I cant seem to find smooth solution for next what one would thought would be simple task:
I am using ActionbarSherlock for my application with 2 tab bars. On first tabbar i have simple input form and on second i would like to show inputed data in ListView.
Widgets and views are not problem here.. the only problem i have is next:
I would like for my listiview to be updated when user scroll into it.
How can I make that happen? Until now I had walk around with TextSwitcher and static variable that executed refresh of ListView.
Thank you
Related
I am building android application where I am using Custom ViewPager. The Problem is explain below in the following steps:
When I open new activity of ViewPager and click on any button and setText any particular value to it. It's working fine.
Problem occurs when I swipe left-right and then click on button to setText on particular TextView; the value gets set as I can toast the value of TextView using getText. But the value does not change in the UI. For exmaple - I swipe any page and now the TextView contains my current position as 2. If I click button and try to do setText(position++) and toast the value, the incremented value is shown in the toast
But still TextView showing 2.
This issue is coming particular in 5.1.1.
I've also been fighting this one for several hours. Best I can determine ViewPager is really designed for a single view where nothing changes after the first time it appears (which hides the bug where SetView stops working). Think of it as showing fixed pages in a book.
If you have an adapter (in my case a CursorAdapter) in the Fragment, you can get it to update using a notifyDataSetChanged() on the adapter after an update is made. This still doesn't fix the setText being ignored after the first time the page is rendered.
Another solution may be to use Action Tabs with Activities instead of Fragments, but this has been depreciated. Still looking for a better solution.
I'm using Recyclerview to show a list. I want to delete some items like IOS. In my listview template I have added a button to delete item which is invisible by default. In my activity I have another button attached at bottom (Not part of listview) and on tap of this button I want to make all delete buttons of listview visible.
My Question is how can I get reference to all delete buttons of listview in activity and is it the right way to do this?
Thanks
Assuming you have ViewHolders set up, you already have references to all the buttons in your list. All you have to do is to make them visible for every item in the list with a simple loop.
In case you haven't implemented ViewHolders I suggest you check out the documentation and take a look at some simple tutorials on how to use them.
On a side note. If I understood correctly you're making a bottom tab for your app and since you referenced iOS I gotta say this; Remember that Android and iOS are two unique operating systems with their own ways of handling things. Check out Googles pure Android documentation.
In your question title you say RecyclerView, but in your text you say ListView. The solution is similar either way, but it's best to be perfectly clear what you're doing.
In either case, there are at least two different solutions.
First, you could use a boolean flag to determine if all the the item buttons should be showing or not. You check this flag at the time the item view is inflated or created and toggle the button accordingly. If the boolean flag is ever changed, the easiest thing to do is tell the RecyclerView/ListView that the underlying data has changed and to redraw all the views. Call notifyDatasetChanged on the adapter.
The other thing you can do at the time the item buttons should change is iterate all the visible item views, find the button, and change its visibility. With RecyclerView, you can do this, and with ListView you can do this.
I'm building my Android App using Viewpagers, and I built a ListView that takes 8 seconds to show the full Items.
The page doesn't update the view automatically, thats why the Listview appears empty when it is shown for the first time.
So, I was thinking about creating a new page called loading, and hide the page with the listview, and only show it when the Listview items are already there.
To do that, I would like to know how can I hide pages.
I tried to use an Handler and change the number of pages after 8 seconds, but it didn't work, can you guys give me any idea of how can I do that?
Thanks.
You shouldn't create a new page called loading,it is not a good way to solve it. You can u get data in oncreat first time,then update data by a timeror handler+timertask and so on.
How do I do pagination using ListView. For an example, I have 12 records in my ListView and I want to show first 10 data in 1st page and the remain data in next page.
You can add a footer on your listview that will hold the buttons for next and back. In an stackoverflow question you have the complete solution for that.
Next step can be done in several ways. The simplest one, that I am seeing right now, is: Save the page you are at a variable. Then, each time you do next you add one to that variable. In your adapter, in the getView you multiply that variable by the position so you can get the correspondent position depending on the page the user is.
Better way to build view like pages, use Fragment,You can show desire content in pages as you mention in your question, for more details look out section 21 example,it cover fragment.
I want to create a horizontal listview which contain many item, one item will contain a image. When user slide listview => the count of item will be fix when it display, example display only 3 or 4 image. How can I do that? Many thanks.
Edit:
I use this
to create a HorizontalList view, everything is ok but I don;t know how to make the Next and Previous button work! Any idea?
Instead of a horizontal ListView (which, as far as I know, isn't offered by the Android SDK) you can use a HorizontalScrollView. You can add the items like to any other kind of layout class.
It looks like what you are looking for is a Paginated Gallery. I have written one here.
Its still only a couple of days old but hopefully the included Activity code will get you off the ground.