Develop Reference

how to display the sorted list in listview after user presses the sort button?

I am making an Simple Android App to test the sorting capability and then use it on my main project that I will be making.
I want to know that suppose I display a list of items to the user with the help of custom objects and custom ArrayAdapter in the listview and there I want to place a sorting button that will sort the list during runtime according to the choice of the user (ex: alphabetically, according to ratings,etc.).
How to display the new list to the user after sorting.
Should I again use the setAdapter method or is there any other way?

When you click Sort Button , perfom sorting on the list , and in the next line write
yourAdapter.notifyDatasetChanged();
it will update your list with the updated(sorted) Data.

First of all, sort your source data base on the choice of the user (ex: alphabetically, according to ratings,etc.)
Ex:
List<String> mData; // your source data
// sort your data ascending order
Collections.sort(mData);
// use your adapter to update your ListView
mArrayAdapter.notifyDataSetChanged();

If you call notifyDatasetChanged() in your adapter your list will be redrawn in the right order in the screen. :) So after you order you list, call adapter.notifyDatasetChanged()

Shows a list of data that can be filtered while typing in SearchView Android

I don't know how to do it so, can someone give me some working codes about automatically filtering results when I type a data from the search view and get it from the external database? Thanks!

Use textwatcher on edit text.Compare strings taken by textwatcher in afterTextChange method with your list items .Make new list with matched strings and set it in adapter.Use notifyDatasetChange method on adapter to refresh the list.

Listview Row incrementing with new value

I have a listview with radio buttons now i need to add one value from a edittext after typing some thing in the edittext the typed text should appear in the listview as next row.? how it is posible.?

ListView with simpleArrayAdapter :
Follow these steps it may help:
1. Fetch the value from edit text after the user types using gettext()
2. Insert this value in an array.
3. create a list view.
4. create an arrayAdapter with the already created array as source.
5. Now set the adapter with listview using (array variable).setAdapter(adapter name);
For every time the user updates use notifyDataSetChanged() to refresh your listview with the new contents.
Pseudo code:
onClick(){
array.add(editText.gettext());
adapter.notifyDataSetChanged();
}
Click here for more.

Listview delete item from Database

Hey. I have the following code:
final String text = (String) lt.getItemAtPosition(position);
db.removeCategory(text);
What I want to do is to remove a item from a ListView. The problem I have is that I only can remove the item that is in the first position of the list.
Is like the getItemAtPosition(0);
Why's that? Can somebody help?
Thanks

Bind your array to ArrayAdapter and use its remove method to remove particular object. Refer this link to get some understanding of how it works.
Remove ListView items in Android

Why don't you add items into a collection or data datable and then bind it to ListView.
In ste removal phase you delete the item from the collection/data table instead direct one from the ListView.

How do I add List of items that is stored in my Java file into My List Activity?

Can anybody please help me in adding List of items that is stored in my Java file into My List Activity. I fetch the list items from remote database through my JDBC connection (java.sql). Then I try to store it in different variables in a java file. Finally I want to fetch these items and display it in my list. How do I do it?
Also I would like the list items to be dynamic as in future new items might be added.
My List item will be an array List.
Thanks & Regards,
Sneha

For the listView part you will need to write an adapter that fetches the data from your java file and bind it to each row in the listView.
Read this tutorial for custom list views.
Salil