Android Open Source - ProjectStudio Cursor Loader List Fragment

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License

The source code is released under:
Apache License
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Java Source Code

package fragments;
/*ww  w.  j a  v a  2 s  . com*/
import android.database.Cursor;
import android.os.Bundle;
import android.support.v4.app.ListFragment;
import android.support.v4.app.LoaderManager;
import android.support.v4.content.Loader;
import android.support.v4.widget.SimpleCursorAdapter;
import android.text.TextUtils;
import android.util.Log;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.ListView;
import android.widget.SearchView;

import com.example.uniutilproject.R;

import java.sql.SQLException;

import DB_Provider.CourseDataSource;
import DB_Provider.DB_ABSTRACTS;

/**
 * Created by desmond on 18/03/14.
 */
public class CursorLoaderListFragment extends ListFragment
        implements SearchView.OnQueryTextListener, LoaderManager.LoaderCallbacks<Cursor> {

    // This is the Adapter being used to display the list's data.
    SimpleCursorAdapter mAdapter;

    // If non-null, this is the current filter the user has provided.
    String mCurFilter;
    private CourseDataSource dataSource;
    private Cursor cursor;

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        //OPEN DATABASE
        dataSource = new CourseDataSource(getActivity());

        try {
            dataSource.open();
        } catch (SQLException e) {
            e.printStackTrace();
        }

        // Give some text to display if there is no data.  In a real
        // application this would come from a resource.
        setEmptyText("No results found :(");

        // We have a menu item to show in action bar.
        setHasOptionsMenu(true);

        //Get the cursor
        cursor = dataSource.getAllCourses();

        String[] from = {DB_ABSTRACTS.DBCourse.NAME_COLUMN};
        int[] to = {android.R.id.text1};

        //Create an empty adapter we will use to display the loaded data
        mAdapter = new SimpleCursorAdapter(getActivity(), android.R.layout.simple_list_item_2, null,
                from, to , 0);
        setListAdapter(mAdapter);

        //Start out with a progress indicator
        setListShown(false);

        //Prepare the loader.  Either re-connect with an existing one,
        // or start a new one.
        getLoaderManager().initLoader(0, null, this);


    }

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        super.onCreateOptionsMenu(menu, inflater);
        //Place an actionBar item for searching
        MenuItem item = menu.add("Search");
        item.setIcon(R.drawable.ic_search);
        item.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
        SearchView sv = new SearchView(getActivity());
        sv.setOnQueryTextListener(this);
        item.setActionView(sv);


    }

    @Override
    public Loader<Cursor> onCreateLoader(int id, Bundle args) {
        return null;
    }

    @Override
    public void onLoadFinished(Loader<Cursor> loader, Cursor data) {

    }

    @Override
    public void onLoaderReset(Loader<Cursor> loader) {

    }

    @Override
    public boolean onQueryTextSubmit(String s) {
        // Don't care about this.
        return true;
    }

    @Override public void onListItemClick(ListView l, View v, int position, long id) {
        // Insert desired behavior here.
        Log.i("FragmentComplexList", "Item clicked: " + id);
    }

    @Override
    public boolean onQueryTextChange(String newText) {

        // Called when the action bar search text has changed.  Update
        // the search filter, and restart the loader to do a new query
        // with this filter.
        mCurFilter = !TextUtils.isEmpty(newText) ? newText : null;
        getLoaderManager().restartLoader(0, null, this);
        return true;
    }
}
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