匹配文件后缀名 MIME 类型。
1 import java.io.File; 2 3 import android.content.Context; 4 import android.content.Intent; 5 import android.net.Uri; 6 7 public class OpenFileUtil { 8 9 public static final String[][] MIME_MapTable = { 10 // {后缀名，MIME类型} 11 { ".3gp", "video/3gpp" }, 12 { ".apk", "application/vnd.android.package-archive" }, 13 { ".asf", "video/x-ms-asf" }, 14 { ".avi", "video/x-msvideo" }, 15 { ".bin", "application/octet-stream" }, 16 { ".bmp", "image/bmp" }, 17 { ".c", "text/plain" }, 18 { ".class", "application/octet-stream" }, 19 { ".conf", "text/plain" }, 20 { ".cpp", "text/plain" }, 21 { ".doc", "application/msword" }, 22 { ".docx", 23 "application/vnd.openxmlformats-officedocument.wordprocessingml.document" }, 24 { ".xls", "application/vnd.ms-excel" }, 25 { ".xlsx", 26 "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" }, 27 { ".exe", "application/octet-stream" }, 28 { ".gif", "image/gif" }, 29 { ".gtar", "application/x-gtar" }, 30 { ".gz", "application/x-gzip" }, 31 { ".h", "text/plain" }, 32 { ".htm", "text/html" }, 33 { ".html", "text/html" }, 34 { ".jar", "application/java-archive" }, 35 { ".java", "text/plain" }, 36 { ".jpeg", "image/jpeg" }, 37 { ".jpg", "image/jpeg" }, 38 { ".js", "application/x-javascript" }, 39 { ".log", "text/plain" }, 40 { ".m3u", "audio/x-mpegurl" }, 41 { ".m4a", "audio/mp4a-latm" }, 42 { ".m4b", "audio/mp4a-latm" }, 43 { ".m4p", "audio/mp4a-latm" }, 44 { ".m4u", "video/vnd.mpegurl" }, 45 { ".m4v", "video/x-m4v" }, 46 { ".mov", "video/quicktime" }, 47 { ".mp2", "audio/x-mpeg" }, 48 { ".mp3", "audio/x-mpeg" }, 49 { ".mp4", "video/mp4" }, 50 { ".mpc", "application/vnd.mpohun.certificate" }, 51 { ".mpe", "video/mpeg" }, 52 { ".mpeg", "video/mpeg" }, 53 { ".mpg", "video/mpeg" }, 54 { ".mpg4", "video/mp4" }, 55 { ".mpga", "audio/mpeg" }, 56 { ".msg", "application/vnd.ms-outlook" }, 57 { ".ogg", "audio/ogg" }, 58 { ".pdf", "application/pdf" }, 59 { ".png", "image/png" }, 60 { ".pps", "application/vnd.ms-powerpoint" }, 61 { ".ppt", "application/vnd.ms-powerpoint" }, 62 { ".pptx", 63 "application/vnd.openxmlformats-officedocument.presentationml.presentation" }, 64 { ".prop", "text/plain" }, { ".rc", "text/plain" }, 65 { ".rmvb", "audio/x-pn-realaudio" }, { ".rtf", "application/rtf" }, 66 { ".sh", "text/plain" }, { ".tar", "application/x-tar" }, 67 { ".tgz", "application/x-compressed" }, { ".txt", "text/plain" }, 68 { ".wav", "audio/x-wav" }, { ".wma", "audio/x-ms-wma" }, 69 { ".wmv", "audio/x-ms-wmv" }, 70 { ".wps", "application/vnd.ms-works" }, { ".xml", "text/plain" }, 71 { ".z", "application/x-compress" }, 72 { ".zip", "application/x-zip-compressed" }, { "", "*/*" } }; 73 74 /** 75 * 打开文件 76 * 77 * @param file 78 */ 79 public static void openFile(File file, Context context) { 80 81 Intent intent = new Intent(); 82 intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 83 // 设置 intent 的 Action 属性 84 intent.setAction(Intent.ACTION_VIEW); 85 // 获取文件 file 的 MIME 类型 86 String type = getMIMEType(file); 87 // 设置 intent 的 data 和 Type 属性。 88 intent.setDataAndType(/* uri */Uri.fromFile(file), type); 89 // 跳转 90 context.startActivity(intent); 91 92 } 93 94 /** 95 * @param file 96 * @return 获得文件后缀名 97 */ 98 private static String getMIMEType(File file) { 99 String type = "*/*"; 100 String fName = file.getName(); 101 // 获取后缀名前的分隔符"."在fName中的位置。 102 int dotIndex = fName.lastIndexOf("."); 103 if (dotIndex < 0) { 104 return type; 105 } 106 /* 获取文件的后缀名 */ 107 String end = fName.substring(dotIndex, fName.length()).toLowerCase(); 108 if (end == "") 109 return type; 110 // 在 MIME 和文件类型的匹配表中找到对应的 MIME 类型。 111 for (int i = 0; i < MIME_MapTable.length; i++) { // MIME_MapTable??在这里你一定有疑问，这个MIME_MapTable是什么？ 112 if (end.equals(MIME_MapTable[i][0])) 113 type = MIME_MapTable[i][1]; 114 } 115 return type; 116 } 117 118 }