VideoAdapter.java

package vandy.mooc.view.ui;

import java.util.ArrayList;
import java.util.List;

import vandy.mooc.R;
import vandy.mooc.model.mediator.webdata.Video;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

/**
 * Show the view for each Video's meta-data in a ListView.
 */
public class VideoAdapter
       extends BaseAdapter {
    /**
     * Allows access to application-specific resources and classes.
     */
    private final Context mContext;

    /**
     * ArrayList to hold list of Videos that is shown in ListView.
     */
    private List<Video> videoList =
        new ArrayList<>();

    /**
     * Construtor that stores the Application Context.
     * 
     * @param Context
     */
    public VideoAdapter(Context context) {
        super();
        mContext = context;
    }

    /**
     * Method used by the ListView to "get" the "view" for each row of
     * data in the ListView.
     * 
     * @param position
     *            The position of the item within the adapter's data
     *            set of the item whose view we want. convertView The
     *            old view to reuse, if possible. Note: You should
     *            check that this view is non-null and of an
     *            appropriate type before using. If it is not possible
     *            to convert this view to display the correct data,
     *            this method can create a new view. Heterogeneous
     *            lists can specify their number of view types, so
     *            that this View is always of the right type (see
     *            getViewTypeCount() and getItemViewType(int)).
     * @param parent
     *            The parent that this view will eventually be
     *            attached to
     * @return A View corresponding to the data at the specified
     *         position.
     */
    public View getView(int position,
                        View convertView,
                        ViewGroup parent) {
        Video video = videoList.get(position);

        if (convertView == null) {
            LayoutInflater mInflater = (LayoutInflater)
                mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView =
                mInflater.inflate(R.layout.video_list_item,null);
        }

        TextView titleText =
            (TextView) convertView.findViewById(R.id.tvVideoTitle);
        titleText.setText(video.getTitle());

        return convertView;
    }

    /**
     * Adds a Video to the Adapter and notify the change.
     */
    public void add(Video video) {
        videoList.add(video);
        notifyDataSetChanged();
    }

    /**
     * Removes a Video from the Adapter and notify the change.
     */
    public void remove(Video video) {
        videoList.remove(video);
        notifyDataSetChanged();
    }

    /**
     * Get the List of Videos from Adapter.
     */
    public List<Video> getVideos() {
        return videoList;
    }

    /**
     * Set the Adapter to list of Videos.
     */
    public void setVideos(List<Video> videos) {
        this.videoList = videos;
        notifyDataSetChanged();
    }

    /**
     * Get the no of videos in adapter.
     */
    public int getCount() {
        return videoList.size();
    }

    /**
     * Get video from a given position.
     */
    public Video getItem(int position) {
        return videoList.get(position);
    }

    /**
     * Get Id of video from a given position.
     */
    public long getItemId(int position) {
        return position;
    }
}