Android Shared Preferences (Java)

 Example : JAVA

// Storing data into SharedPreferences

SharedPreferences sharedPreferences = getSharedPreferences("MySharedPref",MODE_PRIVATE);

// Creating an Editor object to edit(write to the file)

SharedPreferences.Editor myEdit = sharedPreferences.edit();

// Storing the key and its value as the data fetched from edittext

myEdit.putString("name", name.getText().toString());

myEdit.putInt("age", Integer.parseInt(age.getText().toString()));

// Once the changes have been made,

// we need to commit to apply those changes made,

// otherwise, it will throw an error

myEdit.commit();

String s1 = sharedPreferences .getString("name", "defaultvalue");

int a = sharedPreferences .getInt("age", 0);

Nested classes of Shared Preferences  

1. SharedPreferences.Editor: Interface used to write(edit) data in the SP file. Once editing has been done, one must commit() or apply() the changes made to the file.
2. SharedPreferences.OnSharedPreferenceChangeListener(): Called when a shared preference is changed, added, or removed. This may be called even if a preference is set to its existing value. This callback will be run on your main thread.
3. contains(String key): This method is used to check whether the preferences contain a preference. 
    
4. edit(): This method is used to create a new Editor for these preferences, through which you can make modifications to the data in the preferences and atomically commit those changes back to the SharedPreferences object. 
    
5. getAll(): This method is used to retrieve all values from the preferences. 
    
6. getBoolean(String key, boolean defValue): This method is used to retrieve a boolean value from the preferences. 
    
7. getFloat(String key, float defValue): This method is used to retrieve a float value from the preferences. 
    
8. getInt(String key, int defValue): This method is used to retrieve an int value from the preferences. 
    
9. getLong(String key, long defValue): This method is used to retrieve a long value from the preferences. 
    
10. getString(String key, String defValue): This method is used to retrieve a String value from the preferences. 
     
11. getStringSet(String key, Set defValues): This method is used to retrieve a set of String values from the preferences. 
     
12. registerOnSharedPreferencechangeListener(SharedPreferences.OnSharedPreferencechangeListener listener): This method is used to registers a callback to be invoked when a change happens to a preference. 
     
13. unregisterOnSharedPreferencechangeListener(SharedPreferences.OnSharedPreferencechangeListener listener): This method is used to unregisters a previous callback.