How to get generic (top level) mime type of URI-CodePudding

I have an array of supported file (mime) types

arrayOf(
    "image/*,
    "video/*",
    "audio/*",
    "pdf/*"
)

and I do have a URI for a selected file. When I get the URI type using content resolver it gives me the specific file type like "image/png".

contentResolver.getType(uri) // returns "image/png"

Is there any way to get the high-level mime type i.e. "image/*"? If not, what is the best way to manually check if the file type is in my array?

CodePudding user response：

As mentioned in the comment, you can just use the mime type string that you get & do string manipulation to fit to your needs.

Example:

private fun getTopLevelMimeType(type: String): String {
        return type.substring(0, type.indexOf("/")   1)   "*"
    }

Usage:

val topLevelMimeType = getTopLevelMimeType("image/png")
        Log.d("topLevelMimeType", topLevelMimeType)//logs "image/*"

CodePudding user response：

Apparently, there is no way Android SDK does it for us, so we have to do it manually.

private fun isTypeSupported(contentResolver: ContentResolver?, uri: Uri): Boolean = contentResolver?.let { cr ->
    val type = cr.getType(uri)
    getSupportedFileTypes().any { type?.contains(it.dropLast(1)) ?: false }
} ?: false

CodePudding user response：

val supportedFileTypes = arrayOf(
  "image/*",
  "video/*",
  "audio/*",
  "pdf/*"
)

fun isTypeSupported(type: String): Boolean {
  return supportedFileTypes.contains(type.substringBefore("/")   "/*" )
}

println(isTypeSupported("image/png"))