All about SharedPreferences in Android app- create, retrieve and delete - Android Studio Tutorial

This video gives details and demonstrates to create, retrieve or delete the shared preference variables as your Android App data.

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Complete source code and other details/ steps of this video are posted in the below link:
https://programmerworld.co/android/all-about-sharedpreferences-in-android-app-create-retrieve-and-delete-the-variable-android-studio-tutorial/


However, the main Java code is copied below also for reference:

package com.programmerworld.sharedpreferenceapp;

import androidx.appcompat.app.AppCompatActivity;

import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

private TextView textView;
private EditText editText;

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

textView = findViewById(R.id.textView);
editText = findViewById(R.id.editText);
}


public void buttonPut(View view){
SharedPreferences sharedPreferences = getPreferences(MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();

editor.clear();
editor.putString("stringUserData", editText.getText().toString());
editor.putString("stringProgrammerWorld", "This is Programmer World");
editor.apply();
}

public void buttonGet(View view){
SharedPreferences sharedPreferences = getPreferences(MODE_PRIVATE);
String stringSharedPref_UserData = sharedPreferences.getString("stringUserData", null);
String stringSharedPref_PWorld = sharedPreferences.getString("stringProgrammerWorld", null);

if (stringSharedPref_UserData == null &&
stringSharedPref_PWorld == null){
textView.setText("Shared Preference Variables do NOT exits");
}
else {
textView.setText(stringSharedPref_PWorld + "\n" + stringSharedPref_UserData);
}
}

public void buttonDeleteAll(View view){
SharedPreferences sharedPreferences = getPreferences(MODE_PRIVATE);
//removes all the shared preference variables
sharedPreferences.edit().clear().commit();
}

public void buttonDelete(View view){
SharedPreferences sharedPreferences = getPreferences(MODE_PRIVATE);
// removes specific shared preference variable
sharedPreferences.edit().remove("stringUserData").commit();
}
}


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