CODEWITHSUNDEEP
androidsqliteandroid-listviewandroid-cursoradapter
Mokkapps
Mokkapps

Reputation: 2028

How to use EndlessAdapter in ListView with a custom CursorAdapter

I am using a custom CursorAdapter to load articles from my SQLite database and attach it to my ListView. Now I want to use CWAC EndlessAdapter in my app. I found no example using a CursorAdapter just the demo code of the library and this example with an ArrayList.

So to be specific:

  1. How can I tell my SQLite database to get i.e the next 20 entries if available? Should I do this as explained in this solution?

  2. Which changes are necessary in the EndlessAdapter to use it with a custom CursorAdapter?

Are there any examples available that show the use of a own adapter not with ArrayLists?

Thanks in advance for your help!

Upvotes: 1

Views: 946

Answers (1)

Mokkapps
Mokkapps

Reputation: 2028

So I solved the problem this way without using the EndlessAdapter library:

My ListFragment implements AbsListView.OnScrollListener and set a OnScrollListener on my listview as described in this post:

currentPage = 0;
listView.setOnScrollListener(this);

Then I added this two methods:

/**
 * Method to detect scroll on listview
 */
@Override
public void onScroll(AbsListView view, int firstVisibleItem,
                     int visibleItemCount, int totalItemCount) {
    // Leave this empty
}

/**
 * Method to detect if scrolled to end of listview
 */
@Override
public void onScrollStateChanged(AbsListView listView, int scrollState) {
    if (scrollState == SCROLL_STATE_IDLE) {
        if (listView.getLastVisiblePosition() >= listView.getCount() - 1 - threshold) {
            Log.d(TAG, "Scrolled to end of list, load more articles");
            currentPage++;
            Log.d(TAG, "CurrentPage for EndlessAdapter:" + currentPage);
            // Load more articles
            loadMoreArticles(currentPage);
        }
    }
}

/**
 * Method to load more articles if scrolled to end of listview
 */
private void loadMoreArticles(int currentPage) {
    int from = currentPage * 10;
    int to = currentPage * 20;
    if(dba.getArticlesCount() < to){
        Log.d(TAG, "Not enough articles available! ArticleCount: "+ dba.getArticlesCount() + " ,tried to load " + to);
        listView.removeFooterView(footerView);
    }else{
        Log.d(TAG, "Load the next articles, from " + from + " to " + to);
        articleCursor = dba.getXArticles(0, to);
        adapter.changeCursor(articleCursor);
        adapter.notifyDataSetChanged();
    }
}

To get the correct cursor from database:

/**
 * Reading all rows from database
 */

public Cursor getXArticles(int from, int to) {

String selectQuery = "SELECT  * FROM " + TABLE_RSS
        + " ORDER BY date DESC LIMIT " + from + ", " + to;
Log.d(TAG, "getXArticle SQL: " + selectQuery);
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
return cursor;
}

Upvotes: 3

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