How to clear SharedPreferences during Logout?

Question

SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(Login.this);
SharedPreferences.Editor editor = prefs.edit();
editor.putString("UID", jobj1.getString("admin_id").toString());
editor.apply();

Toast toast = Toast.makeText(Login.this, "Login Successfully", Toast.LENGTH_SHORT);
toast.setGravity(Gravity.CENTER | Gravity.CENTER_HORIZONTAL, 0, 0);
toast.show();
Intent i1=new Intent(Login.this,DashBoard.class);
startActivity(i1);
finish();

This is my logout code using Intent, I want to clear the SharedPreference when I click logout button.

case "Logout":
              Intent i5=new Intent(context1, Login.class);
              i5.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
              context1.startActivity(i5);
              ((DashBoard)context1).finish();
              Toast.makeText(context1,"Logout",Toast.LENGTH_LONG).show();

What should the code do? Which code does not work? And what exactly goes different? — greenapps, Apr 12 '18 at 08:41
logout.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { // Launching News Feed Screen SharedPreferences preferences =getSharedPreferences("loginPrefs",Context.MODE_PRIVATE); SharedPreferences.Editor editor = preferences.edit(); editor.clear(); editor.commit(); finish(); }); — Manish Ahire, Apr 12 '18 at 08:43
you are trying to clear different preferences. You need to clear same as you are writing to. — Vladyslav Matviienko, Apr 12 '18 at 08:45

score 4 · Answer 1 · edited Apr 12 '18 at 08:51

4

Use clear() method:

SharedPreferences.Editor editor = PreferenceManager.getDefaultSharedPreferences(this).edit();
editor.clear()
editor.apply()

edited Apr 12 '18 at 08:51

Dumbo

1,630
18
33

answered Apr 12 '18 at 08:44

will

399
1
11

Priyank Patel · Answer 2 · 2018-04-12T09:09:04.740

For API 24 (Nougat) or higher you can just call deleteSharedPreferences(String name)

context.deleteSharedPreferences("YOUR_PREFS");

However, there is no backward compatibility, so if you're supporting anything less than 24 you can use apply() for non-blocking asynchronous operation.

context.getSharedPreferences("YOUR_PREFS", Context.MODE_PRIVATE).edit().clear().apply(); //apply() for non-blocking asynchronous operation

Or in your case,

PreferenceManager.getDefaultSharedPreferences(getBaseContext()).edit().clear().apply();

commit() : writes the data synchronously (blocking the thread its called from) and returns about the success of the operation.

apply() : schedules the data to be written asynchronously. It does not inform you about the success of the operation.

As per official docuement, If you don't care about the return value and you're using this from your application's main thread, consider using apply() instead of commit().

score 0 · Answer 3 · answered Apr 12 '18 at 08:42

0

SharedPreferences preferences = context.getSharedPreferences("pref_name, Context.MODE_PRIVATE);
preferences.edit().clear().commit();

answered Apr 12 '18 at 08:42

Yossi

327
2
5

would prefer `.apply()` instead of `.commit()` , as **apply* is asynchronous call – Abdul Kawee Apr 12 '18 at 08:45

score 0 · Answer 4 · answered Apr 12 '18 at 09:18

0

SharedPreferences.Editor editor = PreferenceManager.getDefaultSharedPreferences(this).edit();
editor.remove("UID");//your key
editor.commit();

clear() can remove all values from the preferences.

answered Apr 12 '18 at 09:18

Jaydeep chatrola

2,423
11
17

How to clear SharedPreferences during Logout?

4 Answers4