src/com/android/phone/ShortcutViewUtils.java - platform/packages/services/Telephony - Gitiles

 /*
  * Copyright (C) 2019 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.phone;

 import android.content.Context;
 import android.os.PersistableBundle;
 import android.provider.Settings;
 import android.telecom.PhoneAccount;
 import android.telecom.PhoneAccountHandle;
 import android.telecom.TelecomManager;
 import android.telephony.CarrierConfigManager;
 import android.telephony.SubscriptionManager;
 import android.telephony.TelephonyManager;
 import android.telephony.emergency.EmergencyNumber;
 import android.text.TextUtils;
 import android.util.ArrayMap;
 import android.util.Log;

 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;

 import com.android.internal.util.ArrayUtils;

 import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;

 class ShortcutViewUtils {
     private static final String LOG_TAG = "ShortcutViewUtils";

     // Emergency services which will be promoted on the shortcut view.
     static final int[] PROMOTED_CATEGORIES = {
             EmergencyNumber.EMERGENCY_SERVICE_CATEGORY_POLICE,
             EmergencyNumber.EMERGENCY_SERVICE_CATEGORY_AMBULANCE,
             EmergencyNumber.EMERGENCY_SERVICE_CATEGORY_FIRE_BRIGADE,
     };

     static final int PROMOTED_CATEGORIES_BITMASK;

     static {
         int bitmask = 0;
         for (int category : PROMOTED_CATEGORIES) {
             bitmask |= category;
         }
         PROMOTED_CATEGORIES_BITMASK = bitmask;
     }

     static class Config {
         private final boolean mCanEnableShortcutView;
         private PhoneInfo mPhoneInfo = null;

         Config(@NonNull Context context, PersistableBundle carrierConfig, int entryType) {
             mCanEnableShortcutView = canEnableShortcutView(carrierConfig, entryType);
             refresh(context);
         }

         void refresh(@NonNull Context context) {
             if (mCanEnableShortcutView && !isAirplaneModeOn(context)) {
                 mPhoneInfo = ShortcutViewUtils.pickPreferredPhone(context);
             } else {
                 mPhoneInfo = null;
             }
         }

         boolean isEnabled() {
             return mPhoneInfo != null;
         }

         PhoneInfo getPhoneInfo() {
             return mPhoneInfo;
         }

         String getCountryIso() {
             if (mPhoneInfo == null) {
                 return null;
             }
             return mPhoneInfo.getCountryIso();
         }

         boolean hasPromotedEmergencyNumber(String number) {
             if (mPhoneInfo == null) {
                 return false;
             }
             return mPhoneInfo.hasPromotedEmergencyNumber(number);
         }

         private boolean canEnableShortcutView(PersistableBundle carrierConfig, int entryType) {
             if (entryType != EmergencyDialer.ENTRY_TYPE_POWER_MENU) {
                 Log.d(LOG_TAG, "Disables shortcut view since it's not launched from power menu");
                 return false;
             }
             if (carrierConfig == null || !carrierConfig.getBoolean(
                     CarrierConfigManager.KEY_SUPPORT_EMERGENCY_DIALER_SHORTCUT_BOOL)) {
                 Log.d(LOG_TAG, "Disables shortcut view by carrier requirement");
                 return false;
             }
             return true;
         }

         private boolean isAirplaneModeOn(@NonNull Context context) {
             return Settings.Global.getInt(context.getContentResolver(),
                     Settings.Global.AIRPLANE_MODE_ON, 0) != 0;
         }
     }

     // Info and emergency call capability of every phone.
     static class PhoneInfo {
         private final PhoneAccountHandle mHandle;
         private final boolean mCanPlaceEmergencyCall;
         private final int mSubId;
         private final String mCountryIso;
         private final List<EmergencyNumber> mPromotedEmergencyNumbers;

         private PhoneInfo(int subId, String countryIso,
                 List<EmergencyNumber> promotedEmergencyNumbers) {
             this(null, true, subId, countryIso, promotedEmergencyNumbers);
         }

         private PhoneInfo(PhoneAccountHandle handle, boolean canPlaceEmergencyCall, int subId,
                 String countryIso, List<EmergencyNumber> promotedEmergencyNumbers) {
             mHandle = handle;
             mCanPlaceEmergencyCall = canPlaceEmergencyCall;
             mSubId = subId;
             mCountryIso = countryIso;
             mPromotedEmergencyNumbers = promotedEmergencyNumbers;
         }

         public PhoneAccountHandle getPhoneAccountHandle() {
             return mHandle;
         }

         public boolean canPlaceEmergencyCall() {
             return mCanPlaceEmergencyCall;
         }

         public int getSubId() {
             return mSubId;
         }

         public String getCountryIso() {
             return mCountryIso;
         }

         public List<EmergencyNumber> getPromotedEmergencyNumbers() {
             return mPromotedEmergencyNumbers;
         }

         public boolean isSufficientForEmergencyCall(@NonNull Context context) {
             // Checking mCountryIso because the emergency number list is not reliable to be
             // suggested to users if the device didn't camp to any network. In this case, users
             // can still try to dial emergency numbers with dial pad.
             return mCanPlaceEmergencyCall && mPromotedEmergencyNumbers != null
                     && isSupportedCountry(context, mCountryIso);
         }

         public boolean hasPromotedEmergencyNumber(String number) {
             for (EmergencyNumber emergencyNumber : mPromotedEmergencyNumbers) {
                 if (emergencyNumber.getNumber().equalsIgnoreCase(number)) {
                     return true;
                 }
             }
             return false;
         }

         @Override
         public String toString() {
             StringBuilder sb = new StringBuilder();
             sb.append("{");
             if (mHandle != null) {
                 sb.append("handle=").append(mHandle.getId()).append(", ");
             }
             sb.append("subId=").append(mSubId)
                     .append(", canPlaceEmergencyCall=").append(mCanPlaceEmergencyCall)
                     .append(", networkCountryIso=").append(mCountryIso);
             if (mPromotedEmergencyNumbers != null) {
                 sb.append(", emergencyNumbers=");
                 for (EmergencyNumber emergencyNumber : mPromotedEmergencyNumbers) {
                     sb.append(emergencyNumber.getNumber()).append(":")
                             .append(emergencyNumber).append(",");
                 }
             }
             sb.append("}");
             return sb.toString();
         }
     }

     /**
      * Picks a preferred phone (SIM slot) which is sufficient for emergency call and can provide
      * promoted emergency numbers.
      *
      * A promoted emergency number should be dialed out over the preferred phone. Other emergency
      * numbers should be still dialable over the system default phone.
      *
      * @return A preferred phone and its promoted emergency number, or null if no phone/promoted
      * emergency numbers available.
      */
     @Nullable
     static PhoneInfo pickPreferredPhone(@NonNull Context context) {
         TelephonyManager telephonyManager = context.getSystemService(TelephonyManager.class);
         if (telephonyManager.getPhoneCount() <= 0) {
             Log.w(LOG_TAG, "No phone available!");
             return null;
         }

         Map<Integer, List<EmergencyNumber>> promotedLists =
                 getPromotedEmergencyNumberLists(telephonyManager);
         if (promotedLists == null || promotedLists.isEmpty()) {
             return null;
         }

         // For a multi-phone device, tries the default phone account.
         TelecomManager telecomManager = context.getSystemService(TelecomManager.class);
         PhoneAccountHandle defaultHandle = telecomManager.getDefaultOutgoingPhoneAccount(
                 PhoneAccount.SCHEME_TEL);
         if (defaultHandle != null) {
             PhoneInfo phone = loadPhoneInfo(context, defaultHandle, telephonyManager,
                     telecomManager, promotedLists);
             if (phone.isSufficientForEmergencyCall(context)) {
                 return phone;
             }
             Log.w(LOG_TAG, "Default PhoneAccount is insufficient for emergency call: "
                     + phone.toString());
         } else {
             Log.w(LOG_TAG, "Missing default PhoneAccount! Is this really a phone device?");
         }

         // Looks for any one phone which supports emergency call.
         List<PhoneAccountHandle> allHandles = telecomManager.getCallCapablePhoneAccounts();
         if (allHandles != null && !allHandles.isEmpty()) {
             for (PhoneAccountHandle handle : allHandles) {
                 PhoneInfo phone = loadPhoneInfo(context, handle, telephonyManager, telecomManager,
                         promotedLists);
                 if (phone.isSufficientForEmergencyCall(context)) {
                     return phone;
                 } else {
                     if (Log.isLoggable(LOG_TAG, Log.DEBUG)) {
                         Log.d(LOG_TAG, "PhoneAccount " + phone.toString()
                                 + " is insufficient for emergency call.");
                     }
                 }
             }
         }

         Log.w(LOG_TAG, "No PhoneAccount available for emergency call!");
         return null;
     }

     private static boolean isSupportedCountry(@NonNull Context context, String countryIso) {
         if (TextUtils.isEmpty(countryIso)) {
             return false;
         }

         String[] countrysToEnableShortcutView = context.getResources().getStringArray(
                 R.array.config_countries_to_enable_shortcut_view);
         for (String supportedCountry : countrysToEnableShortcutView) {
             if (countryIso.equalsIgnoreCase(supportedCountry)) {
                 return true;
             }
         }
         return false;
     }

     private static PhoneInfo loadPhoneInfo(
             @NonNull Context context,
             @NonNull PhoneAccountHandle handle,
             @NonNull TelephonyManager telephonyManager,
             @NonNull TelecomManager telecomManager,
             Map<Integer, List<EmergencyNumber>> promotedLists) {
         boolean canPlaceEmergencyCall = false;
         int subId = SubscriptionManager.INVALID_SUBSCRIPTION_ID;
         String countryIso = null;
         List<EmergencyNumber> emergencyNumberList = null;

         PhoneAccount phoneAccount = telecomManager.getPhoneAccount(handle);
         if (phoneAccount != null) {
             canPlaceEmergencyCall = phoneAccount.hasCapabilities(
                     PhoneAccount.CAPABILITY_PLACE_EMERGENCY_CALLS);
             subId = telephonyManager.getSubIdForPhoneAccount(phoneAccount);
         }

         TelephonyManager subTelephonyManager = telephonyManager.createForSubscriptionId(subId);
         if (subTelephonyManager != null) {
             countryIso = subTelephonyManager.getNetworkCountryIso();
         }

         if (promotedLists != null) {
             emergencyNumberList = removeCarrierSpecificPrefixes(context, subId,
                     promotedLists.get(subId));
         }

         return new PhoneInfo(handle, canPlaceEmergencyCall, subId, countryIso, emergencyNumberList);
     }

     @Nullable
     private static String[] getCarrierSpecificPrefixes(@NonNull Context context, int subId) {
         CarrierConfigManager configMgr = context.getSystemService(CarrierConfigManager.class);
         if (configMgr == null) {
             return null;
         }
         PersistableBundle b = configMgr.getConfigForSubId(subId);
         return b == null ? null : b.getStringArray(
                 CarrierConfigManager.KEY_EMERGENCY_NUMBER_PREFIX_STRING_ARRAY);
     }

     // Removes carrier specific emergency number prefixes (if there is any) from every emergency
     // number and create a new list without duplications. Returns the original list if there is no
     // prefixes.
     @NonNull
     private static List<EmergencyNumber> removeCarrierSpecificPrefixes(
             @NonNull Context context,
             int subId,
             @NonNull List<EmergencyNumber> emergencyNumberList) {
         String[] prefixes = getCarrierSpecificPrefixes(context, subId);
         if (ArrayUtils.isEmpty(prefixes)) {
             return emergencyNumberList;
         }

         List<EmergencyNumber> newList = new ArrayList<>(emergencyNumberList.size());
         for (EmergencyNumber emergencyNumber : emergencyNumberList) {
             // If no prefix was removed from emergencyNumber, add it to the newList directly.
             EmergencyNumber newNumber = emergencyNumber;
             String number = emergencyNumber.getNumber();
             for (String prefix : prefixes) {
                 // If emergencyNumber starts with this prefix, remove this prefix to retrieve the
                 // actual emergency number.
                 // However, if emergencyNumber is exactly the same with this prefix, it could be
                 // either a real emergency number, or composed with another prefix. It shouldn't be
                 // processed with this prefix whatever.
                 if (!TextUtils.isEmpty(prefix) && number.startsWith(prefix)
                         && !number.equals(prefix)) {
                     newNumber = new EmergencyNumber(
                             number.substring(prefix.length()),
                             emergencyNumber.getCountryIso(),
                             emergencyNumber.getMnc(),
                             emergencyNumber.getEmergencyServiceCategoryBitmask(),
                             emergencyNumber.getEmergencyUrns(),
                             emergencyNumber.getEmergencyNumberSourceBitmask(),
                             emergencyNumber.getEmergencyCallRouting());
                     // There should not be more than one prefix attached to a number.
                     break;
                 }
             }
             if (!newList.contains(newNumber)) {
                 newList.add(newNumber);
             }
         }
         return newList;
     }

     @NonNull
     private static Map<Integer, List<EmergencyNumber>> getPromotedEmergencyNumberLists(
             @NonNull TelephonyManager telephonyManager) {
         Map<Integer, List<EmergencyNumber>> allLists =
                 telephonyManager.getEmergencyNumberList();
         if (allLists == null || allLists.isEmpty()) {
             Log.w(LOG_TAG, "Unable to retrieve emergency number lists!");
             return new ArrayMap<>();
         }

         boolean isDebugLoggable = Log.isLoggable(LOG_TAG, Log.DEBUG);
         Map<Integer, List<EmergencyNumber>> promotedEmergencyNumberLists = new ArrayMap<>();
         for (Map.Entry<Integer, List<EmergencyNumber>> entry : allLists.entrySet()) {
             if (entry.getKey() == null || entry.getValue() == null) {
                 continue;
             }
             List<EmergencyNumber> emergencyNumberList = entry.getValue();
             if (isDebugLoggable) {
                 Log.d(LOG_TAG, "Emergency numbers of " + entry.getKey());
             }

             // The list of promoted emergency numbers which will be visible on shortcut view.
             List<EmergencyNumber> promotedList = new ArrayList<>();
             // A temporary list for non-prioritized emergency numbers.
             List<EmergencyNumber> tempList = new ArrayList<>();

             for (EmergencyNumber emergencyNumber : emergencyNumberList) {
                 boolean isPromotedCategory = (emergencyNumber.getEmergencyServiceCategoryBitmask()
                         & PROMOTED_CATEGORIES_BITMASK) != 0;

                 // Emergency numbers in DATABASE are prioritized for shortcut view since they were
                 // well-categorized.
                 boolean isFromPrioritizedSource =
                         (emergencyNumber.getEmergencyNumberSourceBitmask()
                                 & EmergencyNumber.EMERGENCY_NUMBER_SOURCE_DATABASE) != 0;
                 if (isDebugLoggable) {
                     Log.d(LOG_TAG, "  " + emergencyNumber
                             + (isPromotedCategory ? "M" : "")
                             + (isFromPrioritizedSource ? "P" : ""));
                 }

                 if (isPromotedCategory) {
                     if (isFromPrioritizedSource) {
                         promotedList.add(emergencyNumber);
                     } else {
                         tempList.add(emergencyNumber);
                     }
                 }
             }
             // Puts numbers in temp list after prioritized numbers.
             promotedList.addAll(tempList);

             if (!promotedList.isEmpty()) {
                 promotedEmergencyNumberLists.put(entry.getKey(), promotedList);
             }
         }

         if (promotedEmergencyNumberLists.isEmpty()) {
             Log.w(LOG_TAG, "No promoted emergency number found!");
         }
         return promotedEmergencyNumberLists;
     }
 }
	/*
	* Copyright (C) 2019 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.phone;

	import android.content.Context;
	import android.os.PersistableBundle;
	import android.provider.Settings;
	import android.telecom.PhoneAccount;
	import android.telecom.PhoneAccountHandle;
	import android.telecom.TelecomManager;
	import android.telephony.CarrierConfigManager;
	import android.telephony.SubscriptionManager;
	import android.telephony.TelephonyManager;
	import android.telephony.emergency.EmergencyNumber;
	import android.text.TextUtils;
	import android.util.ArrayMap;
	import android.util.Log;

	import androidx.annotation.NonNull;
	import androidx.annotation.Nullable;

	import com.android.internal.util.ArrayUtils;

	import java.util.ArrayList;
	import java.util.List;
	import java.util.Map;

	class ShortcutViewUtils {
	private static final String LOG_TAG = "ShortcutViewUtils";

	// Emergency services which will be promoted on the shortcut view.
	static final int[] PROMOTED_CATEGORIES = {
	EmergencyNumber.EMERGENCY_SERVICE_CATEGORY_POLICE,
	EmergencyNumber.EMERGENCY_SERVICE_CATEGORY_AMBULANCE,
	EmergencyNumber.EMERGENCY_SERVICE_CATEGORY_FIRE_BRIGADE,
	};

	static final int PROMOTED_CATEGORIES_BITMASK;

	static {
	int bitmask = 0;
	for (int category : PROMOTED_CATEGORIES) {
	bitmask \|= category;
	}
	PROMOTED_CATEGORIES_BITMASK = bitmask;
	}

	static class Config {
	private final boolean mCanEnableShortcutView;
	private PhoneInfo mPhoneInfo = null;

	Config(@NonNull Context context, PersistableBundle carrierConfig, int entryType) {
	mCanEnableShortcutView = canEnableShortcutView(carrierConfig, entryType);
	refresh(context);
	}

	void refresh(@NonNull Context context) {
	if (mCanEnableShortcutView && !isAirplaneModeOn(context)) {
	mPhoneInfo = ShortcutViewUtils.pickPreferredPhone(context);
	} else {
	mPhoneInfo = null;
	}
	}

	boolean isEnabled() {
	return mPhoneInfo != null;
	}

	PhoneInfo getPhoneInfo() {
	return mPhoneInfo;
	}

	String getCountryIso() {
	if (mPhoneInfo == null) {
	return null;
	}
	return mPhoneInfo.getCountryIso();
	}

	boolean hasPromotedEmergencyNumber(String number) {
	if (mPhoneInfo == null) {
	return false;
	}
	return mPhoneInfo.hasPromotedEmergencyNumber(number);
	}

	private boolean canEnableShortcutView(PersistableBundle carrierConfig, int entryType) {
	if (entryType != EmergencyDialer.ENTRY_TYPE_POWER_MENU) {
	Log.d(LOG_TAG, "Disables shortcut view since it's not launched from power menu");
	return false;
	}
	if (carrierConfig == null \|\| !carrierConfig.getBoolean(
	CarrierConfigManager.KEY_SUPPORT_EMERGENCY_DIALER_SHORTCUT_BOOL)) {
	Log.d(LOG_TAG, "Disables shortcut view by carrier requirement");
	return false;
	}
	return true;
	}

	private boolean isAirplaneModeOn(@NonNull Context context) {
	return Settings.Global.getInt(context.getContentResolver(),
	Settings.Global.AIRPLANE_MODE_ON, 0) != 0;
	}
	}

	// Info and emergency call capability of every phone.
	static class PhoneInfo {
	private final PhoneAccountHandle mHandle;
	private final boolean mCanPlaceEmergencyCall;
	private final int mSubId;
	private final String mCountryIso;
	private final List<EmergencyNumber> mPromotedEmergencyNumbers;

	private PhoneInfo(int subId, String countryIso,
	List<EmergencyNumber> promotedEmergencyNumbers) {
	this(null, true, subId, countryIso, promotedEmergencyNumbers);
	}

	private PhoneInfo(PhoneAccountHandle handle, boolean canPlaceEmergencyCall, int subId,
	String countryIso, List<EmergencyNumber> promotedEmergencyNumbers) {
	mHandle = handle;
	mCanPlaceEmergencyCall = canPlaceEmergencyCall;
	mSubId = subId;
	mCountryIso = countryIso;
	mPromotedEmergencyNumbers = promotedEmergencyNumbers;
	}

	public PhoneAccountHandle getPhoneAccountHandle() {
	return mHandle;
	}

	public boolean canPlaceEmergencyCall() {
	return mCanPlaceEmergencyCall;
	}

	public int getSubId() {
	return mSubId;
	}

	public String getCountryIso() {
	return mCountryIso;
	}

	public List<EmergencyNumber> getPromotedEmergencyNumbers() {
	return mPromotedEmergencyNumbers;
	}

	public boolean isSufficientForEmergencyCall(@NonNull Context context) {
	// Checking mCountryIso because the emergency number list is not reliable to be
	// suggested to users if the device didn't camp to any network. In this case, users
	// can still try to dial emergency numbers with dial pad.
	return mCanPlaceEmergencyCall && mPromotedEmergencyNumbers != null
	&& isSupportedCountry(context, mCountryIso);
	}

	public boolean hasPromotedEmergencyNumber(String number) {
	for (EmergencyNumber emergencyNumber : mPromotedEmergencyNumbers) {
	if (emergencyNumber.getNumber().equalsIgnoreCase(number)) {
	return true;
	}
	}
	return false;
	}

	@Override
	public String toString() {
	StringBuilder sb = new StringBuilder();
	sb.append("{");
	if (mHandle != null) {
	sb.append("handle=").append(mHandle.getId()).append(", ");
	}
	sb.append("subId=").append(mSubId)
	.append(", canPlaceEmergencyCall=").append(mCanPlaceEmergencyCall)
	.append(", networkCountryIso=").append(mCountryIso);
	if (mPromotedEmergencyNumbers != null) {
	sb.append(", emergencyNumbers=");
	for (EmergencyNumber emergencyNumber : mPromotedEmergencyNumbers) {
	sb.append(emergencyNumber.getNumber()).append(":")
	.append(emergencyNumber).append(",");
	}
	}
	sb.append("}");
	return sb.toString();
	}
	}

	/**
	* Picks a preferred phone (SIM slot) which is sufficient for emergency call and can provide
	* promoted emergency numbers.
	*
	* A promoted emergency number should be dialed out over the preferred phone. Other emergency
	* numbers should be still dialable over the system default phone.
	*
	* @return A preferred phone and its promoted emergency number, or null if no phone/promoted
	* emergency numbers available.
	*/
	@Nullable
	static PhoneInfo pickPreferredPhone(@NonNull Context context) {
	TelephonyManager telephonyManager = context.getSystemService(TelephonyManager.class);
	if (telephonyManager.getPhoneCount() <= 0) {
	Log.w(LOG_TAG, "No phone available!");
	return null;
	}

	Map<Integer, List<EmergencyNumber>> promotedLists =
	getPromotedEmergencyNumberLists(telephonyManager);
	if (promotedLists == null \|\| promotedLists.isEmpty()) {
	return null;
	}

	// For a multi-phone device, tries the default phone account.
	TelecomManager telecomManager = context.getSystemService(TelecomManager.class);
	PhoneAccountHandle defaultHandle = telecomManager.getDefaultOutgoingPhoneAccount(
	PhoneAccount.SCHEME_TEL);
	if (defaultHandle != null) {
	PhoneInfo phone = loadPhoneInfo(context, defaultHandle, telephonyManager,
	telecomManager, promotedLists);
	if (phone.isSufficientForEmergencyCall(context)) {
	return phone;
	}
	Log.w(LOG_TAG, "Default PhoneAccount is insufficient for emergency call: "
	+ phone.toString());
	} else {
	Log.w(LOG_TAG, "Missing default PhoneAccount! Is this really a phone device?");
	}

	// Looks for any one phone which supports emergency call.
	List<PhoneAccountHandle> allHandles = telecomManager.getCallCapablePhoneAccounts();
	if (allHandles != null && !allHandles.isEmpty()) {
	for (PhoneAccountHandle handle : allHandles) {
	PhoneInfo phone = loadPhoneInfo(context, handle, telephonyManager, telecomManager,
	promotedLists);
	if (phone.isSufficientForEmergencyCall(context)) {
	return phone;
	} else {
	if (Log.isLoggable(LOG_TAG, Log.DEBUG)) {
	Log.d(LOG_TAG, "PhoneAccount " + phone.toString()
	+ " is insufficient for emergency call.");
	}
	}
	}
	}

	Log.w(LOG_TAG, "No PhoneAccount available for emergency call!");
	return null;
	}

	private static boolean isSupportedCountry(@NonNull Context context, String countryIso) {
	if (TextUtils.isEmpty(countryIso)) {
	return false;
	}

	String[] countrysToEnableShortcutView = context.getResources().getStringArray(
	R.array.config_countries_to_enable_shortcut_view);
	for (String supportedCountry : countrysToEnableShortcutView) {
	if (countryIso.equalsIgnoreCase(supportedCountry)) {
	return true;
	}
	}
	return false;
	}

	private static PhoneInfo loadPhoneInfo(
	@NonNull Context context,
	@NonNull PhoneAccountHandle handle,
	@NonNull TelephonyManager telephonyManager,
	@NonNull TelecomManager telecomManager,
	Map<Integer, List<EmergencyNumber>> promotedLists) {
	boolean canPlaceEmergencyCall = false;
	int subId = SubscriptionManager.INVALID_SUBSCRIPTION_ID;
	String countryIso = null;
	List<EmergencyNumber> emergencyNumberList = null;

	PhoneAccount phoneAccount = telecomManager.getPhoneAccount(handle);
	if (phoneAccount != null) {
	canPlaceEmergencyCall = phoneAccount.hasCapabilities(
	PhoneAccount.CAPABILITY_PLACE_EMERGENCY_CALLS);
	subId = telephonyManager.getSubIdForPhoneAccount(phoneAccount);
	}

	TelephonyManager subTelephonyManager = telephonyManager.createForSubscriptionId(subId);
	if (subTelephonyManager != null) {
	countryIso = subTelephonyManager.getNetworkCountryIso();
	}

	if (promotedLists != null) {
	emergencyNumberList = removeCarrierSpecificPrefixes(context, subId,
	promotedLists.get(subId));
	}

	return new PhoneInfo(handle, canPlaceEmergencyCall, subId, countryIso, emergencyNumberList);
	}

	@Nullable
	private static String[] getCarrierSpecificPrefixes(@NonNull Context context, int subId) {
	CarrierConfigManager configMgr = context.getSystemService(CarrierConfigManager.class);
	if (configMgr == null) {
	return null;
	}
	PersistableBundle b = configMgr.getConfigForSubId(subId);
	return b == null ? null : b.getStringArray(
	CarrierConfigManager.KEY_EMERGENCY_NUMBER_PREFIX_STRING_ARRAY);
	}

	// Removes carrier specific emergency number prefixes (if there is any) from every emergency
	// number and create a new list without duplications. Returns the original list if there is no
	// prefixes.
	@NonNull
	private static List<EmergencyNumber> removeCarrierSpecificPrefixes(
	@NonNull Context context,
	int subId,
	@NonNull List<EmergencyNumber> emergencyNumberList) {
	String[] prefixes = getCarrierSpecificPrefixes(context, subId);
	if (ArrayUtils.isEmpty(prefixes)) {
	return emergencyNumberList;
	}

	List<EmergencyNumber> newList = new ArrayList<>(emergencyNumberList.size());
	for (EmergencyNumber emergencyNumber : emergencyNumberList) {
	// If no prefix was removed from emergencyNumber, add it to the newList directly.
	EmergencyNumber newNumber = emergencyNumber;
	String number = emergencyNumber.getNumber();
	for (String prefix : prefixes) {
	// If emergencyNumber starts with this prefix, remove this prefix to retrieve the
	// actual emergency number.
	// However, if emergencyNumber is exactly the same with this prefix, it could be
	// either a real emergency number, or composed with another prefix. It shouldn't be
	// processed with this prefix whatever.
	if (!TextUtils.isEmpty(prefix) && number.startsWith(prefix)
	&& !number.equals(prefix)) {
	newNumber = new EmergencyNumber(
	number.substring(prefix.length()),
	emergencyNumber.getCountryIso(),
	emergencyNumber.getMnc(),
	emergencyNumber.getEmergencyServiceCategoryBitmask(),
	emergencyNumber.getEmergencyUrns(),
	emergencyNumber.getEmergencyNumberSourceBitmask(),
	emergencyNumber.getEmergencyCallRouting());
	// There should not be more than one prefix attached to a number.
	break;
	}
	}
	if (!newList.contains(newNumber)) {
	newList.add(newNumber);
	}
	}
	return newList;
	}

	@NonNull
	private static Map<Integer, List<EmergencyNumber>> getPromotedEmergencyNumberLists(
	@NonNull TelephonyManager telephonyManager) {
	Map<Integer, List<EmergencyNumber>> allLists =
	telephonyManager.getEmergencyNumberList();
	if (allLists == null \|\| allLists.isEmpty()) {
	Log.w(LOG_TAG, "Unable to retrieve emergency number lists!");
	return new ArrayMap<>();
	}

	boolean isDebugLoggable = Log.isLoggable(LOG_TAG, Log.DEBUG);
	Map<Integer, List<EmergencyNumber>> promotedEmergencyNumberLists = new ArrayMap<>();
	for (Map.Entry<Integer, List<EmergencyNumber>> entry : allLists.entrySet()) {
	if (entry.getKey() == null \|\| entry.getValue() == null) {
	continue;
	}
	List<EmergencyNumber> emergencyNumberList = entry.getValue();
	if (isDebugLoggable) {
	Log.d(LOG_TAG, "Emergency numbers of " + entry.getKey());
	}

	// The list of promoted emergency numbers which will be visible on shortcut view.
	List<EmergencyNumber> promotedList = new ArrayList<>();
	// A temporary list for non-prioritized emergency numbers.
	List<EmergencyNumber> tempList = new ArrayList<>();

	for (EmergencyNumber emergencyNumber : emergencyNumberList) {
	boolean isPromotedCategory = (emergencyNumber.getEmergencyServiceCategoryBitmask()
	& PROMOTED_CATEGORIES_BITMASK) != 0;

	// Emergency numbers in DATABASE are prioritized for shortcut view since they were
	// well-categorized.
	boolean isFromPrioritizedSource =
	(emergencyNumber.getEmergencyNumberSourceBitmask()
	& EmergencyNumber.EMERGENCY_NUMBER_SOURCE_DATABASE) != 0;
	if (isDebugLoggable) {
	Log.d(LOG_TAG, " " + emergencyNumber
	+ (isPromotedCategory ? "M" : "")
	+ (isFromPrioritizedSource ? "P" : ""));
	}

	if (isPromotedCategory) {
	if (isFromPrioritizedSource) {
	promotedList.add(emergencyNumber);
	} else {
	tempList.add(emergencyNumber);
	}
	}
	}
	// Puts numbers in temp list after prioritized numbers.
	promotedList.addAll(tempList);

	if (!promotedList.isEmpty()) {
	promotedEmergencyNumberLists.put(entry.getKey(), promotedList);
	}
	}

	if (promotedEmergencyNumberLists.isEmpty()) {
	Log.w(LOG_TAG, "No promoted emergency number found!");
	}
	return promotedEmergencyNumberLists;
	}
	}