use the Commons way of determining mimetype of multiple uris

app/build.gradle

@@ -37,7 +37,7 @@ android {
 }
 
 dependencies {
-    compile 'com.simplemobiletools:commons:2.30.10'
+    compile 'com.simplemobiletools:commons:2.30.13'
     compile 'com.bignerdranch.android:recyclerview-multiselect:0.2'
     compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
 

app/src/main/kotlin/com/simplemobiletools/filemanager/adapters/ItemsAdapter.kt

@@ -179,7 +179,7 @@ class ItemsAdapter(val activity: SimpleActivity, var mItems: MutableList<FileDir
                 action = Intent.ACTION_SEND_MULTIPLE
                 putParcelableArrayListExtra(Intent.EXTRA_STREAM, uris)
             }
-            type = getMimeType(uris)
+            type = uris.getMimeType()
             addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
 
             try {
@@ -200,19 +200,6 @@ class ItemsAdapter(val activity: SimpleActivity, var mItems: MutableList<FileDir
         }
     }
 
-    private fun getMimeType(uris: List<Uri>): String {
-        val firstMimeType = uris.first().path.getMimeTypeFromPath()
-        val firstMimeGroup = firstMimeType.substringBefore("/")
-
-        uris.forEach {
-            val mimeGroup = it.path.getMimeTypeFromPath().substringBefore("/")
-            if (mimeGroup != firstMimeGroup) {
-                return "*/*"
-            }
-        }
-        return firstMimeType
-    }
-
     private fun copyMoveTo(isCopyOperation: Boolean) {
         val files = ArrayList<File>()
         selectedPositions.forEach { files.add(File(mItems[it].path)) }