Custom file to make SharedPreference easier

build.gradle

//app level build.gradle file
implementation "androidx.security:security-crypto:1.0.0-alpha02"

EncryptedSharedPref.java

import android.content.Context;
import android.content.SharedPreferences;

import androidx.security.crypto.EncryptedSharedPreferences;
import androidx.security.crypto.MasterKeys;

import java.io.IOException;
import java.security.GeneralSecurityException;

public class EncryptedSharedPref{
    private Context context;
    private String encryptedSharedPrefName = "encyrptSharedPref";
    private SharedPreferences encryptedSharedPref;
    private SharedPreferences.Editor editor;
    private String masterKeyAlias;

    //public constructor
    public EncryptedSharedPref(Context context){
        this.context = context;
        init();
    }

    private void init() {
        try {
            //create masterKeyAlias which will be used to encrypt data
            masterKeyAlias = MasterKeys.getOrCreate(MasterKeys.AES256_GCM_SPEC);

            //create instance of EncryptedSharedPreferences by using its encryption schemes
            encryptedSharedPref = EncryptedSharedPreferences.create(
                    encryptedSharedPrefName,
                    masterKeyAlias,
                    context,
                    EncryptedSharedPreferences.PrefKeyEncryptionScheme.AES256_SIV,
                    EncryptedSharedPreferences.PrefValueEncryptionScheme.AES256_GCM
            );

            editor = encryptedSharedPref.edit();
        } catch (GeneralSecurityException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    //return 'value' saved with 'key'
    public String getData(String key){
        return encryptedSharedPref.getString(key,"na");
    }

    //save 'value' with 'key'
    public void saveData(String key, String value){
        editor.putString(key,value);
        editor.commit();
    }
}

MainActivity-using-encryptedSharedPreference.java

//create instance of EncryptedSharedPref
EncryptedSharedPref encryptedSharedPref = new EncryptedSharedPref(MainActivity.this);

//saving same data to encryptedSharedPref
encryptedSharedPref.saveData("username","ayaz");

//get data from encryptedSharedPref
encryptedSharedPref.getData("name");

MainActivity-using-sharedPreference.java

//create instance of SharedPref
SharedPref sharedPref = new SharedPref(MainActivity.this);

//save data to sharedPreference
sharedPref.saveData("username","ayaz");

//get data from sharedPreference
sharedPref.getData("name");

SharedPref.java

import android.content.Context;
import android.content.SharedPreferences;

public class SharedPref {
    private Context context;
    private String sharedPrefName = "sharedpref";
    private SharedPreferences sharedPreferences;
    private SharedPreferences.Editor editor;

    //public constructor
    public SharedPref(Context context){
        this.context = context;
        init();
    }

    //initialize values
    private void init(){
        sharedPreferences = context.getSharedPreferences(sharedPrefName, Context.MODE_PRIVATE);
        editor = sharedPreferences.edit();
    }

    //return 'value' saved with 'key'
    public String getData(String key){
        return sharedPreferences.getString(key,"na");
    }

    //save 'value' with 'key'
    public void saveData(String key, String value){
        editor.putString(key,value);
        editor.commit();
    }
}