Android Question Reverse timer

GymReaper said:

Redone in B4A - Take into account Erel's comments about timers though

B4X:

Sub Process_Globals
    'These global variables will be declared once when the application starts.
    'These variables can be accessed from all modules.
    Private xui As XUI
   
    Dim tmrCountdown As Timer
    Dim tmrSeconds As Int

End Sub

Sub Globals
    'These global variables will be redeclared each time the activity is created.
    Private Button1 As B4XView
    Private Label1 As B4XView
   
End Sub

Sub Activity_Create(FirstTime As Boolean)
    Activity.LoadLayout("Layout")
   
    tmrCountdown.Initialize("tmr",1000)
    tmrCountdown.Enabled=False
End Sub

Sub Activity_Resume

End Sub

Sub Activity_Pause (UserClosed As Boolean)

End Sub

Sub Button1_Click
   
    tmrSeconds=30
   
    tmrCountdown.Enabled = True

End Sub

Sub tmr_tick
   
    tmrSeconds=tmrSeconds-1
    Label1.Text= tmrSeconds
   
    If tmrSeconds=0 Then tmrCountdown.Enabled=False
   
End Sub

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rezaghasmi said:

I use b4a Then writing CountDown becomes a red line

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rezaghasmi said:

After execution, the code leaves the page


java.lang.IllegalStateException: Interval must be larger than 0.
at anywheresoftware.b4a.objects.Timer.setEnabled(Timer.java:79)
at b4a.example.rgeg._activity_create(rgeg.java:482)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:191)
at b4a.example.rgeg.afterFirstLayout(rgeg.java:104)
at b4a.example.rgeg.access$000(rgeg.java:17)
at b4a.example.rgeg$WaitForLayout.run(rgeg.java:82)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:224)
at android.app.ActivityThread.main(ActivityThread.java:7561)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:539)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:995)

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tmrCountdown.Initialize("tmr",1000)

Erel said:

The code I posted is a bit better.
1. It is very simple.
2. It is more accurate. Timers will never be 100% accurate as they run on the main thread. If the program is busy doing other stuff the counter will lag. With my code it will always stay accurate.

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LucaMs said:

3. Does not need a global variable (the counter).

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GymReaper said:

Erel really is a genius

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