Android : Approach of passing variable generated in click event of fragment and popup window to activity

Question

I wonder what kind of approach available for the transfer of the variable generated from class of fragment or popup window to activity provided that the fragment or popup window class is separated from activity.

Any code example of elegant approach is appreciated.

Answer 1

It all depend of what kind of data you wish to pass between fragment or popup window to activity one way can be using intent

    //create an Intent object 
        Intent intent=new Intent(context, Activity.class);
    //add data to the Intent object
        intent.putExtra("text", "Data");
    //start the second activity
        startActivity(intent);

and for receiving intent data use

getIntent().getStringExtra("text")

Another way can be using sharedpreferences

SharedPreferences prefs = this.getSharedPreferences(
      "com.example.app", Context.MODE_PRIVATE);

To read preferences: String dateTimeKey = "com.example.app.datetime";

// use a default value using new Date()

long l = prefs.getLong(dateTimeKey, new Date().getTime()); 

To edit and save preferences

Date dt = getSomeDate();
prefs.edit().putLong(dateTimeKey, dt.getTime()).apply();