我在文件 RES /生，我想开这样的：

I have files in res/raw that I would like to open like this:

AssetFileDescriptor afd = getResources().openRawResourcesFd();

这允许，例如，通过 afd.getLength得到明确的文件大小（），其中 InputStream.available（）不答应，即使它的似乎的普遍工作。

This allows for, e.g., getting the definitive file size via afd.getLength(), which InputStream.available() does not promise, even if it seems to generally work.

然而，当我尝试这一点，将失败：

However, when I try this it fails:

java.io.FileNotFoundException：此文件无法打开的文件   描述;它可能是COM pressed

java.io.FileNotFoundException: This file can not be opened as a file descriptor; it is probably compressed

这些只是很小的文本文件。这是什么问题？

These are just small text files. What's the problem?

推荐答案

AAPT COM preSS最多的资源作为构建过程的一部分。据这篇文章它引用的是AAPT来源，例外情况是：

aapt compress most resources as part of the build process. According to this article which quotes the aapt source, the exceptions are:

/* these formats are already compressed, or don't compress well */
static const char* kNoCompressExt[] = {
    ".jpg", ".jpeg", ".png", ".gif",
    ".wav", ".mp2", ".mp3", ".ogg", ".aac",
    ".mpg", ".mpeg", ".mid", ".midi", ".smf", ".jet",
    ".rtttl", ".imy", ".xmf", ".mp4", ".m4a",
    ".m4v", ".3gp", ".3gpp", ".3g2", ".3gpp2",
    ".amr", ".awb", ".wma", ".wmv"
};

因此​​，要解决这个问题的一种方法是通过欺骗重命名文件与扩展名的AAPT。

So one way to get around this problem is to spoof aapt by renaming your files with one of those extensions.

这似乎不是很理想。相反，如果你想添加扩展到例外列表中，您可以编辑 [SDK] /tool​​s/ant/build.xml 。搜索文件 nocom preSS ：

That may not seem very satisfactory. If instead you want to add an extension to the list of exceptions, you can edit [sdk]/tools/ant/build.xml. Search the file for nocompress:

        <aapt executable="${aapt}"
                command="package"
                versioncode="${version.code}"
                versionname="${version.name}"
                debug="${build.is.packaging.debug}"
                manifest="${out.manifest.abs.file}"
                assets="${asset.absolute.dir}"
                androidjar="${project.target.android.jar}"
                apkfolder="${out.absolute.dir}"
                nocrunch="${build.packaging.nocrunch}"
                resourcefilename="${resource.package.file.name}"
                resourcefilter="${aapt.resource.filter}"
                libraryResFolderPathRefid="project.library.res.folder.path"
                libraryPackagesRefid="project.library.packages"
                libraryRFileRefid="project.library.bin.r.file.path"
                previousBuildType="${build.last.target}"
                buildType="${build.target}"
                ignoreAssets="${aapt.ignore.assets}">
            <res path="${out.res.absolute.dir}" />
            <res path="${resource.absolute.dir}" />
            <nocompress extension="txt"/>
            <!-- <nocompress /> forces no compression on any files in assets or res/raw -->
            <!-- <nocompress extension="xml" /> forces no compression on specific file extensions in assets and res/raw -->
        </aapt>   

在底部的评论是不言自明的。我插了例外 TXT 。请注意，你也可以关闭COM pression一起。

The comments at the bottom are self-explanatory. I inserted the exception for txt. Notice you can also turn off compression all together.

另外，创建一个特殊的扩展：

Alternately, create a special extension:

<nocompress extension="nocomp"> 

和重命名文件，例如， whatever.txt.nocomp 。这样你就可以留下的一切，除了特定的文件COM pression。

And rename your files, e.g., whatever.txt.nocomp. This way you can leave the compression on for everything except particular files.