Shared Preferences in Android. Save Data

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout 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="com.arham.csdevbin.downloadimagefrominternet.SharedPreferencesDemo">     <CheckBox         android:id="@+id/checkBox"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_alignParentLeft="true"         android:layout_alignParentStart="true"         android:layout_alignParentTop="true"         android:layout_marginLeft="103dp"         android:layout_marginStart="103dp"         android:layout_marginTop="136dp"         android:text="CheckBox" /> </RelativeLayout>

package com.arham.csdevbin.downloadimagefrominternet; import android.content.SharedPreferences; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.widget.CheckBox; import android.widget.CompoundButton; import android.widget.Toast; public class SharedPreferencesDemo extends AppCompatActivity implements CompoundButton.OnCheckedChangeListener {     CheckBox checkBox;     @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_shared_preferences);         checkBox = findViewById(R.id.checkBox);         checkBox.setOnCheckedChangeListener(this);     }     @Override     public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {         if (isChecked) {             checkBox.setText("The CheckBox is Checked");         } else {             checkBox.setText("The CheckBox is not Checked");         }     }     @Override     protected void onPause() {         super.onPause();         Toast.makeText(this, "onPause", Toast.LENGTH_SHORT).show();         SharedPreferences sharedPreferences = getPreferences(0);         SharedPreferences.Editor editor = sharedPreferences.edit();         editor.putString("CHECK_BOX_VALUE", checkBox.getText().toString());         editor.putBoolean("CH", checkBox.isChecked());         editor.commit();     }     @Override     protected void onResume() {         super.onResume();         Toast.makeText(this, "onResume", Toast.LENGTH_SHORT).show();         SharedPreferences sharedPreferences = getPreferences(0);         boolean checkBoxValue = sharedPreferences.getBoolean("CH", false);         String chBoxString = sharedPreferences.getString("CHECK_BOX_VALUE", "This is my CheckBox");         checkBox.setChecked(checkBoxValue);         checkBox.setText(chBoxString);     } }