Android Open Source - epgreader-android Item List Adapter

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License

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

package com.jeffpalm.android.epg.app;
/*from   ww  w . j  a  va  2  s  .c  om*/
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.annotation.TargetApi;
import android.content.Context;
import android.os.Build;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;

import com.example.android.imagedownloader.ImageDownloader;
import com.jeffpalm.android.epg.app.R;
import com.jeffpalm.android.tmz.model.TMZItem;
import com.jeffpalm.android.tmz.model.TMZLinkItem;
import com.jeffpalm.android.tmz.model.TMZSection;

/**
 * An adapter that holds a single TMZ instance and enumerates the child sections of the index and
 * link items.
 */
public class ItemListAdapter extends BaseAdapter {

  private final static String TAG = "TMZAdapter";

  private final Context mContext;
  private final ImageDownloader mImageDownloader;
  private LayoutInflater mLayoutInflater;

  private final Map<String, Boolean> isItemExpandedMap = new HashMap<String, Boolean>();

  private ArrayList<TMZItem<?>> tmzItems = new ArrayList<TMZItem<?>>();
  private String mSectionName;

  private final int mMaxTitleLines;
  private final int mMaxDescriptionLines;
  private final boolean mCanClickOnPhotos;

  interface TMZLinkItemHandler {
    /**
     * called when the photo for the item is clicked.
     * 
     * @param item
     */
    void onPhotoClicked(TMZLinkItem item);

    /**
     * Called when a link item should be shown
     * 
     * @param item
     */
    void onShowButtonClickedForLinkItem(TMZLinkItem item);
  }

  private TMZLinkItemHandler linkItemHandler;

  public void setHandler(TMZLinkItemHandler linkItemPhotoHandler) {
    this.linkItemHandler = linkItemPhotoHandler;
  }

  /**
   * 
   * @param context
   * @param maxTitleLines max lines used in titles or -1 for no limit
   * @param maxDescriptionLines max lines used in descriptions or -1 for no limit
   */
  public ItemListAdapter(Context context, int maxTitleLines, int maxDescriptionLines,
      boolean canClickOnPhotos) {
    mContext = context;
    mLayoutInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    mImageDownloader = EPGReaderUtil.newImageDownloader();
    mMaxTitleLines = maxTitleLines;
    mMaxDescriptionLines = maxDescriptionLines;
    mCanClickOnPhotos = canClickOnPhotos;
  }

  /**
   * Sets the section name, e.g. "Main", "PHOTOS", e.g.
   * 
   * @param sectionName the new section name
   */
  public void setSectionName(String sectionName) {
    mSectionName = sectionName;
  }

  @Override
  public int getCount() {
    return tmzItems.size();
  }

  @Override
  public Object getItem(int position) {
    return tmzItems.get(position);
  }

  @Override
  public long getItemId(int position) {
    return position;
  }

  @Override
  public View getView(int position, View convertView, ViewGroup parent) {

    final TMZItem<?> item = (TMZItem<?>) tmzItems.get(position);

    if (item instanceof TMZLinkItem) {
      RelativeLayout itemView;
      if (convertView == null || convertView.getId() != R.layout.list_epg_link_item) {
        itemView = (RelativeLayout) mLayoutInflater.inflate(R.layout.list_epg_link_item, parent,
            false);
      } else {
        itemView = (RelativeLayout) convertView;
      }
      TMZLinkItem linkItem = (TMZLinkItem) item;
      View v = getLinkItemView(itemView, linkItem);
      if (shouldExpand(linkItem)) {
        expand(linkItem, v);
      } else {
        compress(linkItem, v);
      }
      return v;
    }

    if (item instanceof TMZSection) {
      RelativeLayout itemView;
      if (convertView == null || convertView.getId() != R.layout.list_epg_section) {
        itemView = (RelativeLayout) mLayoutInflater.inflate(R.layout.list_epg_section, parent,
            false);
      } else {
        itemView = (RelativeLayout) convertView;
      }
      return getSectionView(itemView, (TMZSection) item);
    }

    throw new RuntimeException("Item must be link item or section, not  " + item.getClass() + ":"
        + item);
  }

  private View getSectionView(RelativeLayout itemView, final TMZSection item) {
    String title = item.getName();

    Log.v(TAG, "title=" + title);

    TextView titleText = (TextView) itemView.findViewById(R.id.listTitle);
    titleText.setText(title);

    return itemView;
  }

  @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
  private View getLinkItemView(RelativeLayout itemView, final TMZLinkItem linkItem) {
    String title = getName(itemView.getContext(), linkItem);
    String description = linkItem.getDescription();

    TextView titleText = (TextView) itemView.findViewById(R.id.listTitle);
    TextView descriptionText = (TextView) itemView.findViewById(R.id.listDescription);

    titleText.setText(title);

    if (description.trim().length() == 0) {
      // If there is no description text, clicking on the view shows the link.
      itemView.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
          showLinkItem(linkItem);
        }
      });
      hideViewButton(itemView);
      descriptionText.setVisibility(View.GONE);
    } else {
      descriptionText.setText(description);
    }

    return itemView;
  }

  /**
   * Returns the name of the item, possible prepending [VIDEO] or [PHOTOS].
   */
  private String getName(Context context, TMZLinkItem item) {
    StringBuilder sb = new StringBuilder();
    if (item.isVideo()) {
      String videoPrefix = context.getString(R.string.video_prefix);
      // Don't prepend VIDEO if we're on the videos page.
      if (mSectionName == null || !mSectionName.toLowerCase().contains(videoPrefix.toLowerCase())) {
        sb.append("[");
        sb.append(videoPrefix);
        sb.append("] ");
      }
    } else if (item.isPhotos()) {
      String photosPrefix = context.getString(R.string.photos_prefix);
      // Don't prepend PHOTOS if we're on the photos page.
      // TODO(jpalm): Don't check "photo"
      if (mSectionName == null || !mSectionName.toLowerCase().contains("photo")) {
        sb.append("[");
        sb.append(photosPrefix);
        sb.append("] ");
      }
    }
    sb.append(item.getName());
    return sb.toString();
  }

  public void updateItems(List<TMZItem<?>> items) {
    tmzItems = new ArrayList<TMZItem<?>>(items);
    notifyDataSetChanged();
  }

  /**
   * @return whether the link item should be expanded. Returns true for items without descriptions.
   */
  private boolean shouldExpand(TMZLinkItem item) {
    return item.getDescription().length() > 0 && isExpanded(item);
  }

  /** @return whether item is expanded or not, according to the internal mapping. */
  private boolean isExpanded(TMZLinkItem item) {
    Boolean isExpanded = isItemExpandedMap.get(item.getId());
    if (isExpanded == null) {
      isExpanded = false;
    }
    return isExpanded;
  }

  void toggle(TMZLinkItem item, View v, int position) {
    if (isExpanded(item)) {
      compress(item, v);
    } else {
      expand(item, v);
    }
  }

  private void showPhoto(TMZLinkItem linkItem) {
    if (linkItemHandler != null) {
      linkItemHandler.onPhotoClicked(linkItem);
    }
  }

  private void showLinkItem(TMZLinkItem linkItem) {
    if (linkItemHandler != null) {
      linkItemHandler.onShowButtonClickedForLinkItem(linkItem);
    }
  }

  private void setImageVisible(ImageView imageView, final TMZLinkItem linkItem) {
    String imageUrl = linkItem.getThumbnail();
    mImageDownloader.download(imageUrl, imageView);
    imageView.setVisibility(View.VISIBLE);
    if (mCanClickOnPhotos) {
      // Clicking on the image opens a view of the photo
      imageView.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
          showPhoto(linkItem);
        }
      });
    }
  }

  private void showViewButton(View itemView, final TMZLinkItem linkItem) {
    Button viewButton = (Button) itemView.findViewById(R.id.linkItemButtonView);
    viewButton.setVisibility(View.VISIBLE);
    viewButton.setText(getViewText(linkItem));
    viewButton.setOnClickListener(new OnClickListener() {
      @Override
      public void onClick(View v) {
        showLinkItem(linkItem);
      }
    });
  }

  private void hideViewButton(View itemView) {
    Button viewButton = (Button) itemView.findViewById(R.id.linkItemButtonView);
    viewButton.setVisibility(View.GONE);
    viewButton.setOnClickListener(new OnClickListener() {
      @Override
      public void onClick(View v) {
        // Nothing
      }
    });
  }

  void expand(final TMZLinkItem linkItem, View itemView) {
    ImageView imageView = (ImageView) itemView.findViewById(R.id.listImage);
    TextView titleText = (TextView) itemView.findViewById(R.id.listTitle);
    TextView descriptionText = (TextView) itemView.findViewById(R.id.listDescription);

    setImageVisible(imageView, linkItem);

    titleText.setMaxLines(Integer.MAX_VALUE);
    descriptionText.setMaxLines(Integer.MAX_VALUE);
    isItemExpandedMap.put(linkItem.getId(), true);

    showViewButton(itemView, linkItem);
  }

  /**
   * @param linkItem
   * @return the resource id for the button to show the contents of the link item.
   */
  private int getViewText(TMZLinkItem linkItem) {
    if (linkItem.isVideo()) {
      return R.string.view_video;
    }
    if (linkItem.isPhotos()) {
      return R.string.view_photos;
    }
    return R.string.view_story;
  }

  void compress(TMZLinkItem linkItem, View itemView) {
    ImageView imageView = (ImageView) itemView.findViewById(R.id.listImage);
    TextView titleText = (TextView) itemView.findViewById(R.id.listTitle);
    TextView descriptionText = (TextView) itemView.findViewById(R.id.listDescription);
    Button viewButton = (Button) itemView.findViewById(R.id.linkItemButtonView);

    setImageVisible(imageView, linkItem);
    if (viewButton != null) {
      viewButton.setVisibility(View.GONE);
    }

    if (mMaxTitleLines >= 0) {
      titleText.setMaxLines(mMaxTitleLines);
    }
    if (mMaxDescriptionLines >= 0) {
      descriptionText.setMaxLines(mMaxDescriptionLines);
    }
    isItemExpandedMap.put(linkItem.getId(), false);
  }

  public TMZItem<?> getTMZItem(int position) {
    return (TMZItem<?>) getItem(position);
  }
}
Java Source Code List
