Create new time picker dialog each time as needed

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

@@ -5,24 +5,29 @@
 
     <ImageButton
         android:id="@+id/backspace"
-        android:layout_width="72dp"
-        android:layout_height="72dp"
+        android:layout_width="@dimen/header_height"
+        android:layout_height="@dimen/header_height"
         android:src="@drawable/ic_backspace_24dp"
         android:background="?selectableItemBackground"
         android:layout_alignParentEnd="true"
         android:layout_alignParentTop="true"/>
 
+    <!-- TODO: Consider changing to TextView if you don't
+    want the cursor after all. A reason you may want to do
+     so is the cursor is getting cut off, most likely because
+     of the text size being larger than the view bounds. You can
+     probably solve this by adding some padding. Another reason is
+     the cursor looks ugly with it blinking. -->
     <EditText
         android:id="@+id/input"
         android:layout_width="wrap_content"
-        android:layout_height="72dp"
+        android:layout_height="@dimen/header_height"
         android:layout_centerHorizontal="true"
         android:layout_alignParentTop="true"
         android:background="@android:color/transparent"
-        android:textSize="40sp"
+        android:textSize="@dimen/time_input_text_size"
         android:focusable="false"
-        android:focusableInTouchMode="false"
-        android:cursorVisible="true"/>
+        android:focusableInTouchMode="false"/>
 
     <View
         android:id="@+id/divider"
@@ -31,13 +36,10 @@
         android:background="?android:listDivider"
         android:layout_below="@id/input"/>
 
-    <!-- TODO: Your height attr is being ignored because
-    you constrained this below and above the header and
-    footer views -->
     <com.philliphsu.clock2.editalarm.NumpadTimePicker
         android:id="@+id/number_grid"
         android:layout_width="match_parent"
-        android:layout_height="270dp"
+        android:layout_height="@dimen/numpad_height"
         android:layout_below="@id/divider"/>
 
     <LinearLayout

app/src/main/res/values/dimens.xml

@@ -11,4 +11,9 @@
     <dimen name="alarm_time_text_size">48sp</dimen>
     <dimen name="app_bar_height">180dp</dimen>
     <dimen name="text_margin">16dp</dimen>
+    
+    <!-- NumpadTimePickerDialog -->
+    <dimen name="header_height">72dp</dimen>
+    <dimen name="numpad_height">270dp</dimen>
+    <dimen name="time_input_text_size">40sp</dimen>
 </resources>