diff --git a/java/res/values-land/dimens.xml b/java/res/values-land/dimens.xml
index c46a517..a541287 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>
@@ -28,6 +29,9 @@
     <dimen name="keyboard_top_padding">0.0in</dimen>
     <dimen name="keyboard_bottom_padding">0.0in</dimen>
     <dimen name="keyboard_horizontal_edges_padding">0.0in</dimen>
+    <fraction name="key_letter_ratio">55%</fraction>
+    <fraction name="key_label_text_ratio">35%</fraction>
+    <fraction name="key_preview_text_ratio">90%</fraction>
     <dimen name="candidate_strip_height">38dip</dimen>
     <dimen name="candidate_strip_fading_edge_length">63dip</dimen>
     <dimen name="spacebar_vertical_correction">2dip</dimen>
diff --git a/java/res/values-xlarge-land/dimens.xml b/java/res/values-xlarge-land/dimens.xml
index fd6b1f3..ade1256 100644
--- a/java/res/values-xlarge-land/dimens.xml
+++ b/java/res/values-xlarge-land/dimens.xml
@@ -30,8 +30,8 @@
     <dimen name="keyboard_bottom_padding">0.0mm</dimen>
     <dimen name="keyboard_horizontal_edges_padding">0.0mm</dimen>
 
-    <dimen name="key_letter_size">28dip</dimen>
-    <dimen name="key_label_text_size">20dip</dimen>
+    <fraction name="key_letter_ratio">30.7%</fraction>
+    <fraction name="key_label_text_ratio">21.9%</fraction>
     <!-- left or right padding of label alignment -->
     <dimen name="key_label_horizontal_alignment_padding">18dip</dimen>
     <dimen name="key_preview_height_holo">26.5mm</dimen>
diff --git a/java/res/values-xlarge/dimens.xml b/java/res/values-xlarge/dimens.xml
index 4f78bea..2796b6f 100644
--- a/java/res/values-xlarge/dimens.xml
+++ b/java/res/values-xlarge/dimens.xml
@@ -37,11 +37,11 @@
     <!-- popup_key_height x -1.0 -->
     <dimen name="mini_keyboard_vertical_correction">-13.0mm</dimen>
 
-    <dimen name="key_letter_size">26dip</dimen>
-    <dimen name="key_label_text_size">16dip</dimen>
+    <fraction name="key_letter_ratio">34.4%</fraction>
+    <fraction name="key_label_text_ratio">21.2%</fraction>
     <!-- left or right padding of label alignment -->
     <dimen name="key_label_horizontal_alignment_padding">6dip</dimen>
-    <dimen name="key_preview_text_size_large">24dip</dimen>
+    <fraction name="key_preview_text_ratio">26.3%</fraction>
     <dimen name="key_preview_height_holo">23.0mm</dimen>
     <dimen name="key_preview_offset_holo">8.0mm</dimen>
 
diff --git a/java/res/values/attrs.xml b/java/res/values/attrs.xml
index e88b007..f03da4f 100644
--- a/java/res/values/attrs.xml
+++ b/java/res/values/attrs.xml
@@ -25,11 +25,13 @@
              checkable+checked+pressed. -->
         <attr name="keyBackground" format="reference" />
 
-        <!-- Size of the text for one letter character keys. -->
-        <attr name="keyLetterSize" format="dimension" />
+        <!-- Size of the text for one letter character keys, in the proportion of key height.
+             -->
+        <attr name="keyLetterRatio" format="float" />
 
-        <!-- Size of the text for custom keys with some text and no icon. -->
-        <attr name="labelTextSize" format="dimension" />
+        <!-- Size of the text for custom keys with some text and no icon, in the proportion of key
+             height. -->
+        <attr name="labelTextRatio" format="float" />
 
         <!-- Color to use for the label in a key. -->
         <attr name="keyTextColor" format="color" />
@@ -80,6 +82,9 @@
         <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..8f71954 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>
@@ -41,13 +43,13 @@
          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>
+    <fraction name="key_letter_ratio">45%</fraction>
+    <fraction name="key_label_text_ratio">29%</fraction>
     <!-- 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>
+    <fraction name="key_preview_text_ratio">82%</fraction>
     <dimen name="key_preview_height_holo">130sp</dimen>
     <dimen name="key_preview_offset_holo">0.193in</dimen>
 
diff --git a/java/res/values/styles.xml b/java/res/values/styles.xml
index 8a4b16d..3a389e5 100644
--- a/java/res/values/styles.xml
+++ b/java/res/values/styles.xml
@@ -19,14 +19,14 @@
         <item name="android:background">@drawable/keyboard_background</item>
 
         <item name="keyBackground">@drawable/btn_keyboard_key</item>
-        <item name="keyLetterSize">@dimen/key_letter_size</item>
+        <item name="keyLetterRatio">@fraction/key_letter_ratio</item>
         <item name="keyLetterStyle">normal</item>
         <item name="keyTextColor">#FFFFFFFF</item>
         <item name="keyTextColorDisabled">#FFFFFFFF</item>
         <item name="keyPreviewLayout">@layout/key_preview</item>
         <item name="keyPreviewOffset">@dimen/key_preview_offset</item>
         <item name="keyPreviewHeight">@dimen/key_preview_height</item>
-        <item name="labelTextSize">@dimen/key_label_text_size</item>
+        <item name="labelTextRatio">@fraction/key_label_text_ratio</item>
         <item name="popupLayout">@layout/keyboard_popup</item>
         <item name="keyHysteresisDistance">@dimen/key_hysteresis_distance</item>
         <item name="verticalCorrection">@dimen/keyboard_vertical_correction</item>
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 6b5c223..cc7722a 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 e4b73bf..5d1f10c 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 065cf3a..826818c 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 312eb13..41e8522 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 76508f4..0a80689 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"
diff --git a/java/src/com/android/inputmethod/keyboard/Key.java b/java/src/com/android/inputmethod/keyboard/Key.java
index 5c59d44..33b55b5 100644
--- a/java/src/com/android/inputmethod/keyboard/Key.java
+++ b/java/src/com/android/inputmethod/keyboard/Key.java
@@ -143,9 +143,9 @@
      * This constructor is being used only for key in mini popup keyboard.
      */
     public Key(Resources res, Keyboard keyboard, CharSequence popupCharacter, int x, int y,
-            int width, int edgeFlags) {
+            int width, int height, int edgeFlags) {
         mKeyboard = keyboard;
-        mHeight = keyboard.getRowHeight() - keyboard.getVerticalGap();
+        mHeight = height - keyboard.getVerticalGap();
         mGap = keyboard.getHorizontalGap();
         mVisualInsetsLeft = mVisualInsetsRight = 0;
         mWidth = width - mGap;
diff --git a/java/src/com/android/inputmethod/keyboard/KeyboardParser.java b/java/src/com/android/inputmethod/keyboard/KeyboardParser.java
index 69ae788..31fd0bf 100644
--- a/java/src/com/android/inputmethod/keyboard/KeyboardParser.java
+++ b/java/src/com/android/inputmethod/keyboard/KeyboardParser.java
@@ -196,9 +196,20 @@
             final int keyboardHeight = (int)keyboardAttr.getDimension(
                     R.styleable.Keyboard_keyboardHeight, displayHeight / 2);
             final int maxKeyboardHeight = getDimensionOrFraction(keyboardAttr,
-                    R.styleable.Keyboard_maxKeyboardHeight, displayHeight,  displayHeight / 2);
-            // Keyboard height will not exceed maxKeyboardHeight.
-            final int height = Math.min(keyboardHeight, maxKeyboardHeight);
+                    R.styleable.Keyboard_maxKeyboardHeight, displayHeight, displayHeight / 2);
+            int minKeyboardHeight = getDimensionOrFraction(keyboardAttr,
+                    R.styleable.Keyboard_minKeyboardHeight, displayHeight, displayHeight / 2);
+            if (minKeyboardHeight < 0) {
+                // Specified fraction was negative, so it should be calculated against display
+                // width.
+                final int displayWidth = keyboard.getDisplayWidth();
+                minKeyboardHeight = -getDimensionOrFraction(keyboardAttr,
+                        R.styleable.Keyboard_minKeyboardHeight, displayWidth, displayWidth / 2);
+            }
+            // Keyboard height will not exceed maxKeyboardHeight and will not be less than
+            // minKeyboardHeight.
+            final int height = Math.max(
+                    Math.min(keyboardHeight, maxKeyboardHeight), minKeyboardHeight);
             final int width = keyboard.getDisplayWidth();
 
             keyboard.setKeyboardHeight(height);
diff --git a/java/src/com/android/inputmethod/keyboard/KeyboardView.java b/java/src/com/android/inputmethod/keyboard/KeyboardView.java
index c551ed4..1ea1436 100644
--- a/java/src/com/android/inputmethod/keyboard/KeyboardView.java
+++ b/java/src/com/android/inputmethod/keyboard/KeyboardView.java
@@ -86,10 +86,12 @@
     private static final int HINT_ICON_VERTICAL_ADJUSTMENT_PIXEL = -1;
 
     // XML attribute
+    private float mKeyLetterRatio;
     private int mKeyLetterSize;
     private int mKeyTextColor;
     private int mKeyTextColorDisabled;
     private Typeface mKeyLetterStyle = Typeface.DEFAULT;
+    private float mLabelTextRatio;
     private int mLabelTextSize;
     private int mColorScheme = COLOR_SCHEME_WHITE;
     private int mShadowColor;
@@ -108,7 +110,8 @@
     // Key preview
     private boolean mInForeground;
     private TextView mPreviewText;
-    private int mPreviewTextSizeLarge;
+    private float mPreviewTextRatio;
+    private int mPreviewTextSize;
     private boolean mShowKeyPreview = true;
     private int mKeyPreviewDisplayedY;
     private final int mDelayBeforePreview;
@@ -327,8 +330,8 @@
             case R.styleable.KeyboardView_keyPreviewHeight:
                 mPreviewHeight = a.getDimensionPixelSize(attr, 80);
                 break;
-            case R.styleable.KeyboardView_keyLetterSize:
-                mKeyLetterSize = a.getDimensionPixelSize(attr, 18);
+            case R.styleable.KeyboardView_keyLetterRatio:
+                mKeyLetterRatio = getRatio(a, attr);
                 break;
             case R.styleable.KeyboardView_keyTextColor:
                 mKeyTextColor = a.getColor(attr, 0xFF000000);
@@ -336,8 +339,8 @@
             case R.styleable.KeyboardView_keyTextColorDisabled:
                 mKeyTextColorDisabled = a.getColor(attr, 0xFF000000);
                 break;
-            case R.styleable.KeyboardView_labelTextSize:
-                mLabelTextSize = a.getDimensionPixelSize(attr, 14);
+            case R.styleable.KeyboardView_labelTextRatio:
+                mLabelTextRatio = getRatio(a, attr);
                 break;
             case R.styleable.KeyboardView_popupLayout:
                 mPopupLayout = a.getResourceId(attr, 0);
@@ -365,7 +368,7 @@
 
         if (previewLayout != 0) {
             mPreviewText = (TextView) LayoutInflater.from(context).inflate(previewLayout, null);
-            mPreviewTextSizeLarge = (int) res.getDimension(R.dimen.key_preview_text_size_large);
+            mPreviewTextRatio = getRatio(res, R.fraction.key_preview_text_ratio);
         } else {
             mShowKeyPreview = false;
         }
@@ -460,6 +463,16 @@
         mKeyRepeatInterval = res.getInteger(R.integer.config_key_repeat_interval);
     }
 
+    // Read fraction value in TypedArray as float.
+    private static float getRatio(TypedArray a, int index) {
+        return a.getFraction(index, 1000, 1000, 1) / 1000.0f;
+    }
+
+    // Read fraction value in resource as float.
+    private static float getRatio(Resources res, int id) {
+        return res.getFraction(id, 1000, 1000) / 1000.0f;
+    }
+
     public void startIgnoringDoubleTap() {
         if (ENABLE_CAPSLOCK_BY_DOUBLETAP)
             mHandler.startIgnoringDoubleTap();
@@ -506,6 +519,10 @@
         invalidateAllKeys();
         mKeyDetector.setProximityThreshold(keyboard.getMostCommonKeyWidth());
         mPopupPanelCache.clear();
+        final int keyHeight = keyboard.getRowHeight() - keyboard.getVerticalGap();
+        mKeyLetterSize = (int)(keyHeight * mKeyLetterRatio);
+        mLabelTextSize = (int)(keyHeight * mLabelTextRatio);
+        mPreviewTextSize = (int)(keyHeight * mPreviewTextRatio);
     }
 
     /**
@@ -938,7 +955,7 @@
                 previewText.setTextSize(TypedValue.COMPLEX_UNIT_PX, mKeyLetterSize);
                 previewText.setTypeface(Typeface.DEFAULT_BOLD);
             } else {
-                previewText.setTextSize(TypedValue.COMPLEX_UNIT_PX, mPreviewTextSizeLarge);
+                previewText.setTextSize(TypedValue.COMPLEX_UNIT_PX, mPreviewTextSize);
                 previewText.setTypeface(mKeyLetterStyle);
             }
         } else {
@@ -1078,7 +1095,7 @@
         });
 
         final Keyboard keyboard = new MiniKeyboardBuilder(this, mKeyboard.getPopupKeyboardResId(),
-                parentKey).build();
+                parentKey, mKeyboard).build();
         miniKeyboardView.setKeyboard(keyboard);
 
         container.measure(MeasureSpec.makeMeasureSpec(getWidth(), MeasureSpec.AT_MOST),
diff --git a/java/src/com/android/inputmethod/keyboard/MiniKeyboardBuilder.java b/java/src/com/android/inputmethod/keyboard/MiniKeyboardBuilder.java
index e540fa1..2b83c3f 100644
--- a/java/src/com/android/inputmethod/keyboard/MiniKeyboardBuilder.java
+++ b/java/src/com/android/inputmethod/keyboard/MiniKeyboardBuilder.java
@@ -181,7 +181,8 @@
         }
     }
 
-    public MiniKeyboardBuilder(KeyboardView view, int layoutTemplateResId, Key parentKey) {
+    public MiniKeyboardBuilder(KeyboardView view, int layoutTemplateResId, Key parentKey,
+            Keyboard parentKeyboard) {
         final Context context = view.getContext();
         mRes = context.getResources();
         final MiniKeyboard keyboard = new MiniKeyboard(context, layoutTemplateResId, null);
@@ -191,12 +192,13 @@
         final int keyWidth = getMaxKeyWidth(view, mPopupCharacters, keyboard.getKeyWidth());
         final MiniKeyboardLayoutParams params = new MiniKeyboardLayoutParams(
                 mPopupCharacters.length, parentKey.mMaxPopupColumn,
-                keyWidth, keyboard.getRowHeight(),
+                keyWidth, parentKeyboard.getRowHeight(),
                 parentKey.mX + (parentKey.mWidth + parentKey.mGap) / 2 - keyWidth / 2,
                 view.getMeasuredWidth());
         mParams = params;
 
-        keyboard.setHeight(params.mNumRows * params.mRowHeight - keyboard.getVerticalGap());
+        keyboard.setRowHeight(params.mRowHeight);
+        keyboard.setHeight(params.mNumRows * params.mRowHeight);
         keyboard.setMinWidth(params.mNumColumns * params.mKeyWidth);
         keyboard.setDefaultCoordX(params.getDefaultKeyCoordX() + params.mKeyWidth / 2);
     }
@@ -235,7 +237,7 @@
             final CharSequence label = mPopupCharacters[n];
             final int row = n / params.mNumColumns;
             final Key key = new Key(mRes, keyboard, label, params.getX(n, row), params.getY(row),
-                    params.mKeyWidth, params.getRowFlags(row));
+                    params.mKeyWidth, params.mRowHeight, params.getRowFlags(row));
             keys.add(key);
         }
         return keyboard;