diff --git a/app/src/main/res/layout-land/layout_about_app.xml b/app/src/main/res/layout-land/layout_about_app.xml
@@ -27,7 +27,7 @@
                 android:id="@+id/txt_about_name" android:layout_margin="8dp"
                 android:layout_height="wrap_content" android:layout_width="wrap_content"
                 android:text="@string/app_name"
-                android:gravity="center" android:textSize="@dimen/text_size_huge"
+                android:gravity="center" android:textSize="?attr/text_size_huge"
                 android:textColor="?attr/date_buttonSelector" android:textStyle="bold"
                 android:textAppearance="?android:attr/textAppearanceLarge" />
 

diff --git a/app/src/main/res/layout-land/layout_empty_alarmlist.xml b/app/src/main/res/layout-land/layout_empty_alarmlist.xml
@@ -33,7 +33,7 @@
     <TextView
         android:id="@+id/emptyView_text" style="@style/Base.TextAppearance.AppCompat.Headline"
         android:layout_width="wrap_content" android:layout_height="wrap_content"
-        android:text="@string/configLabel_alarmClock_emptyMsg" android:textColor="#ff757575" android:textSize="@dimen/text_size_huge" android:textStyle="bold"
+        android:text="@string/configLabel_alarmClock_emptyMsg" android:textColor="#ff757575" android:textSize="?attr/text_size_huge" android:textStyle="bold"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toBottomOf="@+id/emptyView_image" />

diff --git a/app/src/main/res/layout-land/layout_empty_widgetlist.xml b/app/src/main/res/layout-land/layout_empty_widgetlist.xml
@@ -33,7 +33,7 @@
     <TextView
         android:id="@+id/emptyView_text" style="@style/Base.TextAppearance.AppCompat.Headline"
         android:layout_width="wrap_content" android:layout_height="wrap_content"
-        android:text="@string/configLabel_widgetList_emptyMsg" android:textColor="#ff757575" android:textSize="@dimen/text_size_huge" android:textStyle="bold"
+        android:text="@string/configLabel_widgetList_emptyMsg" android:textColor="#ff757575" android:textSize="?attr/text_size_huge" android:textStyle="bold"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toBottomOf="@+id/emptyView_image" />

diff --git a/app/src/main/res/layout-land/layout_listitem_alarmtime.xml b/app/src/main/res/layout-land/layout_listitem_alarmtime.xml
@@ -35,7 +35,7 @@
         android:layout_width="wrap_content" android:layout_height="wrap_content"
 
         android:textColor="?attr/text_buttonSelector" android:gravity="center"
-        android:textSize="@dimen/text_size_small" android:maxLines="1" android:ellipsize="end"
+        android:textSize="?attr/text_size_small" android:maxLines="1" android:ellipsize="end"
         tools:text="1h 30m before" android:minEms="5"
 
         app:layout_constraintVertical_chainStyle="packed"
@@ -76,7 +76,7 @@
         tools:text="June 21, 2019"
         android:textColor="?attr/text_buttonSelector"
         android:gravity="center_horizontal"
-        android:textSize="@dimen/text_size_small" android:maxLines="1" android:ellipsize="end" android:textStyle="bold"
+        android:textSize="?attr/text_size_small" android:maxLines="1" android:ellipsize="end" android:textStyle="bold"
         app:layout_constraintHorizontal_bias="1"
         app:layout_constraintStart_toStartOf="@id/text_datetime"
         app:layout_constraintEnd_toEndOf="@+id/text_datetime"
@@ -89,7 +89,7 @@
         android:layout_margin="8dp"
         tools:text="~15m\nfrom now"
         android:gravity="center"
-        android:textSize="@dimen/text_size_xsmall" android:maxLines="3" android:ellipsize="end"
+        android:textSize="?attr/text_size_xsmall" android:maxLines="3" android:ellipsize="end"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintTop_toBottomOf="@+id/text_date"

diff --git a/app/src/main/res/layout-v11/layout_listitem_twoline.xml b/app/src/main/res/layout-v11/layout_listitem_twoline.xml
@@ -50,7 +50,7 @@
             android:id="@android:id/text2"
             android:textAppearance="?android:attr/textAppearanceSmall"
             android:textColor="?android:attr/textColorAlertDialogListItem"
-            android:textSize="@dimen/text_size_small"
+            android:textSize="?attr/text_size_small"
             android:layout_width="match_parent" android:layout_height="wrap_content"
             android:duplicateParentState="true"
             android:layout_marginTop="-6dp" android:layout_marginBottom="8dp"

diff --git a/app/src/main/res/layout-v11/layout_listitem_twoline_alt.xml b/app/src/main/res/layout-v11/layout_listitem_twoline_alt.xml
@@ -33,7 +33,7 @@
             android:id="@android:id/text2"
             android:textAppearance="?android:attr/textAppearanceSmall"
             android:textColor="?android:attr/textColorAlertDialogListItem"
-            android:textSize="@dimen/text_size_small"
+            android:textSize="?attr/text_size_small"
             android:layout_width="match_parent" android:layout_height="wrap_content"
             android:duplicateParentState="true"
             android:layout_marginTop="-6dp" android:layout_marginBottom="8dp"

diff --git a/app/src/main/res/layout-v11/layout_listitem_widgets.xml b/app/src/main/res/layout-v11/layout_listitem_widgets.xml
@@ -33,7 +33,7 @@
 
         <TextView
             android:id="@+id/text3"
-            android:textStyle="bold" android:textSize="@dimen/text_size_xsmall" android:maxEms="3"
+            android:textStyle="bold" android:textSize="?attr/text_size_xsmall" android:maxEms="3"
             tools:text="123" tools:ignore="SmallSp"
             android:layout_width="wrap_content" android:layout_height="wrap_content" />
     </LinearLayout>

diff --git a/app/src/main/res/layout/info_time_note.xml b/app/src/main/res/layout/info_time_note.xml
@@ -40,7 +40,7 @@
                       android:text=""
                       tools:text="12h 15m"
                       android:gravity="center"
-                      android:textSize="@dimen/text_size_xlarge"
+                      android:textSize="?attr/text_size_xlarge"
                       android:singleLine="true"
                       android:ellipsize="marquee"/>
 
@@ -52,7 +52,7 @@
                   android:text=""
                   tools:text="until"
                   android:layout_gravity="center_horizontal"
-                  android:textSize="@dimen/text_size_small"
+                  android:textSize="?attr/text_size_small"
                   android:singleLine="true"
                   android:gravity="center"/>
 
@@ -61,7 +61,7 @@
                   android:text=""
                   tools:text="astronomical twilight"
                   android:layout_gravity="center_horizontal"
-                  android:textSize="@dimen/text_size_large"
+                  android:textSize="?attr/text_size_large"
                   android:gravity="center" android:maxWidth="@dimen/clock_note_maxwidth"
                   android:layout_margin="0dp"/>
 

diff --git a/app/src/main/res/layout/info_time_solsticequinox1.xml b/app/src/main/res/layout/info_time_solsticequinox1.xml
@@ -106,15 +106,15 @@
             <TextView
                 android:layout_width="wrap_content" android:layout_height="wrap_content"
                 android:id="@+id/text_date_equinox_vernal"
-                android:textSize="@dimen/text_size_small" android:antialias="true"
+                android:textSize="?attr/text_size_small" android:antialias="true"
                 android:textColor="@drawable/txt_equinox_vernal"
                 android:singleLine="true" android:ellipsize="marquee"
                 tools:text="March 20, 2016; 9:00 PM" />
             <TextView
                 android:layout_width="wrap_content" android:layout_height="wrap_content"
                 android:id="@+id/text_date_equinox_vernal_note"
                 tools:text="21d 6h 5m  from now"
-                android:textSize="@dimen/text_size_small" android:antialias="true"
+                android:textSize="?attr/text_size_small" android:antialias="true"
                 android:layout_marginBottom="8dp" />
         </LinearLayout>
         <ImageButton android:visibility="gone"
@@ -168,15 +168,15 @@
             <TextView
                 android:layout_width="wrap_content" android:layout_height="wrap_content"
                 android:id="@+id/text_date_solstice_summer"
-                android:textSize="@dimen/text_size_small" android:antialias="true"
+                android:textSize="?attr/text_size_small" android:antialias="true"
                 android:textColor="@drawable/txt_solstice_summer"
                 android:singleLine="true" android:ellipsize="marquee"
                 tools:text="June 20, 2016; 9:00 PM" />
             <TextView
                 android:layout_width="wrap_content" android:layout_height="wrap_content"
                 android:id="@+id/text_date_solstice_summer_note"
                 tools:text="21d 6h 5m  from now"
-                android:textSize="@dimen/text_size_small" android:antialias="true"
+                android:textSize="?attr/text_size_small" android:antialias="true"
                 android:layout_marginBottom="8dp" />
         </LinearLayout>
         <ImageButton
@@ -231,7 +231,7 @@
             <TextView
                 android:layout_width="wrap_content" android:layout_height="wrap_content"
                 android:id="@+id/text_date_equinox_autumnal"
-                android:textSize="@dimen/text_size_small" android:antialias="true"
+                android:textSize="?attr/text_size_small" android:antialias="true"
                 android:textColor="@drawable/txt_equinox_autumnal"
                 android:singleLine="true" android:ellipsize="marquee"
                 tools:text="September 22, 2016; 9:00 PM" />
@@ -240,7 +240,7 @@
                 android:layout_width="wrap_content" android:layout_height="wrap_content"
                 android:id="@+id/text_date_equinox_autumnal_note"
                 tools:text="21d 6h 5m  from now"
-                android:textSize="@dimen/text_size_small" android:antialias="true"
+                android:textSize="?attr/text_size_small" android:antialias="true"
                 android:layout_marginBottom="8dp" />
         </LinearLayout>
         <ImageButton android:visibility="gone"
@@ -294,15 +294,15 @@
             <TextView
                 android:layout_width="wrap_content" android:layout_height="wrap_content"
                 android:id="@+id/text_date_solstice_winter"
-                android:textSize="@dimen/text_size_small" android:antialias="true"
+                android:textSize="?attr/text_size_small" android:antialias="true"
                 android:textColor="@drawable/txt_solstice_winter"
                 android:singleLine="true" android:ellipsize="marquee"
                 tools:text="December 21, 2016; 9:00 PM" />
             <TextView
                 android:layout_width="wrap_content" android:layout_height="wrap_content"
                 android:id="@+id/text_date_solstice_winter_note"
                 tools:text="21d 6h 5m  from now"
-                android:textSize="@dimen/text_size_small" android:antialias="true"
+                android:textSize="?attr/text_size_small" android:antialias="true"
                 android:layout_marginBottom="8dp" />
         </LinearLayout>
         <ImageButton android:visibility="gone"

diff --git a/app/src/main/res/layout/layout_about_app.xml b/app/src/main/res/layout/layout_about_app.xml
@@ -27,7 +27,7 @@
                 android:id="@+id/txt_about_name"
                 android:layout_height="wrap_content" android:layout_width="wrap_content"
                 android:text="@string/app_name"
-                android:gravity="center" android:textSize="@dimen/text_size_huge"
+                android:gravity="center" android:textSize="?attr/text_size_huge"
                 android:textColor="?attr/date_buttonSelector" android:textStyle="bold"
                 android:textAppearance="?android:attr/textAppearanceLarge" />
 

diff --git a/app/src/main/res/layout/layout_dialog_alarmrepeat.xml b/app/src/main/res/layout/layout_dialog_alarmrepeat.xml
@@ -35,43 +35,43 @@
             android:id="@+id/alarmOption_repeat_sun" android:tag="1"
             android:layout_width="0dp" android:layout_weight="1"
             android:layout_height="wrap_content"
-            android:textSize="@dimen/text_size_small" android:padding="0dp" />
+            android:textSize="?attr/text_size_small" android:padding="0dp" />
 
         <ToggleButton
             android:id="@+id/alarmOption_repeat_mon" android:tag="2"
             android:layout_width="0dp" android:layout_weight="1"
             android:layout_height="wrap_content"
-            android:textSize="@dimen/text_size_small" android:padding="0dp" />
+            android:textSize="?attr/text_size_small" android:padding="0dp" />
 
         <ToggleButton
             android:id="@+id/alarmOption_repeat_tue" android:tag="3"
             android:layout_width="0dp" android:layout_weight="1"
             android:layout_height="wrap_content"
-            android:textSize="@dimen/text_size_small" android:padding="0dp" />
+            android:textSize="?attr/text_size_small" android:padding="0dp" />
 
         <ToggleButton
             android:id="@+id/alarmOption_repeat_wed" android:tag="4"
             android:layout_width="0dp" android:layout_weight="1"
             android:layout_height="wrap_content"
-            android:textSize="@dimen/text_size_small" android:padding="0dp" />
+            android:textSize="?attr/text_size_small" android:padding="0dp" />
 
         <ToggleButton
             android:id="@+id/alarmOption_repeat_thu" android:tag="5"
             android:layout_width="0dp" android:layout_weight="1"
             android:layout_height="wrap_content"
-            android:textSize="@dimen/text_size_small" android:padding="0dp" />
+            android:textSize="?attr/text_size_small" android:padding="0dp" />
 
         <ToggleButton
             android:id="@+id/alarmOption_repeat_fri" android:tag="6"
             android:layout_width="0dp" android:layout_weight="1"
             android:layout_height="wrap_content"
-            android:textSize="@dimen/text_size_small" android:padding="0dp" />
+            android:textSize="?attr/text_size_small" android:padding="0dp" />
 
         <ToggleButton
             android:id="@+id/alarmOption_repeat_sat" android:tag="7"
             android:layout_width="0dp" android:layout_weight="1"
             android:layout_height="wrap_content"
-            android:textSize="@dimen/text_size_small" android:padding="0dp" />
+            android:textSize="?attr/text_size_small" android:padding="0dp" />
 
     </LinearLayout>
 

diff --git a/app/src/main/res/layout/layout_dialog_worldmap.xml b/app/src/main/res/layout/layout_dialog_worldmap.xml
@@ -78,7 +78,7 @@
             android:gravity="center" android:layout_gravity="center"
             android:visibility="gone"
             android:layout_margin="16dp"
-            android:textSize="@dimen/text_size_small"
+            android:textSize="?attr/text_size_small"
             android:text="@string/feature_not_supported_by_source" />
 
     </FrameLayout>

diff --git a/app/src/main/res/layout/layout_empty_alarmlist.xml b/app/src/main/res/layout/layout_empty_alarmlist.xml
@@ -33,7 +33,7 @@
     <TextView
         android:id="@+id/emptyView_text" style="@style/Base.TextAppearance.AppCompat.Headline"
         android:layout_width="wrap_content" android:layout_height="wrap_content"
-        android:text="@string/configLabel_alarmClock_emptyMsg" android:textColor="#ff757575" android:textSize="@dimen/text_size_huge" android:textStyle="bold"
+        android:text="@string/configLabel_alarmClock_emptyMsg" android:textColor="#ff757575" android:textSize="?attr/text_size_huge" android:textStyle="bold"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintBottom_toBottomOf="@+id/guideline" />

diff --git a/app/src/main/res/layout/layout_empty_placeslist.xml b/app/src/main/res/layout/layout_empty_placeslist.xml
@@ -32,7 +32,7 @@
     <TextView
         android:id="@+id/emptyView_text" style="@style/Base.TextAppearance.AppCompat.Headline"
         android:layout_width="wrap_content" android:layout_height="wrap_content"
-        android:text="@string/configLabel_places_emptyMsg" android:textColor="#ff757575" android:textSize="@dimen/text_size_huge" android:textStyle="bold"
+        android:text="@string/configLabel_places_emptyMsg" android:textColor="#ff757575" android:textSize="?attr/text_size_huge" android:textStyle="bold"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintBottom_toBottomOf="@+id/guideline" />

diff --git a/app/src/main/res/layout/layout_empty_widgetlist.xml b/app/src/main/res/layout/layout_empty_widgetlist.xml
@@ -33,7 +33,7 @@
     <TextView
         android:id="@+id/emptyView_text" style="@style/Base.TextAppearance.AppCompat.Headline"
         android:layout_width="wrap_content" android:layout_height="wrap_content"
-        android:text="@string/configLabel_widgetList_emptyMsg" android:textColor="#ff757575" android:textSize="@dimen/text_size_huge" android:textStyle="bold"
+        android:text="@string/configLabel_widgetList_emptyMsg" android:textColor="#ff757575" android:textSize="?attr/text_size_huge" android:textStyle="bold"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintBottom_toBottomOf="@+id/guideline" />

diff --git a/app/src/main/res/layout/layout_listitem_alarmtime.xml b/app/src/main/res/layout/layout_listitem_alarmtime.xml
@@ -30,7 +30,7 @@
         android:layout_width="wrap_content" android:layout_height="wrap_content"
 
         android:textColor="?attr/text_buttonSelector" android:gravity="center"
-        android:textSize="@dimen/text_size_small" android:maxLines="1" android:ellipsize="end"
+        android:textSize="?attr/text_size_small" android:maxLines="1" android:ellipsize="end"
         tools:text="1h 30m before" android:minEms="5"
 
         app:layout_constraintStart_toStartOf="@+id/text_datetime"
@@ -78,7 +78,7 @@
         tools:text="June 21, 2019"
         android:textColor="?attr/text_buttonSelector"
         android:gravity="center_horizontal"
-        android:textSize="@dimen/text_size_small" android:maxLines="1" android:ellipsize="end" android:textStyle="bold"
+        android:textSize="?attr/text_size_small" android:maxLines="1" android:ellipsize="end" android:textStyle="bold"
         app:layout_constraintHorizontal_bias="1"
         app:layout_constraintStart_toStartOf="@id/text_datetime"
         app:layout_constraintEnd_toEndOf="@+id/text_datetime"
@@ -91,7 +91,7 @@
         android:layout_marginLeft="16dp" android:layout_marginTop="8dp" android:layout_marginRight="16dp" android:layout_marginBottom="8dp"
         tools:text="~15m\nfrom now"
         android:gravity="end"
-        android:textSize="@dimen/text_size_xsmall" android:maxLines="3" android:ellipsize="end"
+        android:textSize="?attr/text_size_xsmall" android:maxLines="3" android:ellipsize="end"
         app:layout_constraintStart_toEndOf="@+id/text_datetime"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintTop_toTopOf="parent"

diff --git a/app/src/main/res/layout/layout_listitem_checkedtwoline.xml b/app/src/main/res/layout/layout_listitem_checkedtwoline.xml
@@ -55,7 +55,7 @@
             android:id="@android:id/text2"
             android:textAppearance="?android:attr/textAppearanceSmall"
             android:textColor="?attr/textColorAlertDialogListItem"
-            android:textSize="@dimen/text_size_small"
+            android:textSize="?attr/text_size_small"
             android:layout_width="match_parent" android:layout_height="wrap_content"
             android:duplicateParentState="true"
             android:layout_marginTop="0dp" android:layout_marginBottom="8dp"

diff --git a/app/src/main/res/layout/layout_listitem_timezone.xml b/app/src/main/res/layout/layout_listitem_timezone.xml
@@ -51,7 +51,7 @@
             style="?android:attr/dropDownItemStyle"
             android:id="@android:id/text2"
             android:textAppearance="?android:attr/textAppearanceSmall"
-            android:textSize="@dimen/text_size_small"
+            android:textSize="?attr/text_size_small"
             android:singleLine="true"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"

diff --git a/app/src/main/res/layout/layout_listitem_twoline.xml b/app/src/main/res/layout/layout_listitem_twoline.xml
@@ -50,7 +50,7 @@
             android:id="@android:id/text2"
             android:textAppearance="?android:attr/textAppearanceSmall"
             android:textColor="@color/text_alertDialogListItem"
-            android:textSize="@dimen/text_size_small"
+            android:textSize="?attr/text_size_small"
             android:layout_width="match_parent" android:layout_height="wrap_content"
             android:duplicateParentState="true"
             android:layout_marginTop="-6dp" android:layout_marginBottom="8dp"

diff --git a/app/src/main/res/layout/layout_listitem_twoline_alt.xml b/app/src/main/res/layout/layout_listitem_twoline_alt.xml
@@ -33,7 +33,7 @@
             android:id="@android:id/text2"
             android:textAppearance="?android:attr/textAppearanceSmall"
             android:textColor="@color/text_alertDialogListItem"
-            android:textSize="@dimen/text_size_small"
+            android:textSize="?attr/text_size_small"
             android:layout_width="match_parent" android:layout_height="wrap_content"
             android:duplicateParentState="true"
             android:layout_marginTop="-6dp" android:layout_marginBottom="8dp"

diff --git a/app/src/main/res/layout/layout_listitem_widgets.xml b/app/src/main/res/layout/layout_listitem_widgets.xml
@@ -33,7 +33,7 @@
 
         <TextView
             android:id="@+id/text3"
-            android:textStyle="bold" android:textSize="@dimen/text_size_xsmall" android:maxEms="3"
+            android:textStyle="bold" android:textSize="?attr/text_size_xsmall" android:maxEms="3"
             tools:text="123" tools:ignore="SmallSp"
             android:layout_width="wrap_content" android:layout_height="wrap_content" />
     </LinearLayout>