Как автоматически изменять число, в названии каждого нового ключа в SharedPreferences?

Question

У меня есть приложение с календарём и заметками. Первый activity(activity_main)-календарь, а второй(activity_notes)-заметки. Сохранение заметок осуществляется в SharedPreferences. Я хочу, чтобы каждому новому значению автоматически присваивался ключ в виде числа int(целого числа), которое будет уникальным в каждом созданном ключе. Можно ли такое реализовать? Если да, то как? Интересуют любые варианты. Код всех разметок и activity прилагается ниже. Заранее спасибо.

MainActivity.java:

package com.masterok.calendar;

import android.annotation.SuppressLint;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.AdView;
import com.google.android.gms.ads.MobileAds;
import com.google.android.gms.ads.initialization.InitializationStatus;
import com.google.android.gms.ads.initialization.OnInitializationCompleteListener;


public class MainActivity extends AppCompatActivity implements OnClickListener {
    Button notes;

    public AdView mAdView;


    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        notes = (Button) findViewById(R.id.notes);
        notes.setOnClickListener(this);

        MobileAds.initialize(this, new OnInitializationCompleteListener() {
            @Override
            public void onInitializationComplete(@NonNull InitializationStatus initializationStatus) {
            }
        });
        mAdView = findViewById(R.id.adView);
        AdRequest adRequest = new AdRequest.Builder().build();
        mAdView.loadAd(adRequest);
    }


    @SuppressLint("NonConstantResourceId")
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.notes:
                Intent intent = new Intent(this, Notes.class);
                startActivity(intent);

                break;
            default:
                break;
        }
    }
}

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">



    <Button
        android:id="@+id/notes"
        android:layout_width="114dp"
        android:layout_height="82dp"
        android:layout_marginStart="149dp"
        android:layout_marginLeft="149dp"
        android:layout_marginTop="376dp"
        android:layout_marginEnd="150dp"
        android:layout_marginRight="150dp"
        android:layout_marginBottom="162dp"
        android:text="@string/Notes"


        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <RelativeLayout
        android:layout_width="409dp"
        android:layout_height="729dp"
        android:layout_marginStart="1dp"
        android:layout_marginLeft="1dp"
        android:layout_marginTop="1dp"
        android:layout_marginEnd="1dp"
        android:layout_marginRight="1dp"
        android:layout_marginBottom="1dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <com.google.android.gms.ads.AdView
            android:id="@+id/adView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:layout_centerHorizontal="true"
            android:layout_marginBottom="106dp"
            app:adSize="BANNER"
            app:adUnitId="ca-app-pub-3940256099942544/6300978111">

        </com.google.android.gms.ads.AdView>


    </RelativeLayout>

    <CalendarView
        android:id="@+id/calendarView2"
        android:layout_width="281dp"
        android:layout_height="277dp"
        android:layout_marginStart="54dp"
        android:layout_marginLeft="54dp"
        android:layout_marginTop="20dp"
        android:layout_marginEnd="61dp"
        android:layout_marginRight="61dp"
        android:layout_marginBottom="275dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

Notes.java:

package com.masterok.calendar;

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;



import android.widget.EditText;
import android.widget.ImageButton;

import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;




public class Notes extends AppCompatActivity {

    final Context context = this;
    final Context context1 = this;
    public ImageButton button;
    public ImageButton button1;
    public TextView final_text;
    public SharedPreferences pref;
    public EditText input_text;
    public TextView notesView;
    public final String save_key = "save note";





    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_notes);

        notesView = (TextView) findViewById(R.id.notesView);
        button = (ImageButton) findViewById(R.id.imageButton3);
        final_text = (TextView) findViewById(R.id.final_text);
        button1 = (ImageButton) findViewById(R.id.clear_notes);

        init();

    }




    public void init(){
        pref = getSharedPreferences( "note",MODE_PRIVATE);
        input_text = (EditText) findViewById (R.id.input_text);
        notesView = (TextView) findViewById(R.id.notesView);
        notesView.setText(pref.getString(save_key,"You haven`t got any note"));

    }

    public void clear_notes(View arg0){

        LayoutInflater li = LayoutInflater.from(context1);
        View promptsView = li.inflate(R.layout.deleting_notes, null);


        AlertDialog.Builder mDialogBuilder = new AlertDialog.Builder(context1);
        mDialogBuilder.setView(promptsView);
        mDialogBuilder
                .setCancelable(false)
                .setPositiveButton("OK",
                        new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog,int id) {

                                SharedPreferences sharedPrefs = context.getSharedPreferences("note", MODE_PRIVATE);
                                SharedPreferences.Editor editor = sharedPrefs.edit();

                                editor.remove(save_key);
                                editor.apply();
                                notesView.setText(pref.getString(save_key,"You haven`t got any note"));

                            }
                        })
                .setNegativeButton("Cancel",
                        new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog,int id) {

                                dialog.cancel();
                            }
                        });

        AlertDialog alertDialog = mDialogBuilder.create();

        alertDialog.show();
    }



        public void addnote(View arg0) {

            LayoutInflater li = LayoutInflater.from(context);
            View promptsView = li.inflate(R.layout.prompt, null);

            AlertDialog.Builder mDialogBuilder = new AlertDialog.Builder(context);

            mDialogBuilder.setView(promptsView);

            final EditText userInput = promptsView.findViewById(R.id.input_text);

            mDialogBuilder
                    .setCancelable(false)
                    .setPositiveButton("OK",
                            new DialogInterface.OnClickListener() {
                                public void onClick(DialogInterface dialog,int id) {

                                    final_text.setText(userInput.getText());
                                    SharedPreferences.Editor edit = pref.edit();
                                    edit.putString(save_key,final_text.getText().toString());
                                    edit.apply();

                                    notesView.setText(pref.getString(save_key,"You haven`t got any note"));

                                }
                            })
                    .setNegativeButton("Cancel",
                            new DialogInterface.OnClickListener() {
                                public void onClick(DialogInterface dialog,int id) {
                                    dialog.cancel();
                                }
                            });


            AlertDialog alertDialog = mDialogBuilder.create();

            alertDialog.show();
            }


}

activity_notes.xml:

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="Notes">

    <ImageButton
        android:id="@+id/imageButton3"
        android:layout_width="83dp"
        android:layout_height="73dp"
        android:layout_marginStart="1dp"
        android:layout_marginLeft="1dp"
        android:layout_marginBottom="5dp"
        android:contentDescription="@string/addnote"

        android:onClick="addnote"
        android:src="@android:drawable/ic_input_add"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        tools:ignore="ImageContrastCheck" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="279dp"
        android:layout_marginBottom="324dp"
        android:orientation="vertical"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

    </LinearLayout>


    <ImageButton
        android:id="@+id/clear_notes"
        android:layout_width="65dp"
        android:layout_height="55dp"
        android:layout_marginStart="335dp"
        android:layout_marginLeft="335dp"
        android:layout_marginTop="538dp"
        android:layout_marginEnd="11dp"
        android:layout_marginRight="11dp"
        android:layout_marginBottom="10dp"
        android:contentDescription="@string/delete_notes"
        android:onClick="clear_notes"
        android:src="@android:drawable/ic_menu_delete"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:ignore="SpeakableTextPresentCheck" />

    <TextView
        android:id="@+id/notesView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"


        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="16dp"
        android:layout_marginEnd="7dp"
        android:layout_marginRight="7dp"
        android:layout_marginBottom="556dp"
        android:textSize="20sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/final_text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="4dp"
        android:layout_marginLeft="4dp"
        android:layout_marginTop="32dp"
        android:layout_marginBottom="497dp"
        app:layout_constraintBottom_toTopOf="@+id/imageButton3"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

prompt.xml(Диалог добавления заметки):

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/layout_root"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    android:padding="10dp" >
    <TextView
        android:id="@+id/tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/write_the_note"
        android:textAppearance="?android:attr/textAppearanceLarge" />

    <EditText
        android:id="@+id/input_text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        >

        <requestFocus />
    </EditText>
</LinearLayout>

deleting_notes.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="@string/do_you_want_to_clear_notes" />
</LinearLayout>

БЛОГ НА HUSL

Как автоматически изменять число, в названии каждого нового ключа в SharedPreferences?

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