JavaClassWrapper

Inherits: Object

Provides access to the Java Native Interface.

Description

The JavaClassWrapper singleton provides a way for the Redot application to send and receive data through the Java Native Interface (JNI).

\ Note: This singleton is only available in Android builds.

    var LocalDateTime = JavaClassWrapper.wrap("java.time.LocalDateTime")
    var DateTimeFormatter = JavaClassWrapper.wrap("java.time.format.DateTimeFormatter")

    var datetime = LocalDateTime.now()
    var formatter = DateTimeFormatter.ofPattern("dd-MM-yyyy HH:mm:ss")

    print(datetime.format(formatter))

\ Warning: When calling Java methods, be sure to check get_exception() to check if the method threw an exception.

Tutorials

• Integrating with Android APIs

Methods

JavaObject	get_exception\ (\ )
JavaClass	wrap\ (\ name: String\ )

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Method Descriptions

JavaObject get_exception\ (\ ) 🔗

Returns the Java exception from the last call into a Java class. If there was no exception, it will return null.

\ Note: This method only works on Android. On every other platform, this method will always return null.

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JavaClass wrap\ (\ name: String\ ) 🔗

Wraps a class defined in Java, and returns it as a JavaClass Object type that Redot can interact with.

When wrapping inner (nested) classes, use $ instead of . to separate them. For example, JavaClassWrapper.wrap("android.view.WindowManager$LayoutParams") wraps the WindowManager.LayoutParams class.

\ Note: To invoke a constructor, call a method with the same name as the class. For example:

    var Intent = JavaClassWrapper.wrap("android.content.Intent")
    var intent = Intent.Intent()

\ Note: This method only works on Android. On every other platform, this method does nothing and returns an empty JavaClass.