Shared Preferences Tutorial

• SharedPreferences are used to store some data persistently.
• Similar to database in functionality, but easy to use as compare to database and developer prefer SharedPreferences for storing small amount of data
• Usually use to store the flag variable values.
• Like Storing sound on /off flag of application

We can get SharedPreferences object using following method.

 

Public abstract SharedPreferences getSharedPreferences (String name, int mode)

name	Desired Name of the file. If a preferences file by this name does not exist, it will be created when you retrieve an editor (SharedPreferences.edit ()) and then commit changes (Editor. Commit ()).
mode	File Creation Mode. Use 0 or MODE_PRIVATE for the default operation.

SharedPreferences mSharedPreferences =getApplicationContext().getSharedPreferences("pref", MODE_PRIVATE);

        /*

         * TO WRITE VALUES INTO THE  PREFERENCE FILE

         */

       

       

        //get Editor object using  sharedPreference edit() Method

               

        Editor mEditor= mSharedPreferences.edit();

        //set boolean Values  into preference files

             

        mEditor.putBoolean("booleanValue", true);

        //set String value into the preference file

        mEditor.putString("stringValue", "hello");

        //set integer value into the preference file

        mEditor.putInt("intValue", 1);

        //set the long value into the preference file

        mEditor.putLong("longValue", 1212121);

        //set the float value into the preference file

        mEditor.putFloat("floatValue", 10.0f);

        //commit the changes

        mEditor.commit();

       

       

        /*

         * TO READ THE VALUES FROM THE PREFERENCE FILE

         */

        //get the boolean value from preference

        Boolean booleanValue=mSharedPreferences.getBoolean("boolean", true);

        //get the String value from  preference

        String stringValue=mSharedPreferences.getString("stringValue", "default value");

        //get the int value from preference

        int intValue=mSharedPreferences.getInt("intValue", 1);

        //get the long value from preference

        Long longValue=mSharedPreferences.getLong("longValue", 1212121);

        //get the float value from the preference

        Float floatValue=mSharedPreferences.getFloat("floatValue", 10.0f);

       

References:

http://developer.android.com/guide/topics/data/data-storage.html#pref