change to srcCompat

app/src/main/res/layout-v21/activity_topic_post_row.xml

@@ -95,7 +95,7 @@
                     android:clickable="true"
                     android:contentDescription="@string/post_quote_button"
                     android:focusable="true"
-                    android:src="@drawable/ic_format_quote_unchecked_grey_24dp" />
+                    app:srcCompat="@drawable/ic_format_quote_unchecked_grey_24dp" />
                 <!--<ImageButton
                     android:id="@+id/post_share_button"
                     android:layout_width="@dimen/post_image_button"

app/src/main/res/layout/activity_board.xml

@@ -31,7 +31,7 @@
                 android:layout_marginEnd="4dp"
                 android:background="@null"
                 android:contentDescription="@string/bookmark"
-                android:src="@drawable/ic_bookmark_false_accent_24dp"/>
+                app:srcCompat="@drawable/ic_bookmark_false_accent_24dp"/>
         </android.support.v7.widget.Toolbar>
     </android.support.design.widget.AppBarLayout>
 

app/src/main/res/layout/activity_board_topic.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:id="@+id/topic_row_linear"
     android:layout_width="match_parent"
@@ -47,7 +48,7 @@
             android:layout_height="wrap_content"
             android:background="@null"
             android:contentDescription="@string/child_board_button"
-            android:src="@drawable/ic_arrow_drop_down_accent_24dp" />
+            app:srcCompat="@drawable/ic_arrow_drop_down_accent_24dp" />
     </LinearLayout>
 
     <LinearLayout

app/src/main/res/layout/activity_downloads_row.xml

@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:id="@+id/upper_linear"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
@@ -43,7 +44,7 @@
                 android:layout_height="wrap_content"
                 android:background="@null"
                 android:contentDescription="@string/child_board_button"
-                android:src="@drawable/ic_arrow_drop_down_accent_24dp"/>
+                app:srcCompat="@drawable/ic_arrow_drop_down_accent_24dp"/>
         </LinearLayout>
 
         <LinearLayout

app/src/main/res/layout/activity_topic_post_row.xml

@@ -94,7 +94,7 @@
                     android:clickable="true"
                     android:contentDescription="@string/post_quote_button"
                     android:focusable="true"
-                    android:src="@drawable/ic_format_quote_unchecked_grey_24dp" />
+                    app:srcCompat="@drawable/ic_format_quote_unchecked_grey_24dp" />
                 <!--<ImageButton
                     android:id="@+id/post_share_button"
                     android:layout_width="@dimen/post_image_button"