Add dynamically images to a GridView in Android

Question

private class Task_xmlparse extends AsyncTask { private final ProgressDialog dialog = new ProgressDialog(BlackSheepimage.this); protected void onPreExecute() { this.dialog.setMessage("Loading..."); this.dialog.setCancelable(false); this.dialog.show(); }

    @Override
    protected Void doInBackground(String... params)
    {
        try {

            DomFeedParser dom = new DomFeedParser(url);
            Log.v("thread"," "+url);
            List<Message_thbnail> l_obj_tnail = new ArrayList<Message_thbnail>();
            List<Message_zoom> l_obj_zoom = new ArrayList<Message_zoom>();
            l_obj_tnail = dom.parse_tnail();
            l_obj_zoom = dom.parse_zoom();
            VAL1 = new String[l_obj_tnail.size()];
            VAL2= new String[l_obj_zoom.size()];
            //Log.v("bufersize",""+bufferarray.length);
            //Log.v("val2Length",""+VAL1.length);
            Iterator<Message_thbnail> it_tnail = l_obj_tnail.iterator();
            while (it_tnail.hasNext())
            {
                k++;
                Log.v("Zoo",""+zo);
                VAL1[k] = it_tnail.next().toString();
                bufferarray[zo]=VAL1[k];
                Log.v("Buffer",bufferarray[zo]);
                zo++;


            }
            Log.v("threadbuffsize",""+zo);
            Iterator<Message_zoom> it_zoom = l_obj_zoom.iterator();
            Log.v("zoosize", ""+l_obj_zoom.size());
            while (it_zoom.hasNext()) {
                k1++;

                Log.v("Zoo1",""+zo1);
                VAL2[k1] = it_zoom.next().toString();
                zoombufferarray[zo1]=VAL2[k1];
                zo1++;
                Log.v("tag",VAL2[k1].toString());

            }

            thumbnail_disp=bufferarray;
            grid= new GridAdapter(BlackSheepimage.this,bufferarray);
        } catch (Exception e) {
            //Log.v("Image", "dom" + e);
        }

        return null;
    }


protected void onPostExecute(Void result) {

    lay2_gv.setAdapter(grid);
    if (this.dialog.isShowing()) {
        this.dialog.dismiss();
    }
}

}

public void onCreate(Bundle savedInstanceState) { url="http://www.theblacksheeponline.com/partypics.php?page="+pageno; super.onCreate(savedInstanceState); lay2_gv = (GridView) findViewById(R.id.jr_lookbook_grid); new Task_xmlparse().execute(url); tv = (TextView) findViewById(R.id.next_pg); tv.setOnClickListener(this) ; lay2_gv.setOnItemClickListener(this); } public void onClick(View arg0) {

        pageno++;
        Log.v("pge",""+pageno);
        lay2_gv.setVisibility(GridView.GONE);
        url="http://www.theblacksheeponline.com/partypics.php?page="+pageno;
        //Log.v("URL",url);
         new Task_xmlparse().execute(url);

}

Answer 1

I don't think using Intent is the right thing for you here. As I gather it, you parse an xml to display images and you want to be able to add more images when users click on a button. So here is what you need to do :

in the onClick method of your button, you should start an AsyncTask or a background Thread, in which you make an http request on your url.

This will get you the xml of the next images, you parse it and prepare the images in your background Thread.

Then back in your main Thread (in onClick method for instance), you grab these images, add them to the adapter of your GridView and call notifyDataSetChanged() to update your GirdView. And that should do the trick.