Convert SavedState to Kotlin and use the Parcelize annotation.

app/src/main/java/org/schabi/newpipe/fragments/list/BaseListFragment.java

@@ -48,7 +48,7 @@ public abstract class BaseListFragment<I, N> extends BaseStateFragment<I>
         implements ListViewContract<I, N>, StateSaver.WriteRead,
         SharedPreferences.OnSharedPreferenceChangeListener {
     private static final int LIST_MODE_UPDATE_FLAG = 0x32;
-    protected StateSaver.SavedState savedState;
+    protected org.schabi.newpipe.util.SavedState savedState;
 
     private boolean useDefaultStateSaving = true;
     private int updateFlags = 0;

app/src/main/java/org/schabi/newpipe/local/dialog/PlaylistDialog.java

@@ -17,7 +17,7 @@ import java.util.Queue;
 public abstract class PlaylistDialog extends DialogFragment implements StateSaver.WriteRead {
     private List<StreamEntity> streamEntities;
 
-    private StateSaver.SavedState savedState;
+    private org.schabi.newpipe.util.SavedState savedState;
 
     protected void setInfo(final List<StreamEntity> entities) {
         this.streamEntities = entities;

app/src/main/java/org/schabi/newpipe/util/SavedState.kt

@@ -0,0 +1,25 @@
+package org.schabi.newpipe.util
+
+import android.os.Parcelable
+import kotlinx.android.parcel.Parcelize
+
+/**
+ * Information about the saved state on the disk.
+ */
+@Parcelize
+class SavedState(
+    /**
+     * Get the prefix of the saved file.
+     *
+     * @return the file prefix
+     */
+    val prefixFileSaved: String,
+    /**
+     * Get the path to the saved file.
+     *
+     * @return the path to the saved file
+     */
+    val pathFileSaved: String
+) : Parcelable {
+    override fun toString() = "$prefixFileSaved > $pathFileSaved"
+}

app/src/main/java/org/schabi/newpipe/util/StateSaver.java

@@ -22,8 +22,6 @@ package org.schabi.newpipe.util;
 
 import android.content.Context;
 import android.os.Bundle;
-import android.os.Parcel;
-import android.os.Parcelable;
 import android.text.TextUtils;
 import android.util.Log;
 
@@ -288,7 +286,7 @@ public final class StateSaver {
             Log.d(TAG, "onDestroy() called with: savedState = [" + savedState + "]");
         }
 
-        if (savedState != null && !TextUtils.isEmpty(savedState.getPathFileSaved())) {
+        if (savedState != null && !savedState.getPathFileSaved().isEmpty()) {
             STATE_OBJECTS_HOLDER.remove(savedState.getPrefixFileSaved());
             try {
                 //noinspection ResultOfMethodCallIgnored
@@ -348,75 +346,4 @@ public final class StateSaver {
          */
         void readFrom(@NonNull Queue<Object> savedObjects) throws Exception;
     }
-
-    /*//////////////////////////////////////////////////////////////////////////
-    // Inner
-    //////////////////////////////////////////////////////////////////////////*/
-
-    /**
-     * Information about the saved state on the disk.
-     */
-    public static class SavedState implements Parcelable {
-        @SuppressWarnings("unused")
-        public static final Parcelable.Creator<SavedState> CREATOR
-                = new Parcelable.Creator<SavedState>() {
-            @Override
-            public SavedState createFromParcel(final Parcel in) {
-                return new SavedState(in);
-            }
-
-            @Override
-            public SavedState[] newArray(final int size) {
-                return new SavedState[size];
-            }
-        };
-        private final String prefixFileSaved;
-        private final String pathFileSaved;
-
-        public SavedState(final String prefixFileSaved, final String pathFileSaved) {
-            this.prefixFileSaved = prefixFileSaved;
-            this.pathFileSaved = pathFileSaved;
-        }
-
-        protected SavedState(final Parcel in) {
-            prefixFileSaved = in.readString();
-            pathFileSaved = in.readString();
-        }
-
-        @Override
-        public String toString() {
-            return getPrefixFileSaved() + " > " + getPathFileSaved();
-        }
-
-        @Override
-        public int describeContents() {
-            return 0;
-        }
-
-        @Override
-        public void writeToParcel(final Parcel dest, final int flags) {
-            dest.writeString(prefixFileSaved);
-            dest.writeString(pathFileSaved);
-        }
-
-        /**
-         * Get the prefix of the saved file.
-         *
-         * @return the file prefix
-         */
-        public String getPrefixFileSaved() {
-            return prefixFileSaved;
-        }
-
-        /**
-         * Get the path to the saved file.
-         *
-         * @return the path to the saved file
-         */
-        public String getPathFileSaved() {
-            return pathFileSaved;
-        }
-    }
-
-
 }