Revert "Update AOSP Dialer source from internal google3 repository at cl/158012278. am: 91ce7d2a47"

This reverts commit c67d658e7daa453fe9ad9fd1a37f81eaf2048c44.

Reason for revert: This CL broke the sailfish-userdebug_javac-all target on master.

Change-Id: I9b54333a654c00154ca84f4ece84bea4f07cc19b

5 files changed, 526 insertions, 8 deletions

diff --git a/java/com/android/contacts/common/compat/ContactsCompat.java b/java/com/android/contacts/common/compat/ContactsCompat.java
index e0c9b7e53..39d0b55d3 100644
--- a/java/com/android/contacts/common/compat/ContactsCompat.java
+++ b/java/com/android/contacts/common/compat/ContactsCompat.java
@@ -21,6 +21,7 @@ import android.os.Build.VERSION;
 import android.os.Build.VERSION_CODES;
 import android.provider.ContactsContract;
 import android.provider.ContactsContract.Contacts;
+import com.android.dialer.compat.CompatUtils;
 
 /** Compatibility class for {@link ContactsContract.Contacts} */
 public class ContactsCompat {
@@ -28,6 +29,8 @@ public class ContactsCompat {
   // TODO: Use N APIs
   private static final Uri ENTERPRISE_CONTENT_FILTER_URI =
       Uri.withAppendedPath(Contacts.CONTENT_URI, "filter_enterprise");
+  // Copied from ContactsContract.Contacts#ENTERPRISE_CONTACT_ID_BASE, which is hidden.
+  private static final long ENTERPRISE_CONTACT_ID_BASE = 1000000000;
 
   /** Not instantiable. */
   private ContactsCompat() {}
@@ -38,4 +41,17 @@ public class ContactsCompat {
     }
     return Contacts.CONTENT_FILTER_URI;
   }
+
+  /**
+   * Return {@code true} if a contact ID is from the contacts provider on the enterprise profile.
+   */
+  public static boolean isEnterpriseContactId(long contactId) {
+    if (CompatUtils.isLollipopCompatible()) {
+      return Contacts.isEnterpriseContactId(contactId);
+    } else {
+      // copied from ContactsContract.Contacts.isEnterpriseContactId
+      return (contactId >= ENTERPRISE_CONTACT_ID_BASE)
+          && (contactId < ContactsContract.Profile.MIN_ID);
+    }
+  }
 }
diff --git a/java/com/android/contacts/common/compat/PhoneAccountCompat.java b/java/com/android/contacts/common/compat/PhoneAccountCompat.java
index aa22c6861..6a24ec033 100644
--- a/java/com/android/contacts/common/compat/PhoneAccountCompat.java
+++ b/java/com/android/contacts/common/compat/PhoneAccountCompat.java
@@ -20,10 +20,33 @@ import android.graphics.drawable.Drawable;
 import android.graphics.drawable.Icon;
 import android.support.annotation.Nullable;
 import android.telecom.PhoneAccount;
+import android.util.Log;
+import com.android.dialer.compat.CompatUtils;
 
 /** Compatiblity class for {@link android.telecom.PhoneAccount} */
 public class PhoneAccountCompat {
 
+  private static final String TAG = PhoneAccountCompat.class.getSimpleName();
+
+  /**
+   * Gets the {@link Icon} associated with the given {@link PhoneAccount}
+   *
+   * @param phoneAccount the PhoneAccount from which to retrieve the Icon
+   * @return the Icon, or null
+   */
+  @Nullable
+  public static Icon getIcon(@Nullable PhoneAccount phoneAccount) {
+    if (phoneAccount == null) {
+      return null;
+    }
+
+    if (CompatUtils.isMarshmallowCompatible()) {
+      return phoneAccount.getIcon();
+    }
+
+    return null;
+  }
+
   /**
    * Builds and returns an icon {@code Drawable} to represent this {@code PhoneAccount} in a user
    * interface.
@@ -38,16 +61,44 @@ public class PhoneAccountCompat {
     if (phoneAccount == null || context == null) {
       return null;
     }
-    return createIconDrawableMarshmallow(phoneAccount, context);
+
+    if (CompatUtils.isMarshmallowCompatible()) {
+      return createIconDrawableMarshmallow(phoneAccount, context);
+    }
+
+    if (CompatUtils.isLollipopMr1Compatible()) {
+      return createIconDrawableLollipopMr1(phoneAccount, context);
+    }
+    return null;
   }
 
   @Nullable
   private static Drawable createIconDrawableMarshmallow(
       PhoneAccount phoneAccount, Context context) {
-    Icon accountIcon = phoneAccount.getIcon();
+    Icon accountIcon = getIcon(phoneAccount);
     if (accountIcon == null) {
       return null;
     }
     return accountIcon.loadDrawable(context);
   }
+
+  @Nullable
+  private static Drawable createIconDrawableLollipopMr1(
+      PhoneAccount phoneAccount, Context context) {
+    try {
+      return (Drawable)
+          PhoneAccount.class
+              .getMethod("createIconDrawable", Context.class)
+              .invoke(phoneAccount, context);
+    } catch (ReflectiveOperationException e) {
+      return null;
+    } catch (Throwable t) {
+      Log.e(
+          TAG,
+          "Unexpected exception when attempting to call "
+              + "android.telecom.PhoneAccount#createIconDrawable",
+          t);
+      return null;
+    }
+  }
 }
diff --git a/java/com/android/contacts/common/compat/PhoneNumberUtilsCompat.java b/java/com/android/contacts/common/compat/PhoneNumberUtilsCompat.java
index a6cfe07cd..960b340d8 100644
--- a/java/com/android/contacts/common/compat/PhoneNumberUtilsCompat.java
+++ b/java/com/android/contacts/common/compat/PhoneNumberUtilsCompat.java
@@ -17,7 +17,13 @@
 package com.android.contacts.common.compat;
 
 import android.telephony.PhoneNumberUtils;
+import android.text.Spannable;
+import android.text.TextUtils;
 import android.text.style.TtsSpan;
+import com.android.dialer.compat.CompatUtils;
+import com.google.i18n.phonenumbers.NumberParseException;
+import com.google.i18n.phonenumbers.PhoneNumberUtil;
+import com.google.i18n.phonenumbers.Phonenumber.PhoneNumber;
 
 /**
  * This class contains static utility methods extracted from PhoneNumberUtils, and the methods were
@@ -31,16 +37,138 @@ public class PhoneNumberUtilsCompat {
   /** Not instantiable. */
   private PhoneNumberUtilsCompat() {}
 
+  public static String normalizeNumber(String phoneNumber) {
+    if (CompatUtils.isLollipopCompatible()) {
+      return PhoneNumberUtils.normalizeNumber(phoneNumber);
+    } else {
+      return normalizeNumberInternal(phoneNumber);
+    }
+  }
+
+  /** Implementation copied from {@link PhoneNumberUtils#normalizeNumber} */
+  private static String normalizeNumberInternal(String phoneNumber) {
+    if (TextUtils.isEmpty(phoneNumber)) {
+      return "";
+    }
+    StringBuilder sb = new StringBuilder();
+    int len = phoneNumber.length();
+    for (int i = 0; i < len; i++) {
+      char c = phoneNumber.charAt(i);
+      // Character.digit() supports ASCII and Unicode digits (fullwidth, Arabic-Indic, etc.)
+      int digit = Character.digit(c, 10);
+      if (digit != -1) {
+        sb.append(digit);
+      } else if (sb.length() == 0 && c == '+') {
+        sb.append(c);
+      } else if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')) {
+        return normalizeNumber(PhoneNumberUtils.convertKeypadLettersToDigits(phoneNumber));
+      }
+    }
+    return sb.toString();
+  }
+
   public static String formatNumber(
       String phoneNumber, String phoneNumberE164, String defaultCountryIso) {
+    if (CompatUtils.isLollipopCompatible()) {
       return PhoneNumberUtils.formatNumber(phoneNumber, phoneNumberE164, defaultCountryIso);
+    } else {
+      // This method was deprecated in API level 21, so it's only used on pre-L SDKs.
+      return PhoneNumberUtils.formatNumber(phoneNumber);
+    }
   }
 
   public static CharSequence createTtsSpannable(CharSequence phoneNumber) {
-    return PhoneNumberUtils.createTtsSpannable(phoneNumber);
+    if (CompatUtils.isMarshmallowCompatible()) {
+      return PhoneNumberUtils.createTtsSpannable(phoneNumber);
+    } else {
+      return createTtsSpannableInternal(phoneNumber);
+    }
   }
 
   public static TtsSpan createTtsSpan(String phoneNumber) {
-    return PhoneNumberUtils.createTtsSpan(phoneNumber);
+    if (CompatUtils.isMarshmallowCompatible()) {
+      return PhoneNumberUtils.createTtsSpan(phoneNumber);
+    } else if (CompatUtils.isLollipopCompatible()) {
+      return createTtsSpanLollipop(phoneNumber);
+    } else {
+      return null;
+    }
+  }
+
+  /** Copied from {@link PhoneNumberUtils#createTtsSpannable} */
+  private static CharSequence createTtsSpannableInternal(CharSequence phoneNumber) {
+    if (phoneNumber == null) {
+      return null;
+    }
+    Spannable spannable = Spannable.Factory.getInstance().newSpannable(phoneNumber);
+    addTtsSpanInternal(spannable, 0, spannable.length());
+    return spannable;
+  }
+
+  /** Compat method for addTtsSpan, see {@link PhoneNumberUtils#addTtsSpan} */
+  public static void addTtsSpan(Spannable s, int start, int endExclusive) {
+    if (CompatUtils.isMarshmallowCompatible()) {
+      PhoneNumberUtils.addTtsSpan(s, start, endExclusive);
+    } else {
+      addTtsSpanInternal(s, start, endExclusive);
+    }
+  }
+
+  /** Copied from {@link PhoneNumberUtils#addTtsSpan} */
+  private static void addTtsSpanInternal(Spannable s, int start, int endExclusive) {
+    s.setSpan(
+        createTtsSpan(s.subSequence(start, endExclusive).toString()),
+        start,
+        endExclusive,
+        Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
+  }
+
+  /** Copied from {@link PhoneNumberUtils#createTtsSpan} */
+  private static TtsSpan createTtsSpanLollipop(String phoneNumberString) {
+    if (phoneNumberString == null) {
+      return null;
+    }
+
+    // Parse the phone number
+    final PhoneNumberUtil phoneNumberUtil = PhoneNumberUtil.getInstance();
+    PhoneNumber phoneNumber = null;
+    try {
+      // Don't supply a defaultRegion so this fails for non-international numbers because
+      // we don't want to TalkBalk to read a country code (e.g. +1) if it is not already
+      // present
+      phoneNumber = phoneNumberUtil.parse(phoneNumberString, /* defaultRegion */ null);
+    } catch (NumberParseException ignored) {
+    }
+
+    // Build a telephone tts span
+    final TtsSpan.TelephoneBuilder builder = new TtsSpan.TelephoneBuilder();
+    if (phoneNumber == null) {
+      // Strip separators otherwise TalkBack will be silent
+      // (this behavior was observed with TalkBalk 4.0.2 from their alpha channel)
+      builder.setNumberParts(splitAtNonNumerics(phoneNumberString));
+    } else {
+      if (phoneNumber.hasCountryCode()) {
+        builder.setCountryCode(Integer.toString(phoneNumber.getCountryCode()));
+      }
+      builder.setNumberParts(Long.toString(phoneNumber.getNationalNumber()));
+    }
+    return builder.build();
+  }
+
+  /**
+   * Split a phone number using spaces, ignoring anything that is not a digit
+   *
+   * @param number A {@code CharSequence} before splitting, e.g., "+20(123)-456#"
+   * @return A {@code String} after splitting, e.g., "20 123 456".
+   */
+  private static String splitAtNonNumerics(CharSequence number) {
+    StringBuilder sb = new StringBuilder(number.length());
+    for (int i = 0; i < number.length(); i++) {
+      sb.append(PhoneNumberUtils.isISODigit(number.charAt(i)) ? number.charAt(i) : " ");
+    }
+    // It is very important to remove extra spaces. At time of writing, any leading or trailing
+    // spaces, or any sequence of more than one space, will confuse TalkBack and cause the TTS
+    // span to be non-functional!
+    return sb.toString().replaceAll(" +", " ").trim();
   }
 }
diff --git a/java/com/android/contacts/common/compat/TelephonyManagerCompat.java b/java/com/android/contacts/common/compat/TelephonyManagerCompat.java
index 4a16fb855..7e4803ca5 100644
--- a/java/com/android/contacts/common/compat/TelephonyManagerCompat.java
+++ b/java/com/android/contacts/common/compat/TelephonyManagerCompat.java
@@ -27,6 +27,7 @@ import android.telecom.PhoneAccountHandle;
 import android.telephony.TelephonyManager;
 import com.android.dialer.common.Assert;
 import com.android.dialer.common.LogUtil;
+import com.android.dialer.compat.CompatUtils;
 import java.lang.reflect.InvocationTargetException;
 
 public class TelephonyManagerCompat {
@@ -48,6 +49,31 @@ public class TelephonyManagerCompat {
   private static final String SECRET_CODE_ACTION = "android.provider.Telephony.SECRET_CODE";
 
   /**
+   * @param telephonyManager The telephony manager instance to use for method calls.
+   * @return true if the current device is "voice capable".
+   *     <p>"Voice capable" means that this device supports circuit-switched (i.e. voice) phone
+   *     calls over the telephony network, and is allowed to display the in-call UI while a cellular
+   *     voice call is active. This will be false on "data only" devices which can't make voice
+   *     calls and don't support any in-call UI.
+   *     <p>Note: the meaning of this flag is subtly different from the
+   *     PackageManager.FEATURE_TELEPHONY system feature, which is available on any device with a
+   *     telephony radio, even if the device is data-only.
+   */
+  public static boolean isVoiceCapable(@Nullable TelephonyManager telephonyManager) {
+    if (telephonyManager == null) {
+      return false;
+    }
+    if (CompatUtils.isLollipopMr1Compatible()
+        || CompatUtils.isMethodAvailable(TELEPHONY_MANAGER_CLASS, "isVoiceCapable")) {
+      // isVoiceCapable was unhidden in L-MR1
+      return telephonyManager.isVoiceCapable();
+    }
+    final int phoneType = telephonyManager.getPhoneType();
+    return phoneType == TelephonyManager.PHONE_TYPE_CDMA
+        || phoneType == TelephonyManager.PHONE_TYPE_GSM;
+  }
+
+  /**
    * Returns the number of phones available. Returns 1 for Single standby mode (Single SIM
    * functionality) Returns 2 for Dual standby mode.(Dual SIM functionality)
    *
@@ -59,7 +85,31 @@ public class TelephonyManagerCompat {
     if (telephonyManager == null) {
       return 1;
     }
-    return telephonyManager.getPhoneCount();
+    if (CompatUtils.isMarshmallowCompatible()
+        || CompatUtils.isMethodAvailable(TELEPHONY_MANAGER_CLASS, "getPhoneCount")) {
+      return telephonyManager.getPhoneCount();
+    }
+    return 1;
+  }
+
+  /**
+   * Returns the unique device ID of a subscription, for example, the IMEI for GSM and the MEID for
+   * CDMA phones. Return null if device ID is not available.
+   *
+   * <p>Requires Permission: {@link android.Manifest.permission#READ_PHONE_STATE READ_PHONE_STATE}
+   *
+   * @param telephonyManager The telephony manager instance to use for method calls.
+   * @param slotId of which deviceID is returned
+   */
+  public static String getDeviceId(@Nullable TelephonyManager telephonyManager, int slotId) {
+    if (telephonyManager == null) {
+      return null;
+    }
+    if (CompatUtils.isMarshmallowCompatible()
+        || CompatUtils.isMethodAvailable(TELEPHONY_MANAGER_CLASS, "getDeviceId", Integer.class)) {
+      return telephonyManager.getDeviceId(slotId);
+    }
+    return null;
   }
 
   /**
@@ -69,7 +119,14 @@ public class TelephonyManagerCompat {
    * @return {@code true} if the device supports TTY mode, and {@code false} otherwise.
    */
   public static boolean isTtyModeSupported(@Nullable TelephonyManager telephonyManager) {
-    return telephonyManager != null && telephonyManager.isTtyModeSupported();
+    if (telephonyManager == null) {
+      return false;
+    }
+    if (CompatUtils.isMarshmallowCompatible()
+        || CompatUtils.isMethodAvailable(TELEPHONY_MANAGER_CLASS, "isTtyModeSupported")) {
+      return telephonyManager.isTtyModeSupported();
+    }
+    return false;
   }
 
   /**
@@ -81,7 +138,15 @@ public class TelephonyManagerCompat {
    */
   public static boolean isHearingAidCompatibilitySupported(
       @Nullable TelephonyManager telephonyManager) {
-    return telephonyManager != null && telephonyManager.isHearingAidCompatibilitySupported();
+    if (telephonyManager == null) {
+      return false;
+    }
+    if (CompatUtils.isMarshmallowCompatible()
+        || CompatUtils.isMethodAvailable(
+            TELEPHONY_MANAGER_CLASS, "isHearingAidCompatibilitySupported")) {
+      return telephonyManager.isHearingAidCompatibilitySupported();
+    }
+    return false;
   }
 
   /**
diff --git a/java/com/android/contacts/common/compat/telecom/TelecomManagerCompat.java b/java/com/android/contacts/common/compat/telecom/TelecomManagerCompat.java
index 43eae589d..5687f6fbf 100644
--- a/java/com/android/contacts/common/compat/telecom/TelecomManagerCompat.java
+++ b/java/com/android/contacts/common/compat/telecom/TelecomManagerCompat.java
@@ -15,19 +15,275 @@
  */
 package com.android.contacts.common.compat.telecom;
 
+import android.app.Activity;
+import android.content.Intent;
+import android.net.Uri;
 import android.support.annotation.Nullable;
+import android.telecom.PhoneAccount;
 import android.telecom.PhoneAccountHandle;
 import android.telecom.TelecomManager;
+import android.telephony.PhoneNumberUtils;
+import android.telephony.TelephonyManager;
+import android.text.TextUtils;
+import com.android.dialer.compat.CompatUtils;
+import java.util.ArrayList;
+import java.util.List;
 
 /** Compatibility class for {@link android.telecom.TelecomManager}. */
 public class TelecomManagerCompat {
 
+  public static final String TELECOM_MANAGER_CLASS = "android.telecom.TelecomManager";
+
   // TODO: remove once this is available in android.telecom.Call
   // b/33779976
   public static final String EXTRA_LAST_EMERGENCY_CALLBACK_TIME_MILLIS =
       "android.telecom.extra.LAST_EMERGENCY_CALLBACK_TIME_MILLIS";
 
   /**
+   * Places a new outgoing call to the provided address using the system telecom service with the
+   * specified intent.
+   *
+   * @param activity {@link Activity} used to start another activity for the given intent
+   * @param telecomManager the {@link TelecomManager} used to place a call, if possible
+   * @param intent the intent for the call
+   */
+  public static void placeCall(
+      @Nullable Activity activity,
+      @Nullable TelecomManager telecomManager,
+      @Nullable Intent intent) {
+    if (activity == null || telecomManager == null || intent == null) {
+      return;
+    }
+    if (CompatUtils.isMarshmallowCompatible()) {
+      telecomManager.placeCall(intent.getData(), intent.getExtras());
+      return;
+    }
+    activity.startActivityForResult(intent, 0);
+  }
+
+  /**
+   * Get the URI for running an adn query.
+   *
+   * @param telecomManager the {@link TelecomManager} used for method calls, if possible.
+   * @param accountHandle The handle for the account to derive an adn query URI for or {@code null}
+   *     to return a URI which will use the default account.
+   * @return The URI (with the content:// scheme) specific to the specified {@link PhoneAccount} for
+   *     the the content retrieve.
+   */
+  public static Uri getAdnUriForPhoneAccount(
+      @Nullable TelecomManager telecomManager, PhoneAccountHandle accountHandle) {
+    if (telecomManager != null
+        && (CompatUtils.isMarshmallowCompatible()
+            || CompatUtils.isMethodAvailable(
+                TELECOM_MANAGER_CLASS, "getAdnUriForPhoneAccount", PhoneAccountHandle.class))) {
+      return telecomManager.getAdnUriForPhoneAccount(accountHandle);
+    }
+    return Uri.parse("content://icc/adn");
+  }
+
+  /**
+   * Returns a list of {@link PhoneAccountHandle}s which can be used to make and receive phone
+   * calls. The returned list includes only those accounts which have been explicitly enabled by the
+   * user.
+   *
+   * @param telecomManager the {@link TelecomManager} used for method calls, if possible.
+   * @return A list of PhoneAccountHandle objects.
+   */
+  public static List<PhoneAccountHandle> getCallCapablePhoneAccounts(
+      @Nullable TelecomManager telecomManager) {
+    if (telecomManager != null
+        && (CompatUtils.isMarshmallowCompatible()
+            || CompatUtils.isMethodAvailable(
+                TELECOM_MANAGER_CLASS, "getCallCapablePhoneAccounts"))) {
+      return telecomManager.getCallCapablePhoneAccounts();
+    }
+    return new ArrayList<>();
+  }
+
+  /**
+   * Used to determine the currently selected default dialer package.
+   *
+   * @param telecomManager the {@link TelecomManager} used for method calls, if possible.
+   * @return package name for the default dialer package or null if no package has been selected as
+   *     the default dialer.
+   */
+  @Nullable
+  public static String getDefaultDialerPackage(@Nullable TelecomManager telecomManager) {
+    if (telecomManager != null && CompatUtils.isDefaultDialerCompatible()) {
+      return telecomManager.getDefaultDialerPackage();
+    }
+    return null;
+  }
+
+  /**
+   * Return the {@link PhoneAccount} which will be used to place outgoing calls to addresses with
+   * the specified {@code uriScheme}. This PhoneAccount will always be a member of the list which is
+   * returned from invoking {@link TelecomManager#getCallCapablePhoneAccounts()}. The specific
+   * account returned depends on the following priorities:
+   *
+   * <p>1. If the user-selected default PhoneAccount supports the specified scheme, it will be
+   * returned. 2. If there exists only one PhoneAccount that supports the specified scheme, it will
+   * be returned.
+   *
+   * <p>If no PhoneAccount fits the criteria above, this method will return {@code null}.
+   *
+   * @param telecomManager the {@link TelecomManager} used for method calls, if possible.
+   * @param uriScheme The URI scheme.
+   * @return The {@link PhoneAccountHandle} corresponding to the account to be used.
+   */
+  @Nullable
+  public static PhoneAccountHandle getDefaultOutgoingPhoneAccount(
+      @Nullable TelecomManager telecomManager, @Nullable String uriScheme) {
+    if (telecomManager != null
+        && (CompatUtils.isMarshmallowCompatible()
+            || CompatUtils.isMethodAvailable(
+                TELECOM_MANAGER_CLASS, "getDefaultOutgoingPhoneAccount", String.class))) {
+      return telecomManager.getDefaultOutgoingPhoneAccount(uriScheme);
+    }
+    return null;
+  }
+
+  /**
+   * Return the line 1 phone number for given phone account.
+   *
+   * @param telecomManager the {@link TelecomManager} to use in the event that {@link
+   *     TelecomManager#getLine1Number(PhoneAccountHandle)} is available
+   * @param telephonyManager the {@link TelephonyManager} to use if TelecomManager#getLine1Number is
+   *     unavailable
+   * @param phoneAccountHandle the phoneAccountHandle upon which to check the line one number
+   * @return the line one number
+   */
+  @Nullable
+  public static String getLine1Number(
+      @Nullable TelecomManager telecomManager,
+      @Nullable TelephonyManager telephonyManager,
+      @Nullable PhoneAccountHandle phoneAccountHandle) {
+    if (telecomManager != null && CompatUtils.isMarshmallowCompatible()) {
+      return telecomManager.getLine1Number(phoneAccountHandle);
+    }
+    if (telephonyManager != null) {
+      return telephonyManager.getLine1Number();
+    }
+    return null;
+  }
+
+  /**
+   * Return whether a given phone number is the configured voicemail number for a particular phone
+   * account.
+   *
+   * @param telecomManager the {@link TelecomManager} to use for checking the number.
+   * @param accountHandle The handle for the account to check the voicemail number against
+   * @param number The number to look up.
+   */
+  public static boolean isVoiceMailNumber(
+      @Nullable TelecomManager telecomManager,
+      @Nullable PhoneAccountHandle accountHandle,
+      @Nullable String number) {
+    if (telecomManager != null
+        && (CompatUtils.isMarshmallowCompatible()
+            || CompatUtils.isMethodAvailable(
+                TELECOM_MANAGER_CLASS,
+                "isVoiceMailNumber",
+                PhoneAccountHandle.class,
+                String.class))) {
+      return telecomManager.isVoiceMailNumber(accountHandle, number);
+    }
+    return PhoneNumberUtils.isVoiceMailNumber(number);
+  }
+
+  /**
+   * Return the {@link PhoneAccount} for a specified {@link PhoneAccountHandle}. Object includes
+   * resources which can be used in a user interface.
+   *
+   * @param telecomManager the {@link TelecomManager} used for method calls, if possible.
+   * @param account The {@link PhoneAccountHandle}.
+   * @return The {@link PhoneAccount} object or null if it doesn't exist.
+   */
+  @Nullable
+  public static PhoneAccount getPhoneAccount(
+      @Nullable TelecomManager telecomManager, @Nullable PhoneAccountHandle accountHandle) {
+    if (telecomManager != null
+        && (CompatUtils.isMethodAvailable(
+            TELECOM_MANAGER_CLASS, "getPhoneAccount", PhoneAccountHandle.class))) {
+      return telecomManager.getPhoneAccount(accountHandle);
+    }
+    return null;
+  }
+
+  /**
+   * Return the voicemail number for a given phone account.
+   *
+   * @param telecomManager The {@link TelecomManager} object to use for retrieving the voicemail
+   *     number if accountHandle is specified.
+   * @param telephonyManager The {@link TelephonyManager} object to use for retrieving the voicemail
+   *     number if accountHandle is null.
+   * @param accountHandle The handle for the phone account.
+   * @return The voicemail number for the phone account, and {@code null} if one has not been
+   *     configured.
+   */
+  @Nullable
+  public static String getVoiceMailNumber(
+      @Nullable TelecomManager telecomManager,
+      @Nullable TelephonyManager telephonyManager,
+      @Nullable PhoneAccountHandle accountHandle) {
+    if (telecomManager != null
+        && (CompatUtils.isMethodAvailable(
+            TELECOM_MANAGER_CLASS, "getVoiceMailNumber", PhoneAccountHandle.class))) {
+      return telecomManager.getVoiceMailNumber(accountHandle);
+    } else if (telephonyManager != null) {
+      return telephonyManager.getVoiceMailNumber();
+    }
+    return null;
+  }
+
+  /**
+   * Processes the specified dial string as an MMI code. MMI codes are any sequence of characters
+   * entered into the dialpad that contain a "*" or "#". Some of these sequences launch special
+   * behavior through handled by Telephony.
+   *
+   * @param telecomManager The {@link TelecomManager} object to use for handling MMI.
+   * @param dialString The digits to dial.
+   * @return {@code true} if the digits were processed as an MMI code, {@code false} otherwise.
+   */
+  public static boolean handleMmi(
+      @Nullable TelecomManager telecomManager,
+      @Nullable String dialString,
+      @Nullable PhoneAccountHandle accountHandle) {
+    if (telecomManager == null || TextUtils.isEmpty(dialString)) {
+      return false;
+    }
+    if (CompatUtils.isMarshmallowCompatible()) {
+      return telecomManager.handleMmi(dialString, accountHandle);
+    }
+
+    Object handleMmiResult =
+        CompatUtils.invokeMethod(
+            telecomManager,
+            "handleMmi",
+            new Class<?>[] {PhoneAccountHandle.class, String.class},
+            new Object[] {accountHandle, dialString});
+    if (handleMmiResult != null) {
+      return (boolean) handleMmiResult;
+    }
+
+    return telecomManager.handleMmi(dialString);
+  }
+
+  /**
+   * Silences the ringer if a ringing call exists. Noop if {@link TelecomManager#silenceRinger()} is
+   * unavailable.
+   *
+   * @param telecomManager the TelecomManager to use to silence the ringer.
+   */
+  public static void silenceRinger(@Nullable TelecomManager telecomManager) {
+    if (telecomManager != null
+        && (CompatUtils.isMarshmallowCompatible()
+            || CompatUtils.isMethodAvailable(TELECOM_MANAGER_CLASS, "silenceRinger"))) {
+      telecomManager.silenceRinger();
+    }
+  }
+
+  /**
    * Returns the current SIM call manager. Apps must be prepared for this method to return null,
    * indicating that there currently exists no registered SIM call manager.
    *
@@ -36,7 +292,9 @@ public class TelecomManagerCompat {
    */
   @Nullable
   public static PhoneAccountHandle getSimCallManager(TelecomManager telecomManager) {
-    if (telecomManager != null) {
+    if (telecomManager != null
+        && (CompatUtils.isMarshmallowCompatible()
+            || CompatUtils.isMethodAvailable(TELECOM_MANAGER_CLASS, "getSimCallManager"))) {
       return telecomManager.getSimCallManager();
     }
     return null;