小米开源文件管理器MiCodeFileExplorer-源码研究(6)-媒体文件MediaFile和文件类型MimeUtils

接着之前的第4篇，本篇的2个类，仍然是工具类。
MediaFile，媒体文件，定义了一大堆的常量，真正的有用的方法就几个。
isAudioFileType、isVideoFileType之类的。

MimeUtils，文件类型工具类，定义了一大堆的
add("application/zip", "zip");
某种扩展格式，对应的mime类型。

通过阅读代码观察到的2点现象，我有2点猜测：
现象
1.注释是英文的，很溜的那种~
2.好多方法没有被本项目使用。
Ctrl+Shift+G可以查看一个想用被调用的地方。

猜测
1.部分代码，是从小米其它项目或者Android相关或者Java项目，copy过来的。
2.项目是经过裁剪的，毕竟这个开源项目是“社区开源版”-“The MiCode Open Source Community”。

2个类的源代码，看起来很多，我们只要理解是因为有很多文件类型，导致的就可以了~
没有必要死记,今后如果有需要，先Copy再改造~

package net.micode.fileexplorer.util;import android.mtp.MtpConstants;import java.util.HashMap;public class MediaFile {// Audio file typespublic static final int FILE_TYPE_MP3 = 1;public static final int FILE_TYPE_M4A = 2;public static final int FILE_TYPE_WAV = 3;public static final int FILE_TYPE_AMR = 4;public static final int FILE_TYPE_AWB = 5;public static final int FILE_TYPE_WMA = 6;public static final int FILE_TYPE_OGG = 7;public static final int FILE_TYPE_AAC = 8;public static final int FILE_TYPE_MKA = 9;public static final int FILE_TYPE_FLAC = 10;private static final int FIRST_AUDIO_FILE_TYPE = FILE_TYPE_MP3;private static final int LAST_AUDIO_FILE_TYPE = FILE_TYPE_FLAC;// MIDI file typespublic static final int FILE_TYPE_MID = 11;public static final int FILE_TYPE_SMF = 12;public static final int FILE_TYPE_IMY = 13;private static final int FIRST_MIDI_FILE_TYPE = FILE_TYPE_MID;private static final int LAST_MIDI_FILE_TYPE = FILE_TYPE_IMY;// Video file typespublic static final int FILE_TYPE_MP4 = 21;public static final int FILE_TYPE_M4V = 22;public static final int FILE_TYPE_3GPP = 23;public static final int FILE_TYPE_3GPP2 = 24;public static final int FILE_TYPE_WMV = 25;public static final int FILE_TYPE_ASF = 26;public static final int FILE_TYPE_MKV = 27;public static final int FILE_TYPE_MP2TS = 28;public static final int FILE_TYPE_AVI = 29;public static final int FILE_TYPE_WEBM = 30;private static final int FIRST_VIDEO_FILE_TYPE = FILE_TYPE_MP4;private static final int LAST_VIDEO_FILE_TYPE = FILE_TYPE_WEBM;// Image file typespublic static final int FILE_TYPE_JPEG = 31;public static final int FILE_TYPE_GIF = 32;public static final int FILE_TYPE_PNG = 33;public static final int FILE_TYPE_BMP = 34;public static final int FILE_TYPE_WBMP = 35;public static final int FILE_TYPE_WEBP = 36;private static final int FIRST_IMAGE_FILE_TYPE = FILE_TYPE_JPEG;private static final int LAST_IMAGE_FILE_TYPE = FILE_TYPE_WEBP;public static class MediaFileType {public final int fileType;public final String mimeType;MediaFileType(int fileType, String mimeType) {this.fileType = fileType;this.mimeType = mimeType;}}private static HashMap<String, MediaFileType> sFileTypeMap = new HashMap<String, MediaFileType>();private static HashMap<String, Integer> sMimeTypeMap = new HashMap<String, Integer>();static void addFileType(String extension, int fileType, String mimeType) {sFileTypeMap.put(extension, new MediaFileType(fileType, mimeType));sMimeTypeMap.put(mimeType, Integer.valueOf(fileType));}static void addFileType(String extension, int fileType, String mimeType, int mtpFormatCode) {addFileType(extension, fileType, mimeType);}static {addFileType("MP3", FILE_TYPE_MP3, "audio/mpeg", MtpConstants.FORMAT_MP3);addFileType("M4A", FILE_TYPE_M4A, "audio/mp4", MtpConstants.FORMAT_MPEG);addFileType("WAV", FILE_TYPE_WAV, "audio/x-wav", MtpConstants.FORMAT_WAV);addFileType("AMR", FILE_TYPE_AMR, "audio/amr");addFileType("AWB", FILE_TYPE_AWB, "audio/amr-wb");addFileType("OGG", FILE_TYPE_OGG, "application/ogg", MtpConstants.FORMAT_OGG);addFileType("OGA", FILE_TYPE_OGG, "application/ogg", MtpConstants.FORMAT_OGG);addFileType("AAC", FILE_TYPE_AAC, "audio/aac", MtpConstants.FORMAT_AAC);addFileType("AAC", FILE_TYPE_AAC, "audio/aac-adts", MtpConstants.FORMAT_AAC);addFileType("MKA", FILE_TYPE_MKA, "audio/x-matroska");addFileType("MPEG", FILE_TYPE_MP4, "video/mpeg", MtpConstants.FORMAT_MPEG);addFileType("MPG", FILE_TYPE_MP4, "video/mpeg", MtpConstants.FORMAT_MPEG);addFileType("MP4", FILE_TYPE_MP4, "video/mp4", MtpConstants.FORMAT_MPEG);addFileType("M4V", FILE_TYPE_M4V, "video/mp4", MtpConstants.FORMAT_MPEG);addFileType("3GP", FILE_TYPE_3GPP, "video/3gpp", MtpConstants.FORMAT_3GP_CONTAINER);addFileType("3GPP", FILE_TYPE_3GPP, "video/3gpp", MtpConstants.FORMAT_3GP_CONTAINER);addFileType("3G2", FILE_TYPE_3GPP2, "video/3gpp2", MtpConstants.FORMAT_3GP_CONTAINER);addFileType("3GPP2", FILE_TYPE_3GPP2, "video/3gpp2", MtpConstants.FORMAT_3GP_CONTAINER);addFileType("MKV", FILE_TYPE_MKV, "video/x-matroska");addFileType("WEBM", FILE_TYPE_WEBM, "video/webm");addFileType("TS", FILE_TYPE_MP2TS, "video/mp2ts");addFileType("AVI", FILE_TYPE_AVI, "video/avi");addFileType("JPG", FILE_TYPE_JPEG, "image/jpeg", MtpConstants.FORMAT_EXIF_JPEG);addFileType("JPEG", FILE_TYPE_JPEG, "image/jpeg", MtpConstants.FORMAT_EXIF_JPEG);addFileType("GIF", FILE_TYPE_GIF, "image/gif", MtpConstants.FORMAT_GIF);addFileType("PNG", FILE_TYPE_PNG, "image/png", MtpConstants.FORMAT_PNG);addFileType("BMP", FILE_TYPE_BMP, "image/x-ms-bmp", MtpConstants.FORMAT_BMP);addFileType("WBMP", FILE_TYPE_WBMP, "image/vnd.wap.wbmp");addFileType("WEBP", FILE_TYPE_WEBP, "image/webp");}public static boolean isAudioFileType(int fileType) {return ((fileType >= FIRST_AUDIO_FILE_TYPE && fileType <= LAST_AUDIO_FILE_TYPE) || (fileType >= FIRST_MIDI_FILE_TYPE && fileType <= LAST_MIDI_FILE_TYPE));}public static boolean isVideoFileType(int fileType) {return (fileType >= FIRST_VIDEO_FILE_TYPE && fileType <= LAST_VIDEO_FILE_TYPE);}public static boolean isImageFileType(int fileType) {return (fileType >= FIRST_IMAGE_FILE_TYPE && fileType <= LAST_IMAGE_FILE_TYPE);}public static MediaFileType getFileType(String path) {int lastDot = path.lastIndexOf(".");if (lastDot < 0)return null;return sFileTypeMap.get(path.substring(lastDot + 1).toUpperCase());}
}

package net.micode.fileexplorer.util;import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;/*** Utilities for dealing with MIME types.* Used to implement java.net.URLConnection and android.webkit.MimeTypeMap.*/
public final class MimeUtils {private static final Map<String, String> mimeTypeToExtensionMap = new HashMap<String, String>();private static final Map<String, String> extensionToMimeTypeMap = new HashMap<String, String>();static {// The following table is based on /etc/mime.types data minus// chemical/* MIME types and MIME types that don't map to any// file extensions. We also exclude top-level domain names to// deal with cases like://// mail.google.com/a/google.com//// and "active" MIME types (due to potential security issues).add("application/andrew-inset", "ez");add("application/dsptype", "tsp");add("application/futuresplash", "spl");add("application/hta", "hta");add("application/mac-binhex40", "hqx");add("application/mac-compactpro", "cpt");add("application/mathematica", "nb");add("application/msaccess", "mdb");add("application/oda", "oda");add("application/ogg", "ogg");add("application/pdf", "pdf");add("application/pgp-keys", "key");add("application/pgp-signature", "pgp");add("application/pics-rules", "prf");add("application/rar", "rar");add("application/rdf+xml", "rdf");add("application/rss+xml", "rss");add("application/zip", "zip");add("application/vnd.android.package-archive", "apk");add("application/vnd.cinderella", "cdy");add("application/vnd.ms-pki.stl", "stl");add("application/vnd.oasis.opendocument.database", "odb");add("application/vnd.oasis.opendocument.formula", "odf");add("application/vnd.oasis.opendocument.graphics", "odg");add("application/vnd.oasis.opendocument.graphics-template", "otg");add("application/vnd.oasis.opendocument.image", "odi");add("application/vnd.oasis.opendocument.spreadsheet", "ods");add("application/vnd.oasis.opendocument.spreadsheet-template", "ots");add("application/vnd.oasis.opendocument.text", "odt");add("application/vnd.oasis.opendocument.text-master", "odm");add("application/vnd.oasis.opendocument.text-template", "ott");add("application/vnd.oasis.opendocument.text-web", "oth");add("application/vnd.google-earth.kml+xml", "kml");add("application/vnd.google-earth.kmz", "kmz");add("application/msword", "doc");add("application/msword", "dot");add("application/vnd.openxmlformats-officedocument.wordprocessingml.document", "docx");add("application/vnd.openxmlformats-officedocument.wordprocessingml.template", "dotx");add("application/vnd.ms-excel", "xls");add("application/vnd.ms-excel", "xlt");add("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "xlsx");add("application/vnd.openxmlformats-officedocument.spreadsheetml.template", "xltx");add("application/vnd.ms-powerpoint", "ppt");add("application/vnd.ms-powerpoint", "pot");add("application/vnd.ms-powerpoint", "pps");add("application/vnd.openxmlformats-officedocument.presentationml.presentation", "pptx");add("application/vnd.openxmlformats-officedocument.presentationml.template", "potx");add("application/vnd.openxmlformats-officedocument.presentationml.slideshow", "ppsx");add("application/vnd.rim.cod", "cod");add("application/vnd.smaf", "mmf");add("application/vnd.stardivision.calc", "sdc");add("application/vnd.stardivision.draw", "sda");add("application/vnd.stardivision.impress", "sdd");add("application/vnd.stardivision.impress", "sdp");add("application/vnd.stardivision.math", "smf");add("application/vnd.stardivision.writer", "sdw");add("application/vnd.stardivision.writer", "vor");add("application/vnd.stardivision.writer-global", "sgl");add("application/vnd.sun.xml.calc", "sxc");add("application/vnd.sun.xml.calc.template", "stc");add("application/vnd.sun.xml.draw", "sxd");add("application/vnd.sun.xml.draw.template", "std");add("application/vnd.sun.xml.impress", "sxi");add("application/vnd.sun.xml.impress.template", "sti");add("application/vnd.sun.xml.math", "sxm");add("application/vnd.sun.xml.writer", "sxw");add("application/vnd.sun.xml.writer.global", "sxg");add("application/vnd.sun.xml.writer.template", "stw");add("application/vnd.visio", "vsd");add("application/x-abiword", "abw");add("application/x-apple-diskimage", "dmg");add("application/x-bcpio", "bcpio");add("application/x-bittorrent", "torrent");add("application/x-cdf", "cdf");add("application/x-cdlink", "vcd");add("application/x-chess-pgn", "pgn");add("application/x-cpio", "cpio");add("application/x-debian-package", "deb");add("application/x-debian-package", "udeb");add("application/x-director", "dcr");add("application/x-director", "dir");add("application/x-director", "dxr");add("application/x-dms", "dms");add("application/x-doom", "wad");add("application/x-dvi", "dvi");add("application/x-flac", "flac");add("application/x-font", "pfa");add("application/x-font", "pfb");add("application/x-font", "gsf");add("application/x-font", "pcf");add("application/x-font", "pcf.Z");add("application/x-freemind", "mm");add("application/x-futuresplash", "spl");add("application/x-gnumeric", "gnumeric");add("application/x-go-sgf", "sgf");add("application/x-graphing-calculator", "gcf");add("application/x-gtar", "gtar");add("application/x-gtar", "tgz");add("application/x-gtar", "taz");add("application/x-hdf", "hdf");add("application/x-ica", "ica");add("application/x-internet-signup", "ins");add("application/x-internet-signup", "isp");add("application/x-iphone", "iii");add("application/x-iso9660-image", "iso");add("application/x-jmol", "jmz");add("application/x-kchart", "chrt");add("application/x-killustrator", "kil");add("application/x-koan", "skp");add("application/x-koan", "skd");add("application/x-koan", "skt");add("application/x-koan", "skm");add("application/x-kpresenter", "kpr");add("application/x-kpresenter", "kpt");add("application/x-kspread", "ksp");add("application/x-kword", "kwd");add("application/x-kword", "kwt");add("application/x-latex", "latex");add("application/x-lha", "lha");add("application/x-lzh", "lzh");add("application/x-lzx", "lzx");add("application/x-maker", "frm");add("application/x-maker", "maker");add("application/x-maker", "frame");add("application/x-maker", "fb");add("application/x-maker", "book");add("application/x-maker", "fbdoc");add("application/x-mif", "mif");add("application/x-ms-wmd", "wmd");add("application/x-ms-wmz", "wmz");add("application/x-msi", "msi");add("application/x-ns-proxy-autoconfig", "pac");add("application/x-nwc", "nwc");add("application/x-object", "o");add("application/x-oz-application", "oza");add("application/x-pkcs12", "p12");add("application/x-pkcs7-certreqresp", "p7r");add("application/x-pkcs7-crl", "crl");add("application/x-quicktimeplayer", "qtl");add("application/x-shar", "shar");add("application/x-shockwave-flash", "swf");add("application/x-stuffit", "sit");add("application/x-sv4cpio", "sv4cpio");add("application/x-sv4crc", "sv4crc");add("application/x-tar", "tar");add("application/x-texinfo", "texinfo");add("application/x-texinfo", "texi");add("application/x-troff", "t");add("application/x-troff", "roff");add("application/x-troff-man", "man");add("application/x-ustar", "ustar");add("application/x-wais-source", "src");add("application/x-wingz", "wz");add("application/x-webarchive", "webarchive");add("application/x-webarchive-xml", "webarchivexml");add("application/x-x509-ca-cert", "crt");add("application/x-x509-user-cert", "crt");add("application/x-xcf", "xcf");add("application/x-xfig", "fig");add("application/xhtml+xml", "xhtml");add("audio/3gpp", "3gpp");add("audio/amr", "amr");add("audio/basic", "snd");add("audio/midi", "mid");add("audio/midi", "midi");add("audio/midi", "kar");add("audio/midi", "xmf");add("audio/mobile-xmf", "mxmf");add("audio/mpeg", "mpga");add("audio/mpeg", "mpega");add("audio/mpeg", "mp2");add("audio/mpeg", "mp3");add("audio/mpeg", "m4a");add("audio/mpegurl", "m3u");add("audio/prs.sid", "sid");add("audio/x-aiff", "aif");add("audio/x-aiff", "aiff");add("audio/x-aiff", "aifc");add("audio/x-gsm", "gsm");add("audio/x-mpegurl", "m3u");add("audio/x-ms-wma", "wma");add("audio/x-ms-wax", "wax");add("audio/x-pn-realaudio", "ra");add("audio/x-pn-realaudio", "rm");add("audio/x-pn-realaudio", "ram");add("audio/x-realaudio", "ra");add("audio/x-scpls", "pls");add("audio/x-sd2", "sd2");add("audio/x-wav", "wav");add("image/bmp", "bmp");add("audio/x-qcp", "qcp");add("image/gif", "gif");add("image/ico", "cur");add("image/ico", "ico");add("image/ief", "ief");add("image/jpeg", "jpeg");add("image/jpeg", "jpg");add("image/jpeg", "jpe");add("image/pcx", "pcx");add("image/png", "png");add("image/svg+xml", "svg");add("image/svg+xml", "svgz");add("image/tiff", "tiff");add("image/tiff", "tif");add("image/vnd.djvu", "djvu");add("image/vnd.djvu", "djv");add("image/vnd.wap.wbmp", "wbmp");add("image/x-cmu-raster", "ras");add("image/x-coreldraw", "cdr");add("image/x-coreldrawpattern", "pat");add("image/x-coreldrawtemplate", "cdt");add("image/x-corelphotopaint", "cpt");add("image/x-icon", "ico");add("image/x-jg", "art");add("image/x-jng", "jng");add("image/x-ms-bmp", "bmp");add("image/x-photoshop", "psd");add("image/x-portable-anymap", "pnm");add("image/x-portable-bitmap", "pbm");add("image/x-portable-graymap", "pgm");add("image/x-portable-pixmap", "ppm");add("image/x-rgb", "rgb");add("image/x-xbitmap", "xbm");add("image/x-xpixmap", "xpm");add("image/x-xwindowdump", "xwd");add("model/iges", "igs");add("model/iges", "iges");add("model/mesh", "msh");add("model/mesh", "mesh");add("model/mesh", "silo");add("text/calendar", "ics");add("text/calendar", "icz");add("text/comma-separated-values", "csv");add("text/css", "css");add("text/html", "htm");add("text/html", "html");add("text/h323", "323");add("text/iuls", "uls");add("text/mathml", "mml");// add ".txt" first so it will be the default for ExtensionFromMimeTypeadd("text/plain", "txt");add("text/plain", "asc");add("text/plain", "text");add("text/plain", "diff");add("text/plain", "po");     // reserve "pot" for vnd.ms-powerpointadd("text/richtext", "rtx");add("text/rtf", "rtf");add("text/texmacs", "ts");add("text/text", "phps");add("text/tab-separated-values", "tsv");add("text/xml", "xml");add("text/x-bibtex", "bib");add("text/x-boo", "boo");add("text/x-c++hdr", "h++");add("text/x-c++hdr", "hpp");add("text/x-c++hdr", "hxx");add("text/x-c++hdr", "hh");add("text/x-c++src", "c++");add("text/x-c++src", "cpp");add("text/x-c++src", "cxx");add("text/x-chdr", "h");add("text/x-component", "htc");add("text/x-csh", "csh");add("text/x-csrc", "c");add("text/x-dsrc", "d");add("text/x-haskell", "hs");add("text/x-java", "java");add("text/x-literate-haskell", "lhs");add("text/x-moc", "moc");add("text/x-pascal", "p");add("text/x-pascal", "pas");add("text/x-pcs-gcd", "gcd");add("text/x-setext", "etx");add("text/x-tcl", "tcl");add("text/x-tex", "tex");add("text/x-tex", "ltx");add("text/x-tex", "sty");add("text/x-tex", "cls");add("text/x-vcalendar", "vcs");add("text/x-vcard", "vcf");add("video/3gpp", "3gpp");add("video/3gpp", "3gp");add("video/3gpp", "3g2");add("video/dl", "dl");add("video/dv", "dif");add("video/dv", "dv");add("video/fli", "fli");add("video/m4v", "m4v");add("video/mpeg", "mpeg");add("video/mpeg", "mpg");add("video/mpeg", "mpe");add("video/mp4", "mp4");add("video/mpeg", "VOB");add("video/quicktime", "qt");add("video/quicktime", "mov");add("video/vnd.mpegurl", "mxu");add("video/webm", "webm");add("video/x-la-asf", "lsf");add("video/x-la-asf", "lsx");add("video/x-mng", "mng");add("video/x-ms-asf", "asf");add("video/x-ms-asf", "asx");add("video/x-ms-wm", "wm");add("video/x-ms-wmv", "wmv");add("video/x-ms-wmx", "wmx");add("video/x-ms-wvx", "wvx");add("video/x-msvideo", "avi");add("video/x-sgi-movie", "movie");add("x-conference/x-cooltalk", "ice");add("x-epoc/x-sisx-app", "sisx");applyOverrides();}private static void add(String mimeType, String extension) {//// if we have an existing x --> y mapping, we do not want to// override it with another mapping x --> ?// this is mostly because of the way the mime-type map below// is constructed (if a mime type maps to several extensions// the first extension is considered the most popular and is// added first; we do not want to overwrite it later).//if (!mimeTypeToExtensionMap.containsKey(mimeType)) {mimeTypeToExtensionMap.put(mimeType, extension);}extensionToMimeTypeMap.put(extension, mimeType);}private static InputStream getContentTypesPropertiesStream() {// User override?String userTable = System.getProperty("content.types.user.table");if (userTable != null) {File f = new File(userTable);if (f.exists()) {try {return new FileInputStream(f);} catch (IOException ignored) {}}}// Standard location?File f = new File(System.getProperty("java.home"), "lib" + File.separator + "content-types.properties");if (f.exists()) {try {return new FileInputStream(f);} catch (IOException ignored) {}}return null;}/*** This isn't what the RI does. The RI doesn't have hard-coded defaults, so supplying your* own "content.types.user.table" means you don't get any of the built-ins, and the built-ins* come from "$JAVA_HOME/lib/content-types.properties".*/private static void applyOverrides() {// Get the appropriate InputStream to read overrides from, if any.InputStream stream = getContentTypesPropertiesStream();if (stream == null) {return;}try {try {// Read the properties file...Properties overrides = new Properties();overrides.load(stream);// And translate its mapping to ours...for (Map.Entry<Object, Object> entry : overrides.entrySet()) {String extension = (String) entry.getKey();String mimeType = (String) entry.getValue();add(mimeType, extension);}} finally {stream.close();}} catch (IOException ignored) {}}private MimeUtils() {}/*** Returns the MIME type for the given extension.* @param extension A file extension without the leading '.'* @return The MIME type for the given extension or null iff there is none.*/public static String guessMimeTypeFromExtension(String extension) {if (extension == null || extension.isEmpty()) {return null;}return extensionToMimeTypeMap.get(extension);}//下面3个方法根本没有被调用过，因此，我猜测这个类很可能是从其它项目copy过来的。//也有可能是因为本项目是经过裁剪的，毕竟是开源社区版/*** Returns true if the given extension has a registered MIME type.* @param extension A file extension without the leading '.'* @return True iff there is an extension entry in the map.*/public static boolean hasExtension(String extension) {if (extension == null || extension.isEmpty()) {return false;}return extensionToMimeTypeMap.containsKey(extension);}/*** Returns the registered extension for the given MIME type. Note that some* MIME types map to multiple extensions. This call will return the most* common extension for the given MIME type.* @param mimeType A MIME type (i.e. text/plain)* @return The extension for the given MIME type or null iff there is none.*/public static String guessExtensionFromMimeType(String mimeType) {if (mimeType == null || mimeType.isEmpty()) {return null;}return mimeTypeToExtensionMap.get(mimeType);}/*** Returns true if the given MIME type has an entry in the map.* @param mimeType A MIME type (i.e. text/plain)* @return True iff there is a mimeType entry in the map.*/public static boolean hasMimeType(String mimeType) {if (mimeType == null || mimeType.isEmpty()) {return false;}return mimeTypeToExtensionMap.containsKey(mimeType);}
}

代码比自己码的文字还多，感觉自己纯粹是在贴代码哦~
代码整体比较简单，确实没啥好解释的~

再说了，晚上相对要累一些，写点轻松的也好啊~
接下来，再介绍相对难一点的~

等把基础介绍完了，再回头看界面、Activity、事件，才会容易一些~

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2011年对着书本Android应用开发揭秘,写了2个月的HelloWorld. 现在想复习并深入,我没有耐心再去一点点地敲代码了. 4年前自己是个学生,实习,现在有工作,只能业余时间研究. 这一点是 ...
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Mark几款优秀的基于MPC开源播放器的源码供参考.
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