Android Question JavaObject

#AdditionalJar:irlib-release.aar
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Hi from a third-party library I have to read data from a device.
this is the code

Dim battery, memtot, memused, nfile As Int
Dim sn, version As String
Dim temperature As Float

Dim ctxt As JavaObject
ctxt.InitializeContext
Dim handler As JavaObject
handler.InitializeNewInstance("android.os.Handler", Null)
irh.InitializeNewInstance("com.rft.irlib.IrHandler", Array(ctxt, handler))

battery = irh.RunMethod("GetBattery", Null)
Log("Battery: " & battery)

memtot = irh.RunMethod("GetMemTot", Null)
Log("MemTot: " & memtot)

memused = irh.RunMethod("GetMemUsed", Null)
Log("MemUsed: " & memused)

nfile = irh.RunMethod("GetNFile", Null)
Log("NFile: " & nfile)

sn = irh.RunMethod("GetSN", Null)
Log("SN: " & sn)

version = irh.RunMethod("GetVersion", Null)
txtVersione.Text=version
Log("Version: " & version)

temperature = irh.RunMethod("GetTemperature", Null)
Log("Temperature: " & temperature)


int GetBattery()
int GetMemTot()
int GetMemUsed()
int GetNFile()
java.lang.String GetSN()
float GetTemperature()
java.lang.String GetVersion()

No result
Thank you