diff --git a/java/res/values-land/dimens.xml b/java/res/values-land/dimens.xml
index c46a517..496da3d 100644
--- a/java/res/values-land/dimens.xml
+++ b/java/res/values-land/dimens.xml
@@ -21,6 +21,7 @@
 <resources>
     <!-- keyboardHeight = key_height*4 + key_bottom_gap*3, key_height=0.260in -->
     <dimen name="keyboardHeight">1.100in</dimen>
+    <fraction name="minKeyboardHeight">45%p</fraction>
     <!-- key_height + key_bottom_gap = popup_key_height -->
 <!--    <dimen name="key_height">0.260in</dimen>-->
     <dimen name="key_bottom_gap">0.020in</dimen>
diff --git a/java/res/values/attrs.xml b/java/res/values/attrs.xml
index e88b007..7f2a400 100644
--- a/java/res/values/attrs.xml
+++ b/java/res/values/attrs.xml
@@ -80,6 +80,9 @@
         <attr name="keyboardHeight" format="dimension" />
         <!-- Maximum keyboard height, in pixels or percentage of display height -->
         <attr name="maxKeyboardHeight" format="dimension|fraction" />
+        <!-- Minimum keyboard height represented in pixels, percentage of display height if fraction
+             is positive, or percentage of display width if fraction is negative. -->
+        <attr name="minKeyboardHeight" format="dimension|fraction" />
         <!-- Default width of a key, in pixels or percentage of display width. -->
         <attr name="keyWidth" format="dimension|fraction" />
         <!-- Default height of a row (key height + vertical gap), in pixels or percentage of
diff --git a/java/res/values/dimens.xml b/java/res/values/dimens.xml
index 69f962f..82abf3b 100644
--- a/java/res/values/dimens.xml
+++ b/java/res/values/dimens.xml
@@ -21,6 +21,8 @@
 <resources>
     <!-- keyboardHeight = key_height*4 + key_bottom_gap*3, key_height=0.295in -->
     <dimen name="keyboardHeight">1.285in</dimen>
+    <fraction name="maxKeyboardHeight">50%p</fraction>
+    <fraction name="minKeyboardHeight">-61.8%p</fraction>
     <!-- key_height + key_bottom_gap = popup_key_height -->
     <!-- <dimen name="key_height">0.295in</dimen> -->
     <dimen name="key_bottom_gap">0.035in</dimen>
@@ -41,10 +43,11 @@
          to user's finger. -->
     <dimen name="keyboard_vertical_correction">-0.05in</dimen>
 
-    <dimen name="key_letter_size">0.13in</dimen>
-    <dimen name="key_label_text_size">0.083in</dimen>
+    <!-- TODO: use fraction for key letter size and etc. -->
+    <dimen name="key_letter_size">21dip</dimen>
+    <dimen name="key_label_text_size">13dip</dimen>
     <!-- left or right padding of label alignment -->
-    <dimen name="key_label_horizontal_alignment_padding">0.13in</dimen>
+    <dimen name="key_label_horizontal_alignment_padding">21dip</dimen>
     <dimen name="key_preview_height">80sp</dimen>
     <dimen name="key_preview_offset">0.000in</dimen>
     <dimen name="key_preview_text_size_large">36sp</dimen>
diff --git a/java/res/xml-ar/kbd_qwerty.xml b/java/res/xml-ar/kbd_qwerty.xml
index 5faf603..93310bf 100644
--- a/java/res/xml-ar/kbd_qwerty.xml
+++ b/java/res/xml-ar/kbd_qwerty.xml
@@ -21,7 +21,8 @@
 <Keyboard
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
     latin:keyboardHeight="@dimen/keyboardHeight"
-    latin:maxKeyboardHeight="50%p"
+    latin:maxKeyboardHeight="@fraction/maxKeyboardHeight"
+    latin:minKeyboardHeight="@fraction/minKeyboardHeight"
     latin:rowHeight="25%p"
     latin:keyWidth="10%p"
     latin:horizontalGap="@dimen/key_horizontal_gap"
diff --git a/java/res/xml-cs/kbd_qwerty.xml b/java/res/xml-cs/kbd_qwerty.xml
index 0e6e40d..a74f7fa 100644
--- a/java/res/xml-cs/kbd_qwerty.xml
+++ b/java/res/xml-cs/kbd_qwerty.xml
@@ -21,7 +21,8 @@
 <Keyboard
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
     latin:keyboardHeight="@dimen/keyboardHeight"
-    latin:maxKeyboardHeight="50%p"
+    latin:maxKeyboardHeight="@fraction/maxKeyboardHeight"
+    latin:minKeyboardHeight="@fraction/minKeyboardHeight"
     latin:rowHeight="25%p"
     latin:keyWidth="10%p"
     latin:horizontalGap="@dimen/key_horizontal_gap"
diff --git a/java/res/xml-da/kbd_qwerty.xml b/java/res/xml-da/kbd_qwerty.xml
index d9847ae..12ea33c 100644
--- a/java/res/xml-da/kbd_qwerty.xml
+++ b/java/res/xml-da/kbd_qwerty.xml
@@ -21,7 +21,8 @@
 <Keyboard
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
     latin:keyboardHeight="@dimen/keyboardHeight"
-    latin:maxKeyboardHeight="50%p"
+    latin:maxKeyboardHeight="@fraction/maxKeyboardHeight"
+    latin:minKeyboardHeight="@fraction/minKeyboardHeight"
     latin:rowHeight="25%p"
     latin:horizontalGap="@dimen/key_horizontal_gap"
     latin:verticalGap="@dimen/key_bottom_gap"
diff --git a/java/res/xml-de/kbd_qwerty.xml b/java/res/xml-de/kbd_qwerty.xml
index e656966..6ad25b7 100644
--- a/java/res/xml-de/kbd_qwerty.xml
+++ b/java/res/xml-de/kbd_qwerty.xml
@@ -21,7 +21,8 @@
 <Keyboard
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
     latin:keyboardHeight="@dimen/keyboardHeight"
-    latin:maxKeyboardHeight="50%p"
+    latin:maxKeyboardHeight="@fraction/maxKeyboardHeight"
+    latin:minKeyboardHeight="@fraction/minKeyboardHeight"
     latin:rowHeight="25%p"
     latin:keyWidth="10%p"
     latin:horizontalGap="@dimen/key_horizontal_gap"
diff --git a/java/res/xml-fi/kbd_qwerty.xml b/java/res/xml-fi/kbd_qwerty.xml
index ea08d67..e35ab2b 100644
--- a/java/res/xml-fi/kbd_qwerty.xml
+++ b/java/res/xml-fi/kbd_qwerty.xml
@@ -21,7 +21,8 @@
 <Keyboard
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
     latin:keyboardHeight="@dimen/keyboardHeight"
-    latin:maxKeyboardHeight="50%p"
+    latin:maxKeyboardHeight="@fraction/maxKeyboardHeight"
+    latin:minKeyboardHeight="@fraction/minKeyboardHeight"
     latin:rowHeight="25%p"
     latin:horizontalGap="@dimen/key_horizontal_gap"
     latin:verticalGap="@dimen/key_bottom_gap"
diff --git a/java/res/xml-fr-rCA/kbd_qwerty.xml b/java/res/xml-fr-rCA/kbd_qwerty.xml
index f9c2969..e649a1e 100644
--- a/java/res/xml-fr-rCA/kbd_qwerty.xml
+++ b/java/res/xml-fr-rCA/kbd_qwerty.xml
@@ -21,7 +21,8 @@
 <Keyboard
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
     latin:keyboardHeight="@dimen/keyboardHeight"
-    latin:maxKeyboardHeight="50%p"
+    latin:maxKeyboardHeight="@fraction/maxKeyboardHeight"
+    latin:minKeyboardHeight="@fraction/minKeyboardHeight"
     latin:rowHeight="25%p"
     latin:keyWidth="10%p"
     latin:horizontalGap="@dimen/key_horizontal_gap"
diff --git a/java/res/xml-fr-rCH/kbd_qwerty.xml b/java/res/xml-fr-rCH/kbd_qwerty.xml
index e47cfd9..f82becb 100644
--- a/java/res/xml-fr-rCH/kbd_qwerty.xml
+++ b/java/res/xml-fr-rCH/kbd_qwerty.xml
@@ -21,7 +21,8 @@
 <Keyboard
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
     latin:keyboardHeight="@dimen/keyboardHeight"
-    latin:maxKeyboardHeight="50%p"
+    latin:maxKeyboardHeight="@fraction/maxKeyboardHeight"
+    latin:minKeyboardHeight="@fraction/minKeyboardHeight"
     latin:rowHeight="25%p"
     latin:keyWidth="10%p"
     latin:horizontalGap="@dimen/key_horizontal_gap"
diff --git a/java/res/xml-fr/kbd_qwerty.xml b/java/res/xml-fr/kbd_qwerty.xml
index 2f8e67b..bda69e8 100644
--- a/java/res/xml-fr/kbd_qwerty.xml
+++ b/java/res/xml-fr/kbd_qwerty.xml
@@ -21,7 +21,8 @@
 <Keyboard
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
     latin:keyboardHeight="@dimen/keyboardHeight"
-    latin:maxKeyboardHeight="50%p"
+    latin:maxKeyboardHeight="@fraction/maxKeyboardHeight"
+    latin:minKeyboardHeight="@fraction/minKeyboardHeight"
     latin:rowHeight="25%p"
     latin:keyWidth="10%p"
     latin:horizontalGap="@dimen/key_horizontal_gap"
diff --git a/java/res/xml-hu/kbd_qwerty.xml b/java/res/xml-hu/kbd_qwerty.xml
index db729cf..952ad9a 100644
--- a/java/res/xml-hu/kbd_qwerty.xml
+++ b/java/res/xml-hu/kbd_qwerty.xml
@@ -21,7 +21,8 @@
 <Keyboard
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
     latin:keyboardHeight="@dimen/keyboardHeight"
-    latin:maxKeyboardHeight="50%p"
+    latin:maxKeyboardHeight="@fraction/maxKeyboardHeight"
+    latin:minKeyboardHeight="@fraction/minKeyboardHeight"
     latin:rowHeight="25%p"
     latin:keyWidth="10%p"
     latin:horizontalGap="@dimen/key_horizontal_gap"
diff --git a/java/res/xml-iw/kbd_qwerty.xml b/java/res/xml-iw/kbd_qwerty.xml
index 4cd565b..cfe404c 100644
--- a/java/res/xml-iw/kbd_qwerty.xml
+++ b/java/res/xml-iw/kbd_qwerty.xml
@@ -21,7 +21,8 @@
 <Keyboard
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
     latin:keyboardHeight="@dimen/keyboardHeight"
-    latin:maxKeyboardHeight="50%p"
+    latin:maxKeyboardHeight="@fraction/maxKeyboardHeight"
+    latin:minKeyboardHeight="@fraction/minKeyboardHeight"
     latin:rowHeight="25%p"
     latin:keyWidth="10%p"
     latin:horizontalGap="@dimen/key_horizontal_gap"
diff --git a/java/res/xml-nb/kbd_qwerty.xml b/java/res/xml-nb/kbd_qwerty.xml
index 7b20ca2..e7a743c 100644
--- a/java/res/xml-nb/kbd_qwerty.xml
+++ b/java/res/xml-nb/kbd_qwerty.xml
@@ -21,7 +21,8 @@
 <Keyboard
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
     latin:keyboardHeight="@dimen/keyboardHeight"
-    latin:maxKeyboardHeight="50%p"
+    latin:maxKeyboardHeight="@fraction/maxKeyboardHeight"
+    latin:minKeyboardHeight="@fraction/minKeyboardHeight"
     latin:rowHeight="25%p"
     latin:horizontalGap="@dimen/key_horizontal_gap"
     latin:verticalGap="@dimen/key_bottom_gap"
diff --git a/java/res/xml-ru/kbd_qwerty.xml b/java/res/xml-ru/kbd_qwerty.xml
index e5aea58..0f5fdcd 100644
--- a/java/res/xml-ru/kbd_qwerty.xml
+++ b/java/res/xml-ru/kbd_qwerty.xml
@@ -21,7 +21,8 @@
 <Keyboard
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
     latin:keyboardHeight="@dimen/keyboardHeight"
-    latin:maxKeyboardHeight="50%p"
+    latin:maxKeyboardHeight="@fraction/maxKeyboardHeight"
+    latin:minKeyboardHeight="@fraction/minKeyboardHeight"
     latin:rowHeight="25%p"
     latin:horizontalGap="@dimen/key_horizontal_gap"
     latin:verticalGap="@dimen/key_bottom_gap"
diff --git a/java/res/xml-sr/kbd_qwerty.xml b/java/res/xml-sr/kbd_qwerty.xml
index 9782cd5..6116c75 100644
--- a/java/res/xml-sr/kbd_qwerty.xml
+++ b/java/res/xml-sr/kbd_qwerty.xml
@@ -21,7 +21,8 @@
 <Keyboard
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
     latin:keyboardHeight="@dimen/keyboardHeight"
-    latin:maxKeyboardHeight="50%p"
+    latin:maxKeyboardHeight="@fraction/maxKeyboardHeight"
+    latin:minKeyboardHeight="@fraction/minKeyboardHeight"
     latin:rowHeight="25%p"
     latin:horizontalGap="@dimen/key_horizontal_gap"
     latin:verticalGap="@dimen/key_bottom_gap"
diff --git a/java/res/xml-sv/kbd_qwerty.xml b/java/res/xml-sv/kbd_qwerty.xml
index 3ff1679..69f0b3f 100644
--- a/java/res/xml-sv/kbd_qwerty.xml
+++ b/java/res/xml-sv/kbd_qwerty.xml
@@ -21,7 +21,8 @@
 <Keyboard
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
     latin:keyboardHeight="@dimen/keyboardHeight"
-    latin:maxKeyboardHeight="50%p"
+    latin:maxKeyboardHeight="@fraction/maxKeyboardHeight"
+    latin:minKeyboardHeight="@fraction/minKeyboardHeight"
     latin:rowHeight="25%p"
     latin:horizontalGap="@dimen/key_horizontal_gap"
     latin:verticalGap="@dimen/key_bottom_gap"
diff --git a/java/res/xml-xlarge/kbd_number.xml b/java/res/xml-xlarge/kbd_number.xml
index 012b751..7cb77ea 100644
--- a/java/res/xml-xlarge/kbd_number.xml
+++ b/java/res/xml-xlarge/kbd_number.xml
@@ -21,7 +21,8 @@
 <Keyboard
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
     latin:keyboardHeight="@dimen/keyboardHeight"
-    latin:maxKeyboardHeight="50%p"
+    latin:maxKeyboardHeight="@fraction/maxKeyboardHeight"
+    latin:minKeyboardHeight="@fraction/minKeyboardHeight"
     latin:rowHeight="25%p"
     latin:keyWidth="11.949%p"
     latin:horizontalGap="@dimen/key_horizontal_gap"
diff --git a/java/res/xml-xlarge/kbd_phone.xml b/java/res/xml-xlarge/kbd_phone.xml
index 9122176..60edcf2 100644
--- a/java/res/xml-xlarge/kbd_phone.xml
+++ b/java/res/xml-xlarge/kbd_phone.xml
@@ -21,7 +21,8 @@
 <Keyboard
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
     latin:keyboardHeight="@dimen/keyboardHeight"
-    latin:maxKeyboardHeight="50%p"
+    latin:maxKeyboardHeight="@fraction/maxKeyboardHeight"
+    latin:minKeyboardHeight="@fraction/minKeyboardHeight"
     latin:rowHeight="25%p"
     latin:keyWidth="11.949%p"
     latin:horizontalGap="@dimen/key_horizontal_gap"
diff --git a/java/res/xml-xlarge/kbd_phone_symbols.xml b/java/res/xml-xlarge/kbd_phone_symbols.xml
index 055c148..c388a46 100644
--- a/java/res/xml-xlarge/kbd_phone_symbols.xml
+++ b/java/res/xml-xlarge/kbd_phone_symbols.xml
@@ -21,7 +21,8 @@
 <Keyboard
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
     latin:keyboardHeight="@dimen/keyboardHeight"
-    latin:maxKeyboardHeight="50%p"
+    latin:maxKeyboardHeight="@fraction/maxKeyboardHeight"
+    latin:minKeyboardHeight="@fraction/minKeyboardHeight"
     latin:rowHeight="25%p"
     latin:keyWidth="11.949%p"
     latin:horizontalGap="@dimen/key_horizontal_gap"
diff --git a/java/res/xml-xlarge/kbd_symbols.xml b/java/res/xml-xlarge/kbd_symbols.xml
index f1deae0..3b9a6b2 100644
--- a/java/res/xml-xlarge/kbd_symbols.xml
+++ b/java/res/xml-xlarge/kbd_symbols.xml
@@ -21,7 +21,8 @@
 <Keyboard
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
     latin:keyboardHeight="@dimen/keyboardHeight"
-    latin:maxKeyboardHeight="50%p"
+    latin:maxKeyboardHeight="@fraction/maxKeyboardHeight"
+    latin:minKeyboardHeight="@fraction/minKeyboardHeight"
     latin:rowHeight="25%p"
     latin:horizontalGap="@dimen/key_horizontal_gap"
     latin:verticalGap="@dimen/key_bottom_gap"
diff --git a/java/res/xml-xlarge/kbd_symbols_shift.xml b/java/res/xml-xlarge/kbd_symbols_shift.xml
index cc23358..d7f5958 100644
--- a/java/res/xml-xlarge/kbd_symbols_shift.xml
+++ b/java/res/xml-xlarge/kbd_symbols_shift.xml
@@ -21,7 +21,8 @@
 <Keyboard
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
     latin:keyboardHeight="@dimen/keyboardHeight"
-    latin:maxKeyboardHeight="50%p"
+    latin:maxKeyboardHeight="@fraction/maxKeyboardHeight"
+    latin:minKeyboardHeight="@fraction/minKeyboardHeight"
     latin:rowHeight="25%p"
     latin:horizontalGap="@dimen/key_horizontal_gap"
     latin:verticalGap="@dimen/key_bottom_gap"
diff --git a/java/res/xml/kbd_number.xml b/java/res/xml/kbd_number.xml
index 7bd679b..2556f68 100644
--- a/java/res/xml/kbd_number.xml
+++ b/java/res/xml/kbd_number.xml
@@ -21,7 +21,8 @@
 <Keyboard
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
     latin:keyboardHeight="@dimen/keyboardHeight"
-    latin:maxKeyboardHeight="50%p"
+    latin:maxKeyboardHeight="@fraction/maxKeyboardHeight"
+    latin:minKeyboardHeight="@fraction/minKeyboardHeight"
     latin:rowHeight="25%p"
     latin:keyWidth="26.67%p"
     latin:horizontalGap="@dimen/key_horizontal_gap"
diff --git a/java/res/xml/kbd_phone.xml b/java/res/xml/kbd_phone.xml
index 62fbdee..ca591c7 100644
--- a/java/res/xml/kbd_phone.xml
+++ b/java/res/xml/kbd_phone.xml
@@ -21,7 +21,8 @@
 <Keyboard
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
     latin:keyboardHeight="@dimen/keyboardHeight"
-    latin:maxKeyboardHeight="50%p"
+    latin:maxKeyboardHeight="@fraction/maxKeyboardHeight"
+    latin:minKeyboardHeight="@fraction/minKeyboardHeight"
     latin:rowHeight="25%p"
     latin:keyWidth="26.67%p"
     latin:horizontalGap="@dimen/key_horizontal_gap"
diff --git a/java/res/xml/kbd_phone_symbols.xml b/java/res/xml/kbd_phone_symbols.xml
index 67cd330..99db23e 100644
--- a/java/res/xml/kbd_phone_symbols.xml
+++ b/java/res/xml/kbd_phone_symbols.xml
@@ -21,7 +21,8 @@
 <Keyboard
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
     latin:keyboardHeight="@dimen/keyboardHeight"
-    latin:maxKeyboardHeight="50%p"
+    latin:maxKeyboardHeight="@fraction/maxKeyboardHeight"
+    latin:minKeyboardHeight="@fraction/minKeyboardHeight"
     latin:rowHeight="25%p"
     latin:keyWidth="26.67%p"
     latin:horizontalGap="@dimen/key_horizontal_gap"
diff --git a/java/res/xml/kbd_qwerty.xml b/java/res/xml/kbd_qwerty.xml
index a4251c0..fd43740 100644
--- a/java/res/xml/kbd_qwerty.xml
+++ b/java/res/xml/kbd_qwerty.xml
@@ -21,7 +21,8 @@
 <Keyboard
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
     latin:keyboardHeight="@dimen/keyboardHeight"
-    latin:maxKeyboardHeight="50%p"
+    latin:maxKeyboardHeight="@fraction/maxKeyboardHeight"
+    latin:minKeyboardHeight="@fraction/minKeyboardHeight"
     latin:rowHeight="25%p"
     latin:keyWidth="10%p"
     latin:horizontalGap="@dimen/key_horizontal_gap"
diff --git a/java/res/xml/kbd_symbols.xml b/java/res/xml/kbd_symbols.xml
index 9748bce..a1bd8c0 100644
--- a/java/res/xml/kbd_symbols.xml
+++ b/java/res/xml/kbd_symbols.xml
@@ -21,7 +21,8 @@
 <Keyboard
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
     latin:keyboardHeight="@dimen/keyboardHeight"
-    latin:maxKeyboardHeight="50%p"
+    latin:maxKeyboardHeight="@fraction/maxKeyboardHeight"
+    latin:minKeyboardHeight="@fraction/minKeyboardHeight"
     latin:rowHeight="25%p"
     latin:keyWidth="10%p"
     latin:horizontalGap="@dimen/key_horizontal_gap"
diff --git a/java/res/xml/kbd_symbols_shift.xml b/java/res/xml/kbd_symbols_shift.xml
index 3978f17..cde0733 100644
--- a/java/res/xml/kbd_symbols_shift.xml
+++ b/java/res/xml/kbd_symbols_shift.xml
@@ -21,7 +21,8 @@
 <Keyboard
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
     latin:keyboardHeight="@dimen/keyboardHeight"
-    latin:maxKeyboardHeight="50%p"
+    latin:maxKeyboardHeight="@fraction/maxKeyboardHeight"
+    latin:minKeyboardHeight="@fraction/minKeyboardHeight"
     latin:rowHeight="25%p"
     latin:keyWidth="10%p"
     latin:horizontalGap="@dimen/key_horizontal_gap"