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POAndroid - return value from thread
 

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  1. POAndroid - return value from thread
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    <p>I have a function that retrieve images from the resource and display it in a <code>GridView</code>. Everithing works fine but due to a performance issue I would like to create at runtime thumbs so I create a new <code>ProgressDialog</code> to let know the user that the app is working:</p> <pre><code>import java.util.ArrayList; import android.app.Fragment; import android.app.ProgressDialog; import android.content.res.TypedArray; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.os.Bundle; import android.view.InflateException; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.GridView; import com.italiandevteam.chuck.adapter.GridViewAdapter; import com.italiandevteam.chuck.model.ImageItem; public class GalleriaPersonaggio extends Fragment{ Integer personaggio = null; private ProgressDialog progressDialog; TypedArray imgs = null; final ArrayList imageItems = new ArrayList(); public GalleriaPersonaggio( int personaggio ){ this.personaggio = personaggio; } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { int id = getIdPersonaggio(); View rootView = null; try { rootView = inflater.inflate(R.layout.gallery_grid, container, false); } catch (InflateException e) { } final GridView gridView = (GridView) rootView.findViewById(R.id.gridView); GridViewAdapter customGridAdapter = new GridViewAdapter(getActivity(), R.layout.gallery_row, getData(personaggio)); gridView.setAdapter(customGridAdapter); gridView.setOnItemClickListener(new OnItemClickListener() { public void onItemClick(AdapterView&lt;?&gt; parent, View v, int position, long id) { // HashMap&lt;String, Object&gt; hm = gridView.getAdapter().getPosition(position); // // String imgPath = (String) hm.get("flag"); //get downloaded image path // Intent i = new Intent(getActivity(), MostraImmagine.class); //start new Intent to another Activity. // i.putExtra("ClickedImagePath", imgPath ); //put image link in intent. // startActivity(i); } }); return rootView; } public int getIdPersonaggio(){ return this.personaggio; } private ArrayList getData(int personaggio) { // retrieve String drawable array switch( personaggio ) { case 1:{ imgs = getResources().obtainTypedArray(R.array.chuck_ids); break; } case 2:{ imgs = getResources().obtainTypedArray(R.array.sarah_ids); break; } default:{ imgs = getResources().obtainTypedArray(R.array.chuck_ids); } } final ProgressDialog ringProgressDialog = ProgressDialog.show(getActivity(), "Please wait ...", "Loading Images ...", true); ringProgressDialog.setCancelable(true); new Thread(new Runnable() { @Override public void run() { try { int THUMBNAIL_HEIGHT = 100; int THUMBNAIL_WIGHT = 100; for (int i = 0; i &lt; imgs.length(); i++) { Bitmap bitmap = BitmapFactory.decodeResource(getActivity().getResources(), imgs.getResourceId(i, -1)); bitmap = Bitmap.createScaledBitmap(bitmap, THUMBNAIL_HEIGHT, THUMBNAIL_WIGHT, false); // ByteArrayOutputStream baos = new ByteArrayOutputStream(); // bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos); // byte[] imageData = baos.toByteArray(); // InputStream is = new ByteArrayInputStream(imageData); // Bitmap b = BitmapFactory.decodeStream(is); imageItems.add(new ImageItem(bitmap, "Image#" + i)); } } catch (Exception e) { } ringProgressDialog.dismiss(); } }).start(); return imageItems; } } </code></pre> <p>The problem is that at the end the code doesn't return anything, the <code>GridView</code> is empty, if I remove the thread it works well.</p>
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    1. USChristian Giupponi
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    1. COYou'll need to create a `Handler` to tell the UI thread to update the GridView once you've retrieved the data. To make it easier, Android provides the `AsyncTask`: http://developer.android.com/reference/android/os/AsyncTask.html
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    2. COHow can I pass my ArrayList to the AsyncTask?
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    3. CO@ChristianGiupponi i made a quick example of AsyncTask if you still need help.
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      1. USJJ86
 

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