¿Por qué estoy obteniendo nullpointer en onMeasure en GridView

Estoy recibiendo una excepción nullpointer cuando intento establecer imágenes en una vista de cuadrícula usando Universal Image Loader. El fallo se produce justo cuando se descarga la primera imagen y se descarga exactamente una imagen antes de que la aplicación se bloquee. (Comprobado con httpscoop)

Editar: Esto es incorrecto. El bloqueo ocurre antes de descargar la primera imagen, por lo que probablemente intenta medir una imagen que no existe.

Esta es mi rejilla

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <ImageView android:id="@+id/gridImageView" android:layout_width="match_parent" android:layout_height="match_parent" android:src="@drawable/ic_launcher" android:contentDescription="@string/gallery_grid_image_desc"/>

El diseño gridview es simplemente un gridview

 <GridView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/galleryPicturesGrid" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:verticalSpacing="@dimen/gallery_grid_spacing" android:horizontalSpacing="@dimen/gallery_grid_spacing" android:numColumns="3" />

Mi getView

  @Override public View getView(int position, View convertView, ViewGroup parent) { View view = convertView; ViewHolder holder = null; Log.d(TAG, "getView " + position); if (view == null) { view = ((Activity) context).getLayoutInflater().inflate( R.layout.gallery_grid_item, null); holder = new ViewHolder(); holder.thumb = (ImageView) view.findViewById(R.id.gridImageView); view.setTag(holder); } else { holder = (ViewHolder) view.getTag(); } Picture picture = mPictures.valueAt(position); mImageLoader.displayImage(picture.getThumbUrl(), holder.thumb, mImageOptions); return null; }

Configuración de ImageLoader

  ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder( getApplicationContext()).memoryCacheSize(2 * 1024 * 1024) .discCache(new UnlimitedDiscCache(cacheDir)) .denyCacheImageMultipleSizesInMemory() .offOutOfMemoryHandling() .threadPoolSize(4) .discCacheFileNameGenerator(new Md5FileNameGenerator()) .memoryCache(new UsingFreqLimitedMemoryCache(2 * 1024 * 1024)) .tasksProcessingOrder(QueueProcessingType.LIFO) .imageDownloader(new UrlConnectionImageDownloader(this)) .build();

Y Opciones

  galleryThumbImageOptions = new DisplayImageOptions.Builder() .showStubImage(R.drawable.p1_cover) .cacheOnDisc() .bitmapConfig(Bitmap.Config.RGB_565) .build();

Y la excepción

 01-18 10:56:15.434: E/AndroidRuntime(4089): FATAL EXCEPTION: main 01-18 10:56:15.434: E/AndroidRuntime(4089): java.lang.NullPointerException 01-18 10:56:15.434: E/AndroidRuntime(4089): at android.widget.GridView.onMeasure(GridView.java:937) 01-18 10:56:15.434: E/AndroidRuntime(4089): at android.view.View.measure(View.java:8313) 01-18 10:56:15.434: E/AndroidRuntime(4089): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138) 01-18 10:56:15.434: E/AndroidRuntime(4089): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 01-18 10:56:15.434: E/AndroidRuntime(4089): at android.view.View.measure(View.java:8313) 01-18 10:56:15.434: E/AndroidRuntime(4089): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138) 01-18 10:56:15.434: E/AndroidRuntime(4089): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 01-18 10:56:15.434: E/AndroidRuntime(4089): at android.view.View.measure(View.java:8313) 01-18 10:56:15.434: E/AndroidRuntime(4089): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138) 01-18 10:56:15.434: E/AndroidRuntime(4089): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1017) 01-18 10:56:15.434: E/AndroidRuntime(4089): at android.widget.LinearLayout.measureVertical(LinearLayout.java:386) 01-18 10:56:15.434: E/AndroidRuntime(4089): at android.widget.LinearLayout.onMeasure(LinearLayout.java:309) 01-18 10:56:15.434: E/AndroidRuntime(4089): at android.view.View.measure(View.java:8313) 01-18 10:56:15.434: E/AndroidRuntime(4089): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138) 01-18 10:56:15.434: E/AndroidRuntime(4089): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 01-18 10:56:15.434: E/AndroidRuntime(4089): at android.view.View.measure(View.java:8313) 01-18 10:56:15.434: E/AndroidRuntime(4089): at android.widget.LinearLayout.measureVertical(LinearLayout.java:531) 01-18 10:56:15.434: E/AndroidRuntime(4089): at android.widget.LinearLayout.onMeasure(LinearLayout.java:309) 01-18 10:56:15.434: E/AndroidRuntime(4089): at android.view.View.measure(View.java:8313) 01-18 10:56:15.434: E/AndroidRuntime(4089): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138) 01-18 10:56:15.434: E/AndroidRuntime(4089): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 01-18 10:56:15.434: E/AndroidRuntime(4089): at android.view.View.measure(View.java:8313) 01-18 10:56:15.434: E/AndroidRuntime(4089): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138) 01-18 10:56:15.434: E/AndroidRuntime(4089): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 01-18 10:56:15.434: E/AndroidRuntime(4089): at android.view.View.measure(View.java:8313) 01-18 10:56:15.434: E/AndroidRuntime(4089): at android.view.ViewRoot.performTraversals(ViewRoot.java:839) 01-18 10:56:15.434: E/AndroidRuntime(4089): at android.view.ViewRoot.handleMessage(ViewRoot.java:1859) 01-18 10:56:15.434: E/AndroidRuntime(4089): at android.os.Handler.dispatchMessage(Handler.java:99) 01-18 10:56:15.434: E/AndroidRuntime(4089): at android.os.Looper.loop(Looper.java:123) 01-18 10:56:15.434: E/AndroidRuntime(4089): at android.app.ActivityThread.main(ActivityThread.java:3683) 01-18 10:56:15.434: E/AndroidRuntime(4089): at java.lang.reflect.Method.invokeNative(Native Method) 01-18 10:56:15.434: E/AndroidRuntime(4089): at java.lang.reflect.Method.invoke(Method.java:507) 01-18 10:56:15.434: E/AndroidRuntime(4089): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 01-18 10:56:15.434: E/AndroidRuntime(4089): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 01-18 10:56:15.434: E/AndroidRuntime(4089): at dalvik.system.NativeStart.main(Native Method)