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POWhy does the GalleryView not refresh with new items?
 

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  1. POWhy does the GalleryView not refresh with new items?
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    <p>I am going crazy trying to figure this out. I have tried everything I knew and nothing seem to be working. Any help in the right direction is much appreciated.</p> <p>GalleryView does not refresh when in the same activity I press a button to start a ProgressDialog (in onPreExecute() method of AsyncTask) to update the String array that holds the items to be displayed in the GalleryView. In onPostExecute() of AsyncTask, I tried to call notifyDataSetChanged() on my adapter followed by setAdapter() on the GalleryView. onPostExecute(), I believe, works on the UI thread. Also, I tried calling notifyDataSetChanged() and setAdapter() in runOnUiThread() but that doesn't seem to work either. GalleryView does not refresh automatically with new items. It does, only when I scroll the view out of the screen and then back in again. The view updates with the new item only then.</p> <p>Below is the code in parts:</p> <p>On button click event, calling execute on UpdateGalleryview that extends AsyncTask</p> <pre><code>refresh.setOnClickListener(new Button.OnClickListener() { public void onClick(View v) { UpdateGalleryview updateGalleryview=new UpdateGalleryview(); updateGalleryview.execute(GalleryView.this); } }); </code></pre> <p>Then in onPreExecute() method of UpdateGalleryview class, I am creating a ProgressDialog and updating the array that is sent to the Adapter of GalleryView.</p> <pre><code>private class UpdateGalleryview extends AsyncTask&lt;Context, Integer, String&gt; { @Override protected void onPreExecute() { final ProgressDialog dialog = ProgressDialog.show(GalleryView.this, "Refresh", "Loading... please wait", true); new Thread(new Runnable(){ public void run(){ //Updating the Uri[] that is sent to the Adapter for GalleryView File[] imagelist; File images = new File("/sdcard/thumbs/"); imagelist = images.listFiles(); mFiles = new String[imagelist.length]; for(int i= 0 ; i&lt; imagelist.length; i++){ mFiles[i] = imagelist[i].getAbsolutePath(); } mUrls = new Uri[mFiles.length]; for(int i=0; i &lt; mFiles.length; i++){ mUrls[i] = Uri.parse(mFiles[i]); } dialog.dismiss(); } }).start(); Log.i( TAG, "onPreExecute()" ); super.onPreExecute(); } </code></pre> <p>Then, in onPostExecute() of AsyncTask, I am calling another thread that runs on UI</p> <pre><code>@Override protected void onPostExecute( String result ) { runOnUiThread(updateAdapter); // gaAdapter.notifyDataSetChanged(); // ga.setAdapter(gaAdapter); // ga.invalidate(); // ga.setSelection(midposition); super.onPostExecute(result); } </code></pre> <p>As you can see above, I even tried to update the Adapter (gaAdapter) with new items and the GalleryView (ga) within onPostExecute() itself. But that didn't work. So I created the new thread to do it, as below.</p> <pre><code>private Runnable updateAdapter = new Runnable() { @Override public void run() { // TODO Auto-generated method stub gaAdapter.notifyDataSetChanged(); ga.setAdapter(gaAdapter); // ga.invalidate(); ga.setSelection(midposition); } }; </code></pre> <p>This is my Adapter code</p> <pre><code>public class ImageAdapter extends BaseAdapter { private Context ctx; int imageBackground; public ImageAdapter(Context c) { ctx = c; TypedArray ta = obtainStyledAttributes(R.styleable.Gallery1); imageBackground = ta.getResourceId(R.styleable.Gallery1_android_galleryItemBackground, 1); ta.recycle(); } @Override public int getCount() { return imagelist.length; } @Override public Object getItem(int arg0) { return arg0; } @Override public long getItemId(int arg0) { return arg0; } @Override public View getView(int arg0, View arg1, ViewGroup arg2) { ImageView iv = new ImageView(ctx); iv.setImageURI(mUrls[arg0]); iv.setScaleType(ImageView.ScaleType.CENTER_INSIDE); iv.setLayoutParams(new Gallery.LayoutParams(180,144)); iv.setBackgroundResource(imageBackground); return iv; } } </code></pre> <p>This is where I am at. GalleryView does not refresh automatically by doing the above.</p>
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    1. PO
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    1. PTQuestion
    1. USAbhishek Sharma
    1. USAbhishek Sharma
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
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    1. This table or related slice is empty.
    1. COIf you post your code it might be easier to help you out.
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      1. POWhy does the GalleryView not refresh with new items?
      1. USBobbake4
    2. CO+1 to posting an example.
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      1. POWhy does the GalleryView not refresh with new items?
      1. USC0deAttack
    3. COI have edited my post with the code.
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      1. POWhy does the GalleryView not refresh with new items?
      1. USAbhishek Sharma
 

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