Android Question JSTouchImageView and x y positions

Sub imgViewPlanimetria_OnItemClick
   
    Dim rTI As Reflector, rGD As Reflector
    rTI.Target=imgViewPlanimetria
    Dim mGD As JavaObject = rTI.GetField("mGestureDetector")
    rGD.Target=mGD
    Dim ptX As Object = rGD.GetField("mDownFocusX")
    Dim ptY As Object = rGD.GetField("mDownFocusY")
    Dim aPointObject As JavaObject = rTI.RunMethod4("transformCoordTouchToBitmap", _
            Array As Object(ptX,ptY,False), Array As String("java.lang.float", _
            "java.lang.float","java.lang.boolean"))
    Dim x, y As Float
    x = aPointObject.getfield("x")
    y = aPointObject.getfield("y")
    Log(x)
    Log(y)
   
End Sub

planimetria_touchimage_onitemclick (java line: 520)
java.lang.NoSuchFieldException: No field mDownFocusX in class Landroid/view/GestureDetector; (declaration of 'android.view.GestureDetector' appears in /system/framework/framework.jar!classes2.dex)
    at java.lang.Class.getDeclaredField(Native Method)
    at anywheresoftware.b4a.agraham.reflection.Reflection.GetField(Reflection.java:316)
    at com.app.regant.planimetria._touchimage_onitemclick(planimetria.java:520)
    at java.lang.reflect.Method.invoke(Native Method)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:213)
    at anywheresoftware.b4a.BA$1.run(BA.java:352)
    at android.os.Handler.handleCallback(Handler.java:873)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:193)
    at android.app.ActivityThread.main(ActivityThread.java:6669)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)