SharedPreference example in Android

 SharedPreference example in Android

Application shared preferences allows you to save and retrieve data in key, value pair.
Initialization of SharedPreference in Android:.

Application shared preferences can be fetched using getSharedPreferences() method.The following code can be used to get application shared preferences.

       SharedPreferences pref = getApplicationContext().getSharedPreferences(

                           "any_prefname", MODE_PRIVATE);

Available mode for shared preference:

• MODE_WORLD_READABLE
• MODE_WORLD_WRITEABLE
  
• MODE_PRIVATE
  

To edit sharedpreference value, we need editor to edit and save the changes in shared preferences.

Editor editor = pref.edit();

and to save data commit() is used.

Editor.commit();

You can save data into shared preferences using editor. All the primitive data types like booleans, floats, ints, longs, and strings are supported. Call editor.commit() in order to save changes to shared preferences.

              editor.putBoolean("key_name", true); // Storing boolean - true/false

              editor.putString("key_name", "string value"); // Storing string

              editor.putInt("key_name", "int value"); // Storing integer

              editor.putFloat("key_name", "float value"); // Storing float

              editor.putLong("key_name", "long value"); // Storing long

         editor.commit(); // commit changes

Get data from Shared Preference:

Data can be retrived from saved preferences by calling getString() (For string) method.for boolean getBoolean() Remember this method should be called on Shared Preferences not on Editor.

// returns stored preference value

// If value is not present return second param value - In this case null

              pref.getString("key_name", null); // getting String

              pref.getInt("key_name", null); // getting Integer

              pref.getFloat("key_name", null); // getting Float

              pref.getLong("key_name", null); // getting Long

              pref.getBoolean("key_name", null); // getting boolean

Delete data from shared preference and delete sharedpreference:

To delete data from shared preferences we can use remove(“key_name”).If we want to delete all the data, call clear()

editor.remove("student_name");//will delete student_name editor.commit();

Following will clear all the data from shared preferences

editor.clear(); editor.commit();

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