im using Picasso for loading my images into an ExpandableHeightGridView .
When Picasso wants to put bitmap into the GridView ( ImageViews ) , it causes a lot of lag . My adapter follows performance guidelines such as ViewHolder . I tried to use Resize , crop and target as well but no difference , any ideas whats the cause and how can i fix it ?
package Adapter;
public class StacksAdapter extends ArrayAdapter<Stack> {
GradientDrawable gd;
private Context mContext;
int width;
int height;
Boolean Tablet;
public StacksAdapter(Context c, int resourceId, List<Stack> items) {
super(c, resourceId, items);
mContext = c;
gd = new GradientDrawable();
gd.setColor(Color.GRAY);
}
static class ViewHolderItem {
ImageView image_front ;
FlatTextView Textview;
RelativeLayout rl;
public void setImage(final ArrayAdapter<Stack> adapter,
final Stack item, final int position, ImageView imgView,
final String id) {
String url = "some url" ;
Utility.customPicasso.load(url).placeholder(gd).resize(120, 150)
.into(imgView, new Callback() {
@Override
public void onSuccess() {
// doing something
}
@Override
public void onError() {
}
});
}
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolderItem ViewHolder;
RelativeLayout retval = null;
Stack stack = getItem(position);
if (convertView != null) {
retval = (RelativeLayout) convertView;
ViewHolder = (ViewHolderItem) convertView.getTag();
}
else {
ViewHolder = new ViewHolderItem();
LayoutInflater mInflater = (LayoutInflater) mContext
.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
retval = (RelativeLayout) mInflater.inflate(R.layout.stack_object,
null);
ViewHolder.image_back = (ImageView) retval
.findViewById(R.id.stack_object_image2);
ViewHolder.rl = (RelativeLayout) retval
.findViewById(R.id.stack_object_rl);
}
ViewHolder.Textview.setText(stack.title);
ViewHolder.rl.setPadding(30, 0, 30, 0);
ViewHolder.setImage(this, stack, position,
ViewHolder.image_front, stack.image_front_id);
retval.setTag(ViewHolder);
return retval;
}
}
and here is my custom Picasso , i configure it once in app startup , which i only set header for its connections :
public static void ConfigurePicasso(Context context) {
OkHttpDownloader downloader = new OkHttpDownloader(context) {
@Override
protected HttpURLConnection openConnection(Uri uri)
throws IOException {
HttpURLConnection connection = super.openConnection(uri);
connection.setRequestProperty("something",
some value);
return connection;
}
};
Picasso.Builder builder = new Picasso.Builder(context);
builder.downloader(downloader);
builder.requestTransformer(RequestTransformer.IDENTITY);
builder.memoryCache(new LruCache(context));
builder.executor(Executors.newSingleThreadExecutor());
customPicasso = builder.build();
}
I figured it out ! i had some db transactions in my adapter , i commented them and now it works brilliantly . I knew opening and closing database could cost resource but the problem was the lag was ONLY at setImageBitmap time not any other times . still a mistery for me but finally done .
Now i save all my data from database in a list then use that list inside my getView . very smooth .