Android Question How to use JavaObject (or reflector) with ViewPropertyAnimator

moster67 · Aug 8, 2016

Someone who can help to show me how to use ViewPropertyAnimator with JavaObject or Reflector (if it is possible).

Example in Java:

B4X:

private Button mButton;
mButton.animate().rotationBy(360.0f).setDuration(5000).start();

Thanks.

DonManfred · Aug 8, 2016

i guess you need to get a ref to https://developer.android.com/reference/android/view/ViewPropertyAnimator.html
and then work with it´s methods...

moster67 · Aug 8, 2016

Thank you Don but I was thinking of doing something as follows:

B4X:

Dim Obj1 As Reflector
Obj1.Target = myButton
Obj1.RunMethod("animate")
Obj1.RunMethod2("rotationBy",360.0f, "java.lang.float")
Obj1.RunMethod2("setDuration",5000, "java.lang.int")
Obj1.RunMethod("start")

but this will not work.

I can probably use inline-java or one of the plenty animations libraries available but I wanted to get it working either with Reflector or JavaObject (or a combination of both if necessary).

DonManfred · Aug 8, 2016

I guess you need to get an reference to the animator. initializestatic or so?
with the animator then you can use the methods you posted in post#1 i guess.

Sorry, i´m not really familar with JO

moster67 · Aug 8, 2016

DonManfred said:
Sorry, i´m not really familar with JO

Neither am I
Thanks anyway!

Erel · Aug 8, 2016

B4X:

Sub Rotate(view As View, Degree As Float, Duration As Long)
Dim jo As JavaObject = view
jo.RunMethodJO("animate", Null).RunMethodJO("rotationBy", Array(Degree)).RunMethodJO("setDuration", Array(Duration)).RunMethodJO("start", Null)
End Sub

moster67 · Aug 8, 2016

Seeing the code required, it was much simpler than I thought
Thank you Erel.

LucaMs · Feb 13, 2017

Erel said:

B4X:

Sub Rotate(view As View, Degree As Float, Duration As Int)
Dim jo As JavaObject = view
jo.RunMethodJO("animate", Null).RunMethodJO("rotationBy", Array(Degree)).RunMethodJO("setDuration", Array(Duration)).RunMethodJO("start", Null)
End Sub

I get this error:
java.lang.RuntimeException: Method: setDuration not matched.

B4X:

Sub Activity_Resume
    Rotate(pnlGreen, 30, 1000)
End Sub

Erel · Feb 13, 2017

The code was wrong. Duration type should be Long.

LucaMs · Feb 13, 2017

Erel said:
The code was wrong. Duration type should be Long.

I know and tried but it does not work

LucaMs · Feb 13, 2017

LucaMs said:
I know and tried but it does not work

I tried but very badly

First attempt was using a float, then I declared the argument as Float; same error.

Then I passed a Long, without change the "signature".

Sorry, thank you Erel.

Erel · Feb 13, 2017

Works fine here. Are you testing it on Android 4+ device?

Android Question How to use JavaObject (or reflector) with ViewPropertyAnimator

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