If no thumbnail exists, check if resized version exist and generate thumbnail out of it

Signed-off-by: tobiasKaminsky <tobias@kaminsky.me>

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

@@ -529,10 +529,16 @@ public class ThumbnailsCacheManager {
                     }
 
                 } else {
-                    // Download thumbnail from server
-                    OwnCloudVersion serverOCVersion = AccountUtils.getServerVersion(mAccount);
+                    // check if resized version is available
+                    String resizedImageKey = PREFIX_RESIZED_IMAGE + String.valueOf(file.getRemoteId());
+                    Bitmap resizedImage = getBitmapFromDiskCache(resizedImageKey);
 
-                    if (mClient != null) {
+                    if (resizedImage != null) {
+                        thumbnail = ThumbnailUtils.extractThumbnail(resizedImage, pxW, pxH);
+                    } else {
+                        //Download thumbnail from server
+                    OwnCloudVersion serverOCVersion = AccountUtils.getServerVersion(mAccount);
+                    if (mClient !=  null) {
                         if (serverOCVersion.supportsRemoteThumbnails()) {
                             getMethod = null;
                             try {
@@ -545,40 +551,40 @@ public class ThumbnailsCacheManager {
                                 getMethod.setRequestHeader("Cookie",
                                         "nc_sameSiteCookielax=true;nc_sameSiteCookiestrict=true");
 
-                                getMethod.setRequestHeader(RemoteOperation.OCS_API_HEADER,
-                                        RemoteOperation.OCS_API_HEADER_VALUE);
-
-                                int status = mClient.executeMethod(getMethod);
-                                if (status == HttpStatus.SC_OK) {
-                                    InputStream inputStream = getMethod.getResponseBodyAsStream();
-                                    Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
-                                    thumbnail = ThumbnailUtils.extractThumbnail(bitmap, pxW, pxH);
-                                } else {
-                                    mClient.exhaustResponse(getMethod.getResponseBodyAsStream());
-                                }
-
-                                // Handle PNG
-                                if (file.getMimetype().equalsIgnoreCase(PNG_MIMETYPE)) {
-                                    thumbnail = handlePNG(thumbnail, pxW, pxH);
-                                }
-
-                                // Add thumbnail to cache
-                                if (thumbnail != null) {
-                                    Log_OC.d(TAG, "add thumbnail to cache: " + file.getFileName());
-                                    addBitmapToCache(imageKey, thumbnail);
-                                }
-
-                            } catch (Exception e) {
-                                Log_OC.d(TAG, e.getMessage(), e);
-                            } finally {
-                                if (getMethod != null) {
-                                    getMethod.releaseConnection();
+                                    getMethod.setRequestHeader(RemoteOperation.OCS_API_HEADER,
+                                            RemoteOperation.OCS_API_HEADER_VALUE);
+
+                                    int status = mClient.executeMethod(getMethod);
+                                    if (status == HttpStatus.SC_OK) {
+                                        InputStream inputStream = getMethod.getResponseBodyAsStream();
+                                        Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
+                                        thumbnail = ThumbnailUtils.extractThumbnail(bitmap, pxW, pxH);
+                                    } else {
+                                        mClient.exhaustResponse(getMethod.getResponseBodyAsStream());
+                                    }
+
+                                    // Handle PNG
+                                    if (file.getMimetype().equalsIgnoreCase(PNG_MIMETYPE)) {
+                                        thumbnail = handlePNG(thumbnail, pxW, pxH);
+                                    }
+                                } catch (Exception e) {
+                                    Log_OC.d(TAG, e.getMessage(), e);
+                                } finally {
+                                    if (getMethod != null) {
+                                        getMethod.releaseConnection();
+                                    }
                                 }
+                            } else {
+                                Log_OC.d(TAG, "Server too old");
                             }
-                        } else {
-                            Log_OC.d(TAG, "Server too old");
                         }
                     }
+
+                    // Add thumbnail to cache
+                    if (thumbnail != null) {
+                        Log_OC.d(TAG, "add thumbnail to cache: " + file.getFileName());
+                        addBitmapToCache(imageKey, thumbnail);
+                    }
                 }
             }