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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

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