Shared Prefrence

        Save And Load User Preferences

Android provides the SharedPreferences object to help you save simple application data.

Using the SharedPreferences object, you save the data you want through the use of name/value pairs.

In the following code, you learn how to use the SharedPreferences object to store application data.

Example

Create a file at res/xml/myapppreferences.xml and populate the myapppreferences.xml file as follows:

         <?xml version="1.0" encoding="utf-8"?>
         <PreferenceScreen
             xmlns:android="http://schemas.android.com/apk/res/android">
             <PreferenceCategory android:title="Category 1">
                 <CheckBoxPreference
                     android:title="Checkbox"
                     android:defaultValue="false"
                     android:summary="True or False"
                     android:key="checkboxPref" />
                 </PreferenceCategory>
             <PreferenceCategory android:title="Category 2">
                 <EditTextPreference
                     android:summary="Enter a string"
                     android:defaultValue="[Enter a string here]"
                     android:title="Edit Text"
                     android:key="editTextPref" />
                 <RingtonePreference
                     android:summary="Select a ringtone"
                     android:title="Ringtones"
                     android:key="ringtonePref" />
                 <PreferenceScreen
                     android:title="Second Preference Screen"
                  android:summary= "Click here to go to the second Preference Screen"
                  android:key="secondPrefScreenPref" >
                  <EditTextPreference
                      android:summary="Enter a string"
                      android:title="Edit Text (second Screen)"
                      android:key="secondEditTextPref" />
              </PreferenceScreen>
          </PreferenceCategory>
      </PreferenceScreen>

Java code

import android.os.Bundle;
import android.preference.PreferenceActivity;

public class AppPreferenceActivity extends PreferenceActivity {
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         //load the preferences from an XML file
         addPreferencesFromResource(R.xml.myapppreferences);
     }
}

Note

Once you have modified the value of at least one of the preferences, a file is created in the /data/data/activity name/shared_prefs folder of the Android emulator.

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