Send data amongst three activities

Question

I have 3 activities, that connect like this: A -> B -> C.

On A you input a text that will be used in C, then B opens and you input another text to be used in C. But when C opens, produces null errors.

I came up with a solution, to start A then go directly to C and onCreate of C, start B as if it was going from A to B.

Is there a better solution? Is my solution decent or will it cause more problems than it fixes? Thanks for any help.

Answer 1

There are several options - Intent extras, SharedPreferences, SQLite database, internal/external storage, Application class, static data classes etc.

For situation you've explained, I recommend using SharedPreferences to store data, it's relatively easy approach and you can access stored data at any time from any Activity or class, here is a simple usage guide:

Input data into SharedPreferences:

SharedPreferences.Editor editor = getSharedPreferences("YourPrefsFile", MODE_PRIVATE).edit();
 editor.putString("name", "Elena");
 editor.putInt("idName", 12);
 editor.apply();

Get data from SharedPreferences:

SharedPreferences prefs = getSharedPreferences("YourPrefsFile", MODE_PRIVATE); 
String restoredText = prefs.getString("text", null);
if (restoredText != null) {
  String name = prefs.getString("name", "");
  int idName = prefs.getInt("idName", 0);
}