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POGallery scroll invalidates whole view
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  1. POGallery scroll invalidates whole view
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    copied!<p>I have a Gallery in my layout together with an ImageView and a few TextView widgets. Unfortunately I get low scroll performance for the Gallery on a slow phones. The problem disappears when I remove the background image from the LinearLayout containing ImageView and TextView. I overrrided the onDraw() for the whole view and checked the clip rect - it is always the whole screen. It looks like every time I scroll the gallery (and it is invalidated) the whole screen is invalidated. Is there any way to avoid full screen redraw when I only scroll the Gallery widget?</p> <p>Thanks </p> <pre><code>private class GalleryAdapter extends ArrayAdapter&lt;WeatherDisplayInfo&gt; { LayoutInflater mInflater; Context mContext; public GalleryAdapter(Context context) { super(context, R.layout.gallery_item_view, mForecastData); mContext = context; mInflater = LayoutInflater.from(context); } public int getCount() { return mForecastData.size(); } public WeatherDisplayInfo getItem(int position) { return mForecastData.get(position); } public long getItemId(int position) { return position; } private class ViewHolder { public TextView text_date; public TextView text_forecast; public TextView text_temperature; public TextView text_pressure; public TextView text_humidity; public TextView text_windspeed; public ImageView weather_image; } @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder; if(convertView == null) { if(position == getCount() - 1) { convertView = mInflater.inflate(R.layout.logo_view, null); holder = new ViewHolder(); // store view holder convertView.setTag(holder); } else { convertView = mInflater.inflate(R.layout.gallery_item_view, null); holder = new ViewHolder(); holder.text_date = (TextView) convertView.findViewById(R.id.text_date); holder.text_forecast = (TextView) convertView.findViewById(R.id.text_desc); holder.text_temperature = (TextView) convertView.findViewById(R.id.text_temp); holder.text_pressure = (TextView) convertView.findViewById(R.id.text_pressure); holder.text_humidity = (TextView) convertView.findViewById(R.id.text_humidity); holder.text_windspeed = (TextView) convertView.findViewById(R.id.text_wind); holder.weather_image = (ImageView) convertView.findViewById(R.id.image_weather_view);; // store view holder convertView.setTag(holder); convertView.setDrawingCacheEnabled(true); convertView.buildDrawingCache(); } } else { holder = (ViewHolder) convertView.getTag(); } // set view data return convertView; } </code></pre>
 

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