How to access android Shared preferences(using java) on the flutter end (using dart)?

Question

I have tried to many days but getting null value on flutter side.

I have shared the code. Please let me know is there anything wrong?

I also refer the link How to access flutter Shared preferences on the android end (using java) but it it exact opposite my requirements.

MainActivity.java

SharedPreferences  prefs = contextApplication.getSharedPreferences("preference", MODE_PRIVATE);
//save in shared prefs
prefs.edit().putString("hashMapEventsInBg_session", hashMapString).apply();

main.dart

 SharedPreferences  sp = await SharedPreferences.getInstance();
  var demosession = sp.getString("hashMapEventsInBg_session");

Solution 1

What you can do is:

1. Set the name in getSharedPreferences to "FlutterSharedPreferences".

getSharedPreferences("FlutterSharedPreferences", MODE_PRIVATE)

2. Always prefix "flutter." in the key of any pair.

putString("flutter.test", "Hello")

Kotlin Code.

  val prefs: SharedPreferences = getSharedPreferences("FlutterSharedPreferences", MODE_PRIVATE)
  prefs.edit().putString("flutter.test", "Hello").apply()

3. Read the value like this in Flutter.

String test = (await SharedPreferences.getInstance()).getString("test"); //returns Hello.

Solution 2

if you use android java

on android side

 Map<String, String> data = yourdata;
 SharedPreferences preferences = this.getSharedPreferences("FlutterSharedPreferences",MODE_PRIVATE);
 JSONObject jsonObject = new JSONObject(message);
 String jsonString = jsonObject.toString();
 SharedPreferences.Editor editor = preferences.edit();
 editor.putString("flutter.msg",jsonString);
 editor.apply();

on flutter side

SharedPreferences preferences = await SharedPreferences.getInstance();
    if(preferences.containsKey('msg')){
       final message  =  preferences.getString('msg');
        Map data = json.decode(message);
         
    }