How do I possibly create favorite list as I store & retrieve data in string using CData

Question

In my own effort, I used SharedPreference to create memory for my savings. But I don't know how to finish it up and make it workable. I have already gone far and have saved my data in string using CData. But my app users insisted I should put favorite list where they can save lists of songs of their choices. I made my app using ListView with Adapter and when clicked opens the full detail of the song list in a new activity. I'm trying to create a favorite where a user has the option to click on favorite icon and save a list of song in the favorite list. In that same favorite list the user needs an option to either keep or delete the item from the favorite list.

This below is what I have been able to do that yielded no positive result. I don't know what to do next.

SharedPreference

public class PreferenceUtils {
    private static final PreferenceUtils ourInstance = new PreferenceUtils();
    private static SharedPreferences sharedPreferences;
    private static Context context;

    private static String APP_DATA_NAME = "SONGS";

    static PreferenceUtils getInstance() {
        return ourInstance;
    }

    private PreferenceUtils() {
    }

    public static void initialize(Context c) {
        sharedPreferences = c.getSharedPreferences(APP_DATA_NAME, Context.MODE_PRIVATE);
        context = c;
    }

    public static String getPreference(String key, String defaultValue) {
        if (sharedPreferences == null) return null;
        return sharedPreferences.getString(key, defaultValue);
    }

    public static boolean getPreference(String key, boolean defaultValue) {
        if (sharedPreferences == null) return false;
        return sharedPreferences.getBoolean(key, defaultValue);
    }

    public static Set<String> getPreference(String key) {
        if (sharedPreferences == null) return null;
        return sharedPreferences.getStringSet(key,null);
    }

    public static void setPreference(String key, String value) {
        if (sharedPreferences == null) return;
        SharedPreferences.Editor editor = sharedPreferences.edit();
        editor.putString(key, value);
        editor.commit();
    }

    public static void setPreference(String key, boolean value) {
        if (sharedPreferences == null) return;
        SharedPreferences.Editor editor = sharedPreferences.edit();
        editor.putBoolean(key, value);
        editor.commit();
    }
    public static void setPreference(String key, Set<String> value) {
        if (sharedPreferences == null) return;
        SharedPreferences.Editor editor = sharedPreferences.edit();
        editor.putStringSet(key, value);
        editor.apply();
    }

}

Item_row

<?xml version="1.0" encoding="utf-8"?>
    <androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        app:cardCornerRadius="7dp"
        app:cardElevation="4dp"
        android:background="#F4F4F7"
        app:cardUseCompatPadding="true">


        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:padding="16dp">

            <ImageView
                android:layout_width="40dp"
                android:layout_height="40dp"
                android:id="@+id/imageIv"
                android:src="@drawable/cpu"/>

            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:id="@+id/titleTv"
                android:text="Title"
                android:textSize="17sp"
                android:textColor="#000000"
                android:fontFamily="sans-serif-condensed"
                android:layout_toRightOf="@id/imageIv"
                android:layout_toEndOf="@id/imageIv"
                android:layout_marginLeft="10dp"
                android:layout_marginStart="10dp" />

            <TextView
                android:id="@+id/descriptionTv"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_below="@id/titleTv"
                android:layout_marginLeft="10dp"
                android:layout_marginTop="5dp"
                android:layout_toEndOf="@id/imageIv"
                android:layout_toRightOf="@id/imageIv"
                android:text="descriptionTv"
                android:textColor="#DF014C"
                android:textSize="11sp"
                android:textStyle="italic" />
            
            <ImageView
                android:id="@+id/fav"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentRight="true"
                android:padding="2dp"
                android:src="@drawable/ic_star_outline"/>

        </RelativeLayout>

    </androidx.cardview.widget.CardView>

MyHolder

public class MyHolder1 extends RecyclerView.ViewHolder implements View.OnClickListener {

    ImageView mImageView;
    TextView mTitle, mDesc;
    ItemClickListener1 itemCLickListener;



    MyHolder1(@NonNull View itemView) {
        super(itemView);

        this.mImageView = itemView.findViewById(R.id.imageIv);
        this.mTitle = itemView.findViewById(R.id.titleTv);
        this.mDesc = itemView.findViewById(R.id.descriptionTv);

        itemView.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {

        this.itemCLickListener.onItemClickListener(v, getLayoutPosition());

    }

    public void setItemCLickListener(ItemClickListener1 ic){
        this.itemCLickListener = ic;
    }
}

MyAdapter1

public class MyAdapter1 extends RecyclerView.Adapter<MyHolder1> implements Filterable {

    Context mContext;
    ArrayList<Model1> models, filterList;  // this array list create a list of array which parameter define in our class
    CustomFilter1 filter;


    public MyAdapter1(Context context, ArrayList<Model1> models) {
        this.mContext = context;
        this.models = models;
        this.filterList = models;
    }

    @NonNull
    @Override
    public MyHolder1 onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {

        View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.row1, null); //this line inflate our row


        return new MyHolder1(view); //this will return our view to holder class
    }

    @Override
    public void onBindViewHolder(@NonNull final MyHolder1 myHolder, int i) {

        myHolder.mTitle.setText(models.get(i).getTitle()); //here is position
        myHolder.mDesc.setText(models.get(i).getDesc());
        myHolder.mImageView.setImageResource(models.get(i).getIcon()); // here we used imge resource

        myHolder.setItemCLickListener(new ItemClickListener1() {
            @Override
            public void onItemClickListener(View v, int position) {

                String gTitle = models.get(position).getTitle();
                String gDesc = models.get(position).getDesc();
                BitmapDrawable bitmapDrawable = (BitmapDrawable)myHolder.mImageView.getDrawable();
                Bitmap bitmap = bitmapDrawable.getBitmap();

                ByteArrayOutputStream stream = new ByteArrayOutputStream();
                bitmap.compress(Bitmap.CompressFormat.PNG, 100, stream);
                byte[] bytes = stream.toByteArray();

                //get our data with intent
                Intent intent = new Intent(mContext, NewActivity1.class);
                intent.putExtra("actionBarTitle", models.get(position).getTitle());
                intent.putExtra("brandNewDesc", models.get(position).getBrandNewDesc());
                intent.putExtra("iImage", bytes);
                mContext.startActivity(intent);
                return;
            }
        });

    }

    @Override
    public int getItemCount() {
        return models.size();
    }

    @Override
    public Filter getFilter() {

        if (filter == null){
            filter = new CustomFilter1(filterList, this);
        }

        return filter;
    }
}

Modal Class

public class Model1 {

    private String title, description, desc;
    private int icon;
    String brandNewDesc;

    //constructor
    public Model1(String title, String desc, String description, int icon) {
        this.title = title;
        this.desc = desc;
        this.icon = icon;
        this.brandNewDesc = description;
    }

    //getters


    public String getTitle() {
        return title;
    }

    public String getDesc() {
        return desc;
    }

    public String getBrandNewDesc() {

        return brandNewDesc;
    }

    public int getIcon() {
        return icon;
    }

}

Example of data saved in String.xml

 <string-array name="array_titles_1">
        Mothering Sunday Wishes For my Mom

        <item>"<![CDATA[I love my trip on trip track one]]>"</item>
        <item>"<![CDATA[Back to my lover track two]]>"</item>
        


    </string-array>


    <string-array name="array_lyrics_1">
        <item>"<![CDATA[description of song genre and sources]]>"</item>
        <item>"<![CDATA[description of song genre and sources]]>"</item>


    </string-array>


    <string-array name="newbrandDesc_1">
        <item>"<![CDATA[The new song detals
1. verse one
2. verse two....]]>"</item>

        <item>"<![CDATA[The second song details
1. verse one
2. verse two....]]>"</item>
     
    </string-array>