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POBad Listview Performance on Nexus 4, good on Nexus 7
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  1. POBad Listview Performance on Nexus 4, good on Nexus 7
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    copied!<p>I am developing an Android application at the moment. This application has to deal with large lists alot (thousands of entries, it's actually a playlist).</p> <p>To add the possibility to reorder the entries, I use the drag-sort-listview library. Additionally, each row has a ProgressBar in it. This bar is only visible on the current item (so just one for the whole list). However, I am running into huge performance problems on my Nexus 4 (CM 10.1.2 final), while the performance is good at my Nexus 7 (2012, Stock). I tracked the CPU usage while scrolling the list as fast as I can (without using the fastscroll mechanism. On the Nexus 7, CPU usage stayed below 30%, but on the Nexus 4 it hit 80% and the list was extremely laggy. Logcat output had the line </p> <pre><code>I/Choreographer(639): Skipped xx frames! The application may be doing too much work on its main thread. </code></pre> <p>a few times and the UI felt like it would render with 1fps.</p> <p>The problem is that I can't imagine the reason for this. I am using the ViewHolder pattern in my adapter. Because of custom fonts, I am also using a font cache.</p> <p>The getView() Method of my adapter:</p> <pre><code>@Override public View getView(int position, View convertView, ViewGroup arg2) { PlaylistItem playlistItem = items.get(position); ViewHolder holder; if (convertView == null) { convertView = inflater.inflate(R.layout.list_item_playlist, null); holder = new ViewHolder(); holder.tv_artist = (TextView) convertView.findViewById(R.id.tv_artist); holder.tv_number = (TextView) convertView.findViewById(R.id.tv_number); holder.tv_number_in_queue = (TextView) convertView.findViewById(R.id.tv_number_in_queue); holder.tv_title = (TextView) convertView.findViewById(R.id.tv_title); holder.tv_track_length = (TextView) convertView.findViewById(R.id.tv_track_length); holder.progressBar = (ProgressBar) convertView.findViewById(R.id.progressBar1); holder.drag_point = (ImageView) convertView.findViewById(R.id.drag_point); convertView.setTag(holder); } else { holder = (ViewHolder) convertView.getTag(); } //Show Artist and title holder.tv_artist.setText(playlistItem.getArtist()); holder.tv_title.setText(playlistItem.getTitle()); if (queuedItems.get(position) != null) holder.tv_number_in_queue.setText("[" + (queuedItems.get(position) + 1) + "]"); else holder.tv_number_in_queue.setText(""); //Show track length if (playlistItem.getLength() &gt; -1) holder.tv_track_length.setText(playlistItem.getLengthInHours()); else holder.tv_track_length.setText(""); //Show index in playlist holder.tv_number.setText(playlistItem.getDisplayNumber()); // Show the progressbar and set progress if the item is the currently playing one if (playlistItem.getIndex() == currentItem) { holder.progressBar.setVisibility(View.VISIBLE); if (currentTrackLength &gt; 0) { if (holder.progressBar.getMax() != currentTrackLength) { holder.progressBar.setMax(currentTrackLength); } holder.progressBar.setProgress(currentTrackPos); } else { holder.progressBar.setMax(1); holder.progressBar.setProgress(1); } } else { holder.progressBar.setVisibility(View.INVISIBLE); } return convertView; } static class ViewHolder { TextView tv_number; TextView tv_title; TextView tv_artist; TextView tv_track_length; TextView tv_number_in_queue; ProgressBar progressBar; ImageView drag_point; } </code></pre> <p>The layout of a single list item:</p> <p> </p> <pre><code>&lt;RelativeLayout android:id="@+id/rl_top_container" android:layout_width="match_parent" android:layout_height="@dimen/playlist_fragment_item_height" android:background="?attr/background_playlist_item" &gt; &lt;ImageView android:id="@+id/drag_point" android:layout_width="40dp" android:layout_height="match_parent" android:layout_alignParentLeft="true" android:paddingLeft="10dp" android:paddingRight="10dp" android:scaleType="centerInside" android:src="?attr/drag_sort_icon" /&gt; &lt;TextView android:id="@+id/tv_number" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerVertical="true" android:layout_toRightOf="@+id/drag_point" android:text="1" android:textAppearance="?android:attr/textAppearance" android:textColor="?attr/foreground_text_color_secondary" android:textSize="@dimen/playlist_fragment_title_size" /&gt; &lt;RelativeLayout android:id="@+id/rl_container" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_centerVertical="true" android:layout_marginLeft="8dp" android:layout_marginRight="8dp" android:layout_toRightOf="@+id/tv_number" &gt; &lt;TextView android:id="@+id/tv_title" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_toLeftOf="@+id/tv_track_length" android:singleLine="true" android:text="Title" android:textColor="?attr/foreground_text_color" android:textSize="@dimen/playlist_fragment_title_size" /&gt; &lt;TextView android:id="@+id/tv_artist" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@+id/tv_title" android:layout_toLeftOf="@+id/tv_number_in_queue" android:singleLine="true" android:text="Artist" android:textColor="?attr/foreground_text_color_secondary" android:textSize="@dimen/playlist_fragment_artist_size" /&gt; &lt;TextView android:id="@+id/tv_number_in_queue" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBottom="@+id/tv_artist" android:layout_alignParentEnd="true" android:padding="3dp" android:textColor="?attr/foreground_text_color_secondary" android:textSize="@dimen/playlist_fragment_additional_info_size" /&gt; &lt;TextView android:id="@+id/tv_track_length" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentEnd="true" android:layout_alignParentTop="false" android:layout_alignTop="@+id/tv_title" android:padding="3dp" android:textColor="?attr/foreground_text_color_secondary" android:textSize="@dimen/playlist_fragment_additional_info_size" /&gt; &lt;/RelativeLayout&gt; &lt;ProgressBar android:id="@+id/progressBar1" style="?android:attr/progressBarStyleHorizontal" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_marginBottom="@dimen/playlist_fragment_item_margin_progress_bar" android:visibility="invisible" /&gt; &lt;/RelativeLayout&gt; </code></pre> <p></p> <p>The listview:</p> <pre><code>&lt;com.mobeta.android.dslv.DragSortListView android:id="@+id/list_playlist" dslv:drag_handle_id="@+id/drag_point" android:layout_width="match_parent" android:layout_height="match_parent" android:fastScrollEnabled="true" android:dividerHeight="0dp" android:divider="@null" dslv:drag_enabled="true" dslv:collapsed_height="2dp" dslv:drag_scroll_start="0.33" dslv:max_drag_scroll_speed="1.0" dslv:float_alpha="0.6" dslv:slide_shuffle_speed="0.3" dslv:use_default_controller="true"&gt; &lt;/com.mobeta.android.dslv.DragSortListView&gt; </code></pre> <p>I absolutely ran out of ideas. Logcat did only show 2 or 3 GC calls while scrolling by the way, so I think this won't be the reason.</p> <p>Any idea welcome! Thank you.</p> <p>EDIT: Ok now it's getting really weird. Just ran the code on a HTC Desire Z (aka G2... 800Mhz, 512MB RAM) with Android 2.3.5 and Sense... even here it's much smoother than on the Nexus 4?! What is gong on? Could CyanogenMod cause this misbehaviour? I am asking, because I don't want to flash another ROM just because of a suspicion.</p>
 

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