Refactor LatinKeyboard and LatinKey

This change also moves KeyboardSwitcher and related classes to
com.android.inputmethod.keyboard package.

Multi project change with Ib23017b2

Change-Id: Id7d54b24615fe22ebb540ca847549909e346ee24

1 files changed, 646 insertions, 0 deletions

diff --git a/java/src/com/android/inputmethod/keyboard/KeyboardSwitcher.java b/java/src/com/android/inputmethod/keyboard/KeyboardSwitcher.java
new file mode 100644
index 000000000..d3302fd6f
--- /dev/null
+++ b/java/src/com/android/inputmethod/keyboard/KeyboardSwitcher.java
@@ -0,0 +1,646 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+package com.android.inputmethod.keyboard;
+
+import com.android.inputmethod.latin.LatinIME;
+import com.android.inputmethod.latin.LatinIMESettings;
+import com.android.inputmethod.latin.LatinIMEUtil;
+import com.android.inputmethod.latin.LatinImeLogger;
+import com.android.inputmethod.latin.R;
+import com.android.inputmethod.latin.SubtypeSwitcher;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.content.res.Resources;
+import android.util.Log;
+import android.view.InflateException;
+import android.view.inputmethod.InputMethodManager;
+
+import java.lang.ref.SoftReference;
+import java.util.HashMap;
+import java.util.Locale;
+
+public class KeyboardSwitcher implements SharedPreferences.OnSharedPreferenceChangeListener {
+    private static final String TAG = "KeyboardSwitcher";
+    private static final boolean DEBUG = false;
+    public static final boolean DEBUG_STATE = false;
+
+    // Changing DEFAULT_LAYOUT_ID also requires prefs_for_debug.xml to be matched with.
+    public static final String DEFAULT_LAYOUT_ID = "5";
+    public static final String PREF_KEYBOARD_LAYOUT = "pref_keyboard_layout_20100902";
+    private static final int[] THEMES = new int [] {
+        R.layout.input_basic,
+        R.layout.input_basic_highcontrast,
+        R.layout.input_stone_normal,
+        R.layout.input_stone_bold,
+        R.layout.input_gingerbread,
+        R.layout.input_honeycomb, // DEFAULT_LAYOUT_ID
+    };
+
+    private static final int SYMBOLS_MODE_STATE_NONE = 0;
+    private static final int SYMBOLS_MODE_STATE_BEGIN = 1;
+    private static final int SYMBOLS_MODE_STATE_SYMBOL = 2;
+
+    private SubtypeSwitcher mSubtypeSwitcher;
+    private SharedPreferences mPrefs;
+
+    private LatinKeyboardView mInputView;
+    private LatinIME mInputMethodService;
+
+    private ShiftKeyState mShiftKeyState = new ShiftKeyState("Shift");
+    private ModifierKeyState mSymbolKeyState = new ModifierKeyState("Symbol");
+
+    private KeyboardId mSymbolsId;
+    private KeyboardId mSymbolsShiftedId;
+
+    private KeyboardId mCurrentId;
+    private final HashMap<KeyboardId, SoftReference<LatinKeyboard>> mKeyboardCache =
+            new HashMap<KeyboardId, SoftReference<LatinKeyboard>>();
+
+    private int mMode = KeyboardId.MODE_TEXT; /* default value */
+    private int mImeOptions;
+    private boolean mIsSymbols;
+    /** mIsAutoCompletionActive indicates that auto completed word will be input instead of
+     * what user actually typed. */
+    private boolean mIsAutoCompletionActive;
+    private boolean mVoiceKeyEnabled;
+    private boolean mVoiceButtonOnPrimary;
+    private int mSymbolsModeState = SYMBOLS_MODE_STATE_NONE;
+
+    // Indicates whether or not we have the settings key
+    private boolean mHasSettingsKey;
+    private static final int SETTINGS_KEY_MODE_AUTO = R.string.settings_key_mode_auto;
+    private static final int SETTINGS_KEY_MODE_ALWAYS_SHOW =
+            R.string.settings_key_mode_always_show;
+    // NOTE: No need to have SETTINGS_KEY_MODE_ALWAYS_HIDE here because it's not being referred to
+    // in the source code now.
+    // Default is SETTINGS_KEY_MODE_AUTO.
+    private static final int DEFAULT_SETTINGS_KEY_MODE = SETTINGS_KEY_MODE_AUTO;
+
+    private int mLayoutId;
+
+    private static final KeyboardSwitcher sInstance = new KeyboardSwitcher();
+
+    public static KeyboardSwitcher getInstance() {
+        return sInstance;
+    }
+
+    private KeyboardSwitcher() {
+    }
+
+    public static void init(LatinIME ims, SharedPreferences prefs) {
+        sInstance.mInputMethodService = ims;
+        sInstance.mPrefs = prefs;
+        sInstance.mSubtypeSwitcher = SubtypeSwitcher.getInstance();
+
+        sInstance.mLayoutId = Integer.valueOf(
+                prefs.getString(PREF_KEYBOARD_LAYOUT, DEFAULT_LAYOUT_ID));
+        prefs.registerOnSharedPreferenceChangeListener(sInstance);
+    }
+
+    private void makeSymbolsKeyboardIds() {
+        final Locale locale = mSubtypeSwitcher.getInputLocale();
+        final int orientation = mInputMethodService.getResources().getConfiguration().orientation;
+        final int mode = mMode;
+        final int colorScheme = getColorScheme();
+        final boolean hasSettingsKey = mHasSettingsKey;
+        final boolean voiceKeyEnabled = mVoiceKeyEnabled;
+        final boolean hasVoiceKey = voiceKeyEnabled && !mVoiceButtonOnPrimary;
+        final int imeOptions = mImeOptions;
+        // Note: This comment is only applied for phone number keyboard layout.
+        // On non-xlarge device, "@integer/key_switch_alpha_symbol" key code is used to switch
+        // between "phone keyboard" and "phone symbols keyboard".  But on xlarge device,
+        // "@integer/key_shift" key code is used for that purpose in order to properly display
+        // "more" and "locked more" key labels.  To achieve these behavior, we should initialize
+        // mSymbolsId and mSymbolsShiftedId to "phone keyboard" and "phone symbols keyboard"
+        // respectively here for xlarge device's layout switching.
+        mSymbolsId = new KeyboardId(locale, orientation, mode,
+                mode == KeyboardId.MODE_PHONE ? R.xml.kbd_phone : R.xml.kbd_symbols,
+                colorScheme, hasSettingsKey, voiceKeyEnabled, hasVoiceKey, imeOptions, true);
+        mSymbolsShiftedId = new KeyboardId(locale, orientation, mode,
+                mode == KeyboardId.MODE_PHONE ? R.xml.kbd_phone_symbols : R.xml.kbd_symbols_shift,
+                colorScheme, hasSettingsKey, voiceKeyEnabled, hasVoiceKey, imeOptions, true);
+    }
+
+    private boolean hasVoiceKey(boolean isSymbols) {
+        return mVoiceKeyEnabled && (isSymbols != mVoiceButtonOnPrimary);
+    }
+
+    public void loadKeyboard(int mode, int imeOptions, boolean voiceKeyEnabled,
+            boolean voiceButtonOnPrimary) {
+        mSymbolsModeState = SYMBOLS_MODE_STATE_NONE;
+        try {
+            loadKeyboardInternal(mode, imeOptions, voiceKeyEnabled, voiceButtonOnPrimary,
+                    false);
+        } catch (RuntimeException e) {
+            Log.w(TAG, e);
+            LatinImeLogger.logOnException(mode + "," + imeOptions, e);
+        }
+    }
+
+    private void loadKeyboardInternal(int mode, int imeOptions, boolean voiceButtonEnabled,
+            boolean voiceButtonOnPrimary, boolean isSymbols) {
+        if (mInputView == null) return;
+        mInputView.setPreviewEnabled(mInputMethodService.getPopupOn());
+
+        mMode = mode;
+        mImeOptions = imeOptions;
+        mVoiceKeyEnabled = voiceButtonEnabled;
+        mVoiceButtonOnPrimary = voiceButtonOnPrimary;
+        mIsSymbols = isSymbols;
+        // Update the settings key state because number of enabled IMEs could have been changed
+        mHasSettingsKey = getSettingsKeyMode(mPrefs, mInputMethodService);
+        makeSymbolsKeyboardIds();
+
+        KeyboardId id = getKeyboardId(mode, imeOptions, isSymbols);
+        LatinKeyboard keyboard = getKeyboard(id);
+
+        mCurrentId = id;
+        mInputView.setKeyboard(keyboard);
+    }
+
+    private LatinKeyboard getKeyboard(KeyboardId id) {
+        final SoftReference<LatinKeyboard> ref = mKeyboardCache.get(id);
+        LatinKeyboard keyboard = (ref == null) ? null : ref.get();
+        if (keyboard == null) {
+            final Locale savedLocale =  mSubtypeSwitcher.changeSystemLocale(
+                    mSubtypeSwitcher.getInputLocale());
+
+            keyboard = new LatinKeyboard(mInputMethodService, id);
+
+            if (id.mEnableShiftLock) {
+                keyboard.enableShiftLock();
+            }
+
+            mKeyboardCache.put(id, new SoftReference<LatinKeyboard>(keyboard));
+            if (DEBUG)
+                Log.d(TAG, "keyboard cache size=" + mKeyboardCache.size() + ": "
+                        + ((ref == null) ? "LOAD" : "GCed") + " id=" + id);
+
+            mSubtypeSwitcher.changeSystemLocale(savedLocale);
+        } else if (DEBUG) {
+            Log.d(TAG, "keyboard cache size=" + mKeyboardCache.size() + ": HIT  id=" + id);
+        }
+
+        keyboard.onAutoCompletionStateChanged(mIsAutoCompletionActive);
+        keyboard.setShifted(false);
+        return keyboard;
+    }
+
+    private KeyboardId getKeyboardId(int mode, int imeOptions, boolean isSymbols) {
+        final boolean hasVoiceKey = hasVoiceKey(isSymbols);
+        final int charColorId = getColorScheme();
+        final int xmlId;
+        final boolean enableShiftLock;
+
+        if (isSymbols) {
+            if (mode == KeyboardId.MODE_PHONE) {
+                xmlId = R.xml.kbd_phone_symbols;
+            } else if (mode == KeyboardId.MODE_NUMBER) {
+                // Note: MODE_NUMBER keyboard layout has no "switch alpha symbol" key.
+                xmlId = R.xml.kbd_number;
+            } else {
+                xmlId = R.xml.kbd_symbols;
+            }
+            enableShiftLock = false;
+        } else {
+            if (mode == KeyboardId.MODE_PHONE) {
+                xmlId = R.xml.kbd_phone;
+                enableShiftLock = false;
+            } else if (mode == KeyboardId.MODE_NUMBER) {
+                xmlId = R.xml.kbd_number;
+                enableShiftLock = false;
+            } else {
+                xmlId = R.xml.kbd_qwerty;
+                enableShiftLock = true;
+            }
+        }
+        final int orientation = mInputMethodService.getResources().getConfiguration().orientation;
+        final Locale locale = mSubtypeSwitcher.getInputLocale();
+        return new KeyboardId(locale, orientation, mode, xmlId, charColorId,
+                mHasSettingsKey, mVoiceKeyEnabled, hasVoiceKey, imeOptions, enableShiftLock);
+    }
+
+    public int getKeyboardMode() {
+        return mMode;
+    }
+
+    public boolean isAlphabetMode() {
+        return mCurrentId != null && mCurrentId.isAlphabetKeyboard();
+    }
+
+    public boolean isInputViewShown() {
+        return mInputView != null && mInputView.isShown();
+    }
+
+    public boolean isKeyboardAvailable() {
+        if (mInputView != null)
+            return mInputView.getLatinKeyboard() != null;
+        return false;
+    }
+
+    private LatinKeyboard getLatinKeyboard() {
+        if (mInputView != null)
+            return mInputView.getLatinKeyboard();
+        return null;
+    }
+
+    public void setPreferredLetters(int[] frequencies) {
+        LatinKeyboard latinKeyboard = getLatinKeyboard();
+        if (latinKeyboard != null)
+            latinKeyboard.setPreferredLetters(frequencies);
+    }
+
+    public void keyReleased() {
+        LatinKeyboard latinKeyboard = getLatinKeyboard();
+        if (latinKeyboard != null)
+            latinKeyboard.keyReleased();
+    }
+
+    public boolean isShiftedOrShiftLocked() {
+        LatinKeyboard latinKeyboard = getLatinKeyboard();
+        if (latinKeyboard != null)
+            return latinKeyboard.isShiftedOrShiftLocked();
+        return false;
+    }
+
+    public boolean isShiftLocked() {
+        LatinKeyboard latinKeyboard = getLatinKeyboard();
+        if (latinKeyboard != null)
+            return latinKeyboard.isShiftLocked();
+        return false;
+    }
+
+    public boolean isAutomaticTemporaryUpperCase() {
+        LatinKeyboard latinKeyboard = getLatinKeyboard();
+        if (latinKeyboard != null)
+            return latinKeyboard.isAutomaticTemporaryUpperCase();
+        return false;
+    }
+
+    public boolean isManualTemporaryUpperCase() {
+        LatinKeyboard latinKeyboard = getLatinKeyboard();
+        if (latinKeyboard != null)
+            return latinKeyboard.isManualTemporaryUpperCase();
+        return false;
+    }
+
+    private void setManualTemporaryUpperCase(boolean shifted) {
+        LatinKeyboard latinKeyboard = getLatinKeyboard();
+        if (latinKeyboard != null) {
+            // On non-distinct multi touch panel device, we should also turn off the shift locked
+            // state when shift key is pressed to go to normal mode.
+            // On the other hand, on distinct multi touch panel device, turning off the shift locked
+            // state with shift key pressing is handled by onReleaseShift().
+            if (!hasDistinctMultitouch() && !shifted && latinKeyboard.isShiftLocked()) {
+                latinKeyboard.setShiftLocked(false);
+            }
+            if (latinKeyboard.setShifted(shifted)) {
+                mInputView.invalidateAllKeys();
+            }
+        }
+    }
+
+    private void setShiftLocked(boolean shiftLocked) {
+        LatinKeyboard latinKeyboard = getLatinKeyboard();
+        if (latinKeyboard != null && latinKeyboard.setShiftLocked(shiftLocked)) {
+            mInputView.invalidateAllKeys();
+        }
+    }
+
+    /**
+     * Toggle keyboard shift state triggered by user touch event.
+     */
+    public void toggleShift() {
+        mInputMethodService.mHandler.cancelUpdateShiftState();
+        if (DEBUG_STATE)
+            Log.d(TAG, "toggleShift:"
+                    + " keyboard=" + getLatinKeyboard().getKeyboardShiftState()
+                    + " shiftKeyState=" + mShiftKeyState);
+        if (isAlphabetMode()) {
+            setManualTemporaryUpperCase(!isShiftedOrShiftLocked());
+        } else {
+            toggleShiftInSymbol();
+        }
+    }
+
+    public void toggleCapsLock() {
+        mInputMethodService.mHandler.cancelUpdateShiftState();
+        if (DEBUG_STATE)
+            Log.d(TAG, "toggleCapsLock:"
+                    + " keyboard=" + getLatinKeyboard().getKeyboardShiftState()
+                    + " shiftKeyState=" + mShiftKeyState);
+        if (isAlphabetMode()) {
+            if (isShiftLocked()) {
+                // Shift key is long pressed while caps lock state, we will toggle back to normal
+                // state. And mark as if shift key is released.
+                setShiftLocked(false);
+                mShiftKeyState.onRelease();
+            } else {
+                setShiftLocked(true);
+            }
+        }
+    }
+
+    private void setAutomaticTemporaryUpperCase() {
+        LatinKeyboard latinKeyboard = getLatinKeyboard();
+        if (latinKeyboard != null) {
+            latinKeyboard.setAutomaticTemporaryUpperCase();
+            mInputView.invalidateAllKeys();
+        }
+    }
+
+    /**
+     * Update keyboard shift state triggered by connected EditText status change.
+     */
+    public void updateShiftState() {
+        final ShiftKeyState shiftKeyState = mShiftKeyState;
+        if (DEBUG_STATE)
+            Log.d(TAG, "updateShiftState:"
+                    + " autoCaps=" + mInputMethodService.getCurrentAutoCapsState()
+                    + " keyboard=" + getLatinKeyboard().getKeyboardShiftState()
+                    + " shiftKeyState=" + shiftKeyState);
+        if (isAlphabetMode()) {
+            if (!isShiftLocked() && !shiftKeyState.isIgnoring()) {
+                if (shiftKeyState.isReleasing() && mInputMethodService.getCurrentAutoCapsState()) {
+                    // Only when shift key is releasing, automatic temporary upper case will be set.
+                    setAutomaticTemporaryUpperCase();
+                } else {
+                    setManualTemporaryUpperCase(shiftKeyState.isMomentary());
+                }
+            }
+        } else {
+            // In symbol keyboard mode, we should clear shift key state because only alphabet
+            // keyboard has shift key.
+            shiftKeyState.onRelease();
+        }
+    }
+
+    public void changeKeyboardMode() {
+        if (DEBUG_STATE)
+            Log.d(TAG, "changeKeyboardMode:"
+                    + " keyboard=" + getLatinKeyboard().getKeyboardShiftState()
+                    + " shiftKeyState=" + mShiftKeyState);
+        toggleKeyboardMode();
+        if (isShiftLocked() && isAlphabetMode())
+            setShiftLocked(true);
+        updateShiftState();
+    }
+
+    public void onPressShift() {
+        if (!isKeyboardAvailable())
+            return;
+        ShiftKeyState shiftKeyState = mShiftKeyState;
+        if (DEBUG_STATE)
+            Log.d(TAG, "onPressShift:"
+                    + " keyboard=" + getLatinKeyboard().getKeyboardShiftState()
+                    + " shiftKeyState=" + shiftKeyState);
+        if (isAlphabetMode()) {
+            if (isShiftLocked()) {
+                // Shift key is pressed while caps lock state, we will treat this state as shifted
+                // caps lock state and mark as if shift key pressed while normal state.
+                shiftKeyState.onPress();
+                setManualTemporaryUpperCase(true);
+            } else if (isAutomaticTemporaryUpperCase()) {
+                // Shift key is pressed while automatic temporary upper case, we have to move to
+                // manual temporary upper case.
+                shiftKeyState.onPress();
+                setManualTemporaryUpperCase(true);
+            } else if (isShiftedOrShiftLocked()) {
+                // In manual upper case state, we just record shift key has been pressing while
+                // shifted state.
+                shiftKeyState.onPressOnShifted();
+            } else {
+                // In base layout, chording or manual temporary upper case mode is started.
+                shiftKeyState.onPress();
+                toggleShift();
+            }
+        } else {
+            // In symbol mode, just toggle symbol and symbol more keyboard.
+            shiftKeyState.onPress();
+            toggleShift();
+        }
+    }
+
+    public void onReleaseShift() {
+        if (!isKeyboardAvailable())
+            return;
+        ShiftKeyState shiftKeyState = mShiftKeyState;
+        if (DEBUG_STATE)
+            Log.d(TAG, "onReleaseShift:"
+                    + " keyboard=" + getLatinKeyboard().getKeyboardShiftState()
+                    + " shiftKeyState=" + shiftKeyState);
+        if (isAlphabetMode()) {
+            if (shiftKeyState.isMomentary()) {
+                // After chording input while normal state.
+                toggleShift();
+            } else if (isShiftLocked() && !shiftKeyState.isIgnoring()) {
+                // Shift has been pressed without chording while caps lock state.
+                toggleCapsLock();
+            } else if (isShiftedOrShiftLocked() && shiftKeyState.isPressingOnShifted()) {
+                // Shift has been pressed without chording while shifted state.
+                toggleShift();
+            }
+        }
+        shiftKeyState.onRelease();
+    }
+
+    public void onPressSymbol() {
+        if (DEBUG_STATE)
+            Log.d(TAG, "onReleaseShift:"
+                    + " keyboard=" + getLatinKeyboard().getKeyboardShiftState()
+                    + " symbolKeyState=" + mSymbolKeyState);
+        changeKeyboardMode();
+        mSymbolKeyState.onPress();
+    }
+
+    public void onReleaseSymbol() {
+        if (DEBUG_STATE)
+            Log.d(TAG, "onReleaseShift:"
+                    + " keyboard=" + getLatinKeyboard().getKeyboardShiftState()
+                    + " symbolKeyState=" + mSymbolKeyState);
+        if (mSymbolKeyState.isMomentary())
+            changeKeyboardMode();
+        mSymbolKeyState.onRelease();
+    }
+
+    public void onOtherKeyPressed() {
+        if (DEBUG_STATE)
+            Log.d(TAG, "onOtherKeyPressed:"
+                    + " keyboard=" + getLatinKeyboard().getKeyboardShiftState()
+                    + " shiftKeyState=" + mShiftKeyState
+                    + " symbolKeyState=" + mSymbolKeyState);
+        mShiftKeyState.onOtherKeyPressed();
+        mSymbolKeyState.onOtherKeyPressed();
+    }
+
+    private void toggleShiftInSymbol() {
+        if (isAlphabetMode())
+            return;
+        final LatinKeyboard keyboard;
+        if (mCurrentId.equals(mSymbolsId) || !mCurrentId.equals(mSymbolsShiftedId)) {
+            mCurrentId = mSymbolsShiftedId;
+            keyboard = getKeyboard(mCurrentId);
+            // Symbol shifted keyboard has an ALT key that has a caps lock style indicator. To
+            // enable the indicator, we need to call enableShiftLock() and setShiftLocked(true).
+            // Thus we can keep the ALT key's Key.on value true while LatinKey.onRelease() is
+            // called.
+            keyboard.setShiftLocked(true);
+        } else {
+            mCurrentId = mSymbolsId;
+            keyboard = getKeyboard(mCurrentId);
+            // Symbol keyboard has an ALT key that has a caps lock style indicator. To disable the
+            // indicator, we need to call enableShiftLock() and setShiftLocked(false).
+            keyboard.setShifted(false);
+        }
+        mInputView.setKeyboard(keyboard);
+    }
+
+    private void toggleKeyboardMode() {
+        loadKeyboardInternal(mMode, mImeOptions, mVoiceKeyEnabled, mVoiceButtonOnPrimary,
+                !mIsSymbols);
+        if (mIsSymbols) {
+            mSymbolsModeState = SYMBOLS_MODE_STATE_BEGIN;
+        } else {
+            mSymbolsModeState = SYMBOLS_MODE_STATE_NONE;
+        }
+    }
+
+    public boolean hasDistinctMultitouch() {
+        return mInputView != null && mInputView.hasDistinctMultitouch();
+    }
+
+    /**
+     * Updates state machine to figure out when to automatically switch back to alpha mode.
+     */
+    public void onKey(int key) {
+        // Switch back to alpha mode if user types one or more non-space/enter
+        // characters followed by a space/enter
+        switch (mSymbolsModeState) {
+        case SYMBOLS_MODE_STATE_BEGIN:
+            if (key != Keyboard.CODE_SPACE && key != Keyboard.CODE_ENTER && key > 0) {
+                mSymbolsModeState = SYMBOLS_MODE_STATE_SYMBOL;
+            }
+            break;
+        case SYMBOLS_MODE_STATE_SYMBOL:
+            if (key == Keyboard.CODE_ENTER || key == Keyboard.CODE_SPACE) {
+                changeKeyboardMode();
+            }
+            break;
+        }
+    }
+
+    public LatinKeyboardView getInputView() {
+        return mInputView;
+    }
+
+    public LatinKeyboardView onCreateInputView() {
+        createInputViewInternal(mLayoutId, true);
+        return mInputView;
+    }
+
+    private void createInputViewInternal(int newLayout, boolean forceReset) {
+        if (mLayoutId != newLayout || mInputView == null || forceReset) {
+            if (mInputView != null) {
+                mInputView.closing();
+            }
+            if (THEMES.length <= newLayout) {
+                newLayout = Integer.valueOf(DEFAULT_LAYOUT_ID);
+            }
+
+            LatinIMEUtil.GCUtils.getInstance().reset();
+            boolean tryGC = true;
+            for (int i = 0; i < LatinIMEUtil.GCUtils.GC_TRY_LOOP_MAX && tryGC; ++i) {
+                try {
+                    mInputView = (LatinKeyboardView) mInputMethodService.getLayoutInflater(
+                            ).inflate(THEMES[newLayout], null);
+                    tryGC = false;
+                } catch (OutOfMemoryError e) {
+                    Log.w(TAG, "load keyboard failed: " + e);
+                    tryGC = LatinIMEUtil.GCUtils.getInstance().tryGCOrWait(
+                            mLayoutId + "," + newLayout, e);
+                } catch (InflateException e) {
+                    Log.w(TAG, "load keyboard failed: " + e);
+                    tryGC = LatinIMEUtil.GCUtils.getInstance().tryGCOrWait(
+                            mLayoutId + "," + newLayout, e);
+                }
+            }
+            mInputView.setOnKeyboardActionListener(mInputMethodService);
+            mLayoutId = newLayout;
+        }
+    }
+
+    private void postSetInputView() {
+        mInputMethodService.mHandler.post(new Runnable() {
+            @Override
+            public void run() {
+                if (mInputView != null) {
+                    mInputMethodService.setInputView(mInputView);
+                }
+                mInputMethodService.updateInputViewShown();
+            }
+        });
+    }
+
+    @Override
+    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
+        if (PREF_KEYBOARD_LAYOUT.equals(key)) {
+            final int layoutId = Integer.valueOf(
+                    sharedPreferences.getString(key, DEFAULT_LAYOUT_ID));
+            createInputViewInternal(layoutId, false);
+            postSetInputView();
+        } else if (LatinIMESettings.PREF_SETTINGS_KEY.equals(key)) {
+            mHasSettingsKey = getSettingsKeyMode(sharedPreferences, mInputMethodService);
+            createInputViewInternal(mLayoutId, true);
+            postSetInputView();
+        }
+    }
+
+    private int getColorScheme() {
+        return (mInputView != null)
+                ? mInputView.getColorScheme() : KeyboardView.COLOR_SCHEME_WHITE;
+    }
+
+    public void onAutoCompletionStateChanged(boolean isAutoCompletion) {
+        if (isAutoCompletion != mIsAutoCompletionActive) {
+            LatinKeyboardView keyboardView = getInputView();
+            mIsAutoCompletionActive = isAutoCompletion;
+            keyboardView.invalidateKey(((LatinKeyboard) keyboardView.getKeyboard())
+                    .onAutoCompletionStateChanged(isAutoCompletion));
+        }
+    }
+
+    private static boolean getSettingsKeyMode(SharedPreferences prefs, Context context) {
+        Resources resources = context.getResources();
+        final boolean showSettingsKeyOption = resources.getBoolean(
+                R.bool.config_enable_show_settings_key_option);
+        if (showSettingsKeyOption) {
+            final String settingsKeyMode = prefs.getString(LatinIMESettings.PREF_SETTINGS_KEY,
+                    resources.getString(DEFAULT_SETTINGS_KEY_MODE));
+            // We show the settings key when 1) SETTINGS_KEY_MODE_ALWAYS_SHOW or
+            // 2) SETTINGS_KEY_MODE_AUTO and there are two or more enabled IMEs on the system
+            if (settingsKeyMode.equals(resources.getString(SETTINGS_KEY_MODE_ALWAYS_SHOW))
+                    || (settingsKeyMode.equals(resources.getString(SETTINGS_KEY_MODE_AUTO))
+                            && LatinIMEUtil.hasMultipleEnabledIMEsOrSubtypes(
+                                    ((InputMethodManager) context.getSystemService(
+                                            Context.INPUT_METHOD_SERVICE))))) {
+                return true;
+            }
+        }
+        return false;
+    }
+}