Create thumbnail during instant upload

src/com/owncloud/android/datamodel/ThumbnailsCacheManager.java

@@ -157,6 +157,14 @@ public class ThumbnailsCacheManager {
             mAccount = account;
         }
 
+        public ThumbnailGenerationTask(FileDataStorageManager storageManager, Account account){
+            if (storageManager == null)
+                throw new IllegalArgumentException("storageManager must not be NULL");
+            mStorageManager = storageManager;
+            mAccount = account;
+            mImageViewReference = null;
+        }
+
         public ThumbnailGenerationTask(ImageView imageView) {
             // Use a WeakReference to ensure the ImageView can be garbage collected
             mImageViewReference = new WeakReference<ImageView>(imageView);
@@ -195,7 +203,7 @@ public class ThumbnailsCacheManager {
         }
 
         protected void onPostExecute(Bitmap bitmap){
-            if (bitmap != null) {
+            if (bitmap != null && mImageViewReference != null) {
                 final ImageView imageView = mImageViewReference.get();
                 final ThumbnailGenerationTask bitmapWorkerTask = getBitmapWorkerTask(imageView);
                 if (this == bitmapWorkerTask) {

src/com/owncloud/android/files/services/FileUploader.java

@@ -50,6 +50,7 @@ import com.owncloud.android.authentication.AccountUtils;
 import com.owncloud.android.authentication.AuthenticatorActivity;
 import com.owncloud.android.datamodel.FileDataStorageManager;
 import com.owncloud.android.datamodel.OCFile;
+import com.owncloud.android.datamodel.ThumbnailsCacheManager;
 import com.owncloud.android.db.DbHandler;
 import com.owncloud.android.lib.common.OwnCloudAccount;
 import com.owncloud.android.lib.common.OwnCloudClient;
@@ -731,6 +732,10 @@ public class FileUploader extends Service
         
         mStorageManager.triggerMediaScan(file.getStoragePath());
 
+        // generate new Thumbnail
+        final ThumbnailsCacheManager.ThumbnailGenerationTask task =
+                new ThumbnailsCacheManager.ThumbnailGenerationTask(mStorageManager, mCurrentAccount);
+        task.execute(file);
     }
 
     private void updateOCFile(OCFile file, RemoteFile remoteFile) {