在共享首选项中，当调用 editor.clear() 方法时，它只删除值或删除键值对

Question

Using shared preference, when I call editor.clear(), It delete only values (means that keys are available) or it delete key value pair.

check the following code.

SharedPreferences userlogindetails = getSharedPreferences("userdetails", MODE_PRIVATE);
SharedPreferences.Editor edituserlogindetails = userlogindetails.edit();                
edituserlogindetails.clear();//**it delete values or key value pairs.**
edituserlogindetails.apply();

Answer 1

According to SharedPreferences.Editor#remove you have to call remove()

remove

Added in API level 1

SharedPreferences.Editor remove (String key)

Mark in the editor that a preference value should be removed, which will be done in the actual preferences once commit() is called.

Note that when committing back to the preferences, all removals are done first, regardless of whether you called remove before or after put methods on this editor.

Here is an example

SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
SharedPreferences.Editor editor = preferences.edit();
editor.remove("key"); //Your key here
editor.apply();

Answer 2

It deletes/clears all the values of your shared preferences. And if you want to remove the key you have to use remove as mentioned in the answer by Michele.

Answer 3

Simply add ".commit()" as like this

sharedPreference?.edit()?.clear()?.commit()