安卓 Xamarin : Open file from Storage (with path)

Question

我的应用程序将不同类型的文件从我的服务器加载到设备存储。

对于我要打开的所有文件，我有文件在存储中的路径。

对于 .pdf-Files 我正在使用 WebView 打开 .pdf-给定路径的文件(例如)因此我分开了路径

var fileType = path.Split('.').Last().ToLower();

如果文件类型是 pdf，我会打开 WebView。

对于 .docx、.xlsx 等文件，我希望我的应用询问我，我想使用什么程序打开文件。

我不想打开文件浏览器(例如通过Intent.CreateChooser，如果你想从图库中选择一张图片)

我只知道存储中的一个文件的路径，我想直接打开这个文件。

我认为 Android Xamarin 会有一个简单的解决方案。但是，我还没有发现任何工作。

编辑:简短明了:

我有路径storage/emulated/0/MyApp/myFile.docx，我需要一个采用该路径的方法，检测是否有可以打开的应用程序此文件，如果有，请我选择一个应用程序来打开该文件。

Answer 1

1) 使用ActionView打开文件:

  private void openFile(File file)
    { 
        Intent intent = new Intent();
        intent.AddFlags(ActivityFlags.NewTask);
        intent.SetAction(Intent.ActionView);
        string type = getMIMEType(file);
        intent.SetDataAndType(Uri.FromFile(file), type);
        StartActivity(intent);
    }

2)通过文件扩展名获取MIME类型:

private string getMIMEType(File file)
{
    string type = "*/*";
    string fName = file.Name; 
    int dotIndex = fName.LastIndexOf(".");
    if (dotIndex < 0)
    {
        return type;
    }
    // get the file extension
    string end = fName.Substring(dotIndex, fName.Length).ToLower();
    if (end == "") return type;
    //from MIME_MapTable to get the respond type  
    for (int i = 0; i < MIME_MapTable.Length; i++)
    {
        if (end.Equals(MIME_MapTable[i,0]))
            type = MIME_MapTable[i,1];
    }
    return type;
}

3) 这是 MIME_MapTable 数组:

   public string[,] MIME_MapTable = new string[,] {

            {".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"},
            {".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"},
            {".prop",    "text/plain"},
            {".rar",    "application/x-rar-compressed"},
            {".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/xml"},  
            {".xml",    "text/plain"},
            {".z",        "application/x-compress"},
            {".zip",    "application/zip"},
            {"",        "*/*"}

    };

注意事项:

如果你想让你的应用程序在 >7.0 上运行，你需要使用 FileProvider .