The document discusses the importance of preferences in allowing Android users to personalize applications and outlines different types of preferences like checkboxes, lists, and edit texts that can store user selections. It also provides code examples for defining preferences in XML and accessing preference values programmatically using SharedPreferences. The document is intended to teach developers how to incorporate preferences into their Android applications.

1. Rajab Davudov

2. Preferences are Important
• Preferences are an important part of an
Android application. It is important to let
the users have the choice to modify and
personalize their application depending
on their needs.

3. Preferences are Important

4. How To
• res/xml/preferences.xml
• an Activity extends PreferenceActivity

5. Preference Types
• The CheckBoxPreference is a simple checkbox, that can return
true or false.
• The ListPreference, which shows a radioGroup where only 1
item can be selected a time.
• The EditTextPreference shows a dialog with an editText view
which returns a String.

6. Preference Types

7. Preference Types
• The RingtonePreference shows a radioGroup that shows the
ringtones.
• The Preference is a custom preference.
• The PreferenceScreen is a screen with preferences. When you
have a PreferenceScreen inside an other PreferenceScreen, it
simply opens a new screen with other preferences.

8. Preference Types

9. CheckBoxPreference
<CheckBoxPreference
android:title="Checkbox Preference"
android:defaultValue="false"
android:summary="This preference can be true or false"
android:key="checkboxPref" />

10. ListPreference
<ListPreference
android:title="List Preference"
android:summary="This preference allows to select an item in a array"
android:key="listPref"
android:defaultValue="digiGreen"
android:entries="@array/listArray"
android:entryValues="@array/listValues" />

11. Use Preferences
SharedPreferences sp =
PreferenceManager.getDefaultSharedPreferences(this);
boolean checked = sp.getBoolean("checkBox", true) ;
String s = sp.getString("radioButton", "default") ;

12. Think, Design, Code !!!

13. Rajab Davudov
Senior Developer at Azerfon
radjab@gmail.com
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