I want to be able to scroll a RecyclerView behind a keyboard. The issue is that if I have say more than 5 items in the RecyclerView.Adapter, and assume that each item might have a height of say 100dp. I want to be able to scroll the RecyclerView down with the keyboard still up and be able to scroll down to be able to see the first item in the RecyclerView.
In iOS you can set something called a contentInset on a NSTableView and that gives you extra scrolling space below the list. I am looking for something similar for the RecyclerView so far, there isn't much to go on.
INITIAL STARTING POINT
WHAT HAPPENS (Can't scroll down anymore)
WHAT I WANT (be able to scroll down)
I need to create listview which should displays as a photo slider. I mean that it have to be only one item at the screen. And when user starts swiping up or down item above or below become be visible, but doesn't fill the screen. And when user swipes it at some defined point, this item fulfills the screen. And so forth.
As a photo slider. You open it and see only one photo at the screen. Then you click on the photo and start swipe down. Accordingly to your swiping photo which is in bottom of current fulfills the screen. I want to implement such a principle at my listview items.
I attached the files which can describe what I want to implement. So position 1 - start position of the listview. Then user touches the screen and start to swipe left. You can see that on the 2-nd picture - user sees the item 1 yet, but also see 2-nd item. And, finally, when he swipe over 2-nd item to the end, he sees only it on the screen. I'm sorry for such strange explanation, but I think that it can make my question more clearly.
Besides, I want to implement vertical swiping, not horizontal at my listview and it should be only one item on it.
I am still not sure if I got you, but from what I could gather? Are you looking for a View Pager? If yes, then a nice tutorial is given at this link. View Pager is used in the home page of the google play app. Try opening it and slide right left top bottom and see if thats what you want? Also, from the images it seems as if the headers have been added to the View Pager, that can easily be added by using view pager indicator. I hope i was of some help to you. If you have some doubt please feel free to ask.
I have searched a lot but I couldn't find an answer.
I want to implement something like in Go Launcher. When you drag an icon in app drawer and move it out of container top or bottom bound, the list begins to scroll.
So far, I have tried following things:
Dispatch touch events to simulate scrolling - impossible while touching the screen
Use smoothScrollBy() method - almost there, but it scrolls only screen height distance
Use scrollBy() - it moves only the container and leaves blank space. I would put there some rows if only I could be able to reuse views that went off the screen.
I need the ListView to scroll SMOOTHLY.
So here goes ma question. Anybody knows how can it be done? I'll put a gratitude in About section of my app to person who will help me:)
using listview and try scrollToPosition（），or smoothscrollBy（）
I have a ScrollView which has two hidden images, one at the top and one at the bottom. In between there is a bunch of visible content.
What I need to do is make these images hidden by default but when you scroll all the way up or all the way down you could see them as you're scrolling. But then as soon as you stop scrolling it should bounce back to the visible area so that the hidden images aren't showing.
Basically I'm trying to imitate the bounce scrolling feature of the iphone UIScrollView.
I have my ScrollView all setup and I do a scroll at the beginning so as to hide the top hidden image. Now all I need to do is detect when a scrolling has ended, figure out the Y position, and check whether a hidden image is shown. If it is, I would just programmatically scroll the view back so that the hidden image is hidden.
I hope all that made sense.
So anyways, I know how to programmatically scroll a ScrollView. Now what I need is some sort of callback to tell me when a ScrollView ended scrolling and also a way to get the ScrollView's current 'Y' position. Are there any such methods I could use?
I looked through the ScrollView docs but nothing jumped out at me. I'm still not very familiar with the Android naming schemes so maybe I missed something obvious somewhere.
Anyways, any help would be appreciated here. Cheers.
You can use an OnTouchListener to detect when the user presses/releases the list.
You can also use the onScrollStateChanged method of the OnScrollListener class (most likely in conjunction with a touch listener) to detect changes in the SCROLL_STATE - when the list has stopped scrolling the state will change from a state that is not SCROLL_STATE_IDLE to SCROLL_STATE_IDLE.
Alternatively if you are using 2.3 or above you can use an OverScroller to get the desired effect (see Modifying Android OverScroll for how to change the over scroll effect to an iPhone like one).
The views are not cached in a ViewFlipper. Is there a way wherein we can get an image of the view and show it to user so that he sees the Ui as we see on Home scrren(when we swipe the previous view also moves along and when we lift our finger, only then the next view is shown completely.)
What I want to do is that when the user starts moving his finegr on screen, the view should also move along(create an image of view).
I am not getting to do this, as when we swipe the present view goes and next view comes, we do not get both visible when we r moving our finger on screen.
Please if anyone gets what I am trying to do, do help me.
Thanks,
Farha
It's tricky to get scroll and swipe tracking working on Android, while using ViewAnimator or its subclasses.
They allow you to set in and out animations and start them at a given moment, but they work with discrete, either-this-or-the-other-view animations. They are actually using FrameLayout and after in or out animation is executed, other views' visibility is set to View.GONE to hide them from showing up under/over your current View.
The Launcher and the Gallery application are actually doing the functionality you want, by using a different approach.
They track the user touch input (onTouchEvent()), on MotionEvent.ACTION_MOVE they perform animations manually and on MotionEvent.ACTION_UP snap to the appropriate view, just like in the iPhone.
Unfortunately, this approach is actually more complicated than it looks like.
With the manual handling, you have to ensure that you are taking care of everything related to the touch input. This includes a lot of flag-raising, value-checking, event-delegating, etc.
If you want to get better acquainted with this, take a look at these classes from Gallery3D or Launcher's source code.
One other way to get nice horizontal scrolling is to use HorizontalScrollView.
You have to figure out a way to recycle your views, like you would with a ListView and you have to add the snap-to-view logic, but if you have to take care of a small number of views it could be the easiest approach.
Hope that helps.