Android Preferences
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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.
Android Preferences
- 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.
- 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.
- 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.
- 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 https://play.google.com/store/apps/developer?id=RADJAB http://gplus.to/radjab http://www.fb.me/rajab.davudov http://www.linkedin.com/in/radjab