Provides access to the Java Native Interface.
The JavaClassWrapper singleton provides a way for the Godot application to send and receive data through the [url=https://developer.android.com/training/articles/perf-jni]Java Native Interface[/url] (JNI). [b]Note:[/b] This singleton is only available in Android builds. [codeblock] 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)) [/codeblock] [b]Warning:[/b] When calling Java methods, be sure to check [method JavaClassWrapper.get_exception] to check if the method threw an exception.
$DOCS_URL/tutorials/platform/android/javaclasswrapper_and_androidruntimeplugin.html
Creates a [JavaObject] implementing the given Java interfaces using the given [Object] as the implementation. The [param object] must contain methods signatures matching the methods signatures from the passed Java [param interfaces]. Invoking methods from the Java [param interfaces] will route to the matching [param object] method. [codeblock] class PrintProxy: func println(content: String) -> void: print(content)

var print_proxy = PrintProxy.new() var printer_object = JavaClassWrapper.create_proxy(print_proxy, ["android.util.Printer"]) printer_object.println("Hello Godot World!") [/codeblock] [b]Note:[/b] This method only works on Android. On every other platform, this method will always return [code]null[/code].
Creates a [JavaObject] implementing the Java Single Abstract Method (SAM) interface using the Godot [Callable] as the implementation. The [param sam_interface] [b]must be[/b] a Java SAM interface, meaning it must only have a single abstract method to implement. The [param callable] must be able to handle the same parameter types as the SAM interface method, and must provide the same return type. The [param callable] will be invoked as a callback, passing the arguments from the Java SAM interface method. [codeblock] var cb = func (content: String) -> void: print(content) var callback = JavaClassWrapper.create_sam_callback("android.util.Printer", cb) callback.println("Hello Godot World!") [/codeblock] [b]Note:[/b] This method only works on Android. On every other platform, this method will always return [code]null[/code].
Returns the Java exception from the last call into a Java class. If there was no exception, it will return [code]null[/code]. [b]Note:[/b] This method only works on Android. On every other platform, this method will always return [code]null[/code].
Wraps a class defined in Java, and returns it as a [JavaClass] [Object] type that Godot can interact with. When wrapping inner (nested) classes, use [code]$[/code] instead of [code].[/code] to separate them. For example, [code]JavaClassWrapper.wrap("android.view.WindowManager$LayoutParams")[/code] wraps the [b]WindowManager.LayoutParams[/b] class. [b]Note:[/b] To invoke a constructor, call a method with the same name as the class. For example: [codeblock] var Intent = JavaClassWrapper.wrap("android.content.Intent") var intent = Intent.Intent() [/codeblock] [b]Note:[/b] This method only works on Android. On every other platform, this method does nothing and returns an empty [JavaClass].