Adobe Flash Professional CS3 Bedienungsanleitung PDF herunterladen (Seite 505)

FLASH CS3

User Guide

499

• Limittheuseofglobalvariables,becausetheyarenotmarkedforgarbagecollectionifthemovieclipthatdefined

them is removed.

• Avoid using the standard user interface components (available in the Components panel in Flash). These compo-

nents are designed to run on desktop computers and are not optimized to run on mobile devices.

• Whenever possible, avoid deeply nested functions.

• Avoid referencing nonexistent variables, objects, or functions. Compared to the desktop version of Flash Player,

Flash Lite 2 looks up references to nonexistent variables slowly, which can significantly affect performance.

• Avoid defining functions using anonymous syntax. For example, myObj.eventName = function{ ...}.

Explicitly defined functions are more efficient, such as

function myFunc { ...}; my Obj.eventName =

myFunc;.

• Minimize the use of Math functions and floating-point numbers. Calculating these values slows performance. If

you must use the Math routines, consider precalculating the values and storing them in an array of variables.

Retrieving the values from a data table is much faster than having Flash calculate them at run time.

For more tips and techniques for creating content for mobile phones and devices, see

www.adobe.com/go/learn_cs_mobilewiki_en.

Managing Flash Lite file memory for mobile devices

Flash Lite regularly clears from memory any objects and variables that a file no longer references. This is known as

garbage collection. Flash Lite runs its garbage-collection process once every 60 seconds, or whenever usage of file

memory increases suddenly by 20% or more.

Although you cannot control how and when Flash Lite performs garbage collection, you can still free unneeded

memory deliberately. For timeline or global variables, use the

delete statement to free the memory that Action-

Script objects use. For local variables—for example, a variable defined within a function definition—you can’t use

the

delete statement to free an object’s memory, but you can set to null the variable that references the object. This

frees the memory that the object uses, provided there are no other references to that object.

Thefollowingtwocodeexamplesshowhowtofreememorythatobjectsusebydeletingthevariablethatreferences

those objects. The examples are identical, except that the first example creates a timeline variable and the second

creates a global variable.

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Adobe Flash Professional CS3 Bedienungsanleitung Seite 505