Discussion :

[Zero]

Bonjour,

J'ai créé un classe qui hérite de SimpleAdapter qui permet d'afficher une liste (ListActivity) avec des images distantes (via HTTP).

Voici le code de ma classe :

Code :

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public class SimpleAdapterWithRemoteImage extends SimpleAdapter {
	Context context = null;
	Map<String, SoftReference<Bitmap>> bitmaps = new HashMap<String, SoftReference<Bitmap>>();
	Map<ImageView, URL> imageviews = new HashMap<ImageView, URL>();
 
 
	public SimpleAdapterWithRemoteImage(Context context, List<Map<String, String>> data, int resource, String[] from, int[] to) {
		super(context, data, resource, from, to);
		this.context = context;
	}
 
	private Bitmap fetchBitmap(String url) {
		SoftReference<Bitmap> bitmapReference =  bitmaps.get(url);
 
		if (bitmapReference!=null) {
			Bitmap bitmap = bitmapReference.get();
			if (bitmap!=null) {
				return bitmap;
			} else {
				bitmaps.remove(url);
			}
		}
 
		return null;
	}
 
	public View getView(int position, View convertView, ViewGroup parent) {
		View v = null;
 
 
		if ( super.getCount()>position) {
			v = super.getView(position, convertView, parent);
 
			if (v!=null) {
				ImageView imageView = (ImageView)v.findViewById(R.id.ad_detail_image);
				if ( imageView!=null) {
					URL url = null;
					String thumb = null;
					try {
						Map<String, String> params = (Map<String, String>)super.getItem(position);
						if ( params!=null) {
							thumb = params.get("image");
							if (thumb != null) {
								url = new URL(thumb);
							} else {
								imageView.setImageResource(R.drawable.blank);
							}
						} else {}
					} catch (MalformedURLException e) {}
 
					imageviews.put(imageView, url);
					if ( thumb!=null) {
						Bitmap bitmap = fetchBitmap(thumb);
						if ( bitmap!=null) {
							imageView.setImageBitmap(bitmap);
						} else {
							try {
								if (url!=null) {
									imageView.setImageResource(R.drawable.blank);
									ImageDownloadTask idt = new ImageDownloadTask();
									idt.execute(new RemoteImageView(imageView, url));
								} else {}
							} catch (RejectedExecutionException e) {}
						}
					} else {
						imageView.setImageDrawable(v.getResources().getDrawable(R.drawable.blank));
					}
				} else {}
			} else {}
		}
 
		return v;
	}
 
	private class RemoteImageView {
		ImageView iv;
		URL url;
 
 
		public RemoteImageView(ImageView iv, URL url) {
			this.iv = iv;
			this.url = url;
		}
	}
 
	private class ImageDownloadTask extends AsyncTask<RemoteImageView, Integer, Bitmap> {
		private RemoteImageView riv;
 
 
		protected Bitmap doInBackground(RemoteImageView... rivs) {
			Bitmap bm = null;
			riv = rivs[0];
 
 
			if ( riv!=null && riv.url!=null) {
				URL url = riv.url;
				InputStream is = null;
 
				try {
					is = url.openConnection().getInputStream();
				} catch (MalformedURLException e) {
				} catch (IOException e) {
				}
 
				if ( is!=null) {
					try {
						bm = BitmapFactory.decodeStream(is);
						bitmaps.put(url.toExternalForm(), new SoftReference<Bitmap>(bm));
					} catch ( OutOfMemoryError e) {}
 
					try {
						is.close();
					} catch (IOException e) {}
				} else {}
			}
 
			return bm;
		}
 
		protected void onPostExecute(Bitmap result) {
			if ( riv!=null && riv.iv!=null && riv.url!=null && riv.url.equals(imageviews.get(riv.iv))) {
				riv.iv.setImageBitmap(result);
			}
		}
	}
}

Dans la plupart des cas, l'application fonctionne très bien. Cependant, je reçois de temps en temps les deux rapports d'erreur suivant :

Code :

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java.lang.NullPointerException
	at android.widget.ListView.setupChild(ListView.java:1735)
	at android.widget.ListView.makeAndAddView(ListView.java:1713)
	at android.widget.ListView.fillUp(ListView.java:670)
	at android.widget.ListView.fillGap(ListView.java:615)
	at android.widget.AbsListView.trackMotionScroll(AbsListView.java:2622)
	at android.widget.AbsListView.onTouchEvent(AbsListView.java:2048)
	at android.widget.ListView.onTouchEvent(ListView.java:3276)
	at android.view.View.dispatchTouchEvent(View.java:3796)
	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:856)
	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:888)
	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:888)
	at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1673)
	at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1114)
	at android.app.Activity.dispatchTouchEvent(Activity.java:2061)
	at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1657)
	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:888)
	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:888)
	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:888)
	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:888)
	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:888)
	at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1673)
	at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1114)
	at android.app.Activity.dispatchTouchEvent(Activity.java:2061)
	at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1657)
	at android.view.ViewRoot.handleMessage(ViewRoot.java:1758)
	at android.os.Handler.dispatchMessage(Handler.java:99)
	at android.os.Looper.loop(Looper.java:136)
	at android.app.ActivityThread.main(ActivityThread.java:4425)
	at java.lang.reflect.Method.invokeNative(Native Method)
	at java.lang.reflect.Method.invoke(Method.java:521)
	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:850)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:608)
	at dalvik.system.NativeStart.main(Native Method)

Code :

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java.lang.IllegalStateException: The content of the adapter has changed but ListView did not receive a notification. Make sure the content of your adapter is not modified from a background thread, but only from the UI thread. [in ListView(16908298, class android.widget.ListView) with Adapter(class com.company.project.SimpleAdapterWithRemoteImage)]
	at android.widget.ListView.layoutChildren(ListView.java:1508)
	at android.widget.AbsListView$CheckForTap.run(AbsListView.java:1930)
	at android.os.Handler.handleCallback(Handler.java:587)
	at android.os.Handler.dispatchMessage(Handler.java:92)
	at android.os.Looper.loop(Looper.java:123)
	at android.app.ActivityThread.main(ActivityThread.java:4627)
	at java.lang.reflect.Method.invokeNative(Native Method)
	at java.lang.reflect.Method.invoke(Method.java:521)
	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
	at dalvik.system.NativeStart.main(Native Method)

Quelqu'un sait-il d'où ça peut venir ? J'ai cherché un peu partout. Amélioré deux ou trois trucs. Mais quelques rares utilisateurs ont toujours ces erreurs.

Merci !