src/com/android/settings/inputmethod/InputMethodAndSubtypeUtil.java - platform/packages/apps/Settings - Git at Google

 /*
  * Copyright (C) 2010 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.settings.inputmethod;

 import android.content.ContentResolver;
 import android.content.SharedPreferences;
 import android.preference.Preference;
 import android.preference.PreferenceScreen;
 import android.preference.TwoStatePreference;
 import android.provider.Settings;
 import android.provider.Settings.SettingNotFoundException;
 import android.text.TextUtils;
 import android.util.Log;
 import android.view.inputmethod.InputMethodInfo;
 import android.view.inputmethod.InputMethodSubtype;

 import com.android.internal.inputmethod.InputMethodUtils;
 import com.android.settings.SettingsPreferenceFragment;

 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Map;

 // TODO: Consolidate this with {@link InputMethodSettingValuesWrapper}.
 class InputMethodAndSubtypeUtil {

     private static final boolean DEBUG = false;
     static final String TAG = "InputMethdAndSubtypeUtil";

     private static final char INPUT_METHOD_SEPARATER = ':';
     private static final char INPUT_METHOD_SUBTYPE_SEPARATER = ';';
     private static final int NOT_A_SUBTYPE_ID = -1;

     private static final TextUtils.SimpleStringSplitter sStringInputMethodSplitter
             = new TextUtils.SimpleStringSplitter(INPUT_METHOD_SEPARATER);

     private static final TextUtils.SimpleStringSplitter sStringInputMethodSubtypeSplitter
             = new TextUtils.SimpleStringSplitter(INPUT_METHOD_SUBTYPE_SEPARATER);

     // InputMethods and subtypes are saved in the settings as follows:
     // ime0;subtype0;subtype1:ime1;subtype0:ime2:ime3;subtype0;subtype1
     static String buildInputMethodsAndSubtypesString(
             final HashMap<String, HashSet<String>> imeToSubtypesMap) {
         final StringBuilder builder = new StringBuilder();
         for (final String imi : imeToSubtypesMap.keySet()) {
             if (builder.length() > 0) {
                 builder.append(INPUT_METHOD_SEPARATER);
             }
             final HashSet<String> subtypeIdSet = imeToSubtypesMap.get(imi);
             builder.append(imi);
             for (final String subtypeId : subtypeIdSet) {
                 builder.append(INPUT_METHOD_SUBTYPE_SEPARATER).append(subtypeId);
             }
         }
         return builder.toString();
     }

     private static String buildInputMethodsString(final HashSet<String> imiList) {
         final StringBuilder builder = new StringBuilder();
         for (final String imi : imiList) {
             if (builder.length() > 0) {
                 builder.append(INPUT_METHOD_SEPARATER);
             }
             builder.append(imi);
         }
         return builder.toString();
     }

     private static int getInputMethodSubtypeSelected(ContentResolver resolver) {
         try {
             return Settings.Secure.getInt(resolver,
                     Settings.Secure.SELECTED_INPUT_METHOD_SUBTYPE);
         } catch (SettingNotFoundException e) {
             return NOT_A_SUBTYPE_ID;
         }
     }

     private static boolean isInputMethodSubtypeSelected(ContentResolver resolver) {
         return getInputMethodSubtypeSelected(resolver) != NOT_A_SUBTYPE_ID;
     }

     private static void putSelectedInputMethodSubtype(ContentResolver resolver, int hashCode) {
         Settings.Secure.putInt(resolver, Settings.Secure.SELECTED_INPUT_METHOD_SUBTYPE, hashCode);
     }

     // Needs to modify InputMethodManageService if you want to change the format of saved string.
     private static HashMap<String, HashSet<String>> getEnabledInputMethodsAndSubtypeList(
             ContentResolver resolver) {
         final String enabledInputMethodsStr = Settings.Secure.getString(
                 resolver, Settings.Secure.ENABLED_INPUT_METHODS);
         if (DEBUG) {
             Log.d(TAG, "--- Load enabled input methods: " + enabledInputMethodsStr);
         }
         return parseInputMethodsAndSubtypesString(enabledInputMethodsStr);
     }

     static HashMap<String, HashSet<String>> parseInputMethodsAndSubtypesString(
             final String inputMethodsAndSubtypesString) {
         final HashMap<String, HashSet<String>> subtypesMap = new HashMap<>();
         if (TextUtils.isEmpty(inputMethodsAndSubtypesString)) {
             return subtypesMap;
         }
         sStringInputMethodSplitter.setString(inputMethodsAndSubtypesString);
         while (sStringInputMethodSplitter.hasNext()) {
             final String nextImsStr = sStringInputMethodSplitter.next();
             sStringInputMethodSubtypeSplitter.setString(nextImsStr);
             if (sStringInputMethodSubtypeSplitter.hasNext()) {
                 final HashSet<String> subtypeIdSet = new HashSet<>();
                 // The first element is {@link InputMethodInfoId}.
                 final String imiId = sStringInputMethodSubtypeSplitter.next();
                 while (sStringInputMethodSubtypeSplitter.hasNext()) {
                     subtypeIdSet.add(sStringInputMethodSubtypeSplitter.next());
                 }
                 subtypesMap.put(imiId, subtypeIdSet);
             }
         }
         return subtypesMap;
     }

     static void enableInputMethodSubtypesOf(final ContentResolver resolver, final String imiId,
             final HashSet<String> enabledSubtypeIdSet) {
         final HashMap<String, HashSet<String>> enabledImeAndSubtypeIdsMap =
                 getEnabledInputMethodsAndSubtypeList(resolver);
         enabledImeAndSubtypeIdsMap.put(imiId, enabledSubtypeIdSet);
         final String enabledImesAndSubtypesString = buildInputMethodsAndSubtypesString(
                 enabledImeAndSubtypeIdsMap);
         Settings.Secure.putString(resolver,
                 Settings.Secure.ENABLED_INPUT_METHODS, enabledImesAndSubtypesString);
     }

     private static HashSet<String> getDisabledSystemIMEs(ContentResolver resolver) {
         HashSet<String> set = new HashSet<>();
         String disabledIMEsStr = Settings.Secure.getString(
                 resolver, Settings.Secure.DISABLED_SYSTEM_INPUT_METHODS);
         if (TextUtils.isEmpty(disabledIMEsStr)) {
             return set;
         }
         sStringInputMethodSplitter.setString(disabledIMEsStr);
         while(sStringInputMethodSplitter.hasNext()) {
             set.add(sStringInputMethodSplitter.next());
         }
         return set;
     }

     static void saveInputMethodSubtypeList(SettingsPreferenceFragment context,
             ContentResolver resolver, List<InputMethodInfo> inputMethodInfos,
             boolean hasHardKeyboard) {
         String currentInputMethodId = Settings.Secure.getString(resolver,
                 Settings.Secure.DEFAULT_INPUT_METHOD);
         final int selectedInputMethodSubtype = getInputMethodSubtypeSelected(resolver);
         final HashMap<String, HashSet<String>> enabledIMEsAndSubtypesMap =
                 getEnabledInputMethodsAndSubtypeList(resolver);
         final HashSet<String> disabledSystemIMEs = getDisabledSystemIMEs(resolver);

         boolean needsToResetSelectedSubtype = false;
         for (final InputMethodInfo imi : inputMethodInfos) {
             final String imiId = imi.getId();
             final Preference pref = context.findPreference(imiId);
             if (pref == null) {
                 continue;
             }
             // In the choose input method screen or in the subtype enabler screen,
             // <code>pref</code> is an instance of TwoStatePreference.
             final boolean isImeChecked = (pref instanceof TwoStatePreference) ?
                     ((TwoStatePreference) pref).isChecked()
                     : enabledIMEsAndSubtypesMap.containsKey(imiId);
             final boolean isCurrentInputMethod = imiId.equals(currentInputMethodId);
             final boolean systemIme = InputMethodUtils.isSystemIme(imi);
             if ((!hasHardKeyboard && InputMethodSettingValuesWrapper.getInstance(
                     context.getActivity()).isAlwaysCheckedIme(imi, context.getActivity()))
                     || isImeChecked) {
                 if (!enabledIMEsAndSubtypesMap.containsKey(imiId)) {
                     // imiId has just been enabled
                     enabledIMEsAndSubtypesMap.put(imiId, new HashSet<String>());
                 }
                 final HashSet<String> subtypesSet = enabledIMEsAndSubtypesMap.get(imiId);

                 boolean subtypePrefFound = false;
                 final int subtypeCount = imi.getSubtypeCount();
                 for (int i = 0; i < subtypeCount; ++i) {
                     final InputMethodSubtype subtype = imi.getSubtypeAt(i);
                     final String subtypeHashCodeStr = String.valueOf(subtype.hashCode());
                     final TwoStatePreference subtypePref = (TwoStatePreference) context
                             .findPreference(imiId + subtypeHashCodeStr);
                     // In the Configure input method screen which does not have subtype preferences.
                     if (subtypePref == null) {
                         continue;
                     }
                     if (!subtypePrefFound) {
                         // Once subtype preference is found, subtypeSet needs to be cleared.
                         // Because of system change, hashCode value could have been changed.
                         subtypesSet.clear();
                         // If selected subtype preference is disabled, needs to reset.
                         needsToResetSelectedSubtype = true;
                         subtypePrefFound = true;
                     }
                     if (subtypePref.isChecked()) {
                         subtypesSet.add(subtypeHashCodeStr);
                         if (isCurrentInputMethod) {
                             if (selectedInputMethodSubtype == subtype.hashCode()) {
                                 // Selected subtype is still enabled, there is no need to reset
                                 // selected subtype.
                                 needsToResetSelectedSubtype = false;
                             }
                         }
                     } else {
                         subtypesSet.remove(subtypeHashCodeStr);
                     }
                 }
             } else {
                 enabledIMEsAndSubtypesMap.remove(imiId);
                 if (isCurrentInputMethod) {
                     // We are processing the current input method, but found that it's not enabled.
                     // This means that the current input method has been uninstalled.
                     // If currentInputMethod is already uninstalled, InputMethodManagerService will
                     // find the applicable IME from the history and the system locale.
                     if (DEBUG) {
                         Log.d(TAG, "Current IME was uninstalled or disabled.");
                     }
                     currentInputMethodId = null;
                 }
             }
             // If it's a disabled system ime, add it to the disabled list so that it
             // doesn't get enabled automatically on any changes to the package list
             if (systemIme && hasHardKeyboard) {
                 if (disabledSystemIMEs.contains(imiId)) {
                     if (isImeChecked) {
                         disabledSystemIMEs.remove(imiId);
                     }
                 } else {
                     if (!isImeChecked) {
                         disabledSystemIMEs.add(imiId);
                     }
                 }
             }
         }

         final String enabledIMEsAndSubtypesString = buildInputMethodsAndSubtypesString(
                 enabledIMEsAndSubtypesMap);
         final String disabledSystemIMEsString = buildInputMethodsString(disabledSystemIMEs);
         if (DEBUG) {
             Log.d(TAG, "--- Save enabled inputmethod settings. :" + enabledIMEsAndSubtypesString);
             Log.d(TAG, "--- Save disabled system inputmethod settings. :"
                     + disabledSystemIMEsString);
             Log.d(TAG, "--- Save default inputmethod settings. :" + currentInputMethodId);
             Log.d(TAG, "--- Needs to reset the selected subtype :" + needsToResetSelectedSubtype);
             Log.d(TAG, "--- Subtype is selected :" + isInputMethodSubtypeSelected(resolver));
         }

         // Redefines SelectedSubtype when all subtypes are unchecked or there is no subtype
         // selected. And if the selected subtype of the current input method was disabled,
         // We should reset the selected input method's subtype.
         if (needsToResetSelectedSubtype || !isInputMethodSubtypeSelected(resolver)) {
             if (DEBUG) {
                 Log.d(TAG, "--- Reset inputmethod subtype because it's not defined.");
             }
             putSelectedInputMethodSubtype(resolver, NOT_A_SUBTYPE_ID);
         }

         Settings.Secure.putString(resolver,
                 Settings.Secure.ENABLED_INPUT_METHODS, enabledIMEsAndSubtypesString);
         if (disabledSystemIMEsString.length() > 0) {
             Settings.Secure.putString(resolver, Settings.Secure.DISABLED_SYSTEM_INPUT_METHODS,
                     disabledSystemIMEsString);
         }
         // If the current input method is unset, InputMethodManagerService will find the applicable
         // IME from the history and the system locale.
         Settings.Secure.putString(resolver, Settings.Secure.DEFAULT_INPUT_METHOD,
                 currentInputMethodId != null ? currentInputMethodId : "");
     }

     static void loadInputMethodSubtypeList(final SettingsPreferenceFragment context,
             final ContentResolver resolver, final List<InputMethodInfo> inputMethodInfos,
             final Map<String, List<Preference>> inputMethodPrefsMap) {
         final HashMap<String, HashSet<String>> enabledSubtypes =
                 getEnabledInputMethodsAndSubtypeList(resolver);

         for (final InputMethodInfo imi : inputMethodInfos) {
             final String imiId = imi.getId();
             final Preference pref = context.findPreference(imiId);
             if (pref instanceof TwoStatePreference) {
                 final TwoStatePreference subtypePref = (TwoStatePreference) pref;
                 final boolean isEnabled = enabledSubtypes.containsKey(imiId);
                 subtypePref.setChecked(isEnabled);
                 if (inputMethodPrefsMap != null) {
                     for (final Preference childPref: inputMethodPrefsMap.get(imiId)) {
                         childPref.setEnabled(isEnabled);
                     }
                 }
                 setSubtypesPreferenceEnabled(context, inputMethodInfos, imiId, isEnabled);
             }
         }
         updateSubtypesPreferenceChecked(context, inputMethodInfos, enabledSubtypes);
     }

     static void setSubtypesPreferenceEnabled(final SettingsPreferenceFragment context,
             final List<InputMethodInfo> inputMethodProperties, final String id,
             final boolean enabled) {
         final PreferenceScreen preferenceScreen = context.getPreferenceScreen();
         for (final InputMethodInfo imi : inputMethodProperties) {
             if (id.equals(imi.getId())) {
                 final int subtypeCount = imi.getSubtypeCount();
                 for (int i = 0; i < subtypeCount; ++i) {
                     final InputMethodSubtype subtype = imi.getSubtypeAt(i);
                     final TwoStatePreference pref = (TwoStatePreference) preferenceScreen
                             .findPreference(id + subtype.hashCode());
                     if (pref != null) {
                         pref.setEnabled(enabled);
                     }
                 }
             }
         }
     }

     private static void updateSubtypesPreferenceChecked(final SettingsPreferenceFragment context,
             final List<InputMethodInfo> inputMethodProperties,
             final HashMap<String, HashSet<String>> enabledSubtypes) {
         final PreferenceScreen preferenceScreen = context.getPreferenceScreen();
         for (final InputMethodInfo imi : inputMethodProperties) {
             final String id = imi.getId();
             if (!enabledSubtypes.containsKey(id)) {
                 // There is no need to enable/disable subtypes of disabled IMEs.
                 continue;
             }
             final HashSet<String> enabledSubtypesSet = enabledSubtypes.get(id);
             final int subtypeCount = imi.getSubtypeCount();
             for (int i = 0; i < subtypeCount; ++i) {
                 final InputMethodSubtype subtype = imi.getSubtypeAt(i);
                 final String hashCode = String.valueOf(subtype.hashCode());
                 if (DEBUG) {
                     Log.d(TAG, "--- Set checked state: " + "id" + ", " + hashCode + ", "
                             + enabledSubtypesSet.contains(hashCode));
                 }
                 final TwoStatePreference pref = (TwoStatePreference) preferenceScreen
                         .findPreference(id + hashCode);
                 if (pref != null) {
                     pref.setChecked(enabledSubtypesSet.contains(hashCode));
                 }
             }
         }
     }

     static void removeUnnecessaryNonPersistentPreference(final Preference pref) {
         final String key = pref.getKey();
         if (pref.isPersistent() || key == null) {
             return;
         }
         final SharedPreferences prefs = pref.getSharedPreferences();
         if (prefs != null && prefs.contains(key)) {
             prefs.edit().remove(key).apply();
         }
     }
 }
	/*
	* Copyright (C) 2010 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.settings.inputmethod;

	import android.content.ContentResolver;
	import android.content.SharedPreferences;
	import android.preference.Preference;
	import android.preference.PreferenceScreen;
	import android.preference.TwoStatePreference;
	import android.provider.Settings;
	import android.provider.Settings.SettingNotFoundException;
	import android.text.TextUtils;
	import android.util.Log;
	import android.view.inputmethod.InputMethodInfo;
	import android.view.inputmethod.InputMethodSubtype;

	import com.android.internal.inputmethod.InputMethodUtils;
	import com.android.settings.SettingsPreferenceFragment;

	import java.util.HashMap;
	import java.util.HashSet;
	import java.util.List;
	import java.util.Map;

	// TODO: Consolidate this with {@link InputMethodSettingValuesWrapper}.
	class InputMethodAndSubtypeUtil {

	private static final boolean DEBUG = false;
	static final String TAG = "InputMethdAndSubtypeUtil";

	private static final char INPUT_METHOD_SEPARATER = ':';
	private static final char INPUT_METHOD_SUBTYPE_SEPARATER = ';';
	private static final int NOT_A_SUBTYPE_ID = -1;

	private static final TextUtils.SimpleStringSplitter sStringInputMethodSplitter
	= new TextUtils.SimpleStringSplitter(INPUT_METHOD_SEPARATER);

	private static final TextUtils.SimpleStringSplitter sStringInputMethodSubtypeSplitter
	= new TextUtils.SimpleStringSplitter(INPUT_METHOD_SUBTYPE_SEPARATER);

	// InputMethods and subtypes are saved in the settings as follows:
	// ime0;subtype0;subtype1:ime1;subtype0:ime2:ime3;subtype0;subtype1
	static String buildInputMethodsAndSubtypesString(
	final HashMap<String, HashSet<String>> imeToSubtypesMap) {
	final StringBuilder builder = new StringBuilder();
	for (final String imi : imeToSubtypesMap.keySet()) {
	if (builder.length() > 0) {
	builder.append(INPUT_METHOD_SEPARATER);
	}
	final HashSet<String> subtypeIdSet = imeToSubtypesMap.get(imi);
	builder.append(imi);
	for (final String subtypeId : subtypeIdSet) {
	builder.append(INPUT_METHOD_SUBTYPE_SEPARATER).append(subtypeId);
	}
	}
	return builder.toString();
	}

	private static String buildInputMethodsString(final HashSet<String> imiList) {
	final StringBuilder builder = new StringBuilder();
	for (final String imi : imiList) {
	if (builder.length() > 0) {
	builder.append(INPUT_METHOD_SEPARATER);
	}
	builder.append(imi);
	}
	return builder.toString();
	}

	private static int getInputMethodSubtypeSelected(ContentResolver resolver) {
	try {
	return Settings.Secure.getInt(resolver,
	Settings.Secure.SELECTED_INPUT_METHOD_SUBTYPE);
	} catch (SettingNotFoundException e) {
	return NOT_A_SUBTYPE_ID;
	}
	}

	private static boolean isInputMethodSubtypeSelected(ContentResolver resolver) {
	return getInputMethodSubtypeSelected(resolver) != NOT_A_SUBTYPE_ID;
	}

	private static void putSelectedInputMethodSubtype(ContentResolver resolver, int hashCode) {
	Settings.Secure.putInt(resolver, Settings.Secure.SELECTED_INPUT_METHOD_SUBTYPE, hashCode);
	}

	// Needs to modify InputMethodManageService if you want to change the format of saved string.
	private static HashMap<String, HashSet<String>> getEnabledInputMethodsAndSubtypeList(
	ContentResolver resolver) {
	final String enabledInputMethodsStr = Settings.Secure.getString(
	resolver, Settings.Secure.ENABLED_INPUT_METHODS);
	if (DEBUG) {
	Log.d(TAG, "--- Load enabled input methods: " + enabledInputMethodsStr);
	}
	return parseInputMethodsAndSubtypesString(enabledInputMethodsStr);
	}

	static HashMap<String, HashSet<String>> parseInputMethodsAndSubtypesString(
	final String inputMethodsAndSubtypesString) {
	final HashMap<String, HashSet<String>> subtypesMap = new HashMap<>();
	if (TextUtils.isEmpty(inputMethodsAndSubtypesString)) {
	return subtypesMap;
	}
	sStringInputMethodSplitter.setString(inputMethodsAndSubtypesString);
	while (sStringInputMethodSplitter.hasNext()) {
	final String nextImsStr = sStringInputMethodSplitter.next();
	sStringInputMethodSubtypeSplitter.setString(nextImsStr);
	if (sStringInputMethodSubtypeSplitter.hasNext()) {
	final HashSet<String> subtypeIdSet = new HashSet<>();
	// The first element is {@link InputMethodInfoId}.
	final String imiId = sStringInputMethodSubtypeSplitter.next();
	while (sStringInputMethodSubtypeSplitter.hasNext()) {
	subtypeIdSet.add(sStringInputMethodSubtypeSplitter.next());
	}
	subtypesMap.put(imiId, subtypeIdSet);
	}
	}
	return subtypesMap;
	}

	static void enableInputMethodSubtypesOf(final ContentResolver resolver, final String imiId,
	final HashSet<String> enabledSubtypeIdSet) {
	final HashMap<String, HashSet<String>> enabledImeAndSubtypeIdsMap =
	getEnabledInputMethodsAndSubtypeList(resolver);
	enabledImeAndSubtypeIdsMap.put(imiId, enabledSubtypeIdSet);
	final String enabledImesAndSubtypesString = buildInputMethodsAndSubtypesString(
	enabledImeAndSubtypeIdsMap);
	Settings.Secure.putString(resolver,
	Settings.Secure.ENABLED_INPUT_METHODS, enabledImesAndSubtypesString);
	}

	private static HashSet<String> getDisabledSystemIMEs(ContentResolver resolver) {
	HashSet<String> set = new HashSet<>();
	String disabledIMEsStr = Settings.Secure.getString(
	resolver, Settings.Secure.DISABLED_SYSTEM_INPUT_METHODS);
	if (TextUtils.isEmpty(disabledIMEsStr)) {
	return set;
	}
	sStringInputMethodSplitter.setString(disabledIMEsStr);
	while(sStringInputMethodSplitter.hasNext()) {
	set.add(sStringInputMethodSplitter.next());
	}
	return set;
	}

	static void saveInputMethodSubtypeList(SettingsPreferenceFragment context,
	ContentResolver resolver, List<InputMethodInfo> inputMethodInfos,
	boolean hasHardKeyboard) {
	String currentInputMethodId = Settings.Secure.getString(resolver,
	Settings.Secure.DEFAULT_INPUT_METHOD);
	final int selectedInputMethodSubtype = getInputMethodSubtypeSelected(resolver);
	final HashMap<String, HashSet<String>> enabledIMEsAndSubtypesMap =
	getEnabledInputMethodsAndSubtypeList(resolver);
	final HashSet<String> disabledSystemIMEs = getDisabledSystemIMEs(resolver);

	boolean needsToResetSelectedSubtype = false;
	for (final InputMethodInfo imi : inputMethodInfos) {
	final String imiId = imi.getId();
	final Preference pref = context.findPreference(imiId);
	if (pref == null) {
	continue;
	}
	// In the choose input method screen or in the subtype enabler screen,
	// <code>pref</code> is an instance of TwoStatePreference.
	final boolean isImeChecked = (pref instanceof TwoStatePreference) ?
	((TwoStatePreference) pref).isChecked()
	: enabledIMEsAndSubtypesMap.containsKey(imiId);
	final boolean isCurrentInputMethod = imiId.equals(currentInputMethodId);
	final boolean systemIme = InputMethodUtils.isSystemIme(imi);
	if ((!hasHardKeyboard && InputMethodSettingValuesWrapper.getInstance(
	context.getActivity()).isAlwaysCheckedIme(imi, context.getActivity()))
	\|\| isImeChecked) {
	if (!enabledIMEsAndSubtypesMap.containsKey(imiId)) {
	// imiId has just been enabled
	enabledIMEsAndSubtypesMap.put(imiId, new HashSet<String>());
	}
	final HashSet<String> subtypesSet = enabledIMEsAndSubtypesMap.get(imiId);

	boolean subtypePrefFound = false;
	final int subtypeCount = imi.getSubtypeCount();
	for (int i = 0; i < subtypeCount; ++i) {
	final InputMethodSubtype subtype = imi.getSubtypeAt(i);
	final String subtypeHashCodeStr = String.valueOf(subtype.hashCode());
	final TwoStatePreference subtypePref = (TwoStatePreference) context
	.findPreference(imiId + subtypeHashCodeStr);
	// In the Configure input method screen which does not have subtype preferences.
	if (subtypePref == null) {
	continue;
	}
	if (!subtypePrefFound) {
	// Once subtype preference is found, subtypeSet needs to be cleared.
	// Because of system change, hashCode value could have been changed.
	subtypesSet.clear();
	// If selected subtype preference is disabled, needs to reset.
	needsToResetSelectedSubtype = true;
	subtypePrefFound = true;
	}
	if (subtypePref.isChecked()) {
	subtypesSet.add(subtypeHashCodeStr);
	if (isCurrentInputMethod) {
	if (selectedInputMethodSubtype == subtype.hashCode()) {
	// Selected subtype is still enabled, there is no need to reset
	// selected subtype.
	needsToResetSelectedSubtype = false;
	}
	}
	} else {
	subtypesSet.remove(subtypeHashCodeStr);
	}
	}
	} else {
	enabledIMEsAndSubtypesMap.remove(imiId);
	if (isCurrentInputMethod) {
	// We are processing the current input method, but found that it's not enabled.
	// This means that the current input method has been uninstalled.
	// If currentInputMethod is already uninstalled, InputMethodManagerService will
	// find the applicable IME from the history and the system locale.
	if (DEBUG) {
	Log.d(TAG, "Current IME was uninstalled or disabled.");
	}
	currentInputMethodId = null;
	}
	}
	// If it's a disabled system ime, add it to the disabled list so that it
	// doesn't get enabled automatically on any changes to the package list
	if (systemIme && hasHardKeyboard) {
	if (disabledSystemIMEs.contains(imiId)) {
	if (isImeChecked) {
	disabledSystemIMEs.remove(imiId);
	}
	} else {
	if (!isImeChecked) {
	disabledSystemIMEs.add(imiId);
	}
	}
	}
	}

	final String enabledIMEsAndSubtypesString = buildInputMethodsAndSubtypesString(
	enabledIMEsAndSubtypesMap);
	final String disabledSystemIMEsString = buildInputMethodsString(disabledSystemIMEs);
	if (DEBUG) {
	Log.d(TAG, "--- Save enabled inputmethod settings. :" + enabledIMEsAndSubtypesString);
	Log.d(TAG, "--- Save disabled system inputmethod settings. :"
	+ disabledSystemIMEsString);
	Log.d(TAG, "--- Save default inputmethod settings. :" + currentInputMethodId);
	Log.d(TAG, "--- Needs to reset the selected subtype :" + needsToResetSelectedSubtype);
	Log.d(TAG, "--- Subtype is selected :" + isInputMethodSubtypeSelected(resolver));
	}

	// Redefines SelectedSubtype when all subtypes are unchecked or there is no subtype
	// selected. And if the selected subtype of the current input method was disabled,
	// We should reset the selected input method's subtype.
	if (needsToResetSelectedSubtype \|\| !isInputMethodSubtypeSelected(resolver)) {
	if (DEBUG) {
	Log.d(TAG, "--- Reset inputmethod subtype because it's not defined.");
	}
	putSelectedInputMethodSubtype(resolver, NOT_A_SUBTYPE_ID);
	}

	Settings.Secure.putString(resolver,
	Settings.Secure.ENABLED_INPUT_METHODS, enabledIMEsAndSubtypesString);
	if (disabledSystemIMEsString.length() > 0) {
	Settings.Secure.putString(resolver, Settings.Secure.DISABLED_SYSTEM_INPUT_METHODS,
	disabledSystemIMEsString);
	}
	// If the current input method is unset, InputMethodManagerService will find the applicable
	// IME from the history and the system locale.
	Settings.Secure.putString(resolver, Settings.Secure.DEFAULT_INPUT_METHOD,
	currentInputMethodId != null ? currentInputMethodId : "");
	}

	static void loadInputMethodSubtypeList(final SettingsPreferenceFragment context,
	final ContentResolver resolver, final List<InputMethodInfo> inputMethodInfos,
	final Map<String, List<Preference>> inputMethodPrefsMap) {
	final HashMap<String, HashSet<String>> enabledSubtypes =
	getEnabledInputMethodsAndSubtypeList(resolver);

	for (final InputMethodInfo imi : inputMethodInfos) {
	final String imiId = imi.getId();
	final Preference pref = context.findPreference(imiId);
	if (pref instanceof TwoStatePreference) {
	final TwoStatePreference subtypePref = (TwoStatePreference) pref;
	final boolean isEnabled = enabledSubtypes.containsKey(imiId);
	subtypePref.setChecked(isEnabled);
	if (inputMethodPrefsMap != null) {
	for (final Preference childPref: inputMethodPrefsMap.get(imiId)) {
	childPref.setEnabled(isEnabled);
	}
	}
	setSubtypesPreferenceEnabled(context, inputMethodInfos, imiId, isEnabled);
	}
	}
	updateSubtypesPreferenceChecked(context, inputMethodInfos, enabledSubtypes);
	}

	static void setSubtypesPreferenceEnabled(final SettingsPreferenceFragment context,
	final List<InputMethodInfo> inputMethodProperties, final String id,
	final boolean enabled) {
	final PreferenceScreen preferenceScreen = context.getPreferenceScreen();
	for (final InputMethodInfo imi : inputMethodProperties) {
	if (id.equals(imi.getId())) {
	final int subtypeCount = imi.getSubtypeCount();
	for (int i = 0; i < subtypeCount; ++i) {
	final InputMethodSubtype subtype = imi.getSubtypeAt(i);
	final TwoStatePreference pref = (TwoStatePreference) preferenceScreen
	.findPreference(id + subtype.hashCode());
	if (pref != null) {
	pref.setEnabled(enabled);
	}
	}
	}
	}
	}

	private static void updateSubtypesPreferenceChecked(final SettingsPreferenceFragment context,
	final List<InputMethodInfo> inputMethodProperties,
	final HashMap<String, HashSet<String>> enabledSubtypes) {
	final PreferenceScreen preferenceScreen = context.getPreferenceScreen();
	for (final InputMethodInfo imi : inputMethodProperties) {
	final String id = imi.getId();
	if (!enabledSubtypes.containsKey(id)) {
	// There is no need to enable/disable subtypes of disabled IMEs.
	continue;
	}
	final HashSet<String> enabledSubtypesSet = enabledSubtypes.get(id);
	final int subtypeCount = imi.getSubtypeCount();
	for (int i = 0; i < subtypeCount; ++i) {
	final InputMethodSubtype subtype = imi.getSubtypeAt(i);
	final String hashCode = String.valueOf(subtype.hashCode());
	if (DEBUG) {
	Log.d(TAG, "--- Set checked state: " + "id" + ", " + hashCode + ", "
	+ enabledSubtypesSet.contains(hashCode));
	}
	final TwoStatePreference pref = (TwoStatePreference) preferenceScreen
	.findPreference(id + hashCode);
	if (pref != null) {
	pref.setChecked(enabledSubtypesSet.contains(hashCode));
	}
	}
	}
	}

	static void removeUnnecessaryNonPersistentPreference(final Preference pref) {
	final String key = pref.getKey();
	if (pref.isPersistent() \|\| key == null) {
	return;
	}
	final SharedPreferences prefs = pref.getSharedPreferences();
	if (prefs != null && prefs.contains(key)) {
	prefs.edit().remove(key).apply();
	}
	}
	}