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POHow to add a dynamic view to a ListView item at runtime?
 

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  1. POHow to add a dynamic view to a ListView item at runtime?
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    <p>My problem is that I don't know whether I should use multiple list view or a custom listview item adapter which can grows dynamically. For example, for a particular user, they can have multiple activities:<br> - Take a picture<br> - Say something<br> - Checking in<br> - ... </p> <p>Apparently, this list can grows as the user has done more activities. Most of the time, I often create a custom item adapter which extends from <code>BaseAdapter</code> and use the <code>ItemHolder</code> pattern as follows:</p> <pre><code>public class PlaceItemAdapter extends BaseAdapter { private Activity context; private List&lt;Place&gt; places; private boolean notifyChanged = false; public PlaceItemAdapter(Activity context, List&lt;Place&gt; places) { super(); this.context = context; this.places = places; } public int getCount() { return places.size(); } public Object getItem(int position) { return places.get(position); } public long getItemId(int position) { return position; } public static class ItemViewHolder { TextView nameTextView; TextView typesTextView; TextView ratingTextView; ImageView mapIconImageView; } public View getView(int position, View convertView, ViewGroup parent) { ItemViewHolder holder; LayoutInflater inflater = context.getLayoutInflater(); if (convertView == null) { convertView = inflater.inflate(R.layout.place_item, null); holder = new ItemViewHolder(); holder.nameTextView = (TextView) convertView.findViewById(R.id.place_item_xml_textview_name); holder.typesTextView = (TextView) convertView.findViewById(R.id.place_item_xml_textview_address); holder.ratingTextView = (TextView) convertView.findViewById(R.id.place_item_xml_textview_rating); holder.mapIconImageView = (ImageView) convertView.findViewById(R.id.place_item_xml_imageview_location_icon); convertView.setTag(holder); } else { holder = (ItemViewHolder) convertView.getTag(); } holder.nameTextView.setText(places.get(position).getName()); holder.typesTextView.setText(places.get(position).getAddress()); holder.ratingTextView.setText(Integer.toString(places.get(position).getRating())); /* * This task is time consuming! * TODO: find a workaround to handle the image */ // holder.mapIconImageView.setImageBitmap(DownloadImageHelper.downloadImage(places.get(position).getIconUrl())); holder.mapIconImageView.setImageResource(R.drawable.adium); return convertView; } public void notifyDataSetChanged() { super.notifyDataSetChanged(); notifyChanged = true; } } </code></pre> <p>Using this method, the number GUI widgets is fixed which means I can't make my listview item look like the picture below.</p> <pre><code> public static class ItemViewHolder { TextView nameTextView; TextView typesTextView; TextView ratingTextView; ImageView mapIconImageView; } </code></pre> <p>My initial approach was to create a dynamic view nested inside an adapter item, however it will produce duplicate views. To avoid duplicate view, I have set <code>convertView</code> to null which means each time it loads, it will create a new <code>ItemViewHolder</code> which eventually eats up all my memory. :( So how could I handle this situation? A minimal working example would be greatly appreciated.</p> <p><strong>Duplicate View</strong></p> <pre><code>public class FriendFeedItemAdapter extends BaseAdapter { private List&lt;FriendFeedItem&gt; items; private Activity context; private static LayoutInflater inflater; public ImageLoader imageLoader; private ItemViewHolder viewHolder; public FriendFeedItemAdapter(Activity context, List&lt;FriendFeedItem&gt; items) { this.context = context; this.items = items; inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); imageLoader = new ImageLoader(context.getApplicationContext()); } public int getCount() { return items.size(); } public Object getItem(int position) { return items.get(position); } public long getItemId(int position) { return position; } public static class ItemViewHolder { TableLayout table; ImageView imageViewUserPicture; TextView textViewUsername; TextView textViewWhatUserDo; TextView textViewWhere; TextView textViewTime; ImageView imageViewSnapPictureBox; TextView textViewWriteOnWallMessageBox; } public View getView(int position, View convertView, ViewGroup parent) { if (convertView == null) { convertView = inflater.inflate(R.layout.friend_list_feed_item, null); viewHolder = new ItemViewHolder(); viewHolder.table = (TableLayout) convertView.findViewById(R.id.friend_list_feed_item_xml_tablelayout_table); viewHolder.imageViewUserPicture = (ImageView) convertView.findViewById(R.id.friend_list_feed_item_xml_imageview_user_picture); viewHolder.textViewUsername = (TextView) convertView.findViewById(R.id.friend_list_feed_item_xml_textview_username); viewHolder.textViewWhatUserDo = (TextView) convertView.findViewById(R.id.friend_list_feed_item_xml_textview_what_user_do); viewHolder.textViewWhere = (TextView) convertView.findViewById(R.id.friend_list_feed_item_xml_textview_where); viewHolder.textViewTime = (TextView) convertView.findViewById(R.id.friend_list_feed_item_xml_textview_at_what_time); convertView.setTag(viewHolder); } else { viewHolder = (ItemViewHolder) convertView.getTag(); } imageLoader.displayImage(items.get(position).getFriendPictureUrl(), viewHolder.imageViewUserPicture); viewHolder.textViewUsername.setText(items.get(position).getFriendName()); viewHolder.textViewWhere.setText("at " + items.get(position).getPlaceName()); viewHolder.textViewTime.setText("@" + items.get(position).getActivityTime()); if (items.get(position).getChallengeType() == Challenge.Type.CHECK_IN) { viewHolder.textViewWhatUserDo.setText("has checked in."); } else if (items.get(position).getChallengeType() == Challenge.Type.SNAP_PICTURE) { viewHolder.textViewWhatUserDo.setText("has snap a picture."); // add picture box View rowView = inflater.inflate(R.layout.snap_picture_row_item, null); viewHolder.imageViewSnapPictureBox = (ImageView) rowView.findViewById(R.id.snap_picture_row_item_xml_imageview_picture); imageLoader.displayImage(items.get(position).getActivitySnapPictureUrl(), viewHolder.imageViewSnapPictureBox); viewHolder.table.addView(rowView); } else if (items.get(position).getChallengeType() == Challenge.Type.WRITE_ON_WALL) { viewHolder.textViewWhatUserDo.setText("has written a message on wall."); // add message box View rowView = inflater.inflate(R.layout.write_on_wall_row_item, null); viewHolder.textViewWriteOnWallMessageBox = (TextView) rowView.findViewById(R.id.write_on_wall_row_item_xml_textview_wall_message); viewHolder.textViewWriteOnWallMessageBox.setText(items.get(position).getActivityComment()); viewHolder.table.addView(rowView); } else if (items.get(position).getChallengeType() == Challenge.Type.QUESTION_ANSWER) { viewHolder.textViewWhatUserDo.setText("has answered a question."); } else { // Challenge.Type.OTHER viewHolder.textViewWhatUserDo.setText("has done some other challenges."); } return convertView; } } </code></pre> <p><strong>Extensive Memory Usage</strong></p> <pre><code>public View getView(int position, View convertView, ViewGroup parent) { ItemViewHolder holder = null; LayoutInflater inflater = context.getLayoutInflater(); convertView = inflater.inflate(R.layout.friend_list_feed_item, null); // create holder holder = new ItemViewHolder(); // default field holder.table = (TableLayout) convertView.findViewById(R.id.friend_list_feed_item_xml_tablelayout_table); holder.imageViewUserPicture = (ImageView) convertView.findViewById(R.id.friend_list_feed_item_xml_imageview_user_picture); holder.textViewUsername = (TextView) convertView.findViewById(R.id.friend_list_feed_item_xml_textview_username); holder.textViewWhatUserDo = (TextView) convertView.findViewById(R.id.friend_list_feed_item_xml_textview_what_user_do); holder.textViewWhere = (TextView) convertView.findViewById(R.id.friend_list_feed_item_xml_textview_where); holder.textViewTime = (TextView) convertView.findViewById(R.id.friend_list_feed_item_xml_textview_at_what_time); convertView.setTag(holder); holder.imageViewUserPicture.setImageURI(items.get(position).getFriendPictureUri()); holder.textViewUsername.setText(items.get(position).getFriendName()); holder.textViewWhere.setText("at " + items.get(position).getPlaceName()); holder.textViewTime.setText("@" + items.get(position).getActivityTime()); if (items.get(position).getChallengeType() == Challenge.Type.CHECK_IN) { holder.textViewWhatUserDo.setText("has checked in."); } else if (items.get(position).getChallengeType() == Challenge.Type.SNAP_PICTURE) { holder.textViewWhatUserDo.setText("has snap a picture."); // add picture box View rowView = inflater.inflate(R.layout.snap_picture_row_item, null); holder.imageViewSnapPictureBox = (ImageView) rowView.findViewById(R.id.snap_picture_row_item_xml_imageview_picture); holder.imageViewSnapPictureBox.setImageURI(items.get(position).getActivitySnapPictureUri()); holder.table.addView(rowView); } else if (items.get(position).getChallengeType() == Challenge.Type.WRITE_ON_WALL) { holder.textViewWhatUserDo.setText("has written a message on wall."); // add message box View rowView = inflater.inflate(R.layout.write_on_wall_row_item, null); holder.textViewWriteOnWallMessageBox = (TextView) rowView.findViewById(R.id.write_on_wall_row_item_xml_textview_wall_message); holder.textViewWriteOnWallMessageBox.setText(items.get(position).getActivityComment()); holder.table.addView(rowView); } else if (items.get(position).getChallengeType() == Challenge.Type.QUESTION_ANSWER) { holder.textViewWhatUserDo.setText("has answered a question."); } else { // Challenge.Type.OTHER holder.textViewWhatUserDo.setText("has done some other challenges."); } return convertView; } </code></pre> <p><img src="https://i.stack.imgur.com/QRa5L.png" alt="enter image description here"></p> <p><img src="https://i.stack.imgur.com/DVwbn.png" alt="enter image description here"></p>
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