diff --git a/core/java/android/app/NotificationChannel.java b/core/java/android/app/NotificationChannel.java
index c9cc1a1..05c9fca 100644
--- a/core/java/android/app/NotificationChannel.java
+++ b/core/java/android/app/NotificationChannel.java
@@ -124,8 +124,13 @@
     /**
      * The maximum length for text fields in a NotificationChannel. Fields will be truncated at this
      * limit.
+     * @hide
      */
-    private static final int MAX_TEXT_LENGTH = 1000;
+    public static final int MAX_TEXT_LENGTH = 1000;
+    /**
+     * @hide
+     */
+    public static final int MAX_VIBRATION_LENGTH = 1000;
 
     private static final String TAG_CHANNEL = "channel";
     private static final String ATT_NAME = "name";
@@ -283,17 +288,17 @@
      */
     protected NotificationChannel(Parcel in) {
         if (in.readByte() != 0) {
-            mId = in.readString();
+            mId = getTrimmedString(in.readString());
         } else {
             mId = null;
         }
         if (in.readByte() != 0) {
-            mName = in.readString();
+            mName = getTrimmedString(in.readString());
         } else {
             mName = null;
         }
         if (in.readByte() != 0) {
-            mDesc = in.readString();
+            mDesc = getTrimmedString(in.readString());
         } else {
             mDesc = null;
         }
@@ -302,18 +307,22 @@
         mLockscreenVisibility = in.readInt();
         if (in.readByte() != 0) {
             mSound = Uri.CREATOR.createFromParcel(in);
+            mSound = Uri.parse(getTrimmedString(mSound.toString()));
         } else {
             mSound = null;
         }
         mLights = in.readByte() != 0;
         mVibration = in.createLongArray();
+        if (mVibration != null && mVibration.length > MAX_VIBRATION_LENGTH) {
+            mVibration = Arrays.copyOf(mVibration, MAX_VIBRATION_LENGTH);
+        }
         mUserLockedFields = in.readInt();
         mFgServiceShown = in.readByte() != 0;
         mVibrationEnabled = in.readByte() != 0;
         mShowBadge = in.readByte() != 0;
         mDeleted = in.readByte() != 0;
         if (in.readByte() != 0) {
-            mGroup = in.readString();
+            mGroup = getTrimmedString(in.readString());
         } else {
             mGroup = null;
         }
@@ -322,8 +331,8 @@
         mBlockableSystem = in.readBoolean();
         mAllowBubbles = in.readInt();
         mOriginalImportance = in.readInt();
-        mParentId = in.readString();
-        mConversationId = in.readString();
+        mParentId = getTrimmedString(in.readString());
+        mConversationId = getTrimmedString(in.readString());
         mDemoted = in.readBoolean();
         mImportantConvo = in.readBoolean();
         mDeletedTime = in.readLong();
diff --git a/core/java/android/app/NotificationChannelGroup.java b/core/java/android/app/NotificationChannelGroup.java
index f97415c..2b245aa 100644
--- a/core/java/android/app/NotificationChannelGroup.java
+++ b/core/java/android/app/NotificationChannelGroup.java
@@ -43,8 +43,9 @@
     /**
      * The maximum length for text fields in a NotificationChannelGroup. Fields will be truncated at
      * this limit.
+     * @hide
      */
-    private static final int MAX_TEXT_LENGTH = 1000;
+    public static final int MAX_TEXT_LENGTH = 1000;
 
     private static final String TAG_GROUP = "channelGroup";
     private static final String ATT_NAME = "name";
@@ -90,13 +91,14 @@
      */
     protected NotificationChannelGroup(Parcel in) {
         if (in.readByte() != 0) {
-            mId = in.readString();
+            mId = getTrimmedString(in.readString());
         } else {
             mId = null;
         }
         mName = TextUtils.CHAR_SEQUENCE_CREATOR.createFromParcel(in);
+        mName = getTrimmedString(mName.toString());
         if (in.readByte() != 0) {
-            mDescription = in.readString();
+            mDescription = getTrimmedString(in.readString());
         } else {
             mDescription = null;
         }
@@ -120,7 +122,7 @@
         } else {
             dest.writeByte((byte) 0);
         }
-        TextUtils.writeToParcel(mName, dest, flags);
+        TextUtils.writeToParcel(mName.toString(), dest, flags);
         if (mDescription != null) {
             dest.writeByte((byte) 1);
             dest.writeString(mDescription);
diff --git a/core/tests/coretests/src/android/app/NotificationChannelGroupTest.java b/core/tests/coretests/src/android/app/NotificationChannelGroupTest.java
new file mode 100644
index 0000000..2a3da05
--- /dev/null
+++ b/core/tests/coretests/src/android/app/NotificationChannelGroupTest.java
@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2022 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.app;
+
+import static junit.framework.TestCase.assertEquals;
+
+import android.os.Parcel;
+import android.test.AndroidTestCase;
+
+import androidx.test.filters.SmallTest;
+import androidx.test.runner.AndroidJUnit4;
+
+import com.google.common.base.Strings;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import java.lang.reflect.Field;
+
+@RunWith(AndroidJUnit4.class)
+@SmallTest
+public class NotificationChannelGroupTest {
+    private final String CLASS = "android.app.NotificationChannelGroup";
+
+    @Test
+    public void testLongStringFields() {
+        NotificationChannelGroup group = new NotificationChannelGroup("my_group_01", "groupName");
+
+        try {
+            String longString = Strings.repeat("A", 65536);
+            Field mName = Class.forName(CLASS).getDeclaredField("mName");
+            mName.setAccessible(true);
+            mName.set(group, longString);
+            Field mId = Class.forName(CLASS).getDeclaredField("mId");
+            mId.setAccessible(true);
+            mId.set(group, longString);
+            Field mDescription = Class.forName(CLASS).getDeclaredField("mDescription");
+            mDescription.setAccessible(true);
+            mDescription.set(group, longString);
+        } catch (NoSuchFieldException e) {
+            e.printStackTrace();
+        } catch (ClassNotFoundException e) {
+            e.printStackTrace();
+        } catch (IllegalAccessException e) {
+            e.printStackTrace();
+        }
+
+        Parcel parcel = Parcel.obtain();
+        group.writeToParcel(parcel, 0);
+        parcel.setDataPosition(0);
+
+        NotificationChannelGroup fromParcel =
+                NotificationChannelGroup.CREATOR.createFromParcel(parcel);
+        assertEquals(NotificationChannelGroup.MAX_TEXT_LENGTH, fromParcel.getId().length());
+        assertEquals(NotificationChannelGroup.MAX_TEXT_LENGTH, fromParcel.getName().length());
+        assertEquals(NotificationChannelGroup.MAX_TEXT_LENGTH,
+                fromParcel.getDescription().length());
+    }
+}
diff --git a/core/tests/coretests/src/android/app/NotificationChannelTest.java b/core/tests/coretests/src/android/app/NotificationChannelTest.java
new file mode 100644
index 0000000..647bfe8
--- /dev/null
+++ b/core/tests/coretests/src/android/app/NotificationChannelTest.java
@@ -0,0 +1,106 @@
+/*
+ * Copyright (C) 2022 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.app;
+
+import static junit.framework.TestCase.assertEquals;
+
+import android.net.Uri;
+import android.os.Parcel;
+
+import androidx.test.filters.SmallTest;
+import androidx.test.runner.AndroidJUnit4;
+
+import com.google.common.base.Strings;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import java.lang.reflect.Field;
+
+@RunWith(AndroidJUnit4.class)
+@SmallTest
+public class NotificationChannelTest {
+    private final String CLASS = "android.app.NotificationChannel";
+
+    @Test
+    public void testLongStringFields() {
+        NotificationChannel channel = new NotificationChannel("id", "name", 3);
+
+        try {
+            String longString = Strings.repeat("A", 65536);
+            Field mName = Class.forName(CLASS).getDeclaredField("mName");
+            mName.setAccessible(true);
+            mName.set(channel, longString);
+            Field mId = Class.forName(CLASS).getDeclaredField("mId");
+            mId.setAccessible(true);
+            mId.set(channel, longString);
+            Field mDesc = Class.forName(CLASS).getDeclaredField("mDesc");
+            mDesc.setAccessible(true);
+            mDesc.set(channel, longString);
+            Field mParentId = Class.forName(CLASS).getDeclaredField("mParentId");
+            mParentId.setAccessible(true);
+            mParentId.set(channel, longString);
+            Field mGroup = Class.forName(CLASS).getDeclaredField("mGroup");
+            mGroup.setAccessible(true);
+            mGroup.set(channel, longString);
+            Field mConversationId = Class.forName(CLASS).getDeclaredField("mConversationId");
+            mConversationId.setAccessible(true);
+            mConversationId.set(channel, longString);
+        } catch (NoSuchFieldException e) {
+            e.printStackTrace();
+        } catch (ClassNotFoundException e) {
+            e.printStackTrace();
+        } catch (IllegalAccessException e) {
+            e.printStackTrace();
+        }
+
+        Parcel parcel = Parcel.obtain();
+        channel.writeToParcel(parcel, 0);
+        parcel.setDataPosition(0);
+
+        NotificationChannel fromParcel = NotificationChannel.CREATOR.createFromParcel(parcel);
+        assertEquals(NotificationChannel.MAX_TEXT_LENGTH, fromParcel.getId().length());
+        assertEquals(NotificationChannel.MAX_TEXT_LENGTH, fromParcel.getName().length());
+        assertEquals(NotificationChannel.MAX_TEXT_LENGTH,
+                fromParcel.getDescription().length());
+        assertEquals(NotificationChannel.MAX_TEXT_LENGTH,
+                fromParcel.getParentChannelId().length());
+        assertEquals(NotificationChannel.MAX_TEXT_LENGTH,
+                fromParcel.getGroup().length());
+        assertEquals(NotificationChannel.MAX_TEXT_LENGTH,
+                fromParcel.getConversationId().length());
+    }
+
+    @Test
+    public void testLongAlertFields() {
+        NotificationChannel channel = new NotificationChannel("id", "name", 3);
+
+        channel.setSound(Uri.parse("content://" + Strings.repeat("A",65536)),
+                Notification.AUDIO_ATTRIBUTES_DEFAULT);
+        channel.setVibrationPattern(new long[65550/2]);
+
+        Parcel parcel = Parcel.obtain();
+        channel.writeToParcel(parcel, 0);
+        parcel.setDataPosition(0);
+
+        NotificationChannel fromParcel = NotificationChannel.CREATOR.createFromParcel(parcel);
+        assertEquals(NotificationChannel.MAX_VIBRATION_LENGTH,
+                fromParcel.getVibrationPattern().length);
+        assertEquals(NotificationChannel.MAX_TEXT_LENGTH,
+                fromParcel.getSound().toString().length());
+    }
+}