学习Android之setDataAndType（利用第三方应用程序打开各种文件）

案例：

首先，我们先看看Android如何利用第三方应用程序打开PDF文件

      File tempFile = new File(path);        if (!tempFile.exists()) {            return;        }        try {     *//*       Intent intent = new Intent("android.intent.action.VIEW");            intent.addCategory("android.intent.category.DEFAULT");*//*            Intent intent = new Intent(Intent.ACTION_VIEW);            Uri data = Uri.fromFile(tempFile);            intent.setDataAndType(data, "application/pdf");            intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);            startActivity(intent);            finish();        } catch (ActivityNotFoundException ae) {            _projectUploadDetails_WebView.loadUrl("");            try {                _projectUploadDetails_WebView.removeView(docView);            } catch (Exception e) {            }            if (path.toLowerCase().endsWith(".pdf")) {                OpenPdf(path);            }        }

其中我们看到了intent

Intent设置setDataAndType，对跳转的传输的数据和类型进行设置。

其中我们还要分清uri url urn path的区别

URI，是uniform resource identifier，统一资源标识符，用来唯一的标识一个资源。

URL是uniform resource locator，统一资源定位器，它是一种具体的URI，即URL可以用来标识一个资源，而且还指明了如何locate这个资源。

URN，uniform resource name，统一资源命名，是通过名字来标识资源。

URI是以一种抽象的，高层次概念定义统一资源标识，而URL和URN则是具体的资源标识的方式。URL和URN都是一种URI。

总结：URL是一种具体的URI，它不仅唯一标识资源，而且还提供了定位该资源的信息。URI是一种语义上的抽象概念，可以是绝对的，也可以是相对的，而URL则必须提供足够的信息来定位。

path 文件保存路径

我们可以根据以下的数据类型选择

{
            //{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"},
            {"",        "*/*"}
        };

关键词：Intent Uri setDataAndType(data,type);

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