diff --git a/app/build.gradle b/app/build.gradle
index eb716e9d1f..6246756c33 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -21,6 +21,9 @@ android {
                 arguments = ["room.schemaLocation": "$projectDir/schemas".toString()]
             }
         }
+
+        // https://developer.android.com/guide/topics/graphics/vector-drawable-resources
+        vectorDrawables.useSupportLibrary = true
     }
     signingConfigs {
         release {
diff --git a/app/src/main/res/layout/action_button.xml b/app/src/main/res/layout/action_button.xml
index da2cdb5c00..6b48b6d71d 100644
--- a/app/src/main/res/layout/action_button.xml
+++ b/app/src/main/res/layout/action_button.xml
@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <ImageButton xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     style="@style/Widget.AppCompat.Toolbar.Button.Navigation"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:src="@drawable/baseline_folder_24" />
+    app:srcCompat="@drawable/baseline_folder_24" />
diff --git a/app/src/main/res/layout/fragment_account.xml b/app/src/main/res/layout/fragment_account.xml
index 30b3ee1074..b19ce8d989 100644
--- a/app/src/main/res/layout/fragment_account.xml
+++ b/app/src/main/res/layout/fragment_account.xml
@@ -343,7 +343,7 @@
                 android:layout_marginStart="12dp"
                 android:background="@null"
                 android:contentDescription="@string/title_legend_default_color"
-                android:src="@drawable/baseline_delete_24"
+                app:srcCompat="@drawable/baseline_delete_24"
                 app:layout_constraintBottom_toBottomOf="@id/btnColor"
                 app:layout_constraintStart_toEndOf="@id/vwColor"
                 app:layout_constraintTop_toTopOf="@id/btnColor" />
diff --git a/app/src/main/res/layout/fragment_accounts.xml b/app/src/main/res/layout/fragment_accounts.xml
index 320627feab..3cec997b3a 100644
--- a/app/src/main/res/layout/fragment_accounts.xml
+++ b/app/src/main/res/layout/fragment_accounts.xml
@@ -47,7 +47,7 @@
         android:layout_height="wrap_content"
         android:layout_gravity="end|bottom"
         android:layout_margin="@dimen/fab_padding"
-        android:src="@drawable/baseline_edit_24"
+        app:srcCompat="@drawable/baseline_edit_24"
         android:tint="@color/colorActionForeground"
         android:tooltipText="@string/title_compose"
         app:backgroundTint="?attr/colorAccent" />
@@ -58,7 +58,7 @@
         android:layout_height="wrap_content"
         android:layout_gravity="end|bottom"
         android:layout_margin="@dimen/fab_padding"
-        android:src="@drawable/baseline_add_24"
+        app:srcCompat="@drawable/baseline_add_24"
         android:tint="@color/colorActionForeground"
         android:tooltipText="@string/title_add"
         app:backgroundTint="?attr/colorAccent" />
diff --git a/app/src/main/res/layout/fragment_answers.xml b/app/src/main/res/layout/fragment_answers.xml
index 8b9091d52e..b45204ae52 100644
--- a/app/src/main/res/layout/fragment_answers.xml
+++ b/app/src/main/res/layout/fragment_answers.xml
@@ -47,7 +47,7 @@
         android:layout_height="wrap_content"
         android:layout_gravity="end|bottom"
         android:layout_margin="@dimen/fab_padding"
-        android:src="@drawable/baseline_add_24"
+        app:srcCompat="@drawable/baseline_add_24"
         android:tint="@color/colorActionForeground"
         android:tooltipText="@string/title_add"
         app:backgroundTint="?attr/colorAccent" />
diff --git a/app/src/main/res/layout/fragment_compose.xml b/app/src/main/res/layout/fragment_compose.xml
index ec59c16f42..9445ca909b 100644
--- a/app/src/main/res/layout/fragment_compose.xml
+++ b/app/src/main/res/layout/fragment_compose.xml
@@ -71,7 +71,7 @@
                 android:layout_marginStart="6dp"
                 android:layout_marginEnd="6dp"
                 android:contentDescription="@string/title_legend_pick"
-                android:src="@drawable/baseline_person_24"
+                app:srcCompat="@drawable/baseline_person_24"
                 app:layout_constraintBottom_toBottomOf="@id/etTo"
                 app:layout_constraintEnd_toEndOf="parent"
                 app:layout_constraintStart_toEndOf="@id/etTo"
@@ -97,7 +97,7 @@
                 android:layout_marginStart="6dp"
                 android:layout_marginEnd="6dp"
                 android:contentDescription="@string/title_legend_pick"
-                android:src="@drawable/baseline_person_24"
+                app:srcCompat="@drawable/baseline_person_24"
                 app:layout_constraintBottom_toBottomOf="@id/etCc"
                 app:layout_constraintEnd_toEndOf="parent"
                 app:layout_constraintStart_toEndOf="@id/etCc"
@@ -123,7 +123,7 @@
                 android:layout_marginStart="6dp"
                 android:layout_marginEnd="6dp"
                 android:contentDescription="@string/title_legend_pick"
-                android:src="@drawable/baseline_person_24"
+                app:srcCompat="@drawable/baseline_person_24"
                 app:layout_constraintBottom_toBottomOf="@id/etBcc"
                 app:layout_constraintEnd_toEndOf="parent"
                 app:layout_constraintStart_toEndOf="@id/etBcc"
@@ -149,7 +149,7 @@
                 android:layout_marginStart="6dp"
                 android:layout_marginEnd="6dp"
                 android:contentDescription="@string/title_show_addresses"
-                android:src="@drawable/baseline_people_24"
+                app:srcCompat="@drawable/baseline_people_24"
                 app:layout_constraintBottom_toBottomOf="@id/etSubject"
                 app:layout_constraintEnd_toEndOf="parent"
                 app:layout_constraintStart_toEndOf="@id/etSubject"
@@ -286,7 +286,7 @@
                 android:layout_height="wrap_content"
                 android:layout_marginEnd="6dp"
                 android:contentDescription="@string/title_legend_edit"
-                android:src="@drawable/baseline_edit_24"
+                app:srcCompat="@drawable/baseline_edit_24"
                 app:layout_constraintEnd_toStartOf="@+id/ibReferenceImages"
                 app:layout_constraintTop_toTopOf="@id/tvReferenceHint" />
 
@@ -296,7 +296,7 @@
                 android:layout_height="wrap_content"
                 android:layout_marginEnd="6dp"
                 android:contentDescription="@string/title_legend_show_images"
-                android:src="@drawable/baseline_image_24"
+                app:srcCompat="@drawable/baseline_image_24"
                 app:layout_constraintEnd_toEndOf="parent"
                 app:layout_constraintTop_toTopOf="@id/tvReferenceHint" />
 
diff --git a/app/src/main/res/layout/fragment_folders.xml b/app/src/main/res/layout/fragment_folders.xml
index a8884f3b23..54616e0122 100644
--- a/app/src/main/res/layout/fragment_folders.xml
+++ b/app/src/main/res/layout/fragment_folders.xml
@@ -36,7 +36,7 @@
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_close_hint"
-                android:src="@drawable/baseline_close_24"
+                app:srcCompat="@drawable/baseline_close_24"
                 app:layout_constraintBottom_toBottomOf="@id/tvHintActions"
                 app:layout_constraintEnd_toEndOf="parent"
                 app:layout_constraintTop_toTopOf="@id/tvHintActions" />
@@ -71,7 +71,7 @@
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_close_hint"
-                android:src="@drawable/baseline_close_24"
+                app:srcCompat="@drawable/baseline_close_24"
                 app:layout_constraintBottom_toBottomOf="@id/tvHintSync"
                 app:layout_constraintEnd_toEndOf="parent"
                 app:layout_constraintTop_toTopOf="@id/tvHintSync" />
@@ -135,7 +135,7 @@
         android:layout_height="wrap_content"
         android:layout_gravity="end|bottom"
         android:layout_margin="@dimen/fab_padding"
-        android:src="@drawable/baseline_create_new_folder_24"
+        app:srcCompat="@drawable/baseline_create_new_folder_24"
         android:tint="@color/colorActionForeground"
         android:tooltipText="@string/title_add"
         app:backgroundTint="?attr/colorAccent" />
@@ -146,7 +146,7 @@
         android:layout_height="wrap_content"
         android:layout_gravity="center_horizontal|bottom"
         android:layout_margin="@dimen/fab_padding"
-        android:src="@drawable/baseline_warning_24"
+        v="@drawable/baseline_warning_24"
         android:tint="@color/colorActionForeground"
         android:tooltipText="@string/title_compose"
         app:backgroundTint="@color/lightColorWarning" />
diff --git a/app/src/main/res/layout/fragment_identities.xml b/app/src/main/res/layout/fragment_identities.xml
index 0715b5487f..c6b6bff28e 100644
--- a/app/src/main/res/layout/fragment_identities.xml
+++ b/app/src/main/res/layout/fragment_identities.xml
@@ -47,7 +47,7 @@
         android:layout_height="wrap_content"
         android:layout_gravity="end|bottom"
         android:layout_margin="@dimen/fab_padding"
-        android:src="@drawable/baseline_add_24"
+        app:srcCompat="@drawable/baseline_add_24"
         android:tint="@color/colorActionForeground"
         android:tooltipText="@string/title_add"
         app:backgroundTint="?attr/colorAccent" />
diff --git a/app/src/main/res/layout/fragment_legend_compose.xml b/app/src/main/res/layout/fragment_legend_compose.xml
index e40ca6c764..11c70118f6 100644
--- a/app/src/main/res/layout/fragment_legend_compose.xml
+++ b/app/src/main/res/layout/fragment_legend_compose.xml
@@ -23,7 +23,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_pick"
                 android:padding="12dp"
-                android:src="@drawable/baseline_person_24"
+                app:srcCompat="@drawable/baseline_person_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toTopOf="parent" />
 
@@ -45,7 +45,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_cc"
                 android:padding="12dp"
-                android:src="@drawable/baseline_people_24"
+                app:srcCompat="@drawable/baseline_people_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivPick" />
 
@@ -67,7 +67,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_link"
                 android:padding="12dp"
-                android:src="@drawable/baseline_insert_link_24"
+                app:srcCompat="@drawable/baseline_insert_link_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivCC" />
 
@@ -89,7 +89,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_file"
                 android:padding="12dp"
-                android:src="@drawable/baseline_attachment_24"
+                app:srcCompat="@drawable/baseline_attachment_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivLink" />
 
@@ -111,7 +111,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_picture"
                 android:padding="12dp"
-                android:src="@drawable/baseline_image_24"
+                app:srcCompat="@drawable/baseline_image_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivFile" />
 
@@ -133,7 +133,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_photo"
                 android:padding="12dp"
-                android:src="@drawable/baseline_photo_camera_24"
+                app:srcCompat="@drawable/baseline_photo_camera_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivPicture" />
 
@@ -155,7 +155,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_audio"
                 android:padding="12dp"
-                android:src="@drawable/baseline_record_voice_over_24"
+                app:srcCompat="@drawable/baseline_record_voice_over_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivPhoto" />
 
@@ -177,7 +177,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_bold"
                 android:padding="12dp"
-                android:src="@drawable/baseline_format_bold_24"
+                app:srcCompat="@drawable/baseline_format_bold_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivAudio" />
 
@@ -199,7 +199,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_italic"
                 android:padding="12dp"
-                android:src="@drawable/baseline_format_italic_24"
+                app:srcCompat="@drawable/baseline_format_italic_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivBold" />
 
@@ -221,7 +221,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_underline"
                 android:padding="12dp"
-                android:src="@drawable/baseline_format_underlined_24"
+                app:srcCompat="@drawable/baseline_format_underlined_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivItalic" />
 
@@ -243,7 +243,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_text_size"
                 android:padding="12dp"
-                android:src="@drawable/baseline_format_size_24"
+                app:srcCompat="@drawable/baseline_format_size_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivUnderline" />
 
@@ -265,7 +265,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_text_color"
                 android:padding="12dp"
-                android:src="@drawable/baseline_format_color_text_24"
+                app:srcCompat="@drawable/baseline_format_color_text_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivSize" />
 
diff --git a/app/src/main/res/layout/fragment_legend_folders.xml b/app/src/main/res/layout/fragment_legend_folders.xml
index 7d444384bd..8e29d97f9e 100644
--- a/app/src/main/res/layout/fragment_legend_folders.xml
+++ b/app/src/main/res/layout/fragment_legend_folders.xml
@@ -23,7 +23,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_unified"
                 android:padding="12dp"
-                android:src="@drawable/baseline_folder_special_24"
+                app:srcCompat="@drawable/baseline_folder_special_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toTopOf="parent" />
 
@@ -45,7 +45,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_inbox"
                 android:padding="12dp"
-                android:src="@drawable/baseline_inbox_24"
+                app:srcCompat="@drawable/baseline_inbox_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivType" />
 
@@ -67,7 +67,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_drafts"
                 android:padding="12dp"
-                android:src="@drawable/baseline_drafts_24"
+                app:srcCompat="@drawable/baseline_drafts_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivInbox" />
 
@@ -89,7 +89,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_sent"
                 android:padding="12dp"
-                android:src="@drawable/baseline_send_24"
+                app:srcCompat="@drawable/baseline_send_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivDrafts" />
 
@@ -111,7 +111,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_archive"
                 android:padding="12dp"
-                android:src="@drawable/baseline_archive_24"
+                app:srcCompat="@drawable/baseline_archive_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivSent" />
 
@@ -133,7 +133,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_trash"
                 android:padding="12dp"
-                android:src="@drawable/baseline_delete_24"
+                app:srcCompat="@drawable/baseline_delete_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivArchive" />
 
@@ -155,7 +155,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_junk"
                 android:padding="12dp"
-                android:src="@drawable/baseline_flag_24"
+                app:srcCompat="@drawable/baseline_flag_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivTrash" />
 
@@ -177,7 +177,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_primary"
                 android:padding="12dp"
-                android:src="@drawable/baseline_star_24"
+                app:srcCompat="@drawable/baseline_star_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivJunk" />
 
@@ -199,7 +199,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_notify"
                 android:padding="12dp"
-                android:src="@drawable/baseline_notifications_24"
+                app:srcCompat="@drawable/baseline_notifications_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivPrimary" />
 
@@ -221,7 +221,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_subscribed"
                 android:padding="12dp"
-                android:src="@drawable/baseline_bookmark_24"
+                app:srcCompat="@drawable/baseline_bookmark_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivNotify" />
 
@@ -254,7 +254,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_download_fetch"
                 android:padding="12dp"
-                android:src="@drawable/baseline_mail_outline_24"
+                app:srcCompat="@drawable/baseline_mail_outline_24"
                 app:layout_constraintBottom_toBottomOf="@+id/tvDownloadFetchLegend"
                 app:layout_constraintStart_toEndOf="@id/tvDownloadFetch"
                 app:layout_constraintTop_toTopOf="@+id/tvDownloadFetchLegend" />
@@ -288,7 +288,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_sync_keep"
                 android:padding="12dp"
-                android:src="@drawable/baseline_sync_24"
+                app:srcCompat="@drawable/baseline_sync_24"
                 app:layout_constraintBottom_toBottomOf="@+id/tvSyncKeepLegend"
                 app:layout_constraintStart_toEndOf="@id/tvSyncKeep"
                 app:layout_constraintTop_toTopOf="@+id/tvSyncKeepLegend" />
@@ -311,7 +311,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_stop"
                 android:padding="12dp"
-                android:src="@drawable/baseline_stop_24"
+                app:srcCompat="@drawable/baseline_stop_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/tvSyncKeepLegend" />
 
diff --git a/app/src/main/res/layout/fragment_legend_messages.xml b/app/src/main/res/layout/fragment_legend_messages.xml
index 149f09683b..78db8ca6f4 100644
--- a/app/src/main/res/layout/fragment_legend_messages.xml
+++ b/app/src/main/res/layout/fragment_legend_messages.xml
@@ -23,7 +23,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_thread"
                 android:padding="12dp"
-                android:src="@drawable/baseline_message_24"
+                app:srcCompat="@drawable/baseline_message_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toTopOf="parent" />
 
@@ -45,7 +45,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_zoom"
                 android:padding="12dp"
-                android:src="@drawable/baseline_format_size_24"
+                app:srcCompat="@drawable/baseline_format_size_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivThread" />
 
@@ -67,7 +67,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_draft"
                 android:padding="12dp"
-                android:src="@drawable/baseline_edit_24"
+                app:srcCompat="@drawable/baseline_edit_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivZoom" />
 
@@ -89,7 +89,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_snoozed"
                 android:padding="12dp"
-                android:src="@drawable/baseline_timelapse_24"
+                app:srcCompat="@drawable/baseline_timelapse_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivDraft" />
 
@@ -111,7 +111,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_browsed"
                 android:padding="12dp"
-                android:src="@drawable/baseline_playlist_add_24"
+                app:srcCompat="@drawable/baseline_playlist_add_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivSnoozed" />
 
@@ -133,7 +133,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_answered"
                 android:padding="12dp"
-                android:src="@drawable/baseline_reply_24"
+                app:srcCompat="@drawable/baseline_reply_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivBrowsed" />
 
@@ -155,7 +155,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_plain_only"
                 android:padding="12dp"
-                android:src="@drawable/baseline_notes_24"
+                app:srcCompat="@drawable/baseline_notes_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivAnswered" />
 
@@ -177,7 +177,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_receipt"
                 android:padding="12dp"
-                android:src="@drawable/baseline_playlist_add_check_24"
+                app:srcCompat="@drawable/baseline_playlist_add_check_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivPlain" />
 
@@ -199,7 +199,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_attachment"
                 android:padding="12dp"
-                android:src="@drawable/baseline_attachment_24"
+                app:srcCompat="@drawable/baseline_attachment_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivReceipt" />
 
@@ -221,7 +221,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_flagged"
                 android:padding="12dp"
-                android:src="@drawable/baseline_star_24"
+                app:srcCompat="@drawable/baseline_star_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/tvAttachment" />
 
@@ -243,7 +243,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_contacts"
                 android:padding="12dp"
-                android:src="@drawable/baseline_import_contacts_24"
+                app:srcCompat="@drawable/baseline_import_contacts_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivStarred" />
 
@@ -265,7 +265,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_search"
                 android:padding="12dp"
-                android:src="@drawable/baseline_search_24"
+                app:srcCompat="@drawable/baseline_search_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivContacts" />
 
@@ -287,7 +287,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_view"
                 android:padding="12dp"
-                android:src="@drawable/baseline_visibility_24"
+                app:srcCompat="@drawable/baseline_visibility_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivSearch" />
 
@@ -309,7 +309,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_hide"
                 android:padding="12dp"
-                android:src="@drawable/baseline_visibility_off_24"
+                app:srcCompat="@drawable/baseline_visibility_off_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivView" />
 
@@ -331,7 +331,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_download"
                 android:padding="12dp"
-                android:src="@drawable/baseline_cloud_download_24"
+                app:srcCompat="@drawable/baseline_cloud_download_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivHide" />
 
@@ -353,7 +353,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_external_image"
                 android:padding="12dp"
-                android:src="@drawable/baseline_image_24"
+                app:srcCompat="@drawable/baseline_image_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivDownload" />
 
@@ -375,7 +375,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_embedded_image"
                 android:padding="12dp"
-                android:src="@drawable/baseline_photo_library_24"
+                app:srcCompat="@drawable/baseline_photo_library_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivExternalImage" />
 
@@ -397,7 +397,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_broken_image"
                 android:padding="12dp"
-                android:src="@drawable/baseline_broken_image_24"
+                app:srcCompat="@drawable/baseline_broken_image_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivEmbeddedImage" />
 
diff --git a/app/src/main/res/layout/fragment_legend_synchronization.xml b/app/src/main/res/layout/fragment_legend_synchronization.xml
index 20b807a092..97d989b199 100644
--- a/app/src/main/res/layout/fragment_legend_synchronization.xml
+++ b/app/src/main/res/layout/fragment_legend_synchronization.xml
@@ -23,7 +23,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_primary_connected"
                 android:padding="12dp"
-                android:src="@drawable/baseline_folder_24"
+                app:srcCompat="@drawable/baseline_folder_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toTopOf="parent" />
 
@@ -45,7 +45,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_primary_disconnected"
                 android:padding="12dp"
-                android:src="@drawable/baseline_folder_open_24"
+                app:srcCompat="@drawable/baseline_folder_open_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivPrimaryConnected" />
 
@@ -67,7 +67,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_download_on"
                 android:padding="12dp"
-                android:src="@drawable/baseline_mail_24"
+                app:srcCompat="@drawable/baseline_mail_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivPrimaryDisconnected" />
 
@@ -89,7 +89,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_download_off"
                 android:padding="12dp"
-                android:src="@drawable/baseline_mail_outline_24"
+                app:srcCompat="@drawable/baseline_mail_outline_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivDownloadOn" />
 
@@ -111,7 +111,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_synchronize_on"
                 android:padding="12dp"
-                android:src="@drawable/baseline_sync_24"
+                app:srcCompat="@drawable/baseline_sync_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivDownloadOff" />
 
@@ -133,7 +133,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_synchronize_off"
                 android:padding="12dp"
-                android:src="@drawable/baseline_sync_disabled_24"
+                app:srcCompat="@drawable/baseline_sync_disabled_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivSynchronize" />
 
@@ -155,7 +155,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_disconnected"
                 android:padding="12dp"
-                android:src="@drawable/baseline_cloud_off_24"
+                app:srcCompat="@drawable/baseline_cloud_off_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivSynchronizeOff" />
 
@@ -177,7 +177,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_connecting"
                 android:padding="12dp"
-                android:src="@drawable/baseline_cloud_queue_24"
+                app:srcCompat="@drawable/baseline_cloud_queue_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivDisconnected" />
 
@@ -199,7 +199,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_connected"
                 android:padding="12dp"
-                android:src="@drawable/baseline_cloud_24"
+                app:srcCompat="@drawable/baseline_cloud_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivConnecting" />
 
@@ -221,7 +221,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_executing"
                 android:padding="12dp"
-                android:src="@drawable/baseline_dns_24"
+                app:srcCompat="@drawable/baseline_dns_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivConnected" />
 
@@ -243,7 +243,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_synchronizing"
                 android:padding="12dp"
-                android:src="@drawable/baseline_compare_arrows_24"
+                app:srcCompat="@drawable/baseline_compare_arrows_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivExecuting" />
 
@@ -265,7 +265,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_downloading"
                 android:padding="12dp"
-                android:src="@drawable/baseline_cloud_download_24"
+                app:srcCompat="@drawable/baseline_cloud_download_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivSynchronizing" />
 
@@ -287,7 +287,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_closing"
                 android:padding="12dp"
-                android:src="@drawable/baseline_close_24"
+                app:srcCompat="@drawable/baseline_close_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivDownloading" />
 
@@ -309,7 +309,7 @@
                 android:layout_height="wrap_content"
                 android:contentDescription="@string/title_legend_waiting"
                 android:padding="12dp"
-                android:src="@drawable/baseline_hourglass_empty_24"
+                app:srcCompat="@drawable/baseline_hourglass_empty_24"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/ivClosing" />
 
diff --git a/app/src/main/res/layout/fragment_rule.xml b/app/src/main/res/layout/fragment_rule.xml
index 84d54f01c7..afed87a4ab 100644
--- a/app/src/main/res/layout/fragment_rule.xml
+++ b/app/src/main/res/layout/fragment_rule.xml
@@ -150,7 +150,7 @@
                 android:layout_marginStart="6dp"
                 android:layout_marginEnd="6dp"
                 android:contentDescription="@string/title_legend_pick"
-                android:src="@drawable/baseline_person_24"
+                app:srcCompat="@drawable/baseline_person_24"
                 app:layout_constraintBottom_toBottomOf="@id/etSender"
                 app:layout_constraintEnd_toEndOf="parent"
                 app:layout_constraintTop_toTopOf="@id/etSender" />
@@ -214,7 +214,7 @@
                 android:layout_marginStart="6dp"
                 android:layout_marginEnd="6dp"
                 android:contentDescription="@string/title_legend_pick"
-                android:src="@drawable/baseline_person_24"
+                app:srcCompat="@drawable/baseline_person_24"
                 app:layout_constraintBottom_toBottomOf="@id/etRecipient"
                 app:layout_constraintEnd_toEndOf="parent"
                 app:layout_constraintTop_toTopOf="@id/etRecipient" />
@@ -416,7 +416,7 @@
                 android:layout_marginStart="12dp"
                 android:background="@null"
                 android:contentDescription="@string/title_legend_default_color"
-                android:src="@drawable/baseline_delete_24"
+                app:srcCompat="@drawable/baseline_delete_24"
                 app:layout_constraintBottom_toBottomOf="@id/btnColor"
                 app:layout_constraintStart_toEndOf="@id/vwColor"
                 app:layout_constraintTop_toTopOf="@id/btnColor" />
diff --git a/app/src/main/res/layout/fragment_rules.xml b/app/src/main/res/layout/fragment_rules.xml
index 80444e94bf..c020b82dca 100644
--- a/app/src/main/res/layout/fragment_rules.xml
+++ b/app/src/main/res/layout/fragment_rules.xml
@@ -47,7 +47,7 @@
         android:layout_height="wrap_content"
         android:layout_gravity="end|bottom"
         android:layout_margin="@dimen/fab_padding"
-        android:src="@drawable/baseline_add_24"
+        app:srcCompat="@drawable/baseline_add_24"
         android:tint="@color/colorActionForeground"
         android:tooltipText="@string/title_add"
         app:backgroundTint="?attr/colorAccent" />
diff --git a/app/src/main/res/layout/include_nav.xml b/app/src/main/res/layout/include_nav.xml
index 86fc60ffc0..f0c11c2726 100644
--- a/app/src/main/res/layout/include_nav.xml
+++ b/app/src/main/res/layout/include_nav.xml
@@ -57,7 +57,7 @@
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:contentDescription="@string/title_legend_expander"
-        android:src="@drawable/expander"
+        app:srcCompat="@drawable/expander"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toBottomOf="@id/vSeparatorMenu" />
 
diff --git a/app/src/main/res/layout/item_attachment.xml b/app/src/main/res/layout/item_attachment.xml
index 8e45e113dd..02f116d071 100644
--- a/app/src/main/res/layout/item_attachment.xml
+++ b/app/src/main/res/layout/item_attachment.xml
@@ -20,7 +20,7 @@
             android:background="@null"
             android:contentDescription="@string/title_legend_delete"
             android:paddingEnd="12dp"
-            android:src="@drawable/baseline_delete_24"
+            app:srcCompat="@drawable/baseline_delete_24"
             android:visibility="visible"
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toTopOf="parent" />
@@ -30,7 +30,7 @@
             android:layout_width="24dp"
             android:layout_height="24dp"
             android:contentDescription="@string/title_legend_attachment"
-            android:src="@drawable/baseline_attachment_24"
+            app:srcCompat="@drawable/baseline_attachment_24"
             app:layout_constraintStart_toEndOf="@id/ibDelete"
             app:layout_constraintTop_toTopOf="parent" />
 
@@ -67,7 +67,7 @@
             android:layout_height="24dp"
             android:layout_marginStart="6dp"
             android:contentDescription="@string/title_legend_download_state"
-            android:src="@drawable/baseline_cloud_download_24"
+            app:srcCompat="@drawable/baseline_cloud_download_24"
             app:layout_constraintEnd_toStartOf="@+id/ibSave"
             app:layout_constraintStart_toEndOf="@id/tvSize"
             app:layout_constraintTop_toTopOf="parent" />
@@ -79,7 +79,7 @@
             android:background="@null"
             android:contentDescription="@string/title_legend_save"
             android:paddingStart="12dp"
-            android:src="@drawable/baseline_save_24"
+            app:srcCompat="@drawable/baseline_save_24"
             app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintStart_toEndOf="@id/ivStatus"
             app:layout_constraintTop_toTopOf="parent" />
diff --git a/app/src/main/res/layout/item_contact.xml b/app/src/main/res/layout/item_contact.xml
index 58108b9a42..afdb0c4bf4 100644
--- a/app/src/main/res/layout/item_contact.xml
+++ b/app/src/main/res/layout/item_contact.xml
@@ -14,7 +14,7 @@
             android:layout_width="24dp"
             android:layout_height="24dp"
             android:contentDescription="@string/title_legend_avatar"
-            android:src="@drawable/baseline_call_received_24"
+            app:srcCompat="@drawable/baseline_call_received_24"
             app:layout_constraintBottom_toBottomOf="@+id/ivAvatar"
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toTopOf="@+id/ivAvatar" />
@@ -26,7 +26,7 @@
             android:layout_marginStart="6dp"
             android:contentDescription="@string/title_legend_avatar"
             android:padding="3dp"
-            android:src="@drawable/baseline_person_24"
+            app:srcCompat="@drawable/baseline_person_24"
             app:layout_constraintDimensionRatio="1:1"
             app:layout_constraintStart_toEndOf="@id/ivType"
             app:layout_constraintTop_toTopOf="parent" />
@@ -87,7 +87,7 @@
             android:layout_width="24dp"
             android:layout_height="24dp"
             android:contentDescription="@string/title_legend_flagged"
-            android:src="@drawable/baseline_star_24"
+            app:srcCompat="@drawable/baseline_star_24"
             android:visibility="visible"
             app:layout_constraintBottom_toBottomOf="@+id/ivAvatar"
             app:layout_constraintEnd_toEndOf="parent"
diff --git a/app/src/main/res/layout/item_folder.xml b/app/src/main/res/layout/item_folder.xml
index b4caa6402c..82ef3438d3 100644
--- a/app/src/main/res/layout/item_folder.xml
+++ b/app/src/main/res/layout/item_folder.xml
@@ -26,7 +26,7 @@
             android:layout_height="24dp"
             android:layout_marginStart="6dp"
             android:contentDescription="@string/title_legend_connection_state"
-            android:src="@drawable/baseline_cloud_off_24"
+            app:srcCompat="@drawable/baseline_cloud_off_24"
             app:layout_constraintBottom_toBottomOf="@+id/tvName"
             app:layout_constraintStart_toEndOf="@id/vwColor"
             app:layout_constraintTop_toTopOf="@+id/tvName" />
@@ -36,7 +36,7 @@
             android:layout_width="24dp"
             android:layout_height="24dp"
             android:layout_marginStart="6dp"
-            android:src="@drawable/baseline_visibility_24"
+            app:srcCompat="@drawable/baseline_visibility_24"
             app:layout_constraintStart_toEndOf="@id/vwColor"
             app:layout_constraintTop_toTopOf="@+id/tvType" />
 
@@ -57,7 +57,7 @@
             android:contentDescription="@string/title_legend_expander"
             android:paddingStart="12dp"
             android:paddingEnd="12dp"
-            android:src="@drawable/expander"
+            app:srcCompat="@drawable/expander"
             app:layout_constraintBottom_toBottomOf="@+id/paddingBottom"
             app:layout_constraintStart_toEndOf="@+id/vwLevel"
             app:layout_constraintTop_toTopOf="parent" />
@@ -68,7 +68,7 @@
             android:layout_height="24dp"
             android:contentDescription="@string/title_legend_folder_type"
             android:paddingEnd="6dp"
-            android:src="@drawable/baseline_inbox_24"
+            app:srcCompat="@drawable/baseline_inbox_24"
             app:layout_constraintBottom_toBottomOf="@+id/tvType"
             app:layout_constraintStart_toEndOf="@id/ivExpander"
             app:layout_constraintTop_toTopOf="@+id/tvType" />
@@ -79,7 +79,7 @@
             android:layout_height="24dp"
             android:contentDescription="@string/title_unified_folder"
             android:paddingEnd="6dp"
-            android:src="@drawable/baseline_folder_special_24"
+            app:srcCompat="@drawable/baseline_folder_special_24"
             app:layout_constraintBottom_toBottomOf="@+id/tvType"
             app:layout_constraintStart_toEndOf="@id/ivType"
             app:layout_constraintTop_toTopOf="@+id/tvType" />
@@ -90,7 +90,7 @@
             android:layout_height="24dp"
             android:contentDescription="@string/title_legend_notify"
             android:paddingEnd="6dp"
-            android:src="@drawable/baseline_notifications_24"
+            app:srcCompat="@drawable/baseline_notifications_24"
             app:layout_constraintBottom_toBottomOf="@+id/tvName"
             app:layout_constraintStart_toEndOf="@id/ivExpander"
             app:layout_constraintTop_toTopOf="@+id/tvName" />
@@ -101,7 +101,7 @@
             android:layout_height="24dp"
             android:contentDescription="@string/title_legend_notify"
             android:paddingEnd="6dp"
-            android:src="@drawable/baseline_bookmark_24"
+            app:srcCompat="@drawable/baseline_bookmark_24"
             app:layout_constraintBottom_toBottomOf="@+id/tvName"
             app:layout_constraintStart_toEndOf="@id/ivNotify"
             app:layout_constraintTop_toTopOf="@+id/tvName" />
@@ -140,7 +140,7 @@
             android:layout_height="24dp"
             android:layout_marginEnd="12dp"
             android:contentDescription="@string/title_legend_count"
-            android:src="@drawable/baseline_mail_outline_24"
+            app:srcCompat="@drawable/baseline_mail_outline_24"
             app:layout_constraintBottom_toBottomOf="@+id/tvName"
             app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintTop_toTopOf="@+id/tvName" />
@@ -194,7 +194,7 @@
             android:layout_height="24dp"
             android:layout_marginEnd="12dp"
             android:contentDescription="@string/title_legend_sync_state"
-            android:src="@drawable/baseline_sync_24"
+            app:srcCompat="@drawable/baseline_sync_24"
             app:layout_constraintBottom_toBottomOf="@id/tvType"
             app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintTop_toTopOf="@+id/tvType" />
diff --git a/app/src/main/res/layout/item_folder_select.xml b/app/src/main/res/layout/item_folder_select.xml
index 80b557cbd4..875ba67e18 100644
--- a/app/src/main/res/layout/item_folder_select.xml
+++ b/app/src/main/res/layout/item_folder_select.xml
@@ -26,7 +26,7 @@
             android:layout_gravity="center_vertical|center_horizontal"
             android:contentDescription="@string/title_legend_expander"
             android:padding="6dp"
-            android:src="@drawable/expander"
+            app:srcCompat="@drawable/expander"
             app:layout_constraintBottom_toBottomOf="@+id/tvName"
             app:layout_constraintStart_toEndOf="@+id/vwLevel"
             app:layout_constraintTop_toTopOf="@+id/tvName" />
@@ -36,7 +36,7 @@
             android:layout_width="24dp"
             android:layout_height="24dp"
             android:contentDescription="@string/title_legend_folder_type"
-            android:src="@drawable/baseline_inbox_24"
+            app:srcCompat="@drawable/baseline_inbox_24"
             app:layout_constraintBottom_toBottomOf="@+id/tvName"
             app:layout_constraintStart_toEndOf="@+id/ivExpander"
             app:layout_constraintTop_toTopOf="@+id/tvName" />
diff --git a/app/src/main/res/layout/item_image.xml b/app/src/main/res/layout/item_image.xml
index 0e11442309..17db5382a9 100644
--- a/app/src/main/res/layout/item_image.xml
+++ b/app/src/main/res/layout/item_image.xml
@@ -19,7 +19,7 @@
             android:adjustViewBounds="true"
             android:contentDescription="@string/title_legend_show_images"
             android:scaleType="centerInside"
-            android:src="@mipmap/ic_launcher"
+            app:srcCompat="@mipmap/ic_launcher"
             app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toTopOf="parent" />
diff --git a/app/src/main/res/layout/item_nav.xml b/app/src/main/res/layout/item_nav.xml
index 0c12e36d6f..9736b2cb53 100644
--- a/app/src/main/res/layout/item_nav.xml
+++ b/app/src/main/res/layout/item_nav.xml
@@ -16,7 +16,7 @@
             android:layout_height="wrap_content"
             android:layout_marginStart="12dp"
             android:gravity="center_vertical"
-            android:src="@drawable/baseline_mail_outline_24"
+            app:srcCompat="@drawable/baseline_mail_outline_24"
             app:layout_constraintBottom_toBottomOf="parent"
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toTopOf="parent" />