{"id":163,"date":"2016-06-22T07:51:15","date_gmt":"2016-06-22T07:51:15","guid":{"rendered":"https:\/\/wp.local\/?p=163"},"modified":"2016-06-23T05:56:16","modified_gmt":"2016-06-23T05:56:16","slug":"multi-language-support-and-spinnerpreference-part-ii","status":"publish","type":"post","link":"https:\/\/blog.c-devtech.net\/?p=163","title":{"rendered":"Multi-Language support and SpinnerPreference – Part II"},"content":{"rendered":"

As mentioned in Part I<\/a>, calling updateConfiguration<\/em> with the correct parameters for the locale provides a simple way to switch the language used in an app. Of course, the app should always start with the language last selected by the user and should provide an easy method with which to change the displayed language.<\/p>\n

Saving state in an Android app can take many forms. For short term, such as handling orientation changes, using savedInstanceState<\/a> in onCreate <\/em>or a Headless Retained Fragment <\/a> works very well. However these methods are not appropriate for user settings which require a persistent storage that spans the app restarting not just the activity. For this type of storage in Android there is a built-in database, SQLite<\/a>, the file system<\/a>, or SharedPreferences<\/a>, which I ended up selecting since I was going to use a PreferenceFragment<\/a> for my user settings interface.<\/p>\n

To implement a PreferenceFragment<\/strong> create a SettingsActivity <\/em>which extends AppCompatActivity <\/em>and include the innerClass – MyPreferenceFragmen<\/em>t which extends the PreferenceFragment <\/em>and loads the xml file that defines the preferences.<\/p>\n

public class SettingsActivity extends AppCompatActivity {\r\n\r\n    @Override\r\n    public void onCreate(Bundle savedInstanceState) {\r\n        super.onCreate(savedInstanceState);\r\n\r\n        setContentView(R.layout.activity_settings);\r\n\r\n        getFragmentManager().beginTransaction().replace(\r\n                R.id.content_frame, \r\n                new MyPreferenceFragment()).commit();\r\n    }<\/pre>\n
public static class MyPreferenceFragment extends PreferenceFragment{\r\n    @Override\r\n    public void onCreate(final Bundle savedInstanceState) {\r\n        super.onCreate(savedInstanceState);\r\n\r\n        \/\/ Define the xml file used for preferences\r\n        addPreferencesFromResource(R.xml.preferences);\r\n    }\r\n}<\/pre>\n
The activity_settings.xml<\/em> file is very simple and is used as the fragment container:<\/p>\n
<?xml version=\"1.0\" encoding=\"utf-8\"?>\r\n<FrameLayout xmlns:android=\r\n        \"http:\/\/schemas.android.com\/apk\/res\/android\"\r\n    android:id=\"@+id\/content_frame\"\r\n    android:layout_width=\"match_parent\"\r\n    android:layout_height=\"match_parent\">\r\n<\/FrameLayout><\/pre>\n
The preferences.xml<\/em> file provides the layout for the PreferenceScreen<\/a>. The built-in widgets available for the preference screen are: CheckBoxPreference<\/a>, ListPreference <\/a>and EditTextPreference<\/a>. In part III, we’ll add a widget that’s very useful for selecting an item from a list, the SpinnerPreference<\/strong>.<\/p>\n","protected":false},"excerpt":{"rendered":"
As mentioned in Part I, calling updateConfiguration with the correct parameters for the locale provides a simple way to switch the language used in an app. Of course, the app should always start with the language last selected by the … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_hide_featured_image":false,"_jetpack_featured_image_duplicate_dismissed":0,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[8],"tags":[],"class_list":["post-163","post","type-post","status-publish","format-standard","hentry","category-android-app-develoment"],"jetpack_publicize_connections":[],"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p1IEK3-2D","jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/blog.c-devtech.net\/index.php?rest_route=\/wp\/v2\/posts\/163","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.c-devtech.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.c-devtech.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.c-devtech.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.c-devtech.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=163"}],"version-history":[{"count":7,"href":"https:\/\/blog.c-devtech.net\/index.php?rest_route=\/wp\/v2\/posts\/163\/revisions"}],"predecessor-version":[{"id":178,"href":"https:\/\/blog.c-devtech.net\/index.php?rest_route=\/wp\/v2\/posts\/163\/revisions\/178"}],"wp:attachment":[{"href":"https:\/\/blog.c-devtech.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=163"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.c-devtech.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=163"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.c-devtech.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=163"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}