LatinIME.java

/*
 * 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.latin;

import static com.android.inputmethod.latin.common.Constants.ImeOption.FORCE_ASCII;
import static com.android.inputmethod.latin.common.Constants.ImeOption.NO_MICROPHONE;
import static com.android.inputmethod.latin.common.Constants.ImeOption.NO_MICROPHONE_COMPAT;

import android.annotation.TargetApi;
import android.app.AlertDialog;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.inputmethodservice.InputMethodService;
import android.media.AudioManager;
import android.net.ConnectivityManager;
import android.os.Build;
import android.os.Debug;
import android.os.IBinder;
import android.os.Message;
import android.preference.PreferenceManager;
import android.text.InputType;
import android.text.TextUtils;
import android.util.Log;
import android.util.PrintWriterPrinter;
import android.util.Printer;
import android.util.SparseArray;
import android.view.Gravity;
import android.view.KeyEvent;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.view.ViewTreeObserver;
import android.view.Window;
import android.view.WindowManager;
import android.view.inputmethod.CompletionInfo;
import android.view.inputmethod.CursorAnchorInfo;
import android.view.inputmethod.EditorInfo;
import android.view.inputmethod.InputMethodSubtype;
import android.widget.TextView;

import com.android.inputmethod.accessibility.AccessibilityUtils;
import com.android.inputmethod.annotations.UsedForTesting;
import com.android.inputmethod.compat.CursorAnchorInfoCompatWrapper;
import com.android.inputmethod.compat.InputMethodServiceCompatUtils;
import com.android.inputmethod.compat.ViewOutlineProviderCompatUtils;
import com.android.inputmethod.compat.ViewOutlineProviderCompatUtils.InsetsUpdater;
import com.android.inputmethod.dictionarypack.DictionaryPackConstants;
import com.android.inputmethod.event.Event;
import com.android.inputmethod.event.HardwareEventDecoder;
import com.android.inputmethod.event.HardwareKeyboardEventDecoder;
import com.android.inputmethod.event.InputTransaction;
import com.android.inputmethod.keyboard.Keyboard;
import com.android.inputmethod.keyboard.KeyboardActionListener;
import com.android.inputmethod.keyboard.KeyboardId;
import com.android.inputmethod.keyboard.KeyboardSwitcher;
import com.android.inputmethod.keyboard.MainKeyboardView;
import com.android.inputmethod.keyboard.TextDecoratorUi;
import com.android.inputmethod.latin.Suggest.OnGetSuggestedWordsCallback;
import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
import com.android.inputmethod.latin.common.Constants;
import com.android.inputmethod.latin.common.CoordinateUtils;
import com.android.inputmethod.latin.common.InputPointers;
import com.android.inputmethod.latin.define.DebugFlags;
import com.android.inputmethod.latin.define.ProductionFlags;
import com.android.inputmethod.latin.inputlogic.InputLogic;
import com.android.inputmethod.latin.personalization.ContextualDictionaryUpdater;
import com.android.inputmethod.latin.personalization.DictionaryDecayBroadcastReciever;
import com.android.inputmethod.latin.personalization.PersonalizationDictionaryUpdater;
import com.android.inputmethod.latin.personalization.PersonalizationHelper;
import com.android.inputmethod.latin.settings.Settings;
import com.android.inputmethod.latin.settings.SettingsActivity;
import com.android.inputmethod.latin.settings.SettingsValues;
import com.android.inputmethod.latin.suggestions.SuggestionStripView;
import com.android.inputmethod.latin.suggestions.SuggestionStripViewAccessor;
import com.android.inputmethod.latin.touchinputconsumer.GestureConsumer;
import com.android.inputmethod.latin.utils.ApplicationUtils;
import com.android.inputmethod.latin.utils.CapsModeUtils;
import com.android.inputmethod.latin.utils.CursorAnchorInfoUtils;
import com.android.inputmethod.latin.utils.DialogUtils;
import com.android.inputmethod.latin.utils.ImportantNoticeUtils;
import com.android.inputmethod.latin.utils.IntentUtils;
import com.android.inputmethod.latin.utils.JniUtils;
import com.android.inputmethod.latin.utils.LeakGuardHandlerWrapper;
import com.android.inputmethod.latin.utils.StatsUtils;
import com.android.inputmethod.latin.utils.StatsUtilsManager;
import com.android.inputmethod.latin.utils.SubtypeLocaleUtils;
import com.android.inputmethod.latin.utils.ViewLayoutUtils;

import java.io.FileDescriptor;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Locale;
import java.util.concurrent.TimeUnit;

import javax.annotation.Nonnull;

/**
 * Input method implementation for Qwerty'ish keyboard.
 */
public class LatinIME extends InputMethodService implements KeyboardActionListener,
        SuggestionStripView.Listener, SuggestionStripViewAccessor,
        DictionaryFacilitator.DictionaryInitializationListener,
        ImportantNoticeDialog.ImportantNoticeDialogListener {
    static final String TAG = LatinIME.class.getSimpleName();
    private static final boolean TRACE = false;
    private static boolean DEBUG = false;

    private static final int EXTENDED_TOUCHABLE_REGION_HEIGHT = 100;
    private static final int PERIOD_FOR_AUDIO_AND_HAPTIC_FEEDBACK_IN_KEY_REPEAT = 2;
    private static final int PENDING_IMS_CALLBACK_DURATION_MILLIS = 800;
    static final long DELAY_WAIT_FOR_DICTIONARY_LOAD_MILLIS = TimeUnit.SECONDS.toMillis(2);
    static final long DELAY_DEALLOCATE_MEMORY_MILLIS = TimeUnit.SECONDS.toMillis(10);

    /**
     * The name of the scheme used by the Package Manager to warn of a new package installation,
     * replacement or removal.
     */
    private static final String SCHEME_PACKAGE = "package";

    final Settings mSettings;
    private final DictionaryFacilitator mDictionaryFacilitator =
            new DictionaryFacilitator(this /* context */);
    // TODO: Move from LatinIME.
    private final PersonalizationDictionaryUpdater mPersonalizationDictionaryUpdater =
            new PersonalizationDictionaryUpdater(this /* context */, mDictionaryFacilitator);
    private final ContextualDictionaryUpdater mContextualDictionaryUpdater =
            new ContextualDictionaryUpdater(this /* context */, mDictionaryFacilitator,
                    new Runnable() {
                        @Override
                        public void run() {
                            mHandler.postUpdateSuggestionStrip(SuggestedWords.INPUT_STYLE_NONE);
                        }
                    });
    final InputLogic mInputLogic = new InputLogic(this /* LatinIME */,
            this /* SuggestionStripViewAccessor */, mDictionaryFacilitator);
    // We expect to have only one decoder in almost all cases, hence the default capacity of 1.
    // If it turns out we need several, it will get grown seamlessly.
    final SparseArray<HardwareEventDecoder> mHardwareEventDecoders = new SparseArray<>(1);

    // TODO: Move these {@link View}s to {@link KeyboardSwitcher}.
    private View mInputView;
    private InsetsUpdater mInsetsUpdater;
    private SuggestionStripView mSuggestionStripView;
    private TextView mExtractEditText;

    private RichInputMethodManager mRichImm;
    @UsedForTesting final KeyboardSwitcher mKeyboardSwitcher;
    final SubtypeSwitcher mSubtypeSwitcher;
    private final SubtypeState mSubtypeState = new SubtypeState();
    private final EmojiAltPhysicalKeyDetector mEmojiAltPhysicalKeyDetector =
            new EmojiAltPhysicalKeyDetector();
    private StatsUtilsManager mStatsUtilsManager;
    // Working variable for {@link #startShowingInputView()} and
    // {@link #onEvaluateInputViewShown()}.
    private boolean mIsExecutingStartShowingInputView;

    // Object for reacting to adding/removing a dictionary pack.
    private final BroadcastReceiver mDictionaryPackInstallReceiver =
            new DictionaryPackInstallBroadcastReceiver(this);

    private final BroadcastReceiver mDictionaryDumpBroadcastReceiver =
            new DictionaryDumpBroadcastReceiver(this);

    private AlertDialog mOptionsDialog;

    private final boolean mIsHardwareAcceleratedDrawingEnabled;

    private GestureConsumer mGestureConsumer = GestureConsumer.NULL_GESTURE_CONSUMER;

    public final UIHandler mHandler = new UIHandler(this);

    public static final class UIHandler extends LeakGuardHandlerWrapper<LatinIME> {
        private static final int MSG_UPDATE_SHIFT_STATE = 0;
        private static final int MSG_PENDING_IMS_CALLBACK = 1;
        private static final int MSG_UPDATE_SUGGESTION_STRIP = 2;
        private static final int MSG_SHOW_GESTURE_PREVIEW_AND_SUGGESTION_STRIP = 3;
        private static final int MSG_RESUME_SUGGESTIONS = 4;
        private static final int MSG_REOPEN_DICTIONARIES = 5;
        private static final int MSG_UPDATE_TAIL_BATCH_INPUT_COMPLETED = 6;
        private static final int MSG_RESET_CACHES = 7;
        private static final int MSG_WAIT_FOR_DICTIONARY_LOAD = 8;
        private static final int MSG_DEALLOCATE_MEMORY = 9;
        private static final int MSG_RESUME_SUGGESTIONS_FOR_START_INPUT = 10;
        // Update this when adding new messages
        private static final int MSG_LAST = MSG_RESUME_SUGGESTIONS_FOR_START_INPUT;

        private static final int ARG1_NOT_GESTURE_INPUT = 0;
        private static final int ARG1_DISMISS_GESTURE_FLOATING_PREVIEW_TEXT = 1;
        private static final int ARG1_SHOW_GESTURE_FLOATING_PREVIEW_TEXT = 2;
        private static final int ARG2_UNUSED = 0;
        private static final int ARG1_TRUE = 1;

        private int mDelayInMillisecondsToUpdateSuggestions;
        private int mDelayInMillisecondsToUpdateShiftState;

        public UIHandler(@Nonnull final LatinIME ownerInstance) {
            super(ownerInstance);
        }

        public void onCreate() {
            final LatinIME latinIme = getOwnerInstance();
            if (latinIme == null) {
                return;
            }
            final Resources res = latinIme.getResources();
            mDelayInMillisecondsToUpdateSuggestions = res.getInteger(
                    R.integer.config_delay_in_milliseconds_to_update_suggestions);
            mDelayInMillisecondsToUpdateShiftState = res.getInteger(
                    R.integer.config_delay_in_milliseconds_to_update_shift_state);
        }

        @Override
        public void handleMessage(final Message msg) {
            final LatinIME latinIme = getOwnerInstance();
            if (latinIme == null) {
                return;
            }
            final KeyboardSwitcher switcher = latinIme.mKeyboardSwitcher;
            switch (msg.what) {
            case MSG_UPDATE_SUGGESTION_STRIP:
                cancelUpdateSuggestionStrip();
                latinIme.mInputLogic.performUpdateSuggestionStripSync(
                        latinIme.mSettings.getCurrent(), msg.arg1 /* inputStyle */);
                break;
            case MSG_UPDATE_SHIFT_STATE:
                switcher.requestUpdatingShiftState(latinIme.getCurrentAutoCapsState(),
                        latinIme.getCurrentRecapitalizeState());
                break;
            case MSG_SHOW_GESTURE_PREVIEW_AND_SUGGESTION_STRIP:
                if (msg.arg1 == ARG1_NOT_GESTURE_INPUT) {
                    final SuggestedWords suggestedWords = (SuggestedWords) msg.obj;
                    latinIme.showSuggestionStrip(suggestedWords);
                } else {
                    latinIme.showGesturePreviewAndSuggestionStrip((SuggestedWords) msg.obj,
                            msg.arg1 == ARG1_DISMISS_GESTURE_FLOATING_PREVIEW_TEXT);
                }
                break;
            case MSG_RESUME_SUGGESTIONS:
                latinIme.mInputLogic.restartSuggestionsOnWordTouchedByCursor(
                        latinIme.mSettings.getCurrent(), false /* forStartInput */,
                        latinIme.mKeyboardSwitcher.getCurrentKeyboardScriptId());
                break;
            case MSG_RESUME_SUGGESTIONS_FOR_START_INPUT:
                latinIme.mInputLogic.restartSuggestionsOnWordTouchedByCursor(
                        latinIme.mSettings.getCurrent(), true /* forStartInput */,
                        latinIme.mKeyboardSwitcher.getCurrentKeyboardScriptId());
                break;
            case MSG_REOPEN_DICTIONARIES:
                // We need to re-evaluate the currently composing word in case the script has
                // changed.
                postWaitForDictionaryLoad();
                latinIme.resetDictionaryFacilitatorIfNecessary();
                break;
            case MSG_UPDATE_TAIL_BATCH_INPUT_COMPLETED:
                final SuggestedWords suggestedWords = (SuggestedWords) msg.obj;
                latinIme.mInputLogic.onUpdateTailBatchInputCompleted(
                        latinIme.mSettings.getCurrent(),
                        suggestedWords, latinIme.mKeyboardSwitcher);
                latinIme.onTailBatchInputResultShown(suggestedWords);
                break;
            case MSG_RESET_CACHES:
                final SettingsValues settingsValues = latinIme.mSettings.getCurrent();
                if (latinIme.mInputLogic.retryResetCachesAndReturnSuccess(
                        msg.arg1 == ARG1_TRUE /* tryResumeSuggestions */,
                        msg.arg2 /* remainingTries */, this /* handler */)) {
                    // If we were able to reset the caches, then we can reload the keyboard.
                    // Otherwise, we'll do it when we can.
                    latinIme.mKeyboardSwitcher.loadKeyboard(latinIme.getCurrentInputEditorInfo(),
                            settingsValues, latinIme.getCurrentAutoCapsState(),
                            latinIme.getCurrentRecapitalizeState());
                }
                break;
            case MSG_WAIT_FOR_DICTIONARY_LOAD:
                Log.i(TAG, "Timeout waiting for dictionary load");
                break;
            case MSG_DEALLOCATE_MEMORY:
                latinIme.deallocateMemory();
                break;
            }
        }

        public void postUpdateSuggestionStrip(final int inputStyle) {
            sendMessageDelayed(obtainMessage(MSG_UPDATE_SUGGESTION_STRIP, inputStyle,
                    0 /* ignored */), mDelayInMillisecondsToUpdateSuggestions);
        }

        public void postReopenDictionaries() {
            sendMessage(obtainMessage(MSG_REOPEN_DICTIONARIES));
        }

        private void postResumeSuggestionsInternal(final boolean shouldDelay,
                final boolean forStartInput) {
            final LatinIME latinIme = getOwnerInstance();
            if (latinIme == null) {
                return;
            }
            if (!latinIme.mSettings.getCurrent().isSuggestionsEnabledPerUserSettings()) {
                return;
            }
            removeMessages(MSG_RESUME_SUGGESTIONS);
            removeMessages(MSG_RESUME_SUGGESTIONS_FOR_START_INPUT);
            final int message = forStartInput ? MSG_RESUME_SUGGESTIONS_FOR_START_INPUT
                    : MSG_RESUME_SUGGESTIONS;
            if (shouldDelay) {
                sendMessageDelayed(obtainMessage(message),
                        mDelayInMillisecondsToUpdateSuggestions);
            } else {
                sendMessage(obtainMessage(message));
            }
        }

        public void postResumeSuggestions(final boolean shouldDelay) {
            postResumeSuggestionsInternal(shouldDelay, false /* forStartInput */);
        }

        public void postResumeSuggestionsForStartInput(final boolean shouldDelay) {
            postResumeSuggestionsInternal(shouldDelay, true /* forStartInput */);
        }

        public void postResetCaches(final boolean tryResumeSuggestions, final int remainingTries) {
            removeMessages(MSG_RESET_CACHES);
            sendMessage(obtainMessage(MSG_RESET_CACHES, tryResumeSuggestions ? 1 : 0,
                    remainingTries, null));
        }

        public void postWaitForDictionaryLoad() {
            sendMessageDelayed(obtainMessage(MSG_WAIT_FOR_DICTIONARY_LOAD),
                    DELAY_WAIT_FOR_DICTIONARY_LOAD_MILLIS);
        }

        public void cancelWaitForDictionaryLoad() {
            removeMessages(MSG_WAIT_FOR_DICTIONARY_LOAD);
        }

        public boolean hasPendingWaitForDictionaryLoad() {
            return hasMessages(MSG_WAIT_FOR_DICTIONARY_LOAD);
        }

        public void cancelUpdateSuggestionStrip() {
            removeMessages(MSG_UPDATE_SUGGESTION_STRIP);
        }

        public boolean hasPendingUpdateSuggestions() {
            return hasMessages(MSG_UPDATE_SUGGESTION_STRIP);
        }

        public boolean hasPendingReopenDictionaries() {
            return hasMessages(MSG_REOPEN_DICTIONARIES);
        }

        public void postUpdateShiftState() {
            removeMessages(MSG_UPDATE_SHIFT_STATE);
            sendMessageDelayed(obtainMessage(MSG_UPDATE_SHIFT_STATE),
                    mDelayInMillisecondsToUpdateShiftState);
        }

        public void postDeallocateMemory() {
            sendMessageDelayed(obtainMessage(MSG_DEALLOCATE_MEMORY),
                    DELAY_DEALLOCATE_MEMORY_MILLIS);
        }

        public void cancelDeallocateMemory() {
            removeMessages(MSG_DEALLOCATE_MEMORY);
        }

        public boolean hasPendingDeallocateMemory() {
            return hasMessages(MSG_DEALLOCATE_MEMORY);
        }

        @UsedForTesting
        public void removeAllMessages() {
            for (int i = 0; i <= MSG_LAST; ++i) {
                removeMessages(i);
            }
        }

        public void showGesturePreviewAndSuggestionStrip(final SuggestedWords suggestedWords,
                final boolean dismissGestureFloatingPreviewText) {
            removeMessages(MSG_SHOW_GESTURE_PREVIEW_AND_SUGGESTION_STRIP);
            final int arg1 = dismissGestureFloatingPreviewText
                    ? ARG1_DISMISS_GESTURE_FLOATING_PREVIEW_TEXT
                    : ARG1_SHOW_GESTURE_FLOATING_PREVIEW_TEXT;
            obtainMessage(MSG_SHOW_GESTURE_PREVIEW_AND_SUGGESTION_STRIP, arg1,
                    ARG2_UNUSED, suggestedWords).sendToTarget();
        }

        public void showSuggestionStrip(final SuggestedWords suggestedWords) {
            removeMessages(MSG_SHOW_GESTURE_PREVIEW_AND_SUGGESTION_STRIP);
            obtainMessage(MSG_SHOW_GESTURE_PREVIEW_AND_SUGGESTION_STRIP,
                    ARG1_NOT_GESTURE_INPUT, ARG2_UNUSED, suggestedWords).sendToTarget();
        }

        public void showTailBatchInputResult(final SuggestedWords suggestedWords) {
            obtainMessage(MSG_UPDATE_TAIL_BATCH_INPUT_COMPLETED, suggestedWords).sendToTarget();
        }

        // Working variables for the following methods.
        private boolean mIsOrientationChanging;
        private boolean mPendingSuccessiveImsCallback;
        private boolean mHasPendingStartInput;
        private boolean mHasPendingFinishInputView;
        private boolean mHasPendingFinishInput;
        private EditorInfo mAppliedEditorInfo;

        public void startOrientationChanging() {
            removeMessages(MSG_PENDING_IMS_CALLBACK);
            resetPendingImsCallback();
            mIsOrientationChanging = true;
            final LatinIME latinIme = getOwnerInstance();
            if (latinIme == null) {
                return;
            }
            if (latinIme.isInputViewShown()) {
                latinIme.mKeyboardSwitcher.saveKeyboardState();
            }
        }

        private void resetPendingImsCallback() {
            mHasPendingFinishInputView = false;
            mHasPendingFinishInput = false;
            mHasPendingStartInput = false;
        }

        private void executePendingImsCallback(final LatinIME latinIme, final EditorInfo editorInfo,
                boolean restarting) {
            if (mHasPendingFinishInputView) {
                latinIme.onFinishInputViewInternal(mHasPendingFinishInput);
            }
            if (mHasPendingFinishInput) {
                latinIme.onFinishInputInternal();
            }
            if (mHasPendingStartInput) {
                latinIme.onStartInputInternal(editorInfo, restarting);
            }
            resetPendingImsCallback();
        }

        public void onStartInput(final EditorInfo editorInfo, final boolean restarting) {
            if (hasMessages(MSG_PENDING_IMS_CALLBACK)) {
                // Typically this is the second onStartInput after orientation changed.
                mHasPendingStartInput = true;
            } else {
                if (mIsOrientationChanging && restarting) {
                    // This is the first onStartInput after orientation changed.
                    mIsOrientationChanging = false;
                    mPendingSuccessiveImsCallback = true;
                }
                final LatinIME latinIme = getOwnerInstance();
                if (latinIme != null) {
                    executePendingImsCallback(latinIme, editorInfo, restarting);
                    latinIme.onStartInputInternal(editorInfo, restarting);
                }
            }
        }

        public void onStartInputView(final EditorInfo editorInfo, final boolean restarting) {
            if (hasMessages(MSG_PENDING_IMS_CALLBACK)
                    && KeyboardId.equivalentEditorInfoForKeyboard(editorInfo, mAppliedEditorInfo)) {
                // Typically this is the second onStartInputView after orientation changed.
                resetPendingImsCallback();
            } else {
                if (mPendingSuccessiveImsCallback) {
                    // This is the first onStartInputView after orientation changed.
                    mPendingSuccessiveImsCallback = false;
                    resetPendingImsCallback();
                    sendMessageDelayed(obtainMessage(MSG_PENDING_IMS_CALLBACK),
                            PENDING_IMS_CALLBACK_DURATION_MILLIS);
                }
                final LatinIME latinIme = getOwnerInstance();
                if (latinIme != null) {
                    executePendingImsCallback(latinIme, editorInfo, restarting);
                    latinIme.onStartInputViewInternal(editorInfo, restarting);
                    mAppliedEditorInfo = editorInfo;
                }
                cancelDeallocateMemory();
            }
        }

        public void onFinishInputView(final boolean finishingInput) {
            if (hasMessages(MSG_PENDING_IMS_CALLBACK)) {
                // Typically this is the first onFinishInputView after orientation changed.
                mHasPendingFinishInputView = true;
            } else {
                final LatinIME latinIme = getOwnerInstance();
                if (latinIme != null) {
                    latinIme.onFinishInputViewInternal(finishingInput);
                    mAppliedEditorInfo = null;
                }
                if (!hasPendingDeallocateMemory()) {
                    postDeallocateMemory();
                }
            }
        }

        public void onFinishInput() {
            if (hasMessages(MSG_PENDING_IMS_CALLBACK)) {
                // Typically this is the first onFinishInput after orientation changed.
                mHasPendingFinishInput = true;
            } else {
                final LatinIME latinIme = getOwnerInstance();
                if (latinIme != null) {
                    executePendingImsCallback(latinIme, null, false);
                    latinIme.onFinishInputInternal();
                }
            }
        }
    }

    static final class SubtypeState {
        private InputMethodSubtype mLastActiveSubtype;
        private boolean mCurrentSubtypeHasBeenUsed;

        public void setCurrentSubtypeHasBeenUsed() {
            mCurrentSubtypeHasBeenUsed = true;
        }

        public void switchSubtype(final IBinder token, final RichInputMethodManager richImm) {
            final InputMethodSubtype currentSubtype = richImm.getInputMethodManager()
                    .getCurrentInputMethodSubtype();
            final InputMethodSubtype lastActiveSubtype = mLastActiveSubtype;
            final boolean currentSubtypeHasBeenUsed = mCurrentSubtypeHasBeenUsed;
            if (currentSubtypeHasBeenUsed) {
                mLastActiveSubtype = currentSubtype;
                mCurrentSubtypeHasBeenUsed = false;
            }
            if (currentSubtypeHasBeenUsed
                    && richImm.checkIfSubtypeBelongsToThisImeAndEnabled(lastActiveSubtype)
                    && !currentSubtype.equals(lastActiveSubtype)) {
                richImm.setInputMethodAndSubtype(token, lastActiveSubtype);
                return;
            }
            richImm.switchToNextInputMethod(token, true /* onlyCurrentIme */);
        }
    }

    // Loading the native library eagerly to avoid unexpected UnsatisfiedLinkError at the initial
    // JNI call as much as possible.
    static {
        JniUtils.loadNativeLibrary();
    }

    public LatinIME() {
        super();
        mSettings = Settings.getInstance();
        mSubtypeSwitcher = SubtypeSwitcher.getInstance();
        mKeyboardSwitcher = KeyboardSwitcher.getInstance();
        mStatsUtilsManager = StatsUtilsManager.getInstance();
        mIsHardwareAcceleratedDrawingEnabled =
                InputMethodServiceCompatUtils.enableHardwareAcceleration(this);
        Log.i(TAG, "Hardware accelerated drawing: " + mIsHardwareAcceleratedDrawingEnabled);
    }

    @Override
    public void onCreate() {
        Settings.init(this);
        DebugFlags.init(PreferenceManager.getDefaultSharedPreferences(this));
        RichInputMethodManager.init(this);
        mRichImm = RichInputMethodManager.getInstance();
        SubtypeSwitcher.init(this);
        KeyboardSwitcher.init(this);
        AudioAndHapticFeedbackManager.init(this);
        AccessibilityUtils.init(this);
        mStatsUtilsManager.onCreate(this /* context */);
        super.onCreate();

        mHandler.onCreate();
        DEBUG = DebugFlags.DEBUG_ENABLED;

        // TODO: Resolve mutual dependencies of {@link #loadSettings()} and
        // {@link #resetDictionaryFacilitatorIfNecessary()}.
        loadSettings();
        mSubtypeSwitcher.onSubtypeChanged(mRichImm.getCurrentRawSubtype());
        resetDictionaryFacilitatorIfNecessary();

        // Register to receive ringer mode change and network state change.
        // Also receive installation and removal of a dictionary pack.
        final IntentFilter filter = new IntentFilter();
        filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
        filter.addAction(AudioManager.RINGER_MODE_CHANGED_ACTION);
        registerReceiver(mConnectivityAndRingerModeChangeReceiver, filter);

        final IntentFilter packageFilter = new IntentFilter();
        packageFilter.addAction(Intent.ACTION_PACKAGE_ADDED);
        packageFilter.addAction(Intent.ACTION_PACKAGE_REMOVED);
        packageFilter.addDataScheme(SCHEME_PACKAGE);
        registerReceiver(mDictionaryPackInstallReceiver, packageFilter);

        final IntentFilter newDictFilter = new IntentFilter();
        newDictFilter.addAction(DictionaryPackConstants.NEW_DICTIONARY_INTENT_ACTION);
        registerReceiver(mDictionaryPackInstallReceiver, newDictFilter);

        final IntentFilter dictDumpFilter = new IntentFilter();
        dictDumpFilter.addAction(DictionaryDumpBroadcastReceiver.DICTIONARY_DUMP_INTENT_ACTION);
        registerReceiver(mDictionaryDumpBroadcastReceiver, dictDumpFilter);

        DictionaryDecayBroadcastReciever.setUpIntervalAlarmForDictionaryDecaying(this);
        StatsUtils.onCreate(mSettings.getCurrent(), mRichImm);
    }

    // Has to be package-visible for unit tests
    @UsedForTesting
    void loadSettings() {
        final Locale[] locales = mRichImm.getCurrentSubtypeLocales();
        final EditorInfo editorInfo = getCurrentInputEditorInfo();
        final InputAttributes inputAttributes = new InputAttributes(
                editorInfo, isFullscreenMode(), getPackageName());
        // TODO: pass the array instead
        mSettings.loadSettings(this, locales[0], inputAttributes);
        final SettingsValues currentSettingsValues = mSettings.getCurrent();
        AudioAndHapticFeedbackManager.getInstance().onSettingsChanged(currentSettingsValues);
        // This method is called on startup and language switch, before the new layout has
        // been displayed. Opening dictionaries never affects responsivity as dictionaries are
        // asynchronously loaded.
        if (!mHandler.hasPendingReopenDictionaries()) {
            resetDictionaryFacilitatorForLocale(locales);
        }
        mDictionaryFacilitator.updateEnabledSubtypes(mRichImm.getMyEnabledInputMethodSubtypeList(
                true /* allowsImplicitlySelectedSubtypes */));
        refreshPersonalizationDictionarySession(currentSettingsValues);
        mStatsUtilsManager.onLoadSettings(currentSettingsValues);
    }

    private void refreshPersonalizationDictionarySession(
            final SettingsValues currentSettingsValues) {
        mDictionaryFacilitator.setIsMonolingualUser(
                mRichImm.isSystemLocaleSameAsLocaleOfAllEnabledSubtypesOfEnabledImes());
        mPersonalizationDictionaryUpdater.onLoadSettings(
                currentSettingsValues.mUsePersonalizedDicts);
        mContextualDictionaryUpdater.onLoadSettings(currentSettingsValues.mUsePersonalizedDicts);
        final boolean shouldKeepUserHistoryDictionaries;
        if (currentSettingsValues.mUsePersonalizedDicts) {
            shouldKeepUserHistoryDictionaries = true;
        } else {
            shouldKeepUserHistoryDictionaries = false;
        }
        if (!shouldKeepUserHistoryDictionaries) {
            // Remove user history dictionaries.
            PersonalizationHelper.removeAllUserHistoryDictionaries(this);
            mDictionaryFacilitator.clearUserHistoryDictionary();
        }
    }

    // Note that this method is called from a non-UI thread.
    @Override
    public void onUpdateMainDictionaryAvailability(final boolean isMainDictionaryAvailable) {
        final MainKeyboardView mainKeyboardView = mKeyboardSwitcher.getMainKeyboardView();
        if (mainKeyboardView != null) {
            mainKeyboardView.setMainDictionaryAvailability(isMainDictionaryAvailable);
        }
        if (mHandler.hasPendingWaitForDictionaryLoad()) {
            mHandler.cancelWaitForDictionaryLoad();
            mHandler.postResumeSuggestions(false /* shouldDelay */);
        }
    }

    void resetDictionaryFacilitatorIfNecessary() {
        final Locale[] subtypeSwitcherLocales = mRichImm.getCurrentSubtypeLocales();
        if (mDictionaryFacilitator.isForLocales(subtypeSwitcherLocales)) {
            return;
        }
        final Locale[] subtypeLocales;
        if (0 == subtypeSwitcherLocales.length) {
            // This happens in very rare corner cases - for example, immediately after a switch
            // to LatinIME has been requested, about a frame later another switch happens. In this
            // case, we are about to go down but we still don't know it, however the system tells
            // us there is no current subtype.
            Log.e(TAG, "System is reporting no current subtype.");
            subtypeLocales = new Locale[] { getResources().getConfiguration().locale };
        } else {
            subtypeLocales = subtypeSwitcherLocales;
        }
        resetDictionaryFacilitatorForLocale(subtypeLocales);
    }

    /**
     * Reset the facilitator by loading dictionaries for the locales and the current settings values
     *
     * @param locales the locales
     */
    // TODO: make sure the current settings always have the right locales, and read from them
    private void resetDictionaryFacilitatorForLocale(final Locale[] locales) {
        final SettingsValues settingsValues = mSettings.getCurrent();
        mDictionaryFacilitator.resetDictionaries(this /* context */, locales,
                settingsValues.mUseContactsDict, settingsValues.mUsePersonalizedDicts,
                false /* forceReloadMainDictionary */, this);
        if (settingsValues.mAutoCorrectionEnabledPerUserSettings) {
            mInputLogic.mSuggest.setAutoCorrectionThreshold(
                    settingsValues.mAutoCorrectionThreshold);
        }
    }

    /**
     * Reset suggest by loading the main dictionary of the current locale.
     */
    /* package private */ void resetSuggestMainDict() {
        final SettingsValues settingsValues = mSettings.getCurrent();
        mDictionaryFacilitator.resetDictionaries(this /* context */,
                mDictionaryFacilitator.getLocales(), settingsValues.mUseContactsDict,
                settingsValues.mUsePersonalizedDicts, true /* forceReloadMainDictionary */, this);
    }

    @Override
    public void onDestroy() {
        mDictionaryFacilitator.closeDictionaries();
        mPersonalizationDictionaryUpdater.onDestroy();
        mContextualDictionaryUpdater.onDestroy();
        mSettings.onDestroy();
        unregisterReceiver(mConnectivityAndRingerModeChangeReceiver);
        unregisterReceiver(mDictionaryPackInstallReceiver);
        unregisterReceiver(mDictionaryDumpBroadcastReceiver);
        mStatsUtilsManager.onDestroy();
        super.onDestroy();
    }

    @UsedForTesting
    public void recycle() {
        unregisterReceiver(mDictionaryPackInstallReceiver);
        unregisterReceiver(mDictionaryDumpBroadcastReceiver);
        unregisterReceiver(mConnectivityAndRingerModeChangeReceiver);
        mInputLogic.recycle();
    }

    @Override
    public void onConfigurationChanged(final Configuration conf) {
        SettingsValues settingsValues = mSettings.getCurrent();
        if (settingsValues.mDisplayOrientation != conf.orientation) {
            mHandler.startOrientationChanging();
            mInputLogic.onOrientationChange(mSettings.getCurrent());
        }
        if (settingsValues.mHasHardwareKeyboard != Settings.readHasHardwareKeyboard(conf)) {
            // If the state of having a hardware keyboard changed, then we want to reload the
            // settings to adjust for that.
            // TODO: we should probably do this unconditionally here, rather than only when we
            // have a change in hardware keyboard configuration.
            loadSettings();
            settingsValues = mSettings.getCurrent();
            if (settingsValues.mHasHardwareKeyboard) {
                // We call cleanupInternalStateForFinishInput() because it's the right thing to do;
                // however, it seems at the moment the framework is passing us a seemingly valid
                // but actually non-functional InputConnection object. So if this bug ever gets
                // fixed we'll be able to remove the composition, but until it is this code is
                // actually not doing much.
                cleanupInternalStateForFinishInput();
            }
        }
        super.onConfigurationChanged(conf);
    }

    @Override
    public View onCreateInputView() {
        StatsUtils.onCreateInputView();
        return mKeyboardSwitcher.onCreateInputView(mIsHardwareAcceleratedDrawingEnabled);
    }

    @Override
    public void setInputView(final View view) {
        super.setInputView(view);
        mInputView = view;
        mInsetsUpdater = ViewOutlineProviderCompatUtils.setInsetsOutlineProvider(view);
        updateSoftInputWindowLayoutParameters();
        mSuggestionStripView = (SuggestionStripView)view.findViewById(R.id.suggestion_strip_view);
        if (hasSuggestionStripView()) {
            mSuggestionStripView.setListener(this, view);
        }
        mInputLogic.setTextDecoratorUi(new TextDecoratorUi(this, view));
    }

    @Override
    public void setExtractView(final View view) {
        final TextView prevExtractEditText = mExtractEditText;
        super.setExtractView(view);
        TextView nextExtractEditText = null;
        if (view != null) {
            final View extractEditText = view.findViewById(android.R.id.inputExtractEditText);
            if (extractEditText instanceof TextView) {
                nextExtractEditText = (TextView)extractEditText;
            }
        }
        if (prevExtractEditText == nextExtractEditText) {
            return;
        }
        if (prevExtractEditText != null) {
            prevExtractEditText.getViewTreeObserver().removeOnPreDrawListener(
                    mExtractTextViewPreDrawListener);
        }
        mExtractEditText = nextExtractEditText;
        if (mExtractEditText != null) {
            mExtractEditText.getViewTreeObserver().addOnPreDrawListener(
                    mExtractTextViewPreDrawListener);
        }
    }

    void updateCursorAnchorInfo() {
        // CursorAnchorInfo is used on L and later.
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            if (isFullscreenMode() && mExtractEditText != null) {
                mInputLogic.onUpdateCursorAnchorInfo(
                        CursorAnchorInfoUtils.extractFromTextView(mExtractEditText));
            }
        }
    }

    private final ViewTreeObserver.OnPreDrawListener mExtractTextViewPreDrawListener =
            new ViewTreeObserver.OnPreDrawListener() {
                @Override
                public boolean onPreDraw() {
                    updateCursorAnchorInfo();
                    return true;
                }
            };

    @Override
    public void setCandidatesView(final View view) {
        // To ensure that CandidatesView will never be set.
        return;
    }

    @Override
    public void onStartInput(final EditorInfo editorInfo, final boolean restarting) {
        mHandler.onStartInput(editorInfo, restarting);
    }

    @Override
    public void onStartInputView(final EditorInfo editorInfo, final boolean restarting) {
        mHandler.onStartInputView(editorInfo, restarting);
        mStatsUtilsManager.onStartInputView();
    }

    @Override
    public void onFinishInputView(final boolean finishingInput) {
        StatsUtils.onFinishInputView();
        mHandler.onFinishInputView(finishingInput);
        mStatsUtilsManager.onFinishInputView();
        mGestureConsumer = GestureConsumer.NULL_GESTURE_CONSUMER;
    }

    @Override
    public void onFinishInput() {
        mHandler.onFinishInput();
    }

    @Override
    public void onCurrentInputMethodSubtypeChanged(final InputMethodSubtype subtype) {
        // Note that the calling sequence of onCreate() and onCurrentInputMethodSubtypeChanged()
        // is not guaranteed. It may even be called at the same time on a different thread.
        mSubtypeSwitcher.onSubtypeChanged(subtype);
        mInputLogic.onSubtypeChanged(SubtypeLocaleUtils.getCombiningRulesExtraValue(subtype),
                mSettings.getCurrent());
        loadKeyboard();
    }

    void onStartInputInternal(final EditorInfo editorInfo, final boolean restarting) {
        super.onStartInput(editorInfo, restarting);
    }

    @SuppressWarnings("deprecation")
    void onStartInputViewInternal(final EditorInfo editorInfo, final boolean restarting) {
        super.onStartInputView(editorInfo, restarting);
        // Switch to the null consumer to handle cases leading to early exit below, for which we
        // also wouldn't be consuming gesture data.
        mGestureConsumer = GestureConsumer.NULL_GESTURE_CONSUMER;
        mRichImm.clearSubtypeCaches();
        mSubtypeSwitcher.onSubtypeChanged(mRichImm.getCurrentRawSubtype());
        final KeyboardSwitcher switcher = mKeyboardSwitcher;
        switcher.updateKeyboardTheme();
        final MainKeyboardView mainKeyboardView = switcher.getMainKeyboardView();
        // If we are starting input in a different text field from before, we'll have to reload
        // settings, so currentSettingsValues can't be final.
        SettingsValues currentSettingsValues = mSettings.getCurrent();

        if (editorInfo == null) {
            Log.e(TAG, "Null EditorInfo in onStartInputView()");
            if (DebugFlags.DEBUG_ENABLED) {
                throw new NullPointerException("Null EditorInfo in onStartInputView()");
            }
            return;
        }
        if (DEBUG) {
            Log.d(TAG, "onStartInputView: editorInfo:"
                    + String.format("inputType=0x%08x imeOptions=0x%08x",
                            editorInfo.inputType, editorInfo.imeOptions));
            Log.d(TAG, "All caps = "
                    + ((editorInfo.inputType & InputType.TYPE_TEXT_FLAG_CAP_CHARACTERS) != 0)
                    + ", sentence caps = "
                    + ((editorInfo.inputType & InputType.TYPE_TEXT_FLAG_CAP_SENTENCES) != 0)
                    + ", word caps = "
                    + ((editorInfo.inputType & InputType.TYPE_TEXT_FLAG_CAP_WORDS) != 0));
        }
        Log.i(TAG, "Starting input. Cursor position = "
                + editorInfo.initialSelStart + "," + editorInfo.initialSelEnd);
        // TODO: Consolidate these checks with {@link InputAttributes}.
        if (InputAttributes.inPrivateImeOptions(null, NO_MICROPHONE_COMPAT, editorInfo)) {
            Log.w(TAG, "Deprecated private IME option specified: " + editorInfo.privateImeOptions);
            Log.w(TAG, "Use " + getPackageName() + "." + NO_MICROPHONE + " instead");
        }
        if (InputAttributes.inPrivateImeOptions(getPackageName(), FORCE_ASCII, editorInfo)) {
            Log.w(TAG, "Deprecated private IME option specified: " + editorInfo.privateImeOptions);
            Log.w(TAG, "Use EditorInfo.IME_FLAG_FORCE_ASCII flag instead");
        }

        // In landscape mode, this method gets called without the input view being created.
        if (mainKeyboardView == null) {
            return;
        }

        // Update to a gesture consumer with the current editor and IME state.
        mGestureConsumer = GestureConsumer.newInstance(editorInfo,
                mInputLogic.getPrivateCommandPerformer(),
                Arrays.asList(mRichImm.getCurrentSubtypeLocales()),
                switcher.getKeyboard());

        // Forward this event to the accessibility utilities, if enabled.
        final AccessibilityUtils accessUtils = AccessibilityUtils.getInstance();
        if (accessUtils.isTouchExplorationEnabled()) {
            accessUtils.onStartInputViewInternal(mainKeyboardView, editorInfo, restarting);
        }

        final boolean inputTypeChanged = !currentSettingsValues.isSameInputType(editorInfo);
        final boolean isDifferentTextField = !restarting || inputTypeChanged;

        StatsUtils.onStartInputView(editorInfo.inputType,
                Settings.getInstance().getCurrent().mDisplayOrientation,
                !isDifferentTextField);

        if (isDifferentTextField) {
            mSubtypeSwitcher.updateParametersOnStartInputView();
        }

        // The EditorInfo might have a flag that affects fullscreen mode.
        // Note: This call should be done by InputMethodService?
        updateFullscreenMode();

        // ALERT: settings have not been reloaded and there is a chance they may be stale.
        // In the practice, if it is, we should have gotten onConfigurationChanged so it should
        // be fine, but this is horribly confusing and must be fixed AS SOON AS POSSIBLE.

        // In some cases the input connection has not been reset yet and we can't access it. In
        // this case we will need to call loadKeyboard() later, when it's accessible, so that we
        // can go into the correct mode, so we need to do some housekeeping here.
        final boolean needToCallLoadKeyboardLater;
        final Suggest suggest = mInputLogic.mSuggest;
        if (!currentSettingsValues.mHasHardwareKeyboard) {
            // The app calling setText() has the effect of clearing the composing
            // span, so we should reset our state unconditionally, even if restarting is true.
            // We also tell the input logic about the combining rules for the current subtype, so
            // it can adjust its combiners if needed.
            mInputLogic.startInput(mRichImm.getCombiningRulesExtraValueOfCurrentSubtype(),
                    currentSettingsValues);

            resetDictionaryFacilitatorIfNecessary();

            // TODO[IL]: Can the following be moved to InputLogic#startInput?
            if (!mInputLogic.mConnection.resetCachesUponCursorMoveAndReturnSuccess(
                    editorInfo.initialSelStart, editorInfo.initialSelEnd,
                    false /* shouldFinishComposition */)) {
                // Sometimes, while rotating, for some reason the framework tells the app we are not
                // connected to it and that means we can't refresh the cache. In this case, schedule
                // a refresh later.
                // We try resetting the caches up to 5 times before giving up.
                mHandler.postResetCaches(isDifferentTextField, 5 /* remainingTries */);
                // mLastSelection{Start,End} are reset later in this method, no need to do it here
                needToCallLoadKeyboardLater = true;
            } else {
                // When rotating, and when input is starting again in a field from where the focus
                // didn't move (the keyboard having been closed with the back key),
                // initialSelStart and initialSelEnd sometimes are lying. Make a best effort to
                // work around this bug.
                mInputLogic.mConnection.tryFixLyingCursorPosition();
                mHandler.postResumeSuggestionsForStartInput(true /* shouldDelay */);
                needToCallLoadKeyboardLater = false;
            }
        } else {
            // If we have a hardware keyboard we don't need to call loadKeyboard later anyway.
            needToCallLoadKeyboardLater = false;
        }

        if (isDifferentTextField ||
                !currentSettingsValues.hasSameOrientation(getResources().getConfiguration())) {
            loadSettings();