)SharedPreferences allows activities and applications to keep preferences, in th

Question

)SharedPreferences allows activities and applications to keep preferences, in the form of key-value pairs similar to a Map that will persist even when the user closes the application. Write an Android application that uses SharedPrefences to persist and to retrieve data to/from SharedPreferences respectively as described below:

• There are two EditTexts, one for name and another for email address.

• There are three buttons: SAVE, RETRIEE, and CLEAR.

o The SAVE button will save the name and the email address in the SharedPreferences.

oThe RETRIEVE button will retrieve the name and the email address from the SharedPreferences.

o The CLEAR button will clear the EditTexts.

• Upon startup, the App will retrieve the name and the email address from the SharedPreferences if exist.

Explanation / Answer

saving data

SharedPreferences pref = getSharedPreferences("MyPrefs", Context.MODE_PRIVATE);

// We need an editor object to make changes
SharedPreferences.Editor edit = pref.edit();

// Set/Store data
edit.putString("username", "Rishabh");
edit.putBoolean("logged_in", true);

// Commit the changes
edit.commit();

xml file
<?xml version='1.0' encoding='utf-8' standalone='yes' ?>
<map>
<string name="username">Rishabh</string>
<boolean name="logged_in" value="true" />
</map>

retrieving data

SharedPreferences pref = getSharedPreferences("MyPrefs", Context.MODE_PRIVATE);

String username = pref.getString("username", "");
boolean logged_in = String.valueOf(pref.getBoolean("logged_in", false);

Log.d(TAG, username);
Log.d(TAG, String.valueOf(logged_in));

deleting data

// Remove a particular key
pref.remove("username");

// Commit changes
pref.commit();

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