i have two listViews,one from an rss feed and one with data from my database (using cursor).
is that possible to create a button and just change the content of my listview?
i mean,when the user first get in my app,the listView should present the articles from rss feed,and when the user press the favorite button,the list will update with the favorite articles (from the database).
You're probably looking for one way to filter your list view, since clearing the whole list view and adding data from the cursor ain't an efficient solution, For filtering a list view you can customize your own listview's filter:
Check these posts:
1
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Of course it is possible.
You need to display the button in your layout, and create a click handler to that button. The click handler should either replace the entire Fragment, the ListView, or simply replace the data in the ListView. Generally I would recommend replacing the Fragment.
You can follow this guide on how to handle input events and creating click handlers:
http://developer.android.com/guide/topics/ui/ui-events.html
To replace a ListView:
ViewGroup containerOfListView = (ViewGroup)findViewById(R.id.parent);
containerOfListView.removeAllViews();
containerOfListView.addView(newListView);
Related
I'm new to Android and can't quite figure out the right approach for the problem I'm trying to solve. I have an ExpandableListView with several items. Each item has an EditText, except the last item has a button. The contents of the EditTexts are to be loaded from the database. When the button is clicked or when the activity is navigated away from, I want to save the contents of each EditText to my database.
I'm not sure what to call from the activity's class, what to call from my adapter, and how exactly to access each item appropriately. Code is welcome but not necessary, I'm just looking for guidance on the general approach. Thanks.
I'd recommend putting a method in your adapter called saveAllValues. It iterates through the list of objects in the adapter and saves them to the database. Call this when your button is clicked and in your activity's onStop() method (which is called when the activity is no longer visible).
You should have your activity fetch the values for the item IDs in an AsyncTask in its onCreate method. Then pass the list of id/value pairs to the adapter in its constructor. It should maintain this list so it can go back through it and save the IDs and values to the DB.
Hope my answers in these links help:
Values of counter changes after scrolling ExpendableListView shows how to maintain the list inside the adapter and how to get list from the activity.
Remove the divider view in the expandablelistview last item shows how to make the last child different from the others.
I'm building an android app and I'm trying to replace a list view with another list view if you click a button, like the notifications page on Instagram. On that page, if you click on the top "following" button it will show you a listview of what your followers have liked. If you click on the "you" button it will show you a listview of what people have liked your photos.
Any help would be greatly appreciated!
You can do it by following ways,
1. add Two listviews and can change the visibility as per your requirement.
2. On button click you can load the other data into same list view and can update your adapter in the same list view.
in 1 you have to load two list view at first which will consume more time if data is larger sure you can write a login in asynctask to load list views in background thread.
in 2 you have to update your adapter at the button so you will have to provide some progress bar of dialog for user while you list view is getting update.
You can use either of this whichever suites you best.
Simply , You don't need to switch Listview , you only need to switch adapters .
eg, you can switch to mFollowingAdapter when clicked on Following button and switch to mYouAdapter when you select "You" tab. that's it.
You should write a list, that has a custom adapter. This adapter will be able to display BOTH views you want to display.
If the data to be displayed is the same format (ie. both have an imageview next to a textview), you are in good shape.
When you want to switch to a different list, get the information you would like to display, replace the data in your the collection backing your list, then notify the list that the data has changed, and it should redraw.
So, this might look like:
create ArrayList() with data A
setup List, with this data and display
replace the ArrayList() with data B
call listView.notifyDataSetChanged
You can still do this if the Data A, and Data B have different views, in this case, you would need to handle this logic in your custom adapter.
I am working on a UI where I have a list view. Each row has 2 information. One is Product name and the other is product ID stacked one over other. So each row has 2 lines of data.
What i want to do with this:
Once a user clicks on each row, it will further expand and show one input and one spinner. So it is basically for putting in Quantity and unit of measure.
Please let me know if this is achievable and if I can refer to some example.
What I need is more like
Taskos To Do List | Task List
https://play.google.com/store/apps/details?id=com.taskos&hl=en
All i need is that the category will not be expandable. Only the items will be expandable. All i need is an example of such app and then I can take it forward.
I think it could be done... you would need to put the extra widgets in your row layout, populate them and hide them upon list creation, then in your onListItemCLick you could unhide them.
Note I have no idea if this would work, but it seems reasonable that it might and it's what I would try and do to achieve the goal.
listView cannot be expanded. however you can use an expandablelistView
But the kind of functionality you want cannot be done this way(I guess.).
You can use
registerForContextMenu("your list View");
to register your list view
onCreateContextMenu
for the kind of action you want to be performed in your case its dialog with EditText and Spinner to have input from user
I have an activity on the top of it there are some buttons from which when a button pressed it loads the dialog with country list and when user choose choose the country it will load the channel list below buttons.
so when activity start it shows blank screen until user choose the country
so i want to show a list when activity will start and then same procedure will follow as above.
but how can i load two different listview?
i tried
acivity start
load the default country channel's list
buttonclick listener
perform click {
load the another list
}
using the base adapter class found here.
Just switch adapter to current list (this is the easy way to do it)
OR
In your android xml file, where you create your activity, create two listviews with different ids. First listView will have android:visibility="visible" (this one will be shown first) and the second one will have android:visibility="gone"(you will make this visible when you perform the click).
When you want to switch the lists, just set first listview visibility to View.VISIBLE and the other one to View.GONE, from code.
Don't forget to switch adapters for different lists (this may be a bug source)
I would do following
Have a flag like isCountrySelected
Change your adapter and onitemclick handler so that according to isCountrySelected, you either load channel list or country list.
How can I create a list of items that allows users to click each individual item. For example,
Apple
Banana
Pineapple
User can click any one of these and then I will query a website and deliver more specific information about the clicked fruit. Is it possible to do without creating another view or action, i.e. just changing the information using setText() with checkedtextview?
ListView or ListActivity with an onItemClickListener(), and an another Activity for showing the details.