diff --git a/app/src/main/java/com/cappielloantonio/tempo/interfaces/ClickCallback.java b/app/src/main/java/com/cappielloantonio/tempo/interfaces/ClickCallback.java
index 7fb70c26..281bcac7 100644
--- a/app/src/main/java/com/cappielloantonio/tempo/interfaces/ClickCallback.java
+++ b/app/src/main/java/com/cappielloantonio/tempo/interfaces/ClickCallback.java
@@ -3,46 +3,29 @@ package com.cappielloantonio.tempo.interfaces;
 
 import android.os.Bundle;
 
+import androidx.annotation.Keep;
+
+@Keep
 public interface ClickCallback {
     default void onMediaClick(Bundle bundle) {}
-
     default void onMediaLongClick(Bundle bundle) {}
-
     default void onAlbumClick(Bundle bundle) {}
-
     default void onAlbumLongClick(Bundle bundle) {}
-
     default void onArtistClick(Bundle bundle) {}
-
     default void onArtistLongClick(Bundle bundle) {}
-
     default void onGenreClick(Bundle bundle) {}
-
     default void onPlaylistClick(Bundle bundle) {}
-
     default void onPlaylistLongClick(Bundle bundle) {}
-
     default void onYearClick(Bundle bundle) {}
-
     default void onServerClick(Bundle bundle) {}
-
     default void onServerLongClick(Bundle bundle) {}
-
     default void onPodcastEpisodeClick(Bundle bundle) {}
-
     default void onPodcastEpisodeLongClick(Bundle bundle) {}
-
     default void onPodcastChannelClick(Bundle bundle) {}
-
     default void onPodcastChannelLongClick(Bundle bundle) {}
-
     default void onInternetRadioStationClick(Bundle bundle) {}
-
     default void onInternetRadioStationLongClick(Bundle bundle) {}
-
     default void onMusicFolderClick(Bundle bundle) {}
-
     default void onMusicDirectoryClick(Bundle bundle) {}
-
     default void onMusicIndexClick(Bundle bundle) {}
 }
diff --git a/app/src/main/java/com/cappielloantonio/tempo/interfaces/DecadesCallback.java b/app/src/main/java/com/cappielloantonio/tempo/interfaces/DecadesCallback.java
index 91a84f4d..531114e5 100644
--- a/app/src/main/java/com/cappielloantonio/tempo/interfaces/DecadesCallback.java
+++ b/app/src/main/java/com/cappielloantonio/tempo/interfaces/DecadesCallback.java
@@ -1,6 +1,8 @@
 package com.cappielloantonio.tempo.interfaces;
 
+import androidx.annotation.Keep;
 
+@Keep
 public interface DecadesCallback {
-    void onLoadYear(int year);
+    default void onLoadYear(int year) {}
 }
diff --git a/app/src/main/java/com/cappielloantonio/tempo/interfaces/MediaCallback.java b/app/src/main/java/com/cappielloantonio/tempo/interfaces/MediaCallback.java
index 5a7f40d2..23fb6c59 100644
--- a/app/src/main/java/com/cappielloantonio/tempo/interfaces/MediaCallback.java
+++ b/app/src/main/java/com/cappielloantonio/tempo/interfaces/MediaCallback.java
@@ -1,10 +1,11 @@
 package com.cappielloantonio.tempo.interfaces;
 
+import androidx.annotation.Keep;
+
 import java.util.List;
 
+@Keep
 public interface MediaCallback {
-
-    void onError(Exception exception);
-
-    void onLoadMedia(List<?> media);
+    default void onError(Exception exception) {}
+    default void onLoadMedia(List<?> media) {}
 }
diff --git a/app/src/main/java/com/cappielloantonio/tempo/interfaces/MediaIndexCallback.java b/app/src/main/java/com/cappielloantonio/tempo/interfaces/MediaIndexCallback.java
index e7f939a5..6a236e5f 100644
--- a/app/src/main/java/com/cappielloantonio/tempo/interfaces/MediaIndexCallback.java
+++ b/app/src/main/java/com/cappielloantonio/tempo/interfaces/MediaIndexCallback.java
@@ -1,5 +1,8 @@
 package com.cappielloantonio.tempo.interfaces;
 
+import androidx.annotation.Keep;
+
+@Keep
 public interface MediaIndexCallback {
-    void onRecovery(int index);
+    default void onRecovery(int index) {}
 }
diff --git a/app/src/main/java/com/cappielloantonio/tempo/interfaces/PodcastCallback.java b/app/src/main/java/com/cappielloantonio/tempo/interfaces/PodcastCallback.java
index 0e10a8a8..fde54e30 100644
--- a/app/src/main/java/com/cappielloantonio/tempo/interfaces/PodcastCallback.java
+++ b/app/src/main/java/com/cappielloantonio/tempo/interfaces/PodcastCallback.java
@@ -1,6 +1,9 @@
 package com.cappielloantonio.tempo.interfaces;
 
-public interface PodcastCallback {
+import androidx.annotation.Keep;
 
-    void onDismiss();
+@Keep
+
+public interface PodcastCallback {
+    default void onDismiss() {}
 }
diff --git a/app/src/main/java/com/cappielloantonio/tempo/interfaces/RadioCallback.java b/app/src/main/java/com/cappielloantonio/tempo/interfaces/RadioCallback.java
index 66a6c928..42bcea89 100644
--- a/app/src/main/java/com/cappielloantonio/tempo/interfaces/RadioCallback.java
+++ b/app/src/main/java/com/cappielloantonio/tempo/interfaces/RadioCallback.java
@@ -1,6 +1,9 @@
 package com.cappielloantonio.tempo.interfaces;
 
-public interface RadioCallback {
+import androidx.annotation.Keep;
 
-    void onDismiss();
+@Keep
+
+public interface RadioCallback {
+    default void onDismiss() {}
 }
diff --git a/app/src/main/java/com/cappielloantonio/tempo/interfaces/ScanCallback.java b/app/src/main/java/com/cappielloantonio/tempo/interfaces/ScanCallback.java
index 2612ce87..62607431 100644
--- a/app/src/main/java/com/cappielloantonio/tempo/interfaces/ScanCallback.java
+++ b/app/src/main/java/com/cappielloantonio/tempo/interfaces/ScanCallback.java
@@ -1,8 +1,9 @@
 package com.cappielloantonio.tempo.interfaces;
 
+import androidx.annotation.Keep;
+
+@Keep
 public interface ScanCallback {
-
-    void onError(Exception exception);
-
-    void onSuccess(boolean isScanning, long count);
+    default void onError(Exception exception) {}
+    default void onSuccess(boolean isScanning, long count) {}
 }
diff --git a/app/src/main/java/com/cappielloantonio/tempo/interfaces/SystemCallback.java b/app/src/main/java/com/cappielloantonio/tempo/interfaces/SystemCallback.java
index 996e6ed2..dc0b0088 100644
--- a/app/src/main/java/com/cappielloantonio/tempo/interfaces/SystemCallback.java
+++ b/app/src/main/java/com/cappielloantonio/tempo/interfaces/SystemCallback.java
@@ -1,8 +1,9 @@
 package com.cappielloantonio.tempo.interfaces;
 
+import androidx.annotation.Keep;
+
+@Keep
 public interface SystemCallback {
-
-    void onError(Exception exception);
-
-    void onSuccess(String password, String token, String salt);
+    default void onError(Exception exception) {}
+    default void onSuccess(String password, String token, String salt) {}
 }