onUpdate is called twice

I observed that `onUpdate` is called twice in my views. I don't understand why and the solutions I could come up with are

have a switch that remember if it was already called see https://github.com/individual-it/BatteryGuesstimate/pull/4
have a global `_dc as Dc` that is set from `onLayout()` and do the whole drawing in `onShow()`

but both does not sound right.

Any other solutions, or even maybe an explanation why `onUpdate()` is called twice?

5262988 over 2 years ago in reply to _psx_

I already saw what was my mistake, I wasn't "update" the

globalIsRecSession = Storage.getValue("isReSession"); on the delegate.mc

lets see if I'm doing it the right way:

app.mc

import ..
....


public var globalIsRecSession = Storage.getValue("isReSession");

class teste4App extends Application.AppBase {


delegate.mc

function OnSelect....
 if (....) 
Storage.setValue("isReSession", true);
globalIsRecSession = Storage.getValue("isReSession");

view.mc

onUpdate()
if(globalIsRecSession) is working :D

_psx_ over 2 years ago in reply to 5262988

in my opinion should be

delegate.mc-------------------

var globalIsRecSession;//default null so do nothing

function OnSelect....
if (....)
globalIsRecSession = true;

view.mc-----------------------

onUpdate()
if(globalIsRecSession)

it's enough, no storage operation at all because if you start app again you can't use globalIsRecSession from previous app session

5262988 over 2 years ago in reply to _psx_

make sense. thanks ;)

jim_m_58 over 2 years ago in reply to 5262988

very simple case:

var myVar=false;

class MyView extends WatchUi.View {

    //..other stuff
    function onUpdate(dc) {
        //..other stuff
        if(myVar) {
        
        } else {
        
        }
        //..other stuff
    }
    
}

class MyDelegate extends WatchUi.BehaviorDelegate {
    //..other stuff

    function onMenu() {
        myVar=!myVar;
        WatchUi.requestUpdate();
        return true;
    }
}

Each time the menu key is pressed. myVar toggles state in the delegate, and is used in onUpdate right away. No storage involved.

5262988 over 2 years ago in reply to 5262988

ok, without storage do you think onUpdate every second is good or bad for battery?

5262988 over 2 years ago in reply to jim_m_58

thanks! in SDK are some example about what I want to do? save information to show on connect iq? thanks!

_psx_ over 2 years ago in reply to 5262988

if data can change every second you should draw every second if every hour every hour, you don't need to force drawing (by calling requireUpdate) if you know that data on screen is good (system should call onUpdate when it knows you should redraw screen (e.g. after onShow)

jim_m_58 over 2 years ago in reply to 5262988

Using Storage for this is a bad idea. No ifs, ands or buts.

jim_m_58 over 2 years ago in reply to 5262988

You are talking about fitContrib which is very different than Storage.