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Android SharedPreferences Basics

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You can save and retrieve key, value pair data from Shared preferences.
SharedPreferences values will persist across user sessions. Data in shared preferences will be persistent even though user closes the application.
You can get values from Shared preferences using getSharedPreferences() method.
You also need an editor to edit and save the changes in shared preferences.
Use SharedPreferences to store data: booleans, floats, ints, longs, and strings.

 

Available mode for shared preference:

   1. MODE_WORLD_READABLE
   2. MODE_WORLD_WRITEABLE
   3. MODE_PRIVATE

 

 

Store,Fetch,Remove,Clear Data from SharedPreferences.

 


/******* Create SharedPreferences *******/

    SharedPreferences pref = getApplicationContext().getSharedPreferences("MyPref", MODE_PRIVATE); 
    Editor editor = pref.edit();


/**************** Storing data as KEY/VALUE pair *******************/

    editor.putBoolean("key_name1", true);           // Saving boolean - true/false
    editor.putInt("key_name2", "int value");        // Saving integer
    editor.putFloat("key_name3", "float value");    // Saving float
    editor.putLong("key_name4", "long value");      // Saving long
    editor.putString("key_name5", "string value");  // Saving string
    
    // Save the changes in SharedPreferences
    editor.commit(); // commit changes


/**************** Get SharedPreferences data *******************/

// If value for key not exist then return second param value - In this case null

    pref.getBoolean("key_name1", null); 		// getting boolean
    pref.getInt("key_name2", null); 			// getting Integer
    pref.getFloat("key_name3", null); 			// getting Float
    pref.getLong("key_name4", null); 			// getting Long
    pref.getString("key_name5", null); 			// getting String




/************ Deleting Key value from SharedPreferences *****************/

    editor.remove("key_name3"); // will delete key key_name3
    editor.remove("key_name4"); // will delete key key_name4
    
    // Save the changes in SharedPreferences
    editor.commit(); // commit changes
   
/************ Clear all data from SharedPreferences *****************/   

     editor.clear();
     editor.commit(); // commit changes

 

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