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POHow to improve the scroll speed of my listview
 

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  1. POHow to improve the scroll speed of my listview
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    <blockquote> <p><strong>Edit:</strong> Ok, i took the advice given in the answers and the difference is <strong>huge!</strong> I've replaced my SeriesAdapter in the post with the new one. For one a know make the calculations with in the sql query (to know total number of episodes and totalt numer of watched episodes). I also store the bitmap in a hashmap once it has been loaded so that it don't have to load twice, I'm looking in to some other solution as I'm afraid of OutOfMemoryException.</p> </blockquote> <p>I am new to android and i want to display an listview with images that i have stored on the external storage. </p> <p>The images are downloaded earlier and are now as I said stored in the external storage, here is an example of the images <a href="http://thetvdb.com/banners/graphical/80348-g32.jpg" rel="nofollow">http://thetvdb.com/banners/graphical/80348-g32.jpg</a> and I compress the images to 80% when saving them to save some space.</p> <p>I have tried several methods to make the listview scroll smooth but I'm clearly in over my head here. I have provided my layout for the list items and my adapter in case I do something strange here.</p> <p>I would appreciate any tips and tricks that would improve my listview.</p> <p>SeriesAdapter:</p> <pre><code>public static class SeriesAdapter extends ArrayAdapter&lt;Series&gt; { static class viewHolder { ImageView image; TextView information; String seriesId; String season; ProgressBar progress; TextView txtSmallView; } private final Context context; private final ArrayList&lt;Series&gt; series; private DateHelper dateHelper; private final DatabaseHandler db; Object mActionMode; int resource; public SeriesAdapter(Context context, int resource, ListView lv, ArrayList&lt;ExtendedSeries&gt; objects) { super(context, resource, objects); this.context = context; this.series = objects; this.resource = resource; db = new DatabaseHandler(context); dateHelper = new DateHelper(); cache = new HashMap&lt;String, Bitmap&gt;(); } @Override public View getView(int position, View convertView, ViewGroup parent) { viewHolder holder; ExtendedSeries s = series.get(position); if(convertView == null) { convertView = View.inflate(context, resource, null); holder = new viewHolder(); holder.image = (ImageView)convertView.findViewById(R.id.imgSeriesImage); holder.information = (TextView)convertView.findViewById(R.id.txtUpcomingEpisode); holder.progress = (ProgressBar)convertView.findViewById(R.id.pgrWatched); convertView.setTag(holder); } else { holder = (viewHolder)convertView.getTag(); } if(s != null) { holder.seriesId = s.getImage(); convertView.setTag(R.string.homeactivity_tag_id,s.getID()); convertView.setTag(R.string.homeactivity_tag_seriesid,s.getSeriesId()); holder.progress.setMax(s.getTotalEpisodes()); holder.progress.setProgress(s.getWatchedEpisodes()); holder.image.setImageBitmap(getBitmapFromCache(s.getImage())); holder.information.setText(s.getNextEpisodeInformation().equals("") ? context.getText(R.string.message_show_ended) : s.getNextEpisodeInformation()); } return convertView; } </code></pre> <p>Listitem layout</p> <pre><code>&lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" &gt; &lt;ImageView android:id="@+id/imgSeriesImage" android:layout_width="fill_parent" android:layout_height="wrap_content" android:adjustViewBounds="true" android:focusable="false" android:scaleType="centerCrop" android:src="@drawable/noimage" /&gt; &lt;RelativeLayout android:id="@+id/relProgressView" android:layout_width="match_parent" android:layout_height="wrap_content" android:focusable="false" android:orientation="vertical" &gt; &lt;ProgressBar android:id="@+id/pgrWatched" style="?android:attr/progressBarStyleHorizontal" android:layout_width="fill_parent" android:layout_height="21dp" android:max="100" android:progress="50" android:progressDrawable="@drawable/progressbar" /&gt; &lt;TextView android:id="@+id/txtUpcomingEpisode" android:layout_width="match_parent" android:layout_height="wrap_content" android:focusable="false" android:padding="3dp" android:scrollHorizontally="true" android:scrollbars="none" android:shadowColor="@android:color/black" android:shadowDx="1" android:shadowDy="1" android:shadowRadius="1" android:textAllCaps="true" android:textColor="#ffffffff" android:textSize="11sp" android:textStyle="normal|bold" android:typeface="normal" /&gt; &lt;/RelativeLayout&gt; </code></pre> <p></p> <p>Activity layout</p> <pre><code>&lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="wrap_content" android:layout_height="wrap_content" &gt; &lt;ListView android:id="@+id/lstMySeries" android:layout_width="0dp" android:layout_height="fill_parent" android:layout_weight="1" android:longClickable="true" android:divider="#000000" /&gt; </code></pre> <p></p>
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    1. COI don't see listview in your xml. Have you made sure the layout height isn't defined as wrap content?
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      1. USmango
    2. COI added the code for my activity, the listview is fill_parent, that's not wrong is it?
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