I am new at this Kotlin language when doing Android Studio and I was working on the code and I was stuck on how to combine Shared Preferences with data structures such as (Array List) though so that I can store an array of data. I was wondering if there any way how I can able to do solve this problem? Any suggestion?

class CreateAccount : AppCompatActivity() {
private lateinit var btnCreateAccount: Button
private lateinit var userName : EditText
private lateinit var fullName: EditText
private lateinit var email: EditText
private lateinit var password: EditText
private lateinit var confirmPassword: EditText

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_create_account)

    btnCreateAccount= findViewById(R.id.buttonCreateAccount)
    email = findViewById(R.id.editTextEmailAddress)
    confirmPassword = findViewById(R.id.editConfirmPassword)
    password = findViewById(R.id.editPassword)
    userName = findViewById(R.id.editTextUserName)
    fullName = findViewById(R.id.editTextPersonName)



    btnCreateAccount.setOnClickListener {
        validateEmptyForm()
    }
}

private fun validateEmptyForm(){
    if(fullName.text.toString().isNotEmpty() && userName.text.toString().isNotEmpty() && email.text.toString().isNotEmpty() && password.text.toString().isNotEmpty() && confirmPassword.text.toString().isNotEmpty()){
        //Need a valid Email to work (ex. [email protected])
        if(email.text.toString().matches(Regex("[a-zA-Z0-9._] @[a-z]. [a-z]"))) {
            if (password.text.toString() == confirmPassword.text.toString()) {
                Toast.makeText(this, "Created Account Successful!", Toast.LENGTH_LONG).show()
                saveData()

                val intent = Intent(this,MainActivity::class.java)
                startActivity(intent)
            }

        }
        else{
            email.setError("Please Enter a Valid Email")

        }
    }
    else{
        Toast.makeText(this,"Need to All Information",Toast.LENGTH_SHORT).show()
    }
}


private fun saveData(){
//Save user Info, but not stored?
    val sharedPref = getSharedPreferences("UserAccount",Context.MODE_PRIVATE)
    val edit = sharedPref.edit()

    edit.putString("Name", fullName.text.toString())
    edit.putString("User Name", userName.text.toString())
    edit.putString("Email",email.text.toString())
    edit.putString("Password",password.text.toString())

    edit.apply()


    Toast.makeText(this,"Data has been saved",Toast.LENGTH_LONG).show()

}



}

CodePudding user response：

What Tenfour04 said. yup

This is extension I did for class(Mood) objects:

fun preferenceToObject(MOOD_DAY_PREFERENCE: String ): Mood {
        moodSharedPref = getSharedPreferences(FILE_NAME, AppCompatActivity.MODE_PRIVATE)

        val moodJsonString = moodSharedPref.getString(MOOD_DAY_PREFERENCE, null)
        dayMoodObject = Gson().fromJson<Mood>(moodJsonString, Mood::class.java)

       return dayMoodObject
    }

    fun objectToPreference(mood: Mood,PREFERENCE_NAME:String){
        moodSharedPref = getSharedPreferences(FILE_NAME, MODE_PRIVATE)
        val moodSharedPrefEditor = moodSharedPref.edit()

        val moodJsonString = Gson().toJson(mood)

        moodSharedPrefEditor.putString(PREFERENCE_NAME,moodJsonString).apply()

CodePudding user response：

There are 3 ways to store data on android.

Each way has different strengths and weaknesses

Method 1: Store through share preference

How do you save/store objects in SharedPreferences on Android?

Method 2: Store through database room

https://developer.android.com/training/data-storage/room

https://github.com/googlecodelabs/android-room-with-a-view

Method 3: Online storage of this requires a server