Shared Preferences allows activities and applications to keep preferences, in the form of key-value pairs similar to a Map that will persist even when the user closes the application. #Android studio preference manager get context android#Īndroid stores Shared Preferences settings as XML file in shared_prefs folder under DATA/data/ directory. The DATA folder can be obtained by calling Environment.getDataDirectory(). SharedPreferences is application specific, i.e. To get access to the preferences, we have three APIs to choose from: on clearing the application data (through Settings)Īs the name suggests, the primary purpose is to store user-specified configuration details, such as user specific settings, keeping the user logged into the application.the data is lost on performing one of the following options: getDefaultSharedPreferences() : used on the PreferenceManager, to get the shared preferences that work in concert with Android’s overall preference framework.getSharedPreferences() : used from within your Activity (or other application Context), to access application-level preferences.getPreferences() : used from within your Activity, to access activity-specific preferences. In this tutorial we’ll go with getSharedPreferences(). When it is set, it would enable write ahead logging by default MODE_ENABLE_WRITE_AHEAD_LOGGING: Database open flag.MODE_APPEND: This will append the new preferences with the already existing preferences.MODE_MULTI_PROCESS: This method will check for modification of preferences even if the Shared Preference instance has already been loaded.MODE_WORLD_WRITEABLE: Creating world-writable files is very dangerous, and likely to cause security holes in applications.MODE_WORLD_READABLE: Creating world-readable files is very dangerous, and likely to cause security holes in applications.MODE_PRIVATE: the default mode, where the created file can only be accessed by the calling application.Following are the operating modes applicable: The method is defined as follows: getSharedPreferences (String PREFS_NAME, int mode) PREFS_NAME is the name of the file. We need an editor to edit and save the changes in shared preferences. The following code can be used to get the shared preferences. #Android studio preference manager get context code# Pref.getBoolean("key_name", null) // getting boolean Pref.getLong("key_name", null) // getting Long Pref.getFloat("key_name", null) // getting Float Pref.getInt("key_name", -1) // getting Integer editor.putBoolean("key_name", true) // Storing boolean - true/falseĮditor.putString("key_name", "string value") // Storing stringĮditor.putInt("key_name", "int value") // Storing integerĮditor.putFloat("key_name", "float value") // Storing floatĮditor.putLong("key_name", "long value") // Storing longĭata can be retrieved from saved preferences by calling getString() as follows: pref.getString("key_name", null) // getting String SharedPreferences pref = getApplicationContext().getSharedPreferences("MyPref", 0) // 0 - for private modeĮmit() is used in order to save changes to shared preferences. clear() is used to remove all data editor.remove("name") // will delete key nameĮditor.remove("email") // will delete key email Remove(“key_name”) is used to delete that particular value. The activity_main.xml layout consists of two EditText views which store and display name and email. #Android studio preference manager get context code#. ![]() #Android studio preference manager get context android#.The method tDefaultValues(.) basically stores a boolean key KEY_HAS_SET_DEFAULT_VALUES ( = "_has_set_default_values") in a separate SharedPreferences file of the same name after setting defaultValues from the specified xml.
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