EncryptionHelper for encrypting json file
Add below code in a Java file named EncryptionHelper.java. import android.content.ContentResolver; import android.content.ContentValues; import android.content.Context; import android.database.Cursor; import android.net.Uri; import android.os.Environment; import android.os.ParcelFileDescriptor; import android.provider.MediaStore; import android.provider.OpenableColumns; import android.util.Base64; import android.webkit.MimeTypeMap; import android.widget.Toast; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.InputStream; import java.io.ByteArrayOutputStream; import java.nio.charset.StandardCharsets; import java.security.spec.KeySpec; import javax.crypto.Cipher; import javax.crypto.CipherInputStream; import javax.crypto.CipherOutputStream; import javax.crypto.SecretKey; import javax.crypto.SecretKeyFactory; import javax.crypto.spec.GCMParameterSpec; import javax.crypto.spec.PBEKeySpec; import javax.crypto.spec.SecretKeySpec; publ...