Merge pull request #7333 from nextcloud/shimmer

Add shimmer to preview image fragment

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

@@ -42,7 +42,9 @@ import android.os.AsyncTask;
 import android.provider.MediaStore;
 import android.text.TextUtils;
 import android.view.Display;
+import android.view.View;
 import android.view.WindowManager;
+import android.widget.FrameLayout;
 import android.widget.ImageView;
 
 import com.nextcloud.client.network.ConnectivityService;
@@ -253,21 +255,27 @@ public final class ThumbnailsCacheManager {
         private FileDataStorageManager storageManager;
         private Account account;
         private WeakReference<ImageView> imageViewReference;
+        private WeakReference<FrameLayout> frameLayoutReference;
         private OCFile file;
         private ConnectivityService connectivityService;
+        private int backgroundColor;
 
 
         public ResizedImageGenerationTask(FileFragment fileFragment,
                                           ImageView imageView,
+                                          FrameLayout emptyListProgress,
                                           FileDataStorageManager storageManager,
                                           ConnectivityService connectivityService,
-                                          Account account)
+                                          Account account,
+                                          int backgroundColor)
                 throws IllegalArgumentException {
             this.fileFragment = fileFragment;
             imageViewReference = new WeakReference<>(imageView);
+            frameLayoutReference = new WeakReference<>(emptyListProgress);
             this.storageManager = storageManager;
             this.connectivityService = connectivityService;
             this.account = account;
+            this.backgroundColor = backgroundColor;
         }
 
         @Override
@@ -280,7 +288,7 @@ public final class ThumbnailsCacheManager {
                 if (account != null) {
                     OwnCloudAccount ocAccount = new OwnCloudAccount(account, MainApp.getAppContext());
                     mClient = OwnCloudClientManagerFactory.getDefaultSingleton().getClientFor(ocAccount,
-                            MainApp.getAppContext());
+                                                                                              MainApp.getAppContext());
                 }
 
                 thumbnail = doResizedImageInBackground();
@@ -375,6 +383,7 @@ public final class ThumbnailsCacheManager {
         protected void onPostExecute(Bitmap bitmap) {
             if (imageViewReference != null) {
                 final ImageView imageView = imageViewReference.get();
+                final FrameLayout frameLayout = frameLayoutReference.get();
 
                 if (bitmap != null) {
                     final ResizedImageGenerationTask bitmapWorkerTask = getResizedImageGenerationWorkerTask(imageView);
@@ -383,7 +392,13 @@ public final class ThumbnailsCacheManager {
                         String tagId = String.valueOf(file.getFileId());
 
                         if (String.valueOf(imageView.getTag()).equals(tagId)) {
+                            imageView.setVisibility(View.VISIBLE);
                             imageView.setImageBitmap(bitmap);
+                            imageView.setBackgroundColor(backgroundColor);
+
+                            if (frameLayout != null) {
+                                frameLayout.setVisibility(View.GONE);
+                            }
                         }
                     }
                 } else {

src/main/java/com/owncloud/android/ui/activity/ToolbarActivity.java

@@ -270,4 +270,8 @@ public abstract class ToolbarActivity extends BaseActivity {
     public ImageView getPreviewImageView() {
         return mPreviewImage;
     }
+
+    public FrameLayout getPreviewImageContainer() {
+        return mPreviewImageContainer;
+    }
 }

src/main/java/com/owncloud/android/ui/adapter/DiskLruImageCache.java

@@ -128,7 +128,11 @@ public class DiskLruImageCache {
                 options.inMutable = false;
                 options.inJustDecodeBounds = true;
 
-                bitmap = BitmapFactory.decodeStream(buffIn, null, options);
+                BitmapFactory.decodeStream(buffIn, null, options);
+
+                snapshot = mDiskCache.get(validKey);
+                inputStream = snapshot.getInputStream(0);
+                buffIn = new BufferedInputStream(inputStream, IO_BUFFER_SIZE);
 
                 // Calculate inSampleSize
                 options.inSampleSize = BitmapUtils.calculateSampleFactor(options, width, height);

src/main/java/com/owncloud/android/ui/fragment/FileDetailFragment.java

@@ -579,11 +579,14 @@ public class FileDetailFragment extends FileFragment implements OnClickListener,
                 if (ThumbnailsCacheManager.cancelPotentialThumbnailWork(getFile(), toolbarActivity.getPreviewImageView()) &&
                         containerActivity.getStorageManager() != null) {
                     final ThumbnailsCacheManager.ResizedImageGenerationTask task =
-                            new ThumbnailsCacheManager.ResizedImageGenerationTask(this,
-                                                                                  toolbarActivity.getPreviewImageView(),
-                                                                                  containerActivity.getStorageManager(),
-                                                                                  connectivityService,
-                                                                                  containerActivity.getStorageManager().getAccount());
+                        new ThumbnailsCacheManager.ResizedImageGenerationTask(this,
+                                                                              toolbarActivity.getPreviewImageView(),
+                                                                              toolbarActivity.getPreviewImageContainer(),
+                                                                              containerActivity.getStorageManager(),
+                                                                              connectivityService,
+                                                                              containerActivity.getStorageManager().getAccount(),
+                                                                              getResources().getColor(R.color.background_color_inverse)
+                        );
 
                     if (resizedImage == null) {
                         resizedImage = thumbnail;

src/main/java/com/owncloud/android/ui/preview/PreviewImageFragment.java

@@ -89,6 +89,8 @@ import androidx.fragment.app.FragmentStatePagerAdapter;
 import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
 import pl.droidsonroids.gif.GifDrawable;
 
+import static com.owncloud.android.datamodel.ThumbnailsCacheManager.PREFIX_THUMBNAIL;
+
 
 /**
  * This fragment shows a preview of a downloaded image.
@@ -237,34 +239,44 @@ public class PreviewImageFragment extends FileFragment implements Injectable {
             int width = screenSize.x;
             int height = screenSize.y;
 
+            // show thumbnail while loading image
+            binding.image.setVisibility(View.GONE);
+            binding.emptyListProgress.setVisibility(View.VISIBLE);
+
+            Bitmap thumbnail = getThumbnailBitmap(getFile());
+            if (thumbnail != null) {
+                binding.shimmer.setVisibility(View.VISIBLE);
+                binding.shimmerThumbnail.setImageBitmap(thumbnail);
+                binding.image.setVisibility(View.GONE);
+                bitmap = thumbnail;
+            } else {
+                thumbnail = ThumbnailsCacheManager.mDefaultImg;
+            }
+
             if (showResizedImage) {
                 Bitmap resizedImage = getResizedBitmap(getFile(), width, height);
 
                 if (resizedImage != null && !getFile().isUpdateThumbnailNeeded()) {
                     binding.image.setImageBitmap(resizedImage);
                     binding.image.setVisibility(View.VISIBLE);
+                    binding.emptyListView.setVisibility(View.GONE);
+                    binding.emptyListProgress.setVisibility(View.GONE);
+                    binding.image.setBackgroundColor(getResources().getColor(R.color.background_color_inverse));
+
                     bitmap = resizedImage;
                 } else {
-                    // show thumbnail while loading resized image
-                    Bitmap thumbnail = getResizedBitmap(getFile(), width, height);
-
-                    if (thumbnail != null) {
-                        binding.image.setImageBitmap(thumbnail);
-                        binding.image.setVisibility(View.VISIBLE);
-                        bitmap = thumbnail;
-                    } else {
-                        thumbnail = ThumbnailsCacheManager.mDefaultImg;
-                    }
-
                     // generate new resized image
                     if (ThumbnailsCacheManager.cancelPotentialThumbnailWork(getFile(), binding.image) &&
                         containerActivity.getStorageManager() != null) {
                         final ThumbnailsCacheManager.ResizedImageGenerationTask task =
                             new ThumbnailsCacheManager.ResizedImageGenerationTask(this,
                                                                                   binding.image,
+                                                                                  binding.emptyListProgress,
                                                                                   containerActivity.getStorageManager(),
                                                                                   connectivityService,
-                                                                                  containerActivity.getStorageManager().getAccount());
+                                                                                  containerActivity.getStorageManager().getAccount(),
+                                                                                  getResources().getColor(R.color.background_color_inverse)
+                            );
                         if (resizedImage == null) {
                             resizedImage = thumbnail;
                         }
@@ -278,11 +290,6 @@ public class PreviewImageFragment extends FileFragment implements Injectable {
                         task.execute(getFile());
                     }
                 }
-                binding.emptyListView.setVisibility(View.GONE);
-                binding.emptyListProgress.setVisibility(View.GONE);
-                binding.image.setBackgroundColor(getResources().getColor(R.color.background_color_inverse));
-                binding.image.setVisibility(View.VISIBLE);
-
             } else {
                 loadBitmapTask = new LoadBitmapTask(binding.image, binding.emptyListView, binding.emptyListProgress);
                 binding.image.setVisibility(View.GONE);
@@ -316,6 +323,11 @@ public class PreviewImageFragment extends FileFragment implements Injectable {
         return cachedImage;
     }
 
+    private @Nullable
+    Bitmap getThumbnailBitmap(OCFile file) {
+        return ThumbnailsCacheManager.getBitmapFromDiskCache(PREFIX_THUMBNAIL + file.getRemoteId());
+    }
+
     @Override
     public void onStop() {
         Log_OC.d(TAG, "onStop starts");

src/main/res/layout/preview_image_fragment.xml

@@ -89,19 +89,20 @@
         android:layout_height="match_parent">
 
         <com.elyeproj.loaderviewlibrary.LoaderImageView
-            android:layout_width="@dimen/empty_list_icon_layout_width"
-            android:layout_height="@dimen/empty_list_icon_layout_width"
+            android:id="@+id/shimmer"
+            android:layout_width="96dp"
+            android:layout_height="96dp"
             android:layout_gravity="center"
             android:contentDescription="@null"
             app:corners="24" />
 
         <ImageView
+            android:id="@+id/shimmerThumbnail"
             android:layout_width="@dimen/empty_list_icon_layout_width"
             android:layout_height="@dimen/empty_list_icon_layout_height"
             android:layout_gravity="center"
             android:contentDescription="@null"
-            android:src="@drawable/ic_image_outline"
-            app:tint="@color/bg_default" />
+            android:src="@drawable/ic_image_outline" />
 
     </FrameLayout>
 </FrameLayout>

src/main/res/layout/toolbar_standard.xml

@@ -91,6 +91,8 @@
                 android:layout_height="@dimen/nav_drawer_header_height"
                 android:visibility="gone">
 
+                <!--                TODO add shimmer -->
+
                 <ImageView
                     android:id="@+id/preview_image"
                     android:layout_width="match_parent"