SharedPreferences from different activity

Question

I load from activity A the SharedPreferences in following way:

private void SavePreferences(String key, String value){     SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);      SharedPreferences.Editor editor = sharedPreferences.edit();     editor.putString(key, value);     editor.commit(); } 

At activity B I want to load the SharedPreferences. Following was a NullPointerException:

private void LoadPreferences(){        SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);     data = sharedPreferences.getString("name", "08:00") ; } 

If I try following, I get this compilation error: "No enclosing instance of the type A is accessible in scope"

private void LoadPreferences(){        SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(A.this);     data = sharedPreferences.getString("name", "08:00") ; } 

How can I access the data?

Answer 1

use getApplicationContext() instead of this in both Activities as:

In activity A the SharedPreferences in following way:

 private void SavePreferences(String key, String value){         SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());          SharedPreferences.Editor editor = sharedPreferences.edit();         editor.putString(key, value);         editor.commit();         Intent sd=new Intent(this,Secongtess.class);         startActivity(sd);        } 

and in Activity B get Value as:

 private void LoadPreferences(){           SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());      String  data = sharedPreferences.getString("name", "08:00") ;      Toast.makeText(this,data, Toast.LENGTH_LONG).show();    } 

because as doc says:

getDefaultSharedPreferences(Context context) :

Gets a SharedPreferences instance that points to the default file that is used by the preference framework in the given context.