Added telephony display info support

Added the new APIs allowing clients like System UI to display
network icons correctly based on the provided telephony display
info.

Test: Telephony sanity tests
Bug: 148540139
Change-Id: I4dfb6eb7a313539e0565a4239d555426f12e503e

11 files changed, 343 insertions, 1 deletions

diff --git a/api/current.txt b/api/current.txt
index 475506a317bc..71866f575f01 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -47051,6 +47051,19 @@ package android.telephony {
     field @NonNull public static final android.os.Parcelable.Creator<android.telephony.ClosedSubscriberGroupInfo> CREATOR;
   }
 
+  public final class DisplayInfo implements android.os.Parcelable {
+    method public int describeContents();
+    method public int getNetworkType();
+    method public int getOverrideNetworkType();
+    method public void writeToParcel(@NonNull android.os.Parcel, int);
+    field @NonNull public static final android.os.Parcelable.Creator<android.telephony.DisplayInfo> CREATOR;
+    field public static final int OVERRIDE_NETWORK_TYPE_LTE_ADVANCED_PRO = 2; // 0x2
+    field public static final int OVERRIDE_NETWORK_TYPE_LTE_CA = 1; // 0x1
+    field public static final int OVERRIDE_NETWORK_TYPE_NONE = 0; // 0x0
+    field public static final int OVERRIDE_NETWORK_TYPE_NR_NSA = 3; // 0x3
+    field public static final int OVERRIDE_NETWORK_TYPE_NR_NSA_MMWAVE = 4; // 0x4
+  }
+
   public class IccOpenLogicalChannelResponse implements android.os.Parcelable {
     method public int describeContents();
     method public int getChannel();
@@ -47307,6 +47320,7 @@ package android.telephony {
     method public void onDataActivity(int);
     method public void onDataConnectionStateChanged(int);
     method public void onDataConnectionStateChanged(int, int);
+    method @RequiresPermission("android.permission.READ_PHONE_STATE") public void onDisplayInfoChanged(@NonNull android.telephony.DisplayInfo);
     method @RequiresPermission("android.permission.READ_PRECISE_PHONE_STATE") public void onImsCallDisconnectCauseChanged(@NonNull android.telephony.ims.ImsReasonInfo);
     method public void onMessageWaitingIndicatorChanged(boolean);
     method @RequiresPermission("android.permission.MODIFY_PHONE_STATE") public void onPreciseDataConnectionStateChanged(@NonNull android.telephony.PreciseDataConnectionState);
@@ -47324,6 +47338,7 @@ package android.telephony {
     field public static final int LISTEN_CELL_LOCATION = 16; // 0x10
     field public static final int LISTEN_DATA_ACTIVITY = 128; // 0x80
     field public static final int LISTEN_DATA_CONNECTION_STATE = 64; // 0x40
+    field public static final int LISTEN_DISPLAY_INFO_CHANGED = 1048576; // 0x100000
     field public static final int LISTEN_EMERGENCY_NUMBER_LIST = 16777216; // 0x1000000
     field @RequiresPermission("android.permission.READ_PRECISE_PHONE_STATE") public static final int LISTEN_IMS_CALL_DISCONNECT_CAUSES = 134217728; // 0x8000000
     field public static final int LISTEN_MESSAGE_WAITING_INDICATOR = 4; // 0x4
diff --git a/api/system-current.txt b/api/system-current.txt
index 97b31516f7c0..666dd92b74b3 100755
--- a/api/system-current.txt
+++ b/api/system-current.txt
@@ -12584,6 +12584,7 @@ package android.telephony {
     method public void notifyDataActivityChanged(int, int);
     method public void notifyDataConnectionForSubscriber(int, int, int, @Nullable android.telephony.PreciseDataConnectionState);
     method public void notifyDisconnectCause(int, int, int, int);
+    method public void notifyDisplayInfoChanged(int, int, @NonNull android.telephony.DisplayInfo);
     method public void notifyEmergencyNumberList(int, int);
     method public void notifyImsDisconnectCause(int, @NonNull android.telephony.ims.ImsReasonInfo);
     method public void notifyMessageWaitingChanged(int, int, boolean);
diff --git a/api/test-current.txt b/api/test-current.txt
index 8598c167cab0..b2b4fcf6bcf8 100644
--- a/api/test-current.txt
+++ b/api/test-current.txt
@@ -3709,6 +3709,7 @@ package android.telephony {
     method public void notifyDataActivityChanged(int, int);
     method public void notifyDataConnectionForSubscriber(int, int, int, @Nullable android.telephony.PreciseDataConnectionState);
     method public void notifyDisconnectCause(int, int, int, int);
+    method public void notifyDisplayInfoChanged(int, int, @NonNull android.telephony.DisplayInfo);
     method public void notifyEmergencyNumberList(int, int);
     method public void notifyImsDisconnectCause(int, @NonNull android.telephony.ims.ImsReasonInfo);
     method public void notifyMessageWaitingChanged(int, int, boolean);
diff --git a/core/java/android/telephony/PhoneStateListener.java b/core/java/android/telephony/PhoneStateListener.java
index e65bd9f20ec4..d2735008611c 100644
--- a/core/java/android/telephony/PhoneStateListener.java
+++ b/core/java/android/telephony/PhoneStateListener.java
@@ -301,6 +301,13 @@ public class PhoneStateListener {
     public static final int LISTEN_USER_MOBILE_DATA_STATE                  = 0x00080000;
 
     /**
+     *  Listen for display info changed event.
+     *
+     *  @see #onDisplayInfoChanged
+     */
+    public static final int LISTEN_DISPLAY_INFO_CHANGED = 0x00100000;
+
+    /**
      *  Listen for changes to the phone capability.
      *
      *  @see #onPhoneCapabilityChanged
@@ -848,6 +855,21 @@ public class PhoneStateListener {
     }
 
     /**
+     * Callback invoked when the display info has changed on the registered subscription.
+     * <p> The {@link DisplayInfo} contains status information shown to the user based on
+     * carrier policy.
+     *
+     * Requires Permission: {@link android.Manifest.permission#READ_PHONE_STATE} or that the calling
+     * app has carrier privileges (see {@link TelephonyManager#hasCarrierPrivileges}).
+     *
+     * @param displayInfo The display information.
+     */
+    @RequiresPermission((android.Manifest.permission.READ_PHONE_STATE))
+    public void onDisplayInfoChanged(@NonNull DisplayInfo displayInfo) {
+        // default implementation empty
+    }
+
+    /**
      * Callback invoked when the current emergency number list has changed on the registered
      * subscription.
      * Note, the registration subId comes from {@link TelephonyManager} object which registers
@@ -1226,6 +1248,15 @@ public class PhoneStateListener {
                             () -> psl.onUserMobileDataStateChanged(enabled)));
         }
 
+        public void onDisplayInfoChanged(DisplayInfo displayInfo) {
+            PhoneStateListener psl = mPhoneStateListenerWeakRef.get();
+            if (psl == null) return;
+
+            Binder.withCleanCallingIdentity(
+                    () -> mExecutor.execute(
+                            () -> psl.onDisplayInfoChanged(displayInfo)));
+        }
+
         public void onOemHookRawEvent(byte[] rawData) {
             PhoneStateListener psl = mPhoneStateListenerWeakRef.get();
             if (psl == null) return;
diff --git a/core/java/android/telephony/TelephonyRegistryManager.java b/core/java/android/telephony/TelephonyRegistryManager.java
index 4024db1e16c4..2c077bbdc772 100644
--- a/core/java/android/telephony/TelephonyRegistryManager.java
+++ b/core/java/android/telephony/TelephonyRegistryManager.java
@@ -589,6 +589,24 @@ public class TelephonyRegistryManager {
     }
 
     /**
+     * Notify display info changed.
+     *
+     * @param slotIndex The SIM slot index for which display info has changed. Can be
+     * derived from {@code subscriptionId} except when {@code subscriptionId} is invalid, such as
+     * when the device is in emergency-only mode.
+     * @param subscriptionId Subscription id for which display network info has changed.
+     * @param displayInfo The display info.
+     */
+    public void notifyDisplayInfoChanged(int slotIndex, int subscriptionId,
+                                         @NonNull DisplayInfo displayInfo) {
+        try {
+            sRegistry.notifyDisplayInfoChanged(slotIndex, subscriptionId, displayInfo);
+        } catch (RemoteException ex) {
+            // system process is dead
+        }
+    }
+
+    /**
      * Notify IMS call disconnect causes which contains {@link android.telephony.ims.ImsReasonInfo}.
      *
      * @param subId for which ims call disconnect.
diff --git a/core/java/com/android/internal/telephony/IPhoneStateListener.aidl b/core/java/com/android/internal/telephony/IPhoneStateListener.aidl
index 0f50596f935d..3d5dfbbb871a 100644
--- a/core/java/com/android/internal/telephony/IPhoneStateListener.aidl
+++ b/core/java/com/android/internal/telephony/IPhoneStateListener.aidl
@@ -21,6 +21,7 @@ import android.telephony.CallAttributes;
 import android.telephony.CellIdentity;
 import android.telephony.CellInfo;
 import android.telephony.DataConnectionRealTimeInfo;
+import android.telephony.DisplayInfo;
 import android.telephony.PhoneCapability;
 import android.telephony.PreciseCallState;
 import android.telephony.PreciseDataConnectionState;
@@ -54,6 +55,7 @@ oneway interface IPhoneStateListener {
     void onOemHookRawEvent(in byte[] rawData);
     void onCarrierNetworkChange(in boolean active);
     void onUserMobileDataStateChanged(in boolean enabled);
+    void onDisplayInfoChanged(in DisplayInfo displayInfo);
     void onPhoneCapabilityChanged(in PhoneCapability capability);
     void onActiveDataSubIdChanged(in int subId);
     void onRadioPowerStateChanged(in int state);
diff --git a/core/java/com/android/internal/telephony/ITelephonyRegistry.aidl b/core/java/com/android/internal/telephony/ITelephonyRegistry.aidl
index 47752c5b2d94..520ffc9584e2 100644
--- a/core/java/com/android/internal/telephony/ITelephonyRegistry.aidl
+++ b/core/java/com/android/internal/telephony/ITelephonyRegistry.aidl
@@ -23,6 +23,7 @@ import android.telephony.BarringInfo;
 import android.telephony.CallQuality;
 import android.telephony.CellIdentity;
 import android.telephony.CellInfo;
+import android.telephony.DisplayInfo;
 import android.telephony.ims.ImsReasonInfo;
 import android.telephony.PhoneCapability;
 import android.telephony.PhysicalChannelConfig;
@@ -87,6 +88,7 @@ interface ITelephonyRegistry {
     void notifyOpportunisticSubscriptionInfoChanged();
     void notifyCarrierNetworkChange(in boolean active);
     void notifyUserMobileDataStateChangedForPhoneId(in int phoneId, in int subId, in boolean state);
+    void notifyDisplayInfoChanged(int slotIndex, int subId, in DisplayInfo displayInfo);
     void notifyPhoneCapabilityChanged(in PhoneCapability capability);
     void notifyActiveDataSubIdChanged(int activeDataSubId);
     void notifyRadioPowerStateChanged(in int phoneId, in int subId, in int state);
diff --git a/services/core/java/com/android/server/TelephonyRegistry.java b/services/core/java/com/android/server/TelephonyRegistry.java
index 0e5a6bb8bd1c..f85fc284330c 100644
--- a/services/core/java/com/android/server/TelephonyRegistry.java
+++ b/services/core/java/com/android/server/TelephonyRegistry.java
@@ -61,6 +61,7 @@ import android.telephony.CellSignalStrengthTdscdma;
 import android.telephony.CellSignalStrengthWcdma;
 import android.telephony.DataFailCause;
 import android.telephony.DisconnectCause;
+import android.telephony.DisplayInfo;
 import android.telephony.LocationAccessPolicy;
 import android.telephony.PhoneCapability;
 import android.telephony.PhoneStateListener;
@@ -205,6 +206,8 @@ public class TelephonyRegistry extends ITelephonyRegistry.Stub {
 
     private boolean[] mUserMobileDataState;
 
+    private DisplayInfo[] mDisplayInfos;
+
     private SignalStrength[] mSignalStrength;
 
     private boolean[] mMessageWaiting;
@@ -284,7 +287,8 @@ public class TelephonyRegistry extends ITelephonyRegistry.Stub {
     static final int ENFORCE_PHONE_STATE_PERMISSION_MASK =
                 PhoneStateListener.LISTEN_CALL_FORWARDING_INDICATOR
                         | PhoneStateListener.LISTEN_MESSAGE_WAITING_INDICATOR
-                        | PhoneStateListener.LISTEN_EMERGENCY_NUMBER_LIST;
+                        | PhoneStateListener.LISTEN_EMERGENCY_NUMBER_LIST
+                        | PhoneStateListener.LISTEN_DISPLAY_INFO_CHANGED;
 
     static final int ENFORCE_PRECISE_PHONE_STATE_PERMISSION_MASK =
                 PhoneStateListener.LISTEN_PRECISE_CALL_STATE
@@ -443,6 +447,7 @@ public class TelephonyRegistry extends ITelephonyRegistry.Stub {
         mCallAttributes = copyOf(mCallAttributes, mNumPhones);
         mOutgoingCallEmergencyNumber = copyOf(mOutgoingCallEmergencyNumber, mNumPhones);
         mOutgoingSmsEmergencyNumber = copyOf(mOutgoingSmsEmergencyNumber, mNumPhones);
+        mDisplayInfos = copyOf(mDisplayInfos, mNumPhones);
 
         // ds -> ss switch.
         if (mNumPhones < oldNumPhones) {
@@ -482,6 +487,7 @@ public class TelephonyRegistry extends ITelephonyRegistry.Stub {
             mBackgroundCallState[i] = PreciseCallState.PRECISE_CALL_STATE_IDLE;
             mPreciseDataConnectionStates.add(new HashMap<Integer, PreciseDataConnectionState>());
             mBarringInfo.add(i, new BarringInfo());
+            mDisplayInfos[i] = null;
         }
     }
 
@@ -540,6 +546,7 @@ public class TelephonyRegistry extends ITelephonyRegistry.Stub {
         mOutgoingCallEmergencyNumber = new EmergencyNumber[numPhones];
         mOutgoingSmsEmergencyNumber = new EmergencyNumber[numPhones];
         mBarringInfo = new ArrayList<>();
+        mDisplayInfos = new DisplayInfo[numPhones];
         for (int i = 0; i < numPhones; i++) {
             mCallState[i] =  TelephonyManager.CALL_STATE_IDLE;
             mDataActivity[i] = TelephonyManager.DATA_ACTIVITY_NONE;
@@ -568,6 +575,7 @@ public class TelephonyRegistry extends ITelephonyRegistry.Stub {
             mBackgroundCallState[i] = PreciseCallState.PRECISE_CALL_STATE_IDLE;
             mPreciseDataConnectionStates.add(new HashMap<Integer, PreciseDataConnectionState>());
             mBarringInfo.add(i, new BarringInfo());
+            mDisplayInfos[i] = null;
         }
 
         mAppOps = mContext.getSystemService(AppOpsManager.class);
@@ -978,6 +986,15 @@ public class TelephonyRegistry extends ITelephonyRegistry.Stub {
                             remove(r.binder);
                         }
                     }
+                    if ((events & PhoneStateListener.LISTEN_DISPLAY_INFO_CHANGED) != 0) {
+                        try {
+                            if (mDisplayInfos[phoneId] != null) {
+                                r.callback.onDisplayInfoChanged(mDisplayInfos[phoneId]);
+                            }
+                        } catch (RemoteException ex) {
+                            remove(r.binder);
+                        }
+                    }
                     if ((events & PhoneStateListener.LISTEN_EMERGENCY_NUMBER_LIST) != 0) {
                         try {
                             r.callback.onEmergencyNumberListChanged(mEmergencyNumberList);
@@ -1501,6 +1518,45 @@ public class TelephonyRegistry extends ITelephonyRegistry.Stub {
         }
     }
 
+    /**
+     * Notify display network info changed.
+     *
+     * @param phoneId Phone id
+     * @param subId Subscription id
+     * @param displayInfo Display network info
+     *
+     * @see PhoneStateListener#onDisplayInfoChanged(DisplayInfo)
+     */
+    public void notifyDisplayInfoChanged(int phoneId, int subId,
+                                         @NonNull DisplayInfo displayInfo) {
+        if (!checkNotifyPermission("notifyDisplayInfoChanged()")) {
+            return;
+        }
+        if (VDBG) {
+            log("notifyDisplayInfoChanged: PhoneId=" + phoneId
+                    + " subId=" + subId + " displayInfo=" + displayInfo);
+        }
+        synchronized (mRecords) {
+            if (validatePhoneId(phoneId)) {
+                if (mDisplayInfos[phoneId] != null) {
+                    mDisplayInfos[phoneId] = displayInfo;
+                    for (Record r : mRecords) {
+                        if (r.matchPhoneStateListenerEvent(
+                                PhoneStateListener.LISTEN_DISPLAY_INFO_CHANGED)
+                                && idMatch(r.subId, subId, phoneId)) {
+                            try {
+                                r.callback.onDisplayInfoChanged(displayInfo);
+                            } catch (RemoteException ex) {
+                                mRemoveList.add(r.binder);
+                            }
+                        }
+                    }
+                }
+            }
+            handleRemoveListLocked();
+        }
+    }
+
     public void notifyCallForwardingChanged(boolean cfi) {
         notifyCallForwardingChangedForSubscriber(SubscriptionManager.DEFAULT_SUBSCRIPTION_ID, cfi);
     }
@@ -2730,6 +2786,20 @@ public class TelephonyRegistry extends ITelephonyRegistry.Stub {
             }
         }
 
+        if ((events & PhoneStateListener.LISTEN_DISPLAY_INFO_CHANGED) != 0) {
+            try {
+                if (VDBG) {
+                    log("checkPossibleMissNotify: onDisplayInfoChanged phoneId="
+                            + phoneId + " dpi=" + mDisplayInfos[phoneId]);
+                }
+                if (mDisplayInfos[phoneId] != null) {
+                    r.callback.onDisplayInfoChanged(mDisplayInfos[phoneId]);
+                }
+            } catch (RemoteException ex) {
+                mRemoveList.add(r.binder);
+            }
+        }
+
         if ((events & PhoneStateListener.LISTEN_MESSAGE_WAITING_INDICATOR) != 0) {
             try {
                 if (VDBG) {
diff --git a/telephony/java/android/telephony/Annotation.java b/telephony/java/android/telephony/Annotation.java
index d2a5905f7a99..a27c4802c306 100644
--- a/telephony/java/android/telephony/Annotation.java
+++ b/telephony/java/android/telephony/Annotation.java
@@ -661,4 +661,16 @@ public class Annotation {
     })
     @Retention(RetentionPolicy.SOURCE)
     public @interface Skip464XlatStatus {}
+
+    /**
+     * Override network type
+     */
+    @Retention(RetentionPolicy.SOURCE)
+    @IntDef(prefix = "OVERRIDE_NETWORK_TYPE_", value = {
+            DisplayInfo.OVERRIDE_NETWORK_TYPE_NONE,
+            DisplayInfo.OVERRIDE_NETWORK_TYPE_LTE_CA,
+            DisplayInfo.OVERRIDE_NETWORK_TYPE_LTE_ADVANCED_PRO,
+            DisplayInfo.OVERRIDE_NETWORK_TYPE_NR_NSA,
+            DisplayInfo.OVERRIDE_NETWORK_TYPE_NR_NSA_MMWAVE})
+    public @interface OverrideNetworkType {}
 }
diff --git a/telephony/java/android/telephony/DisplayInfo.aidl b/telephony/java/android/telephony/DisplayInfo.aidl
new file mode 100644
index 000000000000..861b0fe04848
--- /dev/null
+++ b/telephony/java/android/telephony/DisplayInfo.aidl
@@ -0,0 +1,18 @@
+/*
+ * Copyright (C) 2020 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 android.telephony;
+
+parcelable DisplayInfo;
diff --git a/telephony/java/android/telephony/DisplayInfo.java b/telephony/java/android/telephony/DisplayInfo.java
new file mode 100644
index 000000000000..d54bcf931c33
--- /dev/null
+++ b/telephony/java/android/telephony/DisplayInfo.java
@@ -0,0 +1,172 @@
+/*
+ * Copyright 2020 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 android.telephony;
+
+import android.annotation.NonNull;
+import android.os.Parcel;
+import android.os.Parcelable;
+import android.telephony.Annotation.NetworkType;
+import android.telephony.Annotation.OverrideNetworkType;
+
+import java.util.Objects;
+
+/**
+ * DisplayInfo contains telephony-related information used for display purposes only. This
+ * information is provided in accordance with carrier policy and branding preferences; it is not
+ * necessarily a precise or accurate representation of the current state and should be treated
+ * accordingly.
+ */
+public final class DisplayInfo implements Parcelable {
+    /**
+     * No override. {@link #getNetworkType()} should be used for display network
+     * type.
+     */
+    public static final int OVERRIDE_NETWORK_TYPE_NONE = 0;
+
+    /**
+     * Override network type when the device is connected to
+     * {@link TelephonyManager#NETWORK_TYPE_LTE} cellular network and is using carrier aggregation.
+     */
+    public static final int OVERRIDE_NETWORK_TYPE_LTE_CA = 1;
+
+    /**
+     * Override network type when the device is connected to advanced pro
+     * {@link TelephonyManager#NETWORK_TYPE_LTE} cellular network.
+     */
+    public static final int OVERRIDE_NETWORK_TYPE_LTE_ADVANCED_PRO = 2;
+
+    /**
+     * Override network type when the device is connected to
+     * {@link TelephonyManager#NETWORK_TYPE_LTE} network and has E-UTRA-NR Dual Connectivity(EN-DC)
+     * capability or is currently connected to the secondary
+     * {@link TelephonyManager#NETWORK_TYPE_NR} cellular network.
+     */
+    public static final int OVERRIDE_NETWORK_TYPE_NR_NSA = 3;
+
+    /**
+     * Override network type when the device is connected to
+     * {@link TelephonyManager#NETWORK_TYPE_LTE} network and has E-UTRA-NR Dual Connectivity(EN-DC)
+     * capability or is currently connected to the secondary
+     * {@link TelephonyManager#NETWORK_TYPE_NR} cellular network on millimeter wave bands.
+     *
+     * @see AccessNetworkConstants.NgranBands#FREQUENCY_RANGE_GROUP_2
+     */
+    public static final int OVERRIDE_NETWORK_TYPE_NR_NSA_MMWAVE = 4;
+
+    @NetworkType
+    private final  int mNetworkType;
+
+    @OverrideNetworkType
+    private final  int mOverrideNetworkType;
+
+    /**
+     * Constructor
+     *
+     * @param networkType Current packet-switching cellular network type
+     * @param overrideNetworkType The override network type
+     *
+     * @hide
+     */
+    public DisplayInfo(@NetworkType int networkType, @OverrideNetworkType int overrideNetworkType) {
+        mNetworkType = networkType;
+        mOverrideNetworkType = overrideNetworkType;
+    }
+
+    /** @hide */
+    public DisplayInfo(Parcel p) {
+        mNetworkType = p.readInt();
+        mOverrideNetworkType = p.readInt();
+    }
+
+    /**
+     * Get current packet-switching cellular network type. This is the actual network type the
+     * device is camped on.
+     *
+     * @return The network type.
+     */
+    @NetworkType
+    public int getNetworkType() {
+        return mNetworkType;
+    }
+
+    /**
+     * Get the override network type. Note the override network type is for market branding
+     * or visualization purposes only. It cannot be treated as the actual network type device is
+     * camped on.
+     *
+     * @return The override network type.
+     */
+    @OverrideNetworkType
+    public int getOverrideNetworkType() {
+        return mOverrideNetworkType;
+    }
+
+    @Override
+    public void writeToParcel(@NonNull Parcel dest, int flags) {
+        dest.writeInt(mNetworkType);
+        dest.writeInt(mOverrideNetworkType);
+    }
+
+    public static final @NonNull Parcelable.Creator<DisplayInfo> CREATOR =
+            new Parcelable.Creator<DisplayInfo>() {
+                @Override
+                public DisplayInfo createFromParcel(Parcel source) {
+                    return new DisplayInfo(source);
+                }
+
+                @Override
+                public DisplayInfo[] newArray(int size) {
+                    return new DisplayInfo[size];
+                }
+            };
+
+    @Override
+    public int describeContents() {
+        return 0;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        DisplayInfo that = (DisplayInfo) o;
+        return mNetworkType == that.mNetworkType
+                && mOverrideNetworkType == that.mOverrideNetworkType;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(mNetworkType, mOverrideNetworkType);
+    }
+
+    private static String overrideNetworkTypeToString(@OverrideNetworkType int type) {
+        switch (type) {
+            case OVERRIDE_NETWORK_TYPE_NONE: return "NONE";
+            case OVERRIDE_NETWORK_TYPE_LTE_CA: return "LTE_CA";
+            case OVERRIDE_NETWORK_TYPE_LTE_ADVANCED_PRO: return "LTE_ADV_PRO";
+            case OVERRIDE_NETWORK_TYPE_NR_NSA: return "NR_NSA";
+            case OVERRIDE_NETWORK_TYPE_NR_NSA_MMWAVE: return "NR_NSA_MMWAVE";
+            default: return "UNKNOWN";
+        }
+    }
+
+    @Override
+    public String toString() {
+        return "DisplayInfo {network=" + TelephonyManager.getNetworkTypeName(mNetworkType)
+                + ", override=" + overrideNetworkTypeToString(mOverrideNetworkType);
+    }
+}