What is a preference fragment?
What is a preference fragment?
In Android apps, there are often settings pages that contain different options the user can tweak. The PreferenceFragment and PreferenceFragmentCompat contains a hierarchy of preference objects displayed on screen in a list. These preferences will automatically save to SharedPreferences as the user interacts with them.
How do I use PreferenceFragment?
4 Answers
- Add a dependency for support of preference fragment in build.gradle file for app module: dependencies { compile ‘com.android.support:preference-v7:25.1.0’ }
- Add xml Android resource directory inside res directory.
- Add a new Java class named SettingsFragment which will host PreferenceScreen .
How are preferences saved to an xml file?
The preferences are saved by the android. content. SharedPreferences class to an XML file that contains pairs of key-value; the values can be booleans, floats, ints, longs or strings.
What is preference xml?
xml. The preferences. xml file stores user preferences and the database connection for the Data Validation Option repository. Each user has a separate preferences file.
How do you use Listfragment?
You must use ListFragment. setListAdapter() to associate the list with an adapter. Do not directly call ListView. setAdapter() or else important initialization will be skipped….
| Public methods | |
|---|---|
| void | setSelection(int position) Set the currently selected list item to the specified position with the adapter’s data |
How do I get support fragment manager?
How to use getSupportFragmentManager method in android. support. v4. app. FragmentActivity
- Fragment fragment;fragment.getActivity()
- Robolectric.buildActivity(FragmentActivity.class).create().get()
What is Preferencescreen in Android?
Represents a top-level Preference that is the root of a Preference hierarchy. A PreferenceActivity points to an instance of this class to show the preferences. To instantiate this class, use PreferenceManager#createPreferenceScreen(Context) .
What is a ListFragment?
A fragment that displays a list of items by binding to a data source such as an array or Cursor, and exposes event handlers when the user selects an item. ListFragment hosts a ListView object that can be bound to different data sources, typically either an array or a Cursor holding query results.
How do I programatically handle preferences in a fragment?
Use PreferenceFragmentCompat to programatically handle preferences. To load the settings into the fragment, load the preferences in the onCreatePreferences() method. To get an instance of a preference, search for a preference using its key through the PreferenceManager within onCreateView().
What are sharedpreferences and preferencefragments?
In Android apps, there are often settings pages that contain different options the user can tweak. The PreferenceFragment and PreferenceFragmentCompat contains a hierarchy of preference objects displayed on screen in a list. These preferences will automatically save to SharedPreferences as the user interacts with them.
How do I retrieve preferences saved in sharedpreferences?
All preferences are saved as key-value pairs in the default SharedPreferences with the key specified through the xml above. To retrieve an instance of those preferences, call the following with a context in the same package as the fragment: The root for the XML file must be a .
Is the preferencefragment compatible with Android support V4?
Note, however, that the PreferenceFragment is NOT compatible with Android support v4. For alternatives: Marshmallow and above: The support v7 library introduced the PreferenceFragmentCompat. We’ll be using this for the rest of the tutorial. Open your app’s gradle file ( Your-Project/app/build.gradle) and add the following to the dependencies:
