問題：

在做文本文件讀取時，從assert文件中獲取文件

getResources().getAssets().openFd("test.txt").getFileDescriptor()

會報錯，提示File not Found ,because the file compressed,查找了很多資料，android打包成apk時，在assert文件中，除了音視頻文件不壓縮外，像txt之類的會進行壓縮成zip包，以節約空間，所以getFileDescriptor()時獲取不到，

通用都是獲取文件流，但在做大文件讀取時，最新技術推薦使用java nio中內存映射技術MappedByteBuffer

public void openbook(FileDescriptor fileD) throws IOException {

//book_file = new File(strFilePath);

FileInputStream in=new FileInputStream(fileD);

long lLen = in.available();

m_mbBufLen = (int) lLen;

m_mbBuf =in.getChannel().map(

FileChannel.MapMode.READ_ONLY, 0, lLen);

}

問題參考：

When developing an Android app, any data file, image or XML file (that is, any Resource or Asset) you use is bundled into your application package (APK) for distribution. The Android Asset Packaging Tool, oraapt, is responsible for creating this bundle, which you can think of as a ZIP file with a particular layout that the Android OS can understand. When your application is installed, whether in development mode or by an end user, this APK file is simply dropped into a special location on the device’s (or emulator’s) filesystem.

As part of preparing your APK,aaptselectively compresses various assets to save space on the device. The wayaaptdetermines which assets need compression is by their file extension. The following code, taken fromPackage.cppin theaaptsource code, sheds some light on which types of files are not compressed by default:

/* 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"

};

解決方案：

配置build.xml時配置不壓縮txt文件

D:\android-eclipse\sdk\tools\ant

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}">

總結

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