diff --git a/java/res/values/attrs.xml b/java/res/values/attrs.xml
index 51a0758..5b38987 100644
--- a/java/res/values/attrs.xml
+++ b/java/res/values/attrs.xml
@@ -173,13 +173,6 @@
         <attr name="themeId" format="integer" />
         <!-- Touch position correction -->
         <attr name="touchPositionCorrectionData" format="reference" />
-        <!-- Default keyboard height -->
-        <attr name="keyboardHeight" format="dimension|fraction" />
-        <!-- 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" />
         <!-- Keyboard top, bottom, both horizontal edges paddings. -->
         <attr name="keyboardTopPadding" format="dimension|fraction" />
         <attr name="keyboardBottomPadding" format="dimension|fraction" />
diff --git a/java/res/values/strings.xml b/java/res/values/strings.xml
index 1b518a1..e3cd84c 100644
--- a/java/res/values/strings.xml
+++ b/java/res/values/strings.xml
@@ -69,8 +69,10 @@
     <!-- Option summary for showing language switch key [CHAR LIMIT=65] -->
     <string name="show_language_switch_key_summary">Show when multiple input languages are enabled</string>
 
-    <!-- Option to enable sliding key input preview. The user can see a rubber band during sliding key input. [CHAR LIMIT=30]-->
-    <string name="sliding_key_input_preview">Sliding key input preview</string>
+    <!-- Option to enable sliding key input indicator. The user can see a rubber band-like effect during sliding key input. [CHAR LIMIT=30]-->
+    <string name="sliding_key_input_preview">Show slide indicator</string>
+    <!-- Option summary to enable sliding key input indicator. The user can see a rubber band-like effect during sliding key input. [CHAR LIMIT=65]-->
+    <string name="sliding_key_input_preview_summary">Display visual cue while sliding from Shift or Symbol keys</string>
 
     <!-- Option for the dismiss delay of the key popup [CHAR LIMIT=25] -->
     <string name="key_preview_popup_dismiss_delay">Key popup dismiss delay</string>
diff --git a/java/res/values/styles.xml b/java/res/values/styles.xml
index f07f2d3..19d6da8 100644
--- a/java/res/values/styles.xml
+++ b/java/res/values/styles.xml
@@ -21,9 +21,6 @@
         <item name="themeId">0</item>
         <item name="touchPositionCorrectionData">@array/touch_position_correction_data_default</item>
         <item name="rowHeight">25%p</item>
-        <item name="keyboardHeight">@dimen/keyboardHeight</item>
-        <item name="maxKeyboardHeight">@fraction/maxKeyboardHeight</item>
-        <item name="minKeyboardHeight">@fraction/minKeyboardHeight</item>
         <item name="moreKeysTemplate">@xml/kbd_more_keys_keyboard_template</item>
         <item name="keyboardTopPadding">@fraction/keyboard_top_padding</item>
         <item name="keyboardBottomPadding">@fraction/keyboard_bottom_padding</item>
diff --git a/java/res/xml/prefs.xml b/java/res/xml/prefs.xml
index da6e601..5ed0bb0 100644
--- a/java/res/xml/prefs.xml
+++ b/java/res/xml/prefs.xml
@@ -145,6 +145,7 @@
             <CheckBoxPreference
                 android:key="pref_sliding_key_input_preview"
                 android:title="@string/sliding_key_input_preview"
+                android:summary="@string/sliding_key_input_preview_summary"
                 android:persistent="true"
                 android:defaultValue="true" />
             <ListPreference
diff --git a/java/src/com/android/inputmethod/keyboard/KeyboardId.java b/java/src/com/android/inputmethod/keyboard/KeyboardId.java
index 4b43bcc..ee8ee9a 100644
--- a/java/src/com/android/inputmethod/keyboard/KeyboardId.java
+++ b/java/src/com/android/inputmethod/keyboard/KeyboardId.java
@@ -18,6 +18,7 @@
 
 import static com.android.inputmethod.latin.Constants.Subtype.ExtraValue.KEYBOARD_LAYOUT_SET;
 
+import android.content.res.Configuration;
 import android.text.InputType;
 import android.text.TextUtils;
 import android.view.inputmethod.EditorInfo;
@@ -62,8 +63,10 @@
     public final InputMethodSubtype mSubtype;
     public final Locale mLocale;
     public final int mDeviceFormFactor;
+    // TODO: Remove this member. It is used only for logging purpose.
     public final int mOrientation;
     public final int mWidth;
+    public final int mHeight;
     public final int mMode;
     public final int mElementId;
     private final EditorInfo mEditorInfo;
@@ -81,7 +84,8 @@
         mLocale = SubtypeLocale.getSubtypeLocale(mSubtype);
         mDeviceFormFactor = params.mDeviceFormFactor;
         mOrientation = params.mOrientation;
-        mWidth = params.mWidth;
+        mWidth = params.mKeyboardWidth;
+        mHeight = params.mKeyboardHeight;
         mMode = params.mMode;
         mElementId = elementId;
         mEditorInfo = params.mEditorInfo;
@@ -108,6 +112,7 @@
                 id.mElementId,
                 id.mMode,
                 id.mWidth,
+                id.mHeight,
                 id.passwordInput(),
                 id.mClobberSettingsKey,
                 id.mShortcutKeyEnabled,
@@ -130,6 +135,7 @@
                 && other.mElementId == mElementId
                 && other.mMode == mMode
                 && other.mWidth == mWidth
+                && other.mHeight == mHeight
                 && other.passwordInput() == passwordInput()
                 && other.mClobberSettingsKey == mClobberSettingsKey
                 && other.mShortcutKeyEnabled == mShortcutKeyEnabled
@@ -187,11 +193,13 @@
 
     @Override
     public String toString() {
-        return String.format("[%s %s:%s %s-%s:%d %s %s %s%s%s%s%s%s%s%s%s]",
+        final String orientation = (mOrientation == Configuration.ORIENTATION_PORTRAIT)
+                ? "port" : "land";
+        return String.format("[%s %s:%s %s-%s:%dx%d %s %s %s%s%s%s%s%s%s%s%s]",
                 elementIdToName(mElementId),
                 mLocale,
                 mSubtype.getExtraValueOf(KEYBOARD_LAYOUT_SET),
-                deviceFormFactor(mDeviceFormFactor), (mOrientation == 1 ? "port" : "land"), mWidth,
+                deviceFormFactor(mDeviceFormFactor), orientation, mWidth, mHeight,
                 modeName(mMode),
                 imeAction(),
                 (navigateNext() ? "navigateNext" : ""),
diff --git a/java/src/com/android/inputmethod/keyboard/KeyboardLayoutSet.java b/java/src/com/android/inputmethod/keyboard/KeyboardLayoutSet.java
index f060ad0..f28bc94 100644
--- a/java/src/com/android/inputmethod/keyboard/KeyboardLayoutSet.java
+++ b/java/src/com/android/inputmethod/keyboard/KeyboardLayoutSet.java
@@ -28,9 +28,11 @@
 import android.content.res.TypedArray;
 import android.content.res.XmlResourceParser;
 import android.text.InputType;
+import android.text.TextUtils;
 import android.util.Log;
 import android.util.SparseArray;
 import android.util.Xml;
+import android.view.ViewDebug.HierarchyTraceType;
 import android.view.inputmethod.EditorInfo;
 import android.view.inputmethod.InputMethodSubtype;
 
@@ -44,6 +46,7 @@
 import com.android.inputmethod.latin.InputTypeUtils;
 import com.android.inputmethod.latin.LatinImeLogger;
 import com.android.inputmethod.latin.R;
+import com.android.inputmethod.latin.ResourceUtils;
 import com.android.inputmethod.latin.SubtypeLocale;
 import com.android.inputmethod.latin.SubtypeSwitcher;
 import com.android.inputmethod.latin.XmlParseUtils;
@@ -106,7 +109,8 @@
         InputMethodSubtype mSubtype;
         int mDeviceFormFactor;
         int mOrientation;
-        int mWidth;
+        int mKeyboardWidth;
+        int mKeyboardHeight;
         // Sparse array of KeyboardLayoutSet element parameters indexed by element's id.
         final SparseArray<ElementParams> mKeyboardLayoutSetElementIdToParamsMap =
                 CollectionUtils.newSparseArray();
@@ -214,15 +218,43 @@
                     mPackageName, NO_SETTINGS_KEY, mEditorInfo);
         }
 
-        public Builder setScreenGeometry(final int deviceFormFactor, final int orientation,
-                final int widthPixels) {
+        public Builder setScreenGeometry(final int deviceFormFactor, final int widthPixels,
+                final int heightPixels) {
             final Params params = mParams;
             params.mDeviceFormFactor = deviceFormFactor;
-            params.mOrientation = orientation;
-            params.mWidth = widthPixels;
+            params.mOrientation = (heightPixels > widthPixels)
+                    ? Configuration.ORIENTATION_PORTRAIT : Configuration.ORIENTATION_LANDSCAPE;
+            setDefaultKeyboardSize(widthPixels, heightPixels);
             return this;
         }
 
+        private void setDefaultKeyboardSize(final int widthPixels, final int heightPixels) {
+            final String keyboardHeightString = ResourceUtils.getDeviceOverrideValue(
+                    mResources, R.array.keyboard_heights);
+            final float keyboardHeight;
+            if (TextUtils.isEmpty(keyboardHeightString)) {
+                keyboardHeight = mResources.getDimension(R.dimen.keyboardHeight);
+            } else {
+                keyboardHeight = Float.parseFloat(keyboardHeightString)
+                        * mResources.getDisplayMetrics().density;
+            }
+            final float maxKeyboardHeight = mResources.getFraction(
+                    R.fraction.maxKeyboardHeight, heightPixels, heightPixels);
+            float minKeyboardHeight = mResources.getFraction(
+                    R.fraction.minKeyboardHeight, heightPixels, heightPixels);
+            if (minKeyboardHeight < 0.0f) {
+                // Specified fraction was negative, so it should be calculated against display
+                // width.
+                minKeyboardHeight = -mResources.getFraction(
+                        R.fraction.minKeyboardHeight, widthPixels, widthPixels);
+            }
+            // Keyboard height will not exceed maxKeyboardHeight and will not be less than
+            // minKeyboardHeight.
+            mParams.mKeyboardHeight = (int)Math.max(
+                    Math.min(keyboardHeight, maxKeyboardHeight), minKeyboardHeight);
+            mParams.mKeyboardWidth = widthPixels;
+        }
+
         public Builder setSubtype(final InputMethodSubtype subtype) {
             final boolean asciiCapable = subtype.containsExtraValueKey(ASCII_CAPABLE);
             @SuppressWarnings("deprecation")
diff --git a/java/src/com/android/inputmethod/keyboard/KeyboardSwitcher.java b/java/src/com/android/inputmethod/keyboard/KeyboardSwitcher.java
index 30949ae..d15f14f 100644
--- a/java/src/com/android/inputmethod/keyboard/KeyboardSwitcher.java
+++ b/java/src/com/android/inputmethod/keyboard/KeyboardSwitcher.java
@@ -20,6 +20,7 @@
 import android.content.SharedPreferences;
 import android.content.res.Resources;
 import android.preference.PreferenceManager;
+import android.util.DisplayMetrics;
 import android.util.Log;
 import android.view.ContextThemeWrapper;
 import android.view.LayoutInflater;
@@ -140,8 +141,9 @@
         final KeyboardLayoutSet.Builder builder = new KeyboardLayoutSet.Builder(
                 mThemeContext, editorInfo);
         final Resources res = mThemeContext.getResources();
+        final DisplayMetrics dm = res.getDisplayMetrics();
         builder.setScreenGeometry(res.getInteger(R.integer.config_device_form_factor),
-                res.getConfiguration().orientation, res.getDisplayMetrics().widthPixels);
+                dm.widthPixels, dm.heightPixels);
         builder.setSubtype(mSubtypeSwitcher.getCurrentSubtype());
         builder.setOptions(
                 settingsValues.isVoiceKeyEnabled(editorInfo),
diff --git a/java/src/com/android/inputmethod/keyboard/internal/KeyboardBuilder.java b/java/src/com/android/inputmethod/keyboard/internal/KeyboardBuilder.java
index 04b8ecb..802d926 100644
--- a/java/src/com/android/inputmethod/keyboard/internal/KeyboardBuilder.java
+++ b/java/src/com/android/inputmethod/keyboard/internal/KeyboardBuilder.java
@@ -20,9 +20,7 @@
 import android.content.res.Resources;
 import android.content.res.TypedArray;
 import android.content.res.XmlResourceParser;
-import android.text.TextUtils;
 import android.util.AttributeSet;
-import android.util.DisplayMetrics;
 import android.util.Log;
 import android.util.TypedValue;
 import android.util.Xml;
@@ -138,7 +136,6 @@
     protected final KP mParams;
     protected final Context mContext;
     protected final Resources mResources;
-    private final DisplayMetrics mDisplayMetrics;
 
     private int mCurrentY = 0;
     private KeyboardRow mCurrentRow = null;
@@ -150,7 +147,6 @@
         mContext = context;
         final Resources res = context.getResources();
         mResources = res;
-        mDisplayMetrics = res.getDisplayMetrics();
 
         mParams = params;
 
@@ -232,39 +228,14 @@
     }
 
     private void parseKeyboardAttributes(final XmlPullParser parser) {
-        final int displayWidth = mDisplayMetrics.widthPixels;
         final TypedArray keyboardAttr = mContext.obtainStyledAttributes(
                 Xml.asAttributeSet(parser), R.styleable.Keyboard, R.attr.keyboardStyle,
                 R.style.Keyboard);
         final TypedArray keyAttr = mResources.obtainAttributes(Xml.asAttributeSet(parser),
                 R.styleable.Keyboard_Key);
         try {
-            final int displayHeight = mDisplayMetrics.heightPixels;
-            final String keyboardHeightString = ResourceUtils.getDeviceOverrideValue(
-                    mResources, R.array.keyboard_heights);
-            final float keyboardHeight;
-            if (TextUtils.isEmpty(keyboardHeightString)) {
-                keyboardHeight = keyboardAttr.getDimension(
-                        R.styleable.Keyboard_keyboardHeight, displayHeight / 2);
-            } else {
-                keyboardHeight = Float.parseFloat(keyboardHeightString)
-                        * mDisplayMetrics.density;
-            }
-            final float maxKeyboardHeight = ResourceUtils.getDimensionOrFraction(keyboardAttr,
-                    R.styleable.Keyboard_maxKeyboardHeight, displayHeight, displayHeight / 2);
-            float minKeyboardHeight = ResourceUtils.getDimensionOrFraction(keyboardAttr,
-                    R.styleable.Keyboard_minKeyboardHeight, displayHeight, displayHeight / 2);
-            if (minKeyboardHeight < 0) {
-                // Specified fraction was negative, so it should be calculated against display
-                // width.
-                minKeyboardHeight = -ResourceUtils.getDimensionOrFraction(keyboardAttr,
-                        R.styleable.Keyboard_minKeyboardHeight, displayWidth, displayWidth / 2);
-            }
             final KeyboardParams params = mParams;
-            // Keyboard height will not exceed maxKeyboardHeight and will not be less than
-            // minKeyboardHeight.
-            params.mOccupiedHeight = (int)Math.max(
-                    Math.min(keyboardHeight, maxKeyboardHeight), minKeyboardHeight);
+            params.mOccupiedHeight = params.mId.mHeight;
             params.mOccupiedWidth = params.mId.mWidth;
             params.mTopPadding = (int)ResourceUtils.getDimensionOrFraction(keyboardAttr,
                     R.styleable.Keyboard_keyboardTopPadding, params.mOccupiedHeight, 0);
diff --git a/native/jni/src/proximity_info_state.cpp b/native/jni/src/proximity_info_state.cpp
index 387b03a..141be26 100644
--- a/native/jni/src/proximity_info_state.cpp
+++ b/native/jni/src/proximity_info_state.cpp
@@ -27,8 +27,6 @@
 
 namespace latinime {
 
-const int ProximityInfoState::NOT_A_CODE = -1;
-
 void ProximityInfoState::initInputParams(const int pointerId, const float maxPointToKeyLength,
         const ProximityInfo *proximityInfo, const int *const inputCodes, const int inputSize,
         const int *const xCoordinates, const int *const yCoordinates, const int *const times,
diff --git a/native/jni/src/proximity_info_state.h b/native/jni/src/proximity_info_state.h
index 7422cb0..ff1b350 100644
--- a/native/jni/src/proximity_info_state.h
+++ b/native/jni/src/proximity_info_state.h
@@ -32,9 +32,6 @@
 
 class ProximityInfoState {
  public:
-
-    static const int NOT_A_CODE;
-
     /////////////////////////////////////////
     // Defined in proximity_info_state.cpp //
     /////////////////////////////////////////
@@ -196,6 +193,7 @@
             const int from, const int to, const int keyId, const bool extend) const;
 
     bool isKeyInSerchKeysAfterIndex(const int index, const int keyId) const;
+
  private:
     DISALLOW_COPY_AND_ASSIGN(ProximityInfoState);
     /////////////////////////////////////////
diff --git a/native/jni/src/suggest_utils.h b/native/jni/src/suggest_utils.h
index 7d49cde..aab9f7b 100644
--- a/native/jni/src/suggest_utils.h
+++ b/native/jni/src/suggest_utils.h
@@ -19,7 +19,6 @@
 
 #include "defines.h"
 #include "proximity_info_params.h"
-#include "proximity_info_state.h"
 
 namespace latinime {
 class SuggestUtils {
diff --git a/native/jni/src/words_priority_queue.h b/native/jni/src/words_priority_queue.h
index 7aab1e0..e0833ce 100644
--- a/native/jni/src/words_priority_queue.h
+++ b/native/jni/src/words_priority_queue.h
@@ -110,7 +110,7 @@
         }
     }
 
-    AK_FORCE_INLINE void dumpTopWord() {
+    AK_FORCE_INLINE void dumpTopWord() const {
         if (size() <= 0) {
             return;
         }
@@ -118,7 +118,7 @@
     }
 
     AK_FORCE_INLINE float getHighestNormalizedScore(const int *before, const int beforeLength,
-            int **outWord, int *outScore, int *outLength) {
+            int **outWord, int *outScore, int *outLength) const {
         if (!mHighestSuggestedWord) {
             return 0.0f;
         }
@@ -137,7 +137,7 @@
         }
     };
 
-    SuggestedWord *getFreeSuggestedWord(int score, int *word, int wordLength, int type) {
+    SuggestedWord *getFreeSuggestedWord(int score, int *word, int wordLength, int type) const {
         for (int i = 0; i < MAX_WORD_LENGTH; ++i) {
             if (!mSuggestedWords[i].mUsed) {
                 mSuggestedWords[i].setParams(score, word, wordLength, type);
diff --git a/native/jni/src/words_priority_queue_pool.h b/native/jni/src/words_priority_queue_pool.h
index cfe7ede..2cd210a 100644
--- a/native/jni/src/words_priority_queue_pool.h
+++ b/native/jni/src/words_priority_queue_pool.h
@@ -44,11 +44,11 @@
         }
     }
 
-    WordsPriorityQueue *getMasterQueue() {
+    WordsPriorityQueue *getMasterQueue() const {
         return mMasterQueue;
     }
 
-    WordsPriorityQueue *getSubQueue(const int wordIndex, const int inputWordLength) {
+    WordsPriorityQueue *getSubQueue(const int wordIndex, const int inputWordLength) const {
         if (wordIndex >= MULTIPLE_WORDS_SUGGESTION_MAX_WORDS) {
             return 0;
         }
@@ -77,7 +77,7 @@
         }
     }
 
-    void dumpSubQueue1TopSuggestions() {
+    void dumpSubQueue1TopSuggestions() const {
         AKLOGI("DUMP SUBQUEUE1 TOP SUGGESTIONS");
         for (int i = 0; i < SUB_QUEUE_MAX_COUNT; ++i) {
             getSubQueue(0, i)->dumpTopWord();