The following is my working code using ArrayAdapter. Let’s assume the reponse data from web service looks like the following: [ { “id”: “1”, “name”: “Information Technology” }, { “id”: “2”, “name”: “Human Resources” }, { “id”: “3”, “name”: “Marketing and PR” }, { “id”: “4”, “name”: “Research and Developement” } ] Then in your … Read more
An ArrayAdapter displays the value returned by the toString() method, so you will need to override this method in your custom Object class to return the desired String. You will also need to have at least a getter method for the URL, so you can retrieve that in the click event. public class NewsObject { … Read more
An answer, provided by @BNK, is correct. However, I would like to give a similar solution, which doesn’t require the whole ArrayAdapter class file. Instead, we will just extend that class and override its only 2 methods: getView() and getFilter(). So, define your AutoSuggestAdapter class: import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ArrayAdapter; … Read more
Use OnItemClickListener ListView lv = getListView(); lv.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> adapter, View v, int position, long arg3) { String value = (String)adapter.getItemAtPosition(position); // assuming string and if you want to get the value on click of list item // do what you intend to do on click of listview row } }); … Read more
notifyDataSetChanged() won’t work for you. Reasons why Your adapter loses reference to your list. Always creating and adding a new list to the Adapter. Do like this: initialize the ArrayList while declaring globally. ArrayList<MyItemType> myArrayList=new ArrayList<>(); // as a global variable Add List to the adapter directly without checking null and empty condition. Set the … Read more
Actually I noticed that I should have been using ‘originalItems’ list to build the new filtered one in performFiltering. This will fix any issues that you see regarding changing the text in the filter. E.g. you search for ‘Bread’ then backspace to just a ‘B’ and you should see all ‘B’s. In my original post … Read more
I was having similar issues, but when clicking an item in the custom list, the items on the screen would reverse in sequence. If I clicked again, they’d reverse back to where they were originally. After reading this, I checked my code where I overload the getView method. I was getting the view from the … Read more
Change your code at below. I think you’re missing that. public class AlphabeticalAdapter extends ArrayAdapter<String> { int layoutResourceId; private final Context context; private List<String> data; private List<String> tags; private ProgressDialog mProgressDialog; private ImageView downloadImageButton; public AlphabeticalAdapter(Context context, int resource, List<String> data) { super(context, resource, data); this.layoutResourceId = resource; this.context = context; this.data = data; tags … Read more
As Romain Guy explained a while back during the Google I/O session, the most efficient way to only update one view in a list view is something like the following (this one update the whole View data): ListView list = getListView(); int start = list.getFirstVisiblePosition(); for(int i=start, j=list.getLastVisiblePosition();i<=j;i++) if(target==list.getItemAtPosition(i)){ View view = list.getChildAt(i-start); list.getAdapter().getView(i, view, … Read more
Understand how listview recycling works How ListView’s recycling mechanism works You cannot recycle a row that is presently in use. The above link explains how listview recycling mechanism works So What is the benefit of using ViewHolder? Quoting docs Your code might call findViewById() frequently during the scrolling of ListView, which can slow down performance. … Read more