Enable crosswiki notifications and minor UI fixes in displaying notif… (#1540)

* Enable crosswiki notifications and minor UI fixes in displaying notifications

* Added java docs

app/src/main/java/fr/free/nrw/commons/glide/SvgDecoder.java

@@ -0,0 +1,36 @@
+package fr.free.nrw.commons.glide;
+
+import android.support.annotation.NonNull;
+
+import com.bumptech.glide.load.Options;
+import com.bumptech.glide.load.ResourceDecoder;
+import com.bumptech.glide.load.engine.Resource;
+import com.bumptech.glide.load.resource.SimpleResource;
+import com.caverock.androidsvg.SVG;
+import com.caverock.androidsvg.SVGParseException;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+/**
+ * Decodes an SVG internal representation from an {@link InputStream}.
+ */
+public class SvgDecoder implements ResourceDecoder<InputStream, SVG> {
+
+    @Override
+    public boolean handles(@NonNull InputStream source, @NonNull Options options) {
+        // TODO: Can we tell?
+        return true;
+    }
+
+    public Resource<SVG> decode(@NonNull InputStream source, int width, int height,
+                                @NonNull Options options)
+            throws IOException {
+        try {
+            SVG svg = SVG.getFromInputStream(source);
+            return new SimpleResource<>(svg);
+        } catch (SVGParseException ex) {
+            throw new IOException("Cannot load SVG from stream", ex);
+        }
+    }
+}

app/src/main/java/fr/free/nrw/commons/glide/SvgDrawableTranscoder.java

@@ -0,0 +1,28 @@
+package fr.free.nrw.commons.glide;
+
+import android.graphics.Picture;
+import android.graphics.drawable.PictureDrawable;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+
+import com.bumptech.glide.load.Options;
+import com.bumptech.glide.load.engine.Resource;
+import com.bumptech.glide.load.resource.SimpleResource;
+import com.bumptech.glide.load.resource.transcode.ResourceTranscoder;
+import com.caverock.androidsvg.SVG;
+
+/**
+ * Convert the {@link SVG}'s internal representation to an Android-compatible one
+ * ({@link Picture}).
+ */
+public class SvgDrawableTranscoder implements ResourceTranscoder<SVG, PictureDrawable> {
+    @Nullable
+    @Override
+    public Resource<PictureDrawable> transcode(@NonNull Resource<SVG> toTranscode,
+                                               @NonNull Options options) {
+        SVG svg = toTranscode.get();
+        Picture picture = svg.renderToPicture();
+        PictureDrawable drawable = new PictureDrawable(picture);
+        return new SimpleResource<>(drawable);
+    }
+}

app/src/main/java/fr/free/nrw/commons/glide/SvgSoftwareLayerSetter.java

@@ -0,0 +1,51 @@
+package fr.free.nrw.commons.glide;
+
+import android.graphics.drawable.PictureDrawable;
+import android.widget.ImageView;
+
+import com.bumptech.glide.load.DataSource;
+import com.bumptech.glide.load.engine.GlideException;
+import com.bumptech.glide.request.RequestListener;
+import com.bumptech.glide.request.target.ImageViewTarget;
+import com.bumptech.glide.request.target.Target;
+
+/**
+ * Listener which updates the {@link ImageView} to be software rendered, because
+ * {@link com.caverock.androidsvg.SVG SVG}/{@link android.graphics.Picture Picture} can't render on
+ * a hardware backed {@link android.graphics.Canvas Canvas}.
+ */
+public class SvgSoftwareLayerSetter implements RequestListener<PictureDrawable> {
+
+    /**
+     * Sets the layer type to none if the load fails
+     * @param e
+     * @param model
+     * @param target
+     * @param isFirstResource
+     * @return
+     */
+    @Override
+    public boolean onLoadFailed(GlideException e, Object model, Target<PictureDrawable> target,
+                                boolean isFirstResource) {
+        ImageView view = ((ImageViewTarget<?>) target).getView();
+        view.setLayerType(ImageView.LAYER_TYPE_NONE, null);
+        return false;
+    }
+
+    /**
+     * Sets the layer type to software when the resource is ready
+     * @param resource
+     * @param model
+     * @param target
+     * @param dataSource
+     * @param isFirstResource
+     * @return
+     */
+    @Override
+    public boolean onResourceReady(PictureDrawable resource, Object model,
+                                   Target<PictureDrawable> target, DataSource dataSource, boolean isFirstResource) {
+        ImageView view = ((ImageViewTarget<?>) target).getView();
+        view.setLayerType(ImageView.LAYER_TYPE_SOFTWARE, null);
+        return false;
+    }
+}