5. 自定义文件类型 Custom your file type

如果默认的文件类型无法满足您的需求，您只需要简单三步即可实现您自己的文件类型，并进行检测和过滤操作。 If the default file types don't meet your needs, you can implement your own file types, detection and filtering in three simple steps.

1. 自定义文件类型(Customize your file type)

/**
    * 1. 自定义文件类型。通过路径或文件名来判断是否符合类型
    * 1. Customize the file type. Determine if it matches the type by path or filename.
    */
class CustomFileType(
    override val fileType: String = "",
    override val fileIconResId: Int = R.drawable.ic_unknown_file_picker
) : FileType {
    override fun verify(fileName: String): Boolean {
        return fileName.endsWith("123")
    }
}

2. 自定义文件检测器(Custom file detector)

/**
    * 2. 自定义文件检测器。
    * 检测是否符合您的类型，如果是，那么填充到[FileItemBeanImpl.fileType]中
    * 2. Custom file detector.
    * detects if it matches your type, and if so, then fill it into [FileItemBeanImpl.fileType]
    */
class CustomFileDetector : AbstractFileDetector() {
    private val customFileType by lazy { CustomFileType() }

    override fun fillFileType(itemBeanImpl: FileItemBeanImpl): FileItemBeanImpl {
        // detected file type by yourself and fill your type to [FileItemBeanImpl]
        if (customFileType.verify(itemBeanImpl.fileName)) {
            itemBeanImpl.fileType = customFileType
        }
        return itemBeanImpl
    }
}

3. 使用(Using them)

FilePickerManager
    .from(this@SampleActivity)
    // 1. 使用自定义文件检测器来检测类型，并赋值给  [FileItemBeanImpl.fileType] 属性
    // 1. Using detector detect file's type and fill it into [FileItemBeanImpl.fileType]
    .customDetector(CustomFileDetector())
    .filter(object : AbstractFileFilter() {
        override fun doFilter(listData: ArrayList<FileItemBeanImpl>): ArrayList<FileItemBeanImpl> {
            // 2. 接收结果列表，然后过滤出您想要的类型
            // 2. Receive result list and filter what you want
            listData.removeAll {
                (it.fileType !is CustomFileType) && !it.isDir
            }
            return listData
        }
    })
    .showHiddenFiles(true)
    .forResult(FilePickerManager.REQUEST_CODE)