added a function that generates pseudo-random numbers that change every x hours

app/src/main/java/com/cappielloantonio/play/ui/fragment/HomeFragment.java

@@ -1,6 +1,7 @@
 package com.cappielloantonio.play.ui.fragment;
 
 import android.os.Bundle;
+import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -24,6 +25,7 @@ import com.cappielloantonio.play.adapter.YearAdapter;
 import com.cappielloantonio.play.databinding.FragmentHomeBinding;
 import com.cappielloantonio.play.model.Song;
 import com.cappielloantonio.play.ui.activities.MainActivity;
+import com.cappielloantonio.play.util.MusicUtil;
 import com.cappielloantonio.play.util.PreferenceUtil;
 import com.cappielloantonio.play.viewmodel.HomeViewModel;
 
@@ -113,6 +115,8 @@ public class HomeFragment extends Fragment {
         bind.discoverSongViewPager.setAdapter(discoverSongAdapter);
         bind.discoverSongViewPager.setOffscreenPageLimit(3);
         setDiscoverSongSlideViewOffset(20, 16);
+
+        Log.i(TAG, "initDiscoverSongSlideView: " + MusicUtil.getRandomSongNumber(requireContext(), 10, 3));
     }
 
     private void initMostPlayedSongView() {

app/src/main/java/com/cappielloantonio/play/ui/fragment/SyncFragment.java

@@ -204,6 +204,7 @@ public class SyncFragment extends Fragment {
                 songRepository.deleteAllSongGenreCross();
                 songRepository.insertAll((ArrayList<Song>) media);
                 syncSongArtistCross((ArrayList<Song>) media);
+                PreferenceUtil.getInstance(requireContext()).setSongNumber(media.size());
                 animateProgressBar(true);
             }
         });

app/src/main/java/com/cappielloantonio/play/util/MusicUtil.java

@@ -1,5 +1,6 @@
 package com.cappielloantonio.play.util;
 
+import android.content.Context;
 import android.util.Log;
 
 import com.cappielloantonio.play.App;
@@ -10,7 +11,10 @@ import com.cappielloantonio.play.model.Song;
 
 import org.jellyfin.apiclient.interaction.ApiClient;
 
+import java.util.ArrayList;
+import java.util.List;
 import java.util.Locale;
+import java.util.Random;
 
 public class MusicUtil {
     public static String getSongFileUri(Song song) {
@@ -86,4 +90,23 @@ public class MusicUtil {
             return R.drawable.default_album_art;
         }
     }
+
+    public static List<Integer> getRandomSongNumber(Context context, int numberOfNumbers, int refreshAfterXHours) {
+        List<Integer> list = new ArrayList<>();
+
+        for (int i = 0; i < numberOfNumbers; i++)
+        {
+            list.add(getRandomNumber(0, PreferenceUtil.getInstance(context).getSongNumber(), getMidnightTimestamp(System.currentTimeMillis() / 1000, refreshAfterXHours) + i));
+        }
+
+        return list;
+    }
+
+    private static long getMidnightTimestamp(long timestamp, int hours) {
+        return timestamp - timestamp % (hours * 60 * 60); // 24 * 60 * 60 sec in one day
+    }
+
+    private static int getRandomNumber(int min, int max, long seed) {
+        return new Random(seed).nextInt((max - min) + 1) + min;
+    }
 }

app/src/main/java/com/cappielloantonio/play/util/PreferenceUtil.java

@@ -34,6 +34,8 @@ public class PreferenceUtil {
     public static final String MAXIMUM_BITRATE = "maximum_bitrate";
     public static final String AUDIO_DUCKING = "audio_ducking";
 
+    public static final String SONG_NUMBER = "SONG_NUMBER";
+
     private static PreferenceUtil sInstance;
     private final SharedPreferences mPreferences;
 
@@ -175,4 +177,14 @@ public class PreferenceUtil {
     public final boolean getAudioDucking() {
         return mPreferences.getBoolean(AUDIO_DUCKING, true);
     }
+
+    public int getSongNumber() {
+        return mPreferences.getInt(SONG_NUMBER, 0);
+    }
+
+    public void setSongNumber(int number) {
+        final SharedPreferences.Editor editor = mPreferences.edit();
+        editor.putInt(SONG_NUMBER, number);
+        editor.apply();
+    }
 }