Question

I have an activity which saves some data using sharedpreferences as below :

public void birthDateSharedPreferences(int calculatedBirthYear, int calculatedBirthMonth, int calculatedBirthDay)
    {
      SharedPreferences birthDatePreferences = PreferenceManager.getDefaultSharedPreferences(this);
      SharedPreferences.Editor editor = birthDatePreferences.edit();
      editor.putInt("birthChosenDay",calculatedBirthDay);
      editor.putInt("birthChosenMonth",calculatedBirthMonth);
      editor.putInt("birthChosenYear",calculatedBirthYear);
      editor.commit();
      Toast.makeText(birthDate.this,"The date was saved", Toast.LENGTH_LONG).show();
      Intent saved = new Intent(birthDate.this,MenuActivity.class);
      startActivity(saved);
      finish();
}

---

here is the second activity

SharedPreferences prefs = getPreferences(MODE_PRIVATE); 
                   int birthChosenDay = prefs.getInt("birthChosenDay", MODE_APPEND);

and I have another activity in which I want to use the data I saved in the first activity ,
I searched and tried some codes but nothing worked ! so how could I use the data which was saved in the first activity into the second activity ?

Answer 1

In the second activity you should get the default shared preferences (the one used while saving)..

SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
int birthChosenDay = prefs.getInt("birthChosenDay", MODE_APPEND);

AS:

 PreferenceManager.getDefaultSharedPreferences(this);

Will provide an access to a preferences file that is global for the whole application package ; any activity can access the preferences (internaly, the xml file holding the preferences will be named your.application.package_preferences.xml).

getPreferences(Context.MODE_PRIVATE);

Will provide preferences only for the contextInstance class: only instances of the context’s class can access these preferences (said your package is still your.application.package and you’re in your.application.package.SecondActivity, internaly the preferences file is SecondActivity.xml).