Question

i have created a sharedpreferences data in one activity, is it possible to be used in another activity? if yes, how could this be achieved?

The names of the 4 players are saved in NameIndex.java, and I would like to use the saved Names of the 4 players in the MainActivity.java

Under NameIndex.java:

   private void SaveNamesToFile(String Game1, String P1Name, String P2Name, String P3Name, String P4Name)
   // save the new row to the file, then refresh all Buttons
   {
      // originalScore will be null if we're modifying a slot that is existing already     
      String originalNameP1 = SavedNameP1.getString(Game1, null); // to return null if this preference does not exist. 
      String originalNameP2 = SavedNameP2.getString(Game1, null);
      String originalNameP3 = SavedNameP3.getString(Game1, null);
      String originalNameP4 = SavedNameP4.getString(Game1, null);

      // get a SharedPreferences.Editor to store new row data
      SharedPreferences.Editor preferencesEditorP1 = SavedNameP1.edit();
      SharedPreferences.Editor preferencesEditorP2 = SavedNameP2.edit();
      SharedPreferences.Editor preferencesEditorP3 = SavedNameP3.edit();
      SharedPreferences.Editor preferencesEditorP4 = SavedNameP4.edit();

      preferencesEditorP1.putString(Game1, P1Name);
      preferencesEditorP2.putString(Game1, P2Name);
      preferencesEditorP3.putString(Game1, P3Name);
      preferencesEditorP4.putString(Game1, P4Name);

      preferencesEditorP1.apply();
      preferencesEditorP2.apply();
      preferencesEditorP3.apply();
      preferencesEditorP4.apply();  
   }

Answer 1

I used one SharedPreferences file between activities, but what I did was using the same file name declared in different private variables inside the two activities. You can check my code in the following link. What I don’t understand is why you use 4 SharedReferences files just for the names of the players and not all the names in just 1 file. That’s possible because I used it to save more than 2 variables.