應用中如何調用系統所裝的軟件打開一個文件，這是我們經常碰到的問題

/** * 打開文件 * @param file */ private void openFile(File file){ Intent intent = new Intent(); intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); //設置intent的Action屬性 intent.setAction(Intent.ACTION_VIEW); //獲取文件file的MIME類型 String type = getMIMEType(file); //設置intent的data和Type屬性。 intent.setDataAndType(/*uri*/Uri.fromFile(file), type); //跳轉 startActivity(intent); } /** * 根據文件后綴名獲得對應的MIME類型。 * @param file */ private String getMIMEType(File file) { String type="*/*"; String fName = file.getName(); //獲取后綴名前的分隔符"."在fName中的位置。 int dotIndex = fName.lastIndexOf("."); if(dotIndex < 0){ return type; } /* 獲取文件的后綴名 */ String end=fName.substring(dotIndex,fName.length()).toLowerCase(); if(end=="")return type; //在MIME和文件類型的匹配表中找到對應的MIME類型。 for(int i=0;i<MIME_MapTable.length;i++){ //MIME_MapTable??在這里你一定有疑問，這個MIME_MapTable是什么？ if(end.equals(MIME_MapTable[i][0])) type = MIME_MapTable[i][1]; } return type; } MIME_MapTable是所有文件的后綴名所對應的MIME類型的一個String數組：

private final String[][] MIME_MapTable={ //{后綴名， MIME類型} {".3gp", "video/3gpp"}, {".apk", "application/vnd.android.package-archive"}, {".asf", "video/x-ms-asf"}, {".avi", "video/x-msvideo"}, {".bin", "application/octet-stream"}, {".bmp", "image/bmp"}, {".c", "text/plain"}, {".class", "application/octet-stream"}, {".conf", "text/plain"}, {".cpp", "text/plain"}, {".doc", "application/msword"}, {".docx", "application/vnd.openxmlformats-officedocument.wordprocessingml.document"}, {".xls", "application/vnd.ms-excel"}, {".xlsx", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"}, {".exe", "application/octet-stream"}, {".gif", "image/gif"}, {".gtar", "application/x-gtar"}, {".gz", "application/x-gzip"}, {".h", "text/plain"}, {".htm", "text/html"}, {".html", "text/html"}, {".jar", "application/java-archive"}, {".java", "text/plain"}, {".jpeg", "image/jpeg"}, {".jpg", "image/jpeg"}, {".js", "application/x-javascript"}, {".log", "text/plain"}, {".m3u", "audio/x-mpegurl"}, {".m4a", "audio/mp4a-latm"}, {".m4b", "audio/mp4a-latm"}, {".m4p", "audio/mp4a-latm"}, {".m4u", "video/vnd.mpegurl"}, {".m4v", "video/x-m4v"}, {".mov", "video/quicktime"}, {".mp2", "audio/x-mpeg"}, {".mp3", "audio/x-mpeg"}, {".mp4", "video/mp4"}, {".mpc", "application/vnd.mpohun.certificate"}, {".mpe", "video/mpeg"}, {".mpeg", "video/mpeg"}, {".mpg", "video/mpeg"}, {".mpg4", "video/mp4"}, {".mpga", "audio/mpeg"}, {".msg", "application/vnd.ms-outlook"}, {".ogg", "audio/ogg"}, {".pdf", "application/pdf"}, {".png", "image/png"}, {".pps", "application/vnd.ms-powerpoint"}, {".ppt", "application/vnd.ms-powerpoint"}, {".pptx", "application/vnd.openxmlformats-officedocument.presentationml.presentation"}, {".prop", "text/plain"}, {".rc", "text/plain"}, {".rmvb", "audio/x-pn-realaudio"}, {".rtf", "application/rtf"}, {".sh", "text/plain"}, {".tar", "application/x-tar"}, {".tgz", "application/x-compressed"}, {".txt", "text/plain"}, {".wav", "audio/x-wav"}, {".wma", "audio/x-ms-wma"}, {".wmv", "audio/x-ms-wmv"}, {".wps", "application/vnd.ms-works"}, {".xml", "text/plain"}, {".z", "application/x-compress"}, {".zip", "application/x-zip-compressed"}, {"", "*/*"} }; 調用系統的程序安裝器來安裝apk：

/*** 安裝apk* @param context Context* @param file File*/public static void installApk(Context context, File file) {// 調用系統打開apk文件.Intent intent = new Intent(Intent.ACTION_VIEW);intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);intent.setDataAndType(Uri.fromFile(file), MimeTypeMap.getSingleton().getMimeTypeFromExtension(MimeTypeMap.getFileExtensionFromUrl(file.getPath())));//根據擴展名獲得Mime類型context.startActivity(intent);} Intent intent = new Intent();intent.setAction(Intent.ACTION_VIEW);<pre name="code" class="java"> intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive"); startActivity(intent);

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