android打开、查看文件

简单处理原理：

public void openFile0(File file){    String fileName = file.getAbsolutePath();if(fileName.endsWith(".png")|| fileName.endsWith(".jpg")|| fileName.endsWith(".jpeg")|| fileName.endsWith(".gif")){Intent intent = new Intent();    intent.setAction(android.content.Intent.ACTION_VIEW);    intent.setDataAndType(Uri.fromFile(file), "image/*");    startActivity(intent);}else if(fileName.endsWith(".mp4")|| fileName.endsWith(".3gp")|| fileName.endsWith(".avi")|| fileName.endsWith(".flv")|| fileName.endsWith(".wmv")|| fileName.endsWith(".rmvb")|| fileName.endsWith(".asf")|| fileName.endsWith(".mkv")|| fileName.endsWith(".mpg")){Intent intent = new Intent();    intent.setAction(android.content.Intent.ACTION_VIEW);    intent.setDataAndType(Uri.fromFile(file), "video/*");    startActivity(intent);}else if(fileName.endsWith(".mp3")|| fileName.endsWith(".ogg")|| fileName.endsWith(".ape")){Intent intent = new Intent();    intent.setAction(android.content.Intent.ACTION_VIEW);    intent.setDataAndType(Uri.fromFile(file), "audio/*");    startActivity(intent);}else if(fileName.endsWith(".apk")){Intent intent = new Intent();intent.setAction("android.intent.action.VIEW");intent.addCategory("android.intent.category.DEFAULT");intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");startActivity(intent);}}

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通用性处理关键代码:

/** * 调用可能打开文件的软件打开文件 * @param file */ public void openFile(File file){    Intent intent = new Intent();     intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);     //设置intent的Action属性     intent.setAction(Intent.ACTION_VIEW);     //获取文件file的MIME类型     String type = getMIMEType(file);     //设置intent的data和Type属性。     intent.setDataAndType(/*uri*/Uri.fromFile(file), type);     //跳转     try {startActivity(intent);   // 可能无应用可打开, 避免程序崩溃    } catch (Exception e) {         Toast.makeText(MainActivity.this, "无应用可打开此文件", Toast.LENGTH_SHORT).show();return;    }}

/** * 根据文件后缀名获得对应的MIME类型。 * @param file */ private String getMIMEType(File file) {          String type="*/*";     String fName = file.getName();     //获取后缀名前的分隔符"."在fName中的位置。     int dotIndex = fName.lastIndexOf(".");     if(dotIndex < 0){ return type;     }     /* 获取文件的后缀名*/     String end=fName.substring(dotIndex,fName.length()).toLowerCase(Locale.CHINA);     if(end=="")return type;    //在MIME和文件类型的匹配表中找到对应的MIME类型。     for(int i=0;i<FileFormatParams.MIME_MapTable.length;i++){ if(end.equals(FileFormatParams.MIME_MapTable[i][0]))     type = FileFormatParams.MIME_MapTable[i][1];     }            return type; } 

/** * 文件后缀对应文件类型。 * */ public class FileFormatParams {public static final String MIME_MapTable[][]={             //{后缀名，MIME类型}             {".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"},             {"",        "*/*"}           }; }