How to save ImageView Drawable State?

Question

I want to save my LED_F1 state which is an ImageView,On a certain condition I'm changing the drawable image to another Led color .My Question is How do I save LED_F1 drawable image ? Thanks

   public void LightOn_Drawable_Change()
{
    LED_F1.SetBackgroundResource(Resource.Drawable.LEDGreen_F1);
    //Add Preferences
    var LED_F1_State = Application.Context.GetSharedPreferences("LED_F1 State",FileCreationMode.Private);
    var LED_F1_Editable = LED_F1_State.Edit();
    //LED_F1_Editable.PutInt("owais",LED_F1.Drawable.GetState); //What should I do here ? 
}

Answer 1

Hello,

Welcome to our Microsoft Q&A platform!

Since the returned type of function imageView.Drawable.GetState() is a list, and If you want to use SharedPreferences to save the status of your ImageView, you can try to use JsonConvert to convert it to a string and save this string into SharedPreference.

You can refer to the following code:

1.Save value:

        int[] states = imageView.Drawable.GetState();  
        string mstr = JsonConvert.SerializeObject(states);  

        ISharedPreferences prefs = PreferenceManager.GetDefaultSharedPreferences(this);  
        ISharedPreferencesEditor editor = prefs.Edit();  
        editor.PutString("states", mstr);  
        editor.Apply();  

2.access value:

      ISharedPreferences prefs = PreferenceManager.GetDefaultSharedPreferences(this);  
       string mString = prefs.GetString("states", "");  
      var mList = JsonConvert.DeserializeObject<List<int>>(mString);  

      Toast.MakeText(this, " The first status" + mList[0] ,ToastLength.Long).Show();  

Best Regards,

Jessie Zhang

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Answer 2

Sorry for the very late reply ,If this for a drawble ,I have a string number that I want to save ,but its giving me a Newtonsoft.Json.JsonReaderException

     protected override void OnCreate(Bundle savedInstanceState)
    {
        base.OnCreate(savedInstanceState);

        // Create your application here

        // Create your application here
        SetContentView(Resource.Layout.SecondActivity);
        _smsManager_SecondActivity = SmsManager.Default;



        Backbutton = FindViewById<ImageButton>(Resource.Id.backarrow);
        CellNumber = FindViewById<EditText>(Resource.Id.entercellnumber);
        Complaintbutton = FindViewById<ImageButton>(Resource.Id.complaintbutton);

        CellNumber.ClearFocus();
        CellNumber.SetCursorVisible(false);


        CellNumber.KeyPress += CellNumber_KeyPress;

         ISharedPreferences prefs = PreferenceManager.GetDefaultSharedPreferences(this);
         string mString = prefs.GetString("CellNumber", "");
         var mList = JsonConvert.DeserializeObject<User>(mString);
         Toast.MakeText(this, " The first status" + mList, ToastLength.Long).Show();
         CellNumber.Text = mList.Number; 
    }

    public class User
    {
        public string Number { get; set; }
        public string OH_TankSize { get; set; }
        public string UG_TankSize { get; set; }
    }

    private void CellNumber_KeyPress(object sender, View.KeyEventArgs e)
    {
        User user = new User() { Number = CellNumber.Text };

        e.Handled = false;
        if (e.Event.Action == KeyEventActions.Down && e.KeyCode == Keycode.Enter)
        {
            Toast.MakeText(this, CellNumber.Text, ToastLength.Short).Show();
            Preferences.Set("CellNumber", CellNumber.Text);
            CellNumber.SetText(Preferences.Get("CellNumber", "Default_value"), TextView.BufferType.Editable);

            string mstr = JsonConvert.SerializeObject(user.Number);

            ISharedPreferences pref = Application.Context.GetSharedPreferences("UserInfo", FileCreationMode.Private);
            ISharedPreferencesEditor edit = pref.Edit();
            edit.PutString("CellNumber",mstr);
            edit.Apply();   
        }

Im trying to access the string on the same page , first I'll type the number in a edittext, it saves the data , and then in Oncreate() I try to retrieve it !