AIR 文件类型过滤

主要是browseForOpenMultiple第二个参数的使用，没啥好说的

import flash.filesystem. *;
import flash.events.FileListEvent;
var docsDir :File = File.documentsDirectory;
var _allFF :FileFilter = new FileFilter( "*.bmp;*.jpeg;*.jpg;*.png", "*.bmp;*.jpeg;*.jpg;*.png");
var _bmpFF :FileFilter = new FileFilter( "*.bmp", "*.bmp");
var _jpgFF :FileFilter = new FileFilter( "*.jpg", "*.jpg");
var _jpegFF :FileFilter = new FileFilter( "*.jpeg", "*.jpeg");
var _pngFF :FileFilter = new FileFilter( "*.png", "*.png");
try {
 docsDir.browseForOpenMultiple( "选择图像文件",[_allFF,_bmpFF,_jpgFF,_jpegFF,_pngFF]);
 docsDir.addEventListener(FileListEvent.SELECT_MULTIPLE, filesSelected);
} catch (error :Error) {
 trace(error.message);
}
function filesSelected(event :FileListEvent) : void {
  for ( var i :uint = 0; i < event.files.length; i ++) {
  trace(event.files[i].nativePath);
 }
}