Type Function Library system.* Return value various Revision 2017.3060 Keywords system preference, getPreference See also system.deletePreferences() system.setPreferences()
Returns the requested preference's value.
This function will return nil if the requested preference was not found, or if its value could not be converted to the requested value type such as "boolean", "number", or "string".
On iOS, the "ui" language is set in the "locale" parameters are set in the Region field on the same screen.
On Android, system.getPreference( "ui", "language" )English instead of en.
In the Corona Simulator for Windows, the value returned by system.getPreference( "ui", "language" )
Windows Phone does not support the "app" category and cannot store the Corona developer's custom application preferences.
system.getPreference( category, name [, type] )
String. Indicates where to read preferences from. Must be set to one of the following:
"app" — The application's custom preferences. These are defined by the Corona app developer."locale" — Accesses the operating system's "ui" — Accesses the operating system's String. The unique name of the preference to read, depending on the category used:
"app" — A preference name written to storage by the Corona app developer via the system.setPreferences() function."locale" — Only supports preference names "country", "identifier", and "language"."ui" — Only supports preference name "language".String. Indicates the value type to be returned by this function. This type should match the preference value's type on storage. For example, all preferences belonging to the "locale" and "ui" categories are stored as strings and should be read as strings, while types for the "app" category should match the value types passed to the system.setPreferences() function. Accepted values include:
"string" (default)"boolean""number"-- Print the operating system's read-only preferences
print( system.getPreference( "ui", "language" ) ) -- Print the UI (device) language, i.e. "en-US"
print( system.getPreference( "locale", "country" ) ) -- Print the locale country, i.e. "US"
print( system.getPreference( "locale", "identifier" ) ) -- Print the locale language identifier, i.e. "en_US"
print( system.getPreference( "locale", "language" ) ) -- Print the locale language code, i.e. "en"
-- Write this app's custom preferences to storage
local appPreferences =
{
myBoolean = true,
myNumber = 123.45,
myString = "Hello World"
}
system.setPreferences( "app", appPreferences )
-- Read the preferences that were written to storage above
local myBoolean = system.getPreference( "app", "myBoolean", "boolean" )
local myNumber = system.getPreference( "app", "myNumber", "number" )
local myString = system.getPreference( "app", "myString", "string" )