style: callback interface methods have become default methods

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) {}
 }

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) {}
 }

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) {}
 }

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) {}
 }

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() {}
 }

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() {}
 }

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) {}
 }

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) {}
 }