JavaClassWrapper.wrap() doesn't seem to work

[FeralBytes]

Basically JavaClassWrapper.wrap() has never worked. But it is tempting for people trying to get access to Android Classes. I did manage to the the java classes from the function by returning the correct value a modification I made to Godot code. But even then, it seems that the class deletes too many references which makes the Java Class holo which is still useless.
I think it could work great as the kivy project has something similiar in pyjinus.
I would like to get this to work, but I need help because I do not know C++ much at all.

Godot version:
ALL

OS/device including version:
Android

Issue description:
JavaClassWrapper.wrap() returns [Object:null]
After patch it returns [JavaClass] but it seems to be holo, no class methods or class variables.

Some proof that JavaClassWrapper.wrap() is actually getting a class from the JNI.

[KoBeWi]

Can anyone still reproduce this bug in Godot 3.2.1 or any later release (e.g. 3.2.2-rc2)?

[zeze0556]

Can anyone still reproduce this bug in Godot 3.2.1 or any later release (e.g. 3.2.2-rc2)?

我写了一个补丁来实现这一功能，允许使用JavaClassWrapper.wrap调用任意的java类，以及和android/modules互相调用，java类可以使用 class.new的方式生成实例

比如：

var singleton = null
var rixnet = null;


func test_java_singleton():
	var c_java = JavaClassWrapper.wrap("com/godot/game/testJava");
	print("c_java==", c_java)
	var c_test  = c_java.initialize();
	print("c_test=", c_test);
	print("c_test kk^=", c_test.myFunction("in GD"))
	
func test_singleton():
	rixnet = Engine.get_singleton("RixNet")
	print("rixnet=", rixnet);
	rixnet.connect("test.net", 5000, 1);
	var test_packet = rixnet.getPacket();
	print("test_packet= ", test_packet)
	print("test_packet cmd=", test_packet.getCmd());
	print("test_packet buf", test_packet.getBuf());
	singleton = Engine.get_singleton("MySingleton")
	print(singleton.myFunction("Hello"))
	singleton.getInstanceId(get_instance_id())
	
func test_java():
	test_singleton()
	var java_c = JavaClassWrapper.wrap("com/godot/game/testJava2")
	var java_packet = JavaClassWrapper.wrap("com/rix/lib/socket/Packet")
	print("java_c = ", java_c)
	var new_java = java_c.new()
	print("new_java=", new_java)
	print("new_java myFunction=", new_java.myFunction("GDTEST"))
	print("new_java testString=", new_java.testString())
	print("new_java testStringWithArgs=", new_java.testStringWithArgs("fff", 123))
	var p = java_packet.new(10, 2, PoolByteArray([0xF,0xE,0xD,0xC,0xB,0xA,9,8,7,6,5,4,3,2,1,0]), 2)
	print("packet=",p)
	print("new_java testPacket", new_java.testPacket(3, p))
	print("new_java testPacket 2", new_java.testPacket(2, p))
	print("packet2=",p)
	print("rix_net send=", rixnet.sendmessage(p))

func _ready():
	test_java()

java_source:
test_java_src.zip

patch:
godot_android_classwrap.zip

[Mickeon]

It's been years and I am still unsure on whether or not JavaClass and JavaClassWrapper do anything useful as exposed classes. Examples and actual use-cases are lacking.