Ive got some gridView and some function which is called when a message arrives from server. In this function I get the values from server and I want to write this value in specific item in the gridView.
The problem is I dont have any idea how can I rewrite text of som Item in the gridView and I couldn find any answer on the internet :/
First you need to to add the received data into arraylist which you used to populate your grid view . You can add the received data into any position of arraylist as you need.
Then update the Arrayadapter using the following command
adapter.notifyDataSetChanged();
I understand up to some point. In my expatiation i think your set by using adapter right. So the simple solution is once you get the new items for a grid. call the setadapter again. Then that will set the new items. Try it once.
Actually i have to comment out but i don't have that much points.
Related
I'd like to achieve the following behaviour:
When an spinner is touched it makes an http post that returns some results.
Until the results are received the spinner doesn't display showing its current results.
Once the results are received it finally displays showing the results.
I successfully manage to make the petition and getting the results problem is that it looks like when an spinner is touched it automatically displays. There seems to be no way of telling it: "I have now touched you, stop there, and when response is received then show the results that you have received."
Is there any way to do this?
Since every time user touch spinner you made a request, what you could do is , as user touch spinner , clear the values in adapter.
//Here is a list of options to use in spinner.
List<String> options;
ArrayAdapter<String> adapter = new ArrayAdapter<>(context , R.layout.simple_spinner_items , options);
as user touch the spinner clear adapter items or if you using custom Adapter implement clear functionality or if the custom adapter inherits ArrayAdapter then no need to implement clear functionality ,its already there.
adapter.clear();
once you received the data which is List of String (I'm assuming)
adapter.addAll(options);
I'm trying to build an app of my website(Just new to programming Java), getting data from my site is all going fine, but now i need to display it. I did some research online for the best way to do it(CustomListView), but coundnt find the solution yet, hope you guys can help me out.
The site i'm making an app of, is just a site where people can post text, or text with a photo.
Getting the text in my listview is going fine, but i also need images to display.
The problem is, how can i tell the Listview that it only contains text, so it wont display any image field, and how can i tell the ListView when there is a photo found by the post,that it also should display that one?
You can use a tag if the post contains an image or not for example if the data is in JSON form just set a tag
[{contains_image:"null"},{contains_image:"yes"}]
Then in your adapter check this tag if the result is a null set visibility gone
You have to create a layout containing a listView.
You have to create an xml lyout corresponding to one row of your list view.
You have to create an adapter which will populate data to insert in your listView
You have to create an onClickListener on your button to add data in your list
If you are using an ArrayAdapter or a CursorAdapter, add the new item you created to the list or the cursor used by your adapter and (notifyDataSetChanged() is automatically called), so your adapter will update the listview
Source : http://developer.android.com/resources/tutorials/views/hello-listview.html
Have at look at this article : http://www.androidhive.info/2014/07/android-custom-listview-with-image-and-text-using-volley/
Once you are go through with above set placeholder image which will be show for the items that do no get dynamic images from your server response.
I have endless scrolling implemented on receyclerview and it's working fine. After I reach last item, across internet connection I get the data from second webiste page and populate the adapter and displayed data inside the app. But the problem is after download of new data is finished I'm always returned on first item, so I have to scroll down to see last downloaded items. I tried with notifyItemInserted(position) but that didn't help. So my question is why is that happening?
I tried to find the solution on internet but didn't find anything useful. Thanks.
I think you are recreating you Adapter each time when new data is come.You should use the same adapter, add new data to previous list and call notifyDataSetChange()
I am trying to populate a custom Android ListView from a List. I am using sugar ORM to save and get data from a database. In my Activity I use the following 2 lines to get the data, and put it in a simple listview.
List<Fish> fishList = Select.from(Fish.class).orderBy("species").list();
setListAdapter(new ArrayAdapter<Fish>(this,android.R.layout.simple_list_item_1, fishList));
This works as expected and displays the getString() method from the Fish class.
Every method I have found for populating a custom listview uses ArrayList but fishList is just a List. I have tried probably 4 or 5 tutorials and they all come up short. Most just describe populating a list manually, but not how to do it if I already have the data in a database.
I have the ArrayAdapter classes set up and at one point had it working where it would just load the most recent object into the list. I suspected some kind of loop was needed but couldn't get that working after hours of trying.
Is there a way to populate a custom listview using my List, or do I need to convert it to an ArrayList somehow, and if so, how do I do that for all items in the List?
Can I replace the first line so it gets the data from the database and puts it in an ArrayList right away?
I apologize if this is super simple (I'm sure it is) but I have spent 4 days trying to find a solution before resorting to asking a question here. Thank you so much for any help you can provide.
Found Exactly what I needed here:ListView Populating using Custom Class
In my My onCreate()
adapter = new ListAdapter(this);
listView = getListView();
List<Fish> fishList = Select.from(Fish.class).orderBy("species").list(); //get data from database (SugarORM)
adapter.setData(fishList);
listView.setAdapter(adapter);
Use a BaseAdapter:
http://developer.android.com/reference/android/widget/BaseAdapter.html
Refer to this tutorial:
http://www.vogella.com/tutorials/AndroidListView/article.html
I am trying to reload the list view when the data has changed. But its not working.Here is the code I am using
localPits.clear();//
this.adapter.clear();
//Fetch new data and update the list
this.localPits.addAll(pl);
this.adapter.notifyDataSetChanged();
this.lst_Pits.invalidate();
Each time I call this portion of code existing values are successfully removed. But new values are not loaded in the list view.
How can I do this in android?
Thanks
It's not terribly clear, but I suspect the new values aren't being loaded because you're clearing the adapter without updating it.
Your 2nd line: this.adapter.clear();
You need to update and add the adapter before you call invalidate(). Or, at least, that's as far as I can gather.
this.adapter.clear(); should not be needed. It must reset the links between adapter and localPits.
If you need to keep this, update list adapter localPits.setAdapter(adapter);. It should fix your problem.