Android Question Set function for object

coldteam said:

I know that in java you can put a link to a function in a variable and call it.

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For Each Obj As Object In MyObjects
 CallSub2(Obj, "Draw", Parameter)
Next

Erel said:

This is similar to using CallSub, no?

You can also create different classes with the same "template" and call it with CallSub like this:

B4X:

For Each Obj As Object In MyObjects
CallSub2(Obj, "Draw", Parameter)
Next

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Sub drawBox_small (box as type_box)

Sub drawBox_medium (box as type_box)

Sub drawBox_big (box as type_box)

type type_box(name as string)

Dim box1 as type_box
box1.name = small

Dim box2 as type_box
box2.name = medium

Dim box3 as type_box
box3.name = big

For each box as type_box in BoxList
callsub2(me,"drawBox_" & box.name,box)
next

Erel said:

Please use [code]code here...[/code] tags when posting code.

Have you tested it in release mode and found that there is a performance problem?

60 times per second is a very very slow rate.

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someVar = <getName() method>;
String value = someVar.call();

 private String getName() {
     return "hello";
 }

Erel said:

Have you tested it in release mode and found that there is a performance problem?

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Erel said:

This is called preoptimization. You should start with the simplest solution and if needed optimize it.
The number of methods will not affect the performance. Test it with a few methods. If it is fast enough then forget from this.

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Erel said:

There is no such thing in Java. You can call methods by their names but it is more complicated and eventually it will be very similar to using CallSub (if you do it correctly and efficiently).

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Erel said:

This is called preoptimization

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Sandman said:

And just to spell it out: Premature optimization is considered a bad thing. There are lots and lots of pages on the interwebs about this, but here's a short section on Wikipedia on the topic.

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Erel said:

As I see it, the relevant question is:

Q: How does the number of subs affect the performance of CallSub?
A: It doesn't (not talking about millions of subs of course).

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