I want to create a expandablelistview that has more than two levels ,and the data is from the database, which has the id,name,parentid , but the default layout of the expandablelistview component is two levels , so how could i do
You cannot do it using the Expandalble List built in in Android.
You would have to write an adapter of your own. People have done it. I've seen several implementations of file browsers that have multi-layer expandable lists. Some might even have the code available so you could take a peek and see how it was done if you can't figure out how to do it yourself.
EDIT
Found some code. One of these should do the trick for you.
tree-view-list-android extends baseadapter
SO Answer with link to code for using a modified BaseExpandableListViewAdapter.
Related
I've noticed that the new RecyclerView class, even though it makes things a bit cleaner, is lacking a lot of functionality that I'm familiar with:
dividers, but this can be solved by looking at this post or this one
"footerDividersEnabled"
"headerDividersEnabled"
"listSelector" , but maybe I should simply set it per view ?
"fastScrollEnabled"
"smoothScrollbar"
"textFilterEnabled"
I've also tried to find out if there is a new way to use the new class with filtering (as done with ListView by implementing Filterable). I couldn't find out if there is such a thing
"tools:listitem" , to show the items on the UI designer.
Those are what I use, but maybe there are others that I missed.
Is there any tutorial or some guidelines of how to replace each of those things?
ok, I think I've found some solutions to what I wrote about:
dividers - the links I've given can probably help (here, here and here).
"footerDividersEnabled" - probably like #1, but even if you don't have it, you could always add a divider to the layout of the footer.
"headerDividersEnabled" - same as #2.
"listSelector" - should be done to the item views .
"fastScrollEnabled" - no solution is available for this, except for this library I've found, which was an answer for my post here.
"smoothScrollbar" - should be a feature request for #5. I think it's already smooth, but I'm not sure.
"textFilterEnabled" - sadly, you need to handle it yourself. create a thread pool of size 1, or manage your own thread (or use AsyncTask, in case the work is relatively short), and let it do the filtering for you.
Filterable - same as #7
"tools:listitem" - not available, but I think you could extend from RecyclerView and add it. You will however have to put some work, as RecyclerView doesn't know how to layout the views.
No tutorials that I know of, but the sources for ListView are public! There's no better way to learn than this... For example: I recently implemented filtering just like ListView does and it work like a charm. Plus, if you do it well, you only need to do it once and can re-apply it everywhere!
I would recommend you go look at some of the library's for the RecyclerView. You can find a lot of library's at https://android-arsenal.com/.
Also you can implement your own functionality in the RecyclerView and the Adapter for the RecyclerView. Just extend the RecyclerView and build on that.
I recommend that you read the source code for the RecyclerView at https://android.googlesource.com/platform/frameworks/support/+/refs/heads/master/v7/recyclerview/src/android/support/v7/widget/RecyclerView.java.
I have to make a custom list view with custom header, ( different text in each headers) and different number of items below each header. I have been going through various section indexing examples but I think they are not relevant much to my answer.
Anybody please suggest me a good means to move around such type of list view in android.
This might be a duplicate of Android Listview with sections
There are lots of different ones out there. One example is: http://w2davids.wordpress.com/android-sectioned-headers-in-listviews which uses: http://jsharkey.org/blog/2008/08/18/separating-lists-with-headers-in-android-09
That one allows you to pass in different array adapters for each section so that you can have different layouts for each section's items.
If you were more clear about what the ones you have seen fail to do that you need it would be easier to offer you something you haven't seen.
There has been lot of thread exists on the Stackoverflow, check:
Android Listview with sections
Android ListView section header
How to draw a section header in Android listview just like the Contacts app did ？
But I am not sure these threads has helpful info, but if you want to read, understand and implement ListView with sections then here is one of the great and detailed article given by Cyril: ListView Tips & Tricks #2: Sectioning Your ListView
For a more complex design with sections in list, you should try this very standard library : https://github.com/emilsjolander/StickyListHeaders.
Other alternatives mentionned are great.
I should mention that the only drawback of this library is a poor mavenization and its absence on central.
Try this tutorial..its very nice and simple
http://www.androidhive.info/2013/07/android-expandable-list-view-tutorial/
There's a very good library for this. I've used in a project or 2 myself. Check it out:
https://code.google.com/p/android-amazing-listview/
Why can't you use expandable list view?
this link might help you: Android Exandable listview tutorial
I'm building an App for Android that already exists for iOS. On iOS, we really like to use the listview grouped style to show details and forms. It is really useful to show details of objects that we don't know how much properties they have before loading it.
I know that Android doesn't have a similar tableview style. And I don't want to use a custom library to recreate it, because I don't want to force an iOS like interface to my Android's users.
But how would you create a consistent Android interface that show similar information? Do you have example for me?
First of all, your instinct to not force iOS style UI onto Android users is correct and I respect you for it.
Android's ListView is roughly the equivalent of iOS's UITableView. There are important differences. For instance, you should never use a ListView inside another scrollable container. If a ListView is in a particular layout, it should (usually) be the only scrollable component. If you want multiple ListViews in a layout, you probably don't want ListViews at all. You should instead use (vertical) LinearLayouts and add the items in order.
Cyril Mottier writes excellent posts on implementing custom behavior for Android's ListView.
If you want to display data in a list then you can use the ListView. Here is a great article about how to use it.
As a goal for my first Android application to learn the Android SDK, I am trying to create a simple RSS viewer for a specific url. Disregarding the networking side of the goal, I am having trouble with getting a listView to display a custom layout.
What I'd like to do is have each row of a list view show one of two images(read or unread), followed by some text. I'm not really having a problem, it's more that there aren't any examples that I could find (I might be looking in the wrong place) that covered custom layouts depending on conditions in code.
Any help?
Here is a free excerpt from one of my books that discusses the techniques involved. In a nutshell, you will need to extend your Adapter class (e.g., ArrayAdapter, CursorAdapter) and take direct control over the creation of rows, so you can apply your desired business logic.
There are no controls in Android that provide Tree-like View. There is an ExpandableList View which I suspect could be used to creating one.
Have you tried imlpementing such a control?
How would one implement such a control in Android?
Our company just open-sourced a small widget that is doing just that... You can see all the sources and add the project (as a library) to your own android project:
http://code.google.com/p/tree-view-list-android/
take a look at ExpandableListView. Besides, see following thread:
http://www.mail-archive.com/android-beginners#googlegroups.com/msg03587.html
this solutions are, very complicate. but can use a ExpandableListView of more levels.
Example: How to implement multilevel ExpandableListview in Android?