How to implement searchview in activity (actionbar) when listview exists in fragment

Question

I am developing an application in which searchview is in main activity's action bar. And in the main activity there are 3 fragments. There is a listview in each fragment. The problem is that how can I sort fragment's list item when searchview is implemented in activity's action bar.

I am using simple cursor adapter and listview having custom row in which there are textview and imageview.

This is the code of searchview in activity

SearchManager SManager =  (SearchManager) getSystemService(Context.SEARCH_SERVICE);
    MenuItem searchMenuItem = menu.findItem(R.id.action_search);
    android.support.v7.widget.SearchView searchViewAction = (android.support.v7.widget.SearchView) MenuItemCompat.getActionView(searchMenuItem);
    searchViewAction.setSearchableInfo(SManager.getSearchableInfo(getComponentName()));

    searchViewAction.setIconifiedByDefault(true);

            android.support.v7.widget.SearchView.OnQueryTextListener textChangeListener = new android.support.v7.widget.SearchView.OnQueryTextListener()
    {
        @Override
        public boolean onQueryTextChange(String newText)
        {
            // this is your adapter that will be filtered
            adapter.getFilter().filter(newText);
            System.out.println("on text chnge text: "+newText);
            return true;
        }
        @Override
        public boolean onQueryTextSubmit(String query)
        {
            // this is your adapter that will be filtered
            adapter.getFilter().filter(query);
            System.out.println("on query submit: "+query);
            return true;
        }
    };
    searchViewAction.setOnQueryTextListener(textChangeListener); 

And the code of fragment is

Cursor mCursor = getContacts();
getActivity().startManagingCursor(mCursor);



c_adapter = new SimpleCursorAdapter(getActivity(), R.layout.contact_item, mCursor,
        new String[]{ContactsContract.Contacts.DISPLAY_NAME
                , ContactsContract.Contacts.PHOTO_THUMBNAIL_URI, ContactsContract.Contacts._ID},

        new int[]{R.id.username1, R.id.ivuserpicicon1});



    if (c_adapter.getCount() == 0) {
        Toast.makeText(getActivity(), "No Items Available", Toast.LENGTH_SHORT).show();
    }

    listview = (ListView) view.findViewById(R.id.listview);
    listview.setAdapter(c_adapter);
    listview.setTextFilterEnabled(true);

How can I implement searchview. I need little guidance.

Answer 1

Activity to fragment communication is fairly simple when compared to fragment to activity communication. You can check the following link for both the types of communication

http://developer.android.com/training/basics/fragments/communicating.html#Deliver

In your activity you can get an instance of your fragment containing the ListView and invoke all search and sort operations.

Assuming that you have added

android:actionViewClass="android.widget.SearchView"

for your search menu item in your menu layout file, in the onCreateOptionsMenu of your activity you can add

MenuItem searchItem = menu.findItem(R.id.your_search_menu_item);
    SearchView actionSearchView = (SearchView) searchItem.getActionView();

    actionSearchView.setIconifiedByDefault(false);
    actionSearchView.setOnQueryTextListener(//Set up your OnQueryTextListener here);

In the onQueryTextChange method of the OnQueryTextListener, you can invoke your fragments methods for search and sort.