added own gif viewer implementation

app/build.gradle

@@ -64,7 +64,6 @@ dependencies {
 	//noinspection GradleDependency
 	implementation 'com.squareup.picasso:picasso:2.8'
 	implementation 'jp.wasabeef:picasso-transformations:2.4.0'
-	implementation 'pl.droidsonroids.gif:android-gif-drawable:1.2.25'
 	implementation 'com.github.QuadFlask:colorpicker:0.0.15'
 	implementation 'com.github.nuclearfog:ZoomView:1.0.4'
 	implementation 'com.github.nuclearfog:Tagger:2.4'

app/proguard-rules.pro

@@ -37,8 +37,6 @@
 -dontwarn org.openjsse.net.ssl.OpenJSSE
 -keep,allowobfuscation, allowoptimization class org.openjsse.net.ssl.OpenJSSE {*;}
 
--keep class pl.droidsonroids.gif.** {*;}
-
 -dontwarn javax.annotation.Nullable
 
 -keepclassmembers class * implements android.os.Parcelable {*;}

app/src/main/assets/licenses.html

@@ -181,40 +181,6 @@
             limitations under the License.
         </pre>
 
-        <h3>Notices for libraries:</h3>
-        <ul>
-            <li>android-gif-drawable </li>
-        </ul>
-        <pre>
-            MIT License
-            Copyright (c) 2016 Karol Wrótniak,
-            Droids on Roids
-
-            Permission is hereby granted, free of charge,
-            to any person obtaining a copy of this software
-            and associated documentation files (the "Software"),
-            to deal in the Software without restriction,
-            including without limitation the rights
-            to use, copy, modify, merge, publish, distribute,
-            sublicense, and/or sell copies of the Software,
-            and to permit persons to whom the Software is
-            furnished to do so, subject to the following conditions:
-
-            The above copyright notice and this permission
-            notice shall be included in all copies or
-            substantial portions of the Software.
-
-            THE SOFTWARE IS PROVIDED "AS IS",
-            WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
-            INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-            FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
-            IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
-            BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
-            WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
-            ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
-            OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-        </pre>
-
     </body>
 
 </html>

app/src/main/java/org/nuclearfog/twidda/ui/activities/ImageViewer.java

@@ -21,11 +21,11 @@ import org.nuclearfog.twidda.backend.async.ImageLoader.ImageResult;
 import org.nuclearfog.twidda.backend.utils.AppStyles;
 import org.nuclearfog.twidda.backend.utils.ErrorHandler;
 import org.nuclearfog.twidda.config.GlobalSettings;
+import org.nuclearfog.twidda.ui.views.AnimatedImageView;
 import org.nuclearfog.zoomview.ZoomView;
 
 import java.io.File;
 
-import pl.droidsonroids.gif.GifImageView;
 
 /**
  * Activity to show online and local images
@@ -63,7 +63,7 @@ public class ImageViewer extends MediaActivity implements AsyncCallback<ImageRes
 	private static final String CACHE_FOLDER = "imagecache";
 
 	private ZoomView zoomImage;
-	private GifImageView gifImage;
+	private AnimatedImageView gifImage;
 	private ProgressBar loadingCircle;
 
 	@Nullable

app/src/main/java/org/nuclearfog/twidda/ui/views/AnimatedImageView.java

@@ -0,0 +1,95 @@
+package org.nuclearfog.twidda.ui.views;
+
+import android.content.ContentResolver;
+import android.content.Context;
+import android.graphics.Canvas;
+import android.graphics.Movie;
+import android.net.Uri;
+import android.util.AttributeSet;
+import androidx.appcompat.widget.AppCompatImageView;
+
+import androidx.annotation.Nullable;
+
+import java.io.FileNotFoundException;
+import java.io.InputStream;
+
+/**
+ * custom {@link android.widget.ImageView} implementation to support animated images
+ *
+ * @author nuclearfog
+ */
+public class AnimatedImageView extends AppCompatImageView {
+
+	/**
+	 * image upscale limitation
+	 */
+	private static final float MAX_SCALE = 10.0f;
+
+	private Movie movie;
+	private float xOffset, yOffset;
+	private float scale = 0.0f;
+	private long moviestart = 0;
+
+	/**
+	 * @inheritDoc
+	 */
+	public AnimatedImageView(Context context) {
+		this(context, null);
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public AnimatedImageView(Context context, @Nullable AttributeSet attrs) {
+		super(context, attrs);
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	@Override
+	public void setImageURI(@Nullable Uri uri) {
+		ContentResolver resolver =  getContext().getContentResolver();
+		String mime = resolver.getType(uri);
+		if (mime != null && mime.contains("gif")) {
+			try {
+				InputStream is = resolver.openInputStream(uri);
+				movie = Movie.decodeStream(is);
+			} catch (FileNotFoundException e) {
+				// ignore, use static image
+			}
+		}
+		super.setImageURI(uri);
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	@Override
+	protected void onDraw(Canvas canvas) {
+		if (movie != null) {
+			// calculate scale and offsets
+			if (scale == 0.0f && movie.height() > 0 && movie.width() > 0) {
+				scale = Math.min((float) getMeasuredHeight() / (float) movie.height(), (float) getMeasuredWidth() / (float) movie.width());
+				scale = Math.min(scale, MAX_SCALE);
+				if (scale > 0.0) {
+					xOffset = ((float) getWidth() / scale - (float) movie.width()) / 2.0f;
+					yOffset = ((float) getHeight() / scale - (float) movie.height()) / 2.0f;
+				}
+			}
+			long now = System.currentTimeMillis();
+			if (moviestart == 0)
+				moviestart = now;
+			// set relative time
+			movie.setTime((int) ((now - moviestart) % movie.duration()));
+			// scale, translate and draw canvas
+			if (scale != 0.0f)
+				canvas.scale(scale, scale);
+			movie.draw(canvas, xOffset, yOffset);
+			// trigger next drawing
+			invalidate();
+		} else {
+			super.onDraw(canvas);
+		}
+	}
+}

app/src/main/res/layout/page_image.xml

@@ -29,7 +29,7 @@
 		app:max_zoom_in="10.0"
 		app:max_zoom_out="0.5" />
 
-	<pl.droidsonroids.gif.GifImageView
+	<org.nuclearfog.twidda.ui.views.AnimatedImageView
 		android:id="@+id/page_image_gif"
 		android:layout_width="match_parent"
 		android:layout_height="match_parent"