创建共享
创建Intent并将操作指定为Intent.ACTION_SEND。
valshareintent=intent (intent.action _ send ) )。
指定发送的内容和类型。
//传输文件采用流方式
intent.put extra (intent.extra _ stream,uri.fromfile(file ) fileurl ) ) )。
intent.type='*/* '
发送隐含意图,打开系统共享选择器。
context.start activity (share intent ) )。
获取文件类型(MimeType ) )。
共享文件时,通常需要设置文件类型。 缺省指定类型为*/*。 如果默认类型被共享,则共享将失败,因为某些App不支持此类型。 建议您根据文件路径设置文件类型。
一般文件的mimeType
{'.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 ',' APP/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 ','视频/MP4 ' },
{'.mpc ',' application/vnd.MPO hun.certificate ' },
{'.mpe ',' video/mpeg'},
{'.mpeg ','视频/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 ',' applicat "
ion/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"},
{"", "*/*"}
方式一:通过 ContentResolver 查询 Android 系统提供的 ContentProvider 获取(方便但不稳定)
当 targetSdkVersion >= 24 时,
使用 Uri.fromFile(File file) 获取文件 URI 会报android.os.FileUriExposedException 异常
获取文件的 url
val shareFile = File(shareFilePath)
val fileUri = Uri.fromFile(shareFile)
获取系统的提供的 ContentResolver
val contentResolver = context!!.contentResolver
获取文件MimeType,如 image/png
val fileMimeType = contentResolver.getType(fileUri)
获取文件Type,如 txt
val mime = MimeTypeMap.getSingleton()
val fileType = mime.getExtensionFromMimeType(fileMimeType)
方式二:解析文件信息,通过匹配识别判断:
识别文件后缀,根据后缀名来判断文件类型。
获取文件头信息,转成十六进制字符串后判断文件类型。
object FileUtil {
/**
* 根据文件后缀回去MIME类型
*
* @param file file
* @return string
*/
public fun getMIMEType(file: File): String {
var type = "*/*"
val fName = file.name
//获取后缀名前的分隔符"."在fName中的位置。
val dotIndex = fName.lastIndexOf(".")
if (dotIndex < 0) {
return type
}
/* 获取文件的后缀名*/
val end = fName.substring(dotIndex, fName.length).toLowerCase()
if (TextUtils.isEmpty(end)) {
return type
}
//在MIME和文件类型的匹配表中找到对应的MIME类型。
for (i in MIME_MapTable.indices) {
if (end == MIME_MapTable[i][0]) {
type = MIME_MapTable[i][1]
break
}
}
return type
}
private val MIME_MapTable = arrayOf(
// {后缀名,MIME类型}
arrayOf(".3gp", "video/3gpp"),
arrayOf(".apk", "application/vnd.android.package-archive"),
arrayOf(".asf", "video/x-ms-asf"),
arrayOf(".avi", "video/x-msvideo"),
arrayOf(".bin", "application/octet-stream"),
arrayOf(".bmp", "image/bmp"),
arrayOf(".c", "text/plain"),
arrayOf(".class", "application/octet-stream"),
arrayOf(".conf", "text/plain"),
arrayOf(".cpp", "text/plain"),
arrayOf(".doc", "application/msword"),
arrayOf(".docx", "application/vnd.openxmlformats-officedocument.wordprocessingml.document"),
arrayOf(".xls", "application/vnd.ms-excel"),
arrayOf(".xlsx", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"),
arrayOf(".exe", "application/octet-stream"),
arrayOf(".gif", "image/gif"),
arrayOf(".gtar", "application/x-gtar"),
arrayOf(".gz", "application/x-gzip"),
arrayOf(".h", "text/plain"),
arrayOf(".htm", "text/html"),
arrayOf(".html", "text/html"),
arrayOf(".jar", "application/java-archive"),
arrayOf(".java", "text/plain"),
arrayOf(".jpeg", "image/jpeg"),
arrayOf(".jpg", "image/jpeg"), arrayOf(".js", "application/x-javascript"), arrayOf(".log", "text/plain"),
arrayOf(".m3u", "audio/x-mpegurl"), arrayOf(".m4a", "audio/mp4a-latm"), arrayOf(".m4b", "audio/mp4a-latm"),
arrayOf(".m4p", "audio/mp4a-latm"), arrayOf(".m4u", "video/vnd.mpegurl"), arrayOf(".m4v", "video/x-m4v"), arrayOf(".mov", "video/quicktime"),
arrayOf(".mp2", "audio/x-mpeg"), arrayOf(".mp3", "audio/x-mpeg"), arrayOf(".mp4", "video/mp4"),
arrayOf(".mpc", "application/vnd.mpohun.certificate"), arrayOf(".mpe", "video/mpeg"), arrayOf(".mpeg", "video/mpeg"),
arrayOf(".mpg", "video/mpeg"), arrayOf(".mpg4", "video/mp4"), arrayOf(".mpga", "audio/mpeg"), arrayOf(".msg", "application/vnd.ms-outlook"),
arrayOf(".ogg", "audio/ogg"),
arrayOf(".pdf", "application/pdf"), arrayOf(".png", "image/png"), arrayOf(".pps", "application/vnd.ms-powerpoint"),
arrayOf(".ppt", "application/vnd.ms-powerpoint"), arrayOf(".pptx", "application/vnd.openxmlformats-officedocument.presentationml.presentation"),
arrayOf(".prop", "text/plain"),
arrayOf(".rc", "text/plain"), arrayOf(".rmvb", "audio/x-pn-realaudio"), arrayOf(".rtf", "application/rtf"),
arrayOf(".sh", "text/plain"),
arrayOf(".tar", "application/x-tar"), arrayOf(".tgz", "application/x-compressed"), arrayOf(".txt", "text/plain"),
arrayOf(".wav", "audio/x-wav"),
arrayOf(".wma", "audio/x-ms-wma"), arrayOf(".wmv", "audio/x-ms-wmv"), arrayOf(".wps", "application/vnd.ms-works"),
arrayOf(".xml", "text/plain"), arrayOf(".z", "application/x-compress"), arrayOf(".zip", "application/x-zip-compressed"), arrayOf("", "*/*"))
}