add more thumbnail icons for various file types

src/main/java/eu/siacs/conversations/ui/adapter/MediaPreviewAdapter.java

@@ -62,8 +62,19 @@ public class MediaPreviewAdapter extends RecyclerView.Adapter<MediaPreviewAdapte
             } else if (attachment.getType() == Attachment.Type.RECORDING) {
                 attr = R.attr.media_preview_recording;
             } else {
-                if (attachment.getMime() != null && attachment.getMime().startsWith("audio/")) {
+                final String mime = attachment.getMime();
+                if (mime == null) {
+                    attr = R.attr.media_preview_file;
+                } else if (mime.startsWith("audio/")) {
                     attr = R.attr.media_preview_audio;
+                } else if (mime.equals("text/calendar") || (mime.equals("text/x-vcalendar"))) {
+                    attr = R.attr.media_preview_calendar;
+                } else if (mime.equals("text/x-vcard")) {
+                    attr = R.attr.media_preview_contact;
+                } else if (mime.equals("application/vnd.android.package-archive")) {
+                    attr = R.attr.media_preview_app;
+                } else if (mime.equals("application/zip") || mime.equals("application/rar")) {
+                    attr = R.attr.media_preview_archive;
                 } else {
                     attr = R.attr.media_preview_file;
                 }

src/main/res/values/attrs.xml

@@ -56,6 +56,10 @@
     <attr name="media_preview_recording" format="reference"/>
     <attr name="media_preview_audio" format="reference"/>
     <attr name="media_preview_location" format="reference"/>
+    <attr name="media_preview_contact" format="reference"/>
+    <attr name="media_preview_app" format="reference"/>
+    <attr name="media_preview_calendar" format="reference"/>
+    <attr name="media_preview_archive" format="reference" />
 
 
     <attr name="icon_add_group" format="reference"/>

src/main/res/values/themes.xml

@@ -67,6 +67,10 @@
         <item type="reference" name="media_preview_recording">@drawable/ic_mic_black_48dp</item>
         <item type="reference" name="media_preview_audio">@drawable/ic_headset_black_48dp</item>
         <item type="reference" name="media_preview_location">@drawable/ic_room_black_48dp</item>
+        <item type="reference" name="media_preview_contact">@drawable/ic_person_black_48dp</item>
+        <item type="reference" name="media_preview_app">@drawable/ic_android_black_48dp</item>
+        <item type="reference" name="media_preview_calendar">@drawable/ic_event_black_48dp</item>
+        <item type="reference" name="media_preview_archive">@drawable/ic_archive_black_48dp</item>
 
         <item type="reference" name="icon_add_group">@drawable/ic_group_add_white_24dp</item>
         <item type="reference" name="icon_add_person">@drawable/ic_person_add_white_24dp</item>
@@ -173,6 +177,10 @@
         <item type="reference" name="media_preview_recording">@drawable/ic_mic_white_48dp</item>
         <item type="reference" name="media_preview_audio">@drawable/ic_headset_white_48dp</item>
         <item type="reference" name="media_preview_location">@drawable/ic_room_white_48dp</item>
+        <item type="reference" name="media_preview_contact">@drawable/ic_person_white_48dp</item>
+        <item type="reference" name="media_preview_app">@drawable/ic_android_white_48dp</item>
+        <item type="reference" name="media_preview_calendar">@drawable/ic_event_white_48dp</item>
+        <item type="reference" name="media_preview_archive">@drawable/ic_archive_white_48dp</item>
 
         <item type="reference" name="icon_add_group">@drawable/ic_group_add_white_24dp</item>
         <item type="reference" name="icon_add_person">@drawable/ic_person_add_white_24dp</item>