안드로이드 스튜디오 데이터 저장 2 (SharedPreferences)

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <Button
            android:id="@+id/save"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="save" />

        <Button
            android:id="@+id/delete"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="delete" />
    </LinearLayout>
    <EditText
        android:id="@+id/text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Text"
        android:textSize="20dp"
        android:inputType="textPersonName"/>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <Button
            android:id="@+id/red"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="red" />

        <Button
            android:id="@+id/green"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="green" />

        <Button
            android:id="@+id/blue"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="blue" />

        <Button
            android:id="@+id/random"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="random" />
    </LinearLayout>
</LinearLayout>

package com.example.save;

import androidx.appcompat.app.AppCompatActivity;

import android.content.SharedPreferences;
import android.graphics.Color;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

import org.w3c.dom.Text;

import java.util.Random;

public class MainActivity extends AppCompatActivity {

    private SharedPreferences Pre;
    private SharedPreferences.Editor editor;
    private int select;
    Button save,delete,red,green,blue,radom;
    EditText text;
    Random r = new Random();
    int red1 = r.nextInt(256),green1 = r.nextInt(256), blue1 = r.nextInt(256);

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        text = findViewById(R.id.text);
        save = findViewById(R.id.save);
        delete = findViewById(R.id.delete);
        red = findViewById(R.id.red);
        green = findViewById(R.id.green);
        blue = findViewById(R.id.blue);
        radom = findViewById(R.id.random);

        setListenerColorbtn();
        setListenerPreferencebtn();

        Pre = PreferenceManager.getDefaultSharedPreferences(this);
        editor = Pre.edit();

        initializeValue();

    }
    public void setListenerColorbtn(){
        View.OnClickListener Listener = new View.OnClickListener(){
            @Override
            public void onClick(View v) {
                switch (v.getId()) {
                    case R.id.red:
                        select = Color.RED;
                        text.setTextColor(Color.RED);
                        break;
                    case R.id.blue:
                        select = Color.BLUE;
                        text.setTextColor(Color.BLUE);
                        break;
                    case R.id.green:
                        select = Color.GREEN;
                        text.setTextColor(Color.GREEN);
                        break;
                    case R.id.random:
                        select = Color.rgb(red1,green1,blue1);
                        text.setTextColor(Color.rgb(red1,green1,blue1));
                        break;
                }
            }
        };
        red.setOnClickListener(Listener);
        blue.setOnClickListener(Listener);
        green.setOnClickListener(Listener);
        radom.setOnClickListener(Listener);
    }
    public void setListenerPreferencebtn() {
        View.OnClickListener Listener = new View.OnClickListener(){
            @Override
            public void onClick(View v) {
                switch (v.getId()) {
                    case R.id.save:
                        editor.putInt("color", select);
                        editor.putString("text", text.getText().toString());
                        editor.apply();
                        break; //데이터 저장
                    case R.id.delete:
                        editor.remove("color");
                        editor.remove("text");
                        editor.apply();
                        break; //데이터 삭제
                }
            }
        };
        save.setOnClickListener(Listener);
        delete.setOnClickListener(Listener);
    }
    private void initializeValue() {
        text.setText(Pre.getString("text","저장된 데이터가 없어요"));
        text.setTextColor(Pre.getInt("color", Color.BLACK));
    }
}