Glimpse: Try to set proper mime type when sharing media

We also have to grant read URI permission in case
the receiving end doesn't have the read media permission.

Change-Id: I28b77b680bdff123a0c737eb41ddcdbe34dba1cb

app/src/main/java/org/lineageos/glimpse/ext/Intent.kt

@@ -6,13 +6,22 @@
 package org.lineageos.glimpse.ext
 
 import android.content.Intent
-import android.net.Uri
 import org.lineageos.glimpse.models.Media
+import org.lineageos.glimpse.models.MediaType.IMAGE
+import org.lineageos.glimpse.models.MediaType.VIDEO
 
-fun Intent.shareIntent(vararg uris: Uri) = apply {
+fun Intent.shareIntent(vararg medias: Media) = apply {
     action = Intent.ACTION_SEND_MULTIPLE
-    putParcelableArrayListExtra(Intent.EXTRA_STREAM, uris.toCollection(ArrayList()))
-    type = "*/*"
+    putParcelableArrayListExtra(
+        Intent.EXTRA_STREAM,
+        medias.map { it.externalContentUri }.toCollection(ArrayList())
+    )
+    type = when {
+        medias.all { it.mediaType == IMAGE } -> "image/*"
+        medias.all { it.mediaType == VIDEO } -> "video/*"
+        else -> "*/*"
+    }
+    flags = Intent.FLAG_GRANT_READ_URI_PERMISSION
 }
 
 fun Intent.editIntent(media: Media) = apply {

app/src/main/java/org/lineageos/glimpse/fragments/MediaViewerFragment.kt

@@ -280,7 +280,7 @@ class MediaViewerFragment : Fragment(
 
         shareButton.setOnClickListener {
             mediaViewerAdapter.getMediaFromMediaStore(viewPager.currentItem)?.let {
-                val intent = Intent().shareIntent(it.externalContentUri)
+                val intent = Intent().shareIntent(it)
                 startActivity(Intent.createChooser(intent, null))
             }
         }