diff --git a/wear/protolayout/protolayout-proto/src/main/proto/resources.proto b/wear/protolayout/protolayout-proto/src/main/proto/resources.proto
index 7e04e8a..edfbff0 100644
--- a/wear/protolayout/protolayout-proto/src/main/proto/resources.proto
+++ b/wear/protolayout/protolayout-proto/src/main/proto/resources.proto
@@ -155,6 +155,9 @@
   //
   // If not set, the animation will play on load.</setter>
   androidx.wear.protolayout.expression.proto.DynamicFloat progress = 2;
+
+  // The trigger to start the animation.
+  Trigger start_trigger = 3;
 }
 
 // An image resource, which can be used by layouts. This holds multiple
diff --git a/wear/protolayout/protolayout/api/current.txt b/wear/protolayout/protolayout/api/current.txt
index 21886f5..ba2171c 100644
--- a/wear/protolayout/protolayout/api/current.txt
+++ b/wear/protolayout/protolayout/api/current.txt
@@ -1309,12 +1309,14 @@
   @androidx.wear.protolayout.expression.RequiresSchemaVersion(major=1, minor=500) public static final class ResourceBuilders.AndroidLottieResourceByResId {
     method public androidx.wear.protolayout.expression.DynamicBuilders.DynamicFloat? getProgress();
     method @RawRes public int getRawResourceId();
+    method public androidx.wear.protolayout.TriggerBuilders.Trigger? getStartTrigger();
   }
 
   public static final class ResourceBuilders.AndroidLottieResourceByResId.Builder {
     ctor @androidx.wear.protolayout.expression.RequiresSchemaVersion(major=1, minor=500) public ResourceBuilders.AndroidLottieResourceByResId.Builder(@RawRes int);
     method public androidx.wear.protolayout.ResourceBuilders.AndroidLottieResourceByResId build();
     method @androidx.wear.protolayout.expression.RequiresSchemaVersion(major=1, minor=500) public androidx.wear.protolayout.ResourceBuilders.AndroidLottieResourceByResId.Builder setProgress(androidx.wear.protolayout.expression.DynamicBuilders.DynamicFloat);
+    method @androidx.wear.protolayout.expression.RequiresSchemaVersion(major=1, minor=500) public androidx.wear.protolayout.ResourceBuilders.AndroidLottieResourceByResId.Builder setStartTrigger(androidx.wear.protolayout.TriggerBuilders.Trigger);
   }
 
   @SuppressCompatibility @androidx.wear.protolayout.expression.ProtoLayoutExperimental @androidx.wear.protolayout.expression.RequiresSchemaVersion(major=1, minor=200) public static final class ResourceBuilders.AndroidSeekableAnimatedImageResourceByResId {
@@ -1434,6 +1436,24 @@
   public final class TriggerBuilders {
     method @androidx.wear.protolayout.expression.RequiresSchemaVersion(major=1, minor=200) public static androidx.wear.protolayout.TriggerBuilders.Trigger createOnConditionMetTrigger(androidx.wear.protolayout.expression.DynamicBuilders.DynamicBool);
     method @androidx.wear.protolayout.expression.RequiresSchemaVersion(major=1, minor=200) public static androidx.wear.protolayout.TriggerBuilders.Trigger createOnLoadTrigger();
+    method @androidx.wear.protolayout.expression.RequiresSchemaVersion(major=1, minor=200) public static androidx.wear.protolayout.TriggerBuilders.Trigger createOnVisibleOnceTrigger();
+    method @androidx.wear.protolayout.expression.RequiresSchemaVersion(major=1, minor=200) public static androidx.wear.protolayout.TriggerBuilders.Trigger createOnVisibleTrigger();
+  }
+
+  @androidx.wear.protolayout.expression.RequiresSchemaVersion(major=1, minor=200) public static final class TriggerBuilders.OnVisibleOnceTrigger implements androidx.wear.protolayout.TriggerBuilders.Trigger {
+  }
+
+  public static final class TriggerBuilders.OnVisibleOnceTrigger.Builder {
+    ctor @androidx.wear.protolayout.expression.RequiresSchemaVersion(major=1, minor=200) public TriggerBuilders.OnVisibleOnceTrigger.Builder();
+    method public androidx.wear.protolayout.TriggerBuilders.OnVisibleOnceTrigger build();
+  }
+
+  @androidx.wear.protolayout.expression.RequiresSchemaVersion(major=1, minor=200) public static final class TriggerBuilders.OnVisibleTrigger implements androidx.wear.protolayout.TriggerBuilders.Trigger {
+  }
+
+  public static final class TriggerBuilders.OnVisibleTrigger.Builder {
+    ctor @androidx.wear.protolayout.expression.RequiresSchemaVersion(major=1, minor=200) public TriggerBuilders.OnVisibleTrigger.Builder();
+    method public androidx.wear.protolayout.TriggerBuilders.OnVisibleTrigger build();
   }
 
   @androidx.wear.protolayout.expression.RequiresSchemaVersion(major=1, minor=200) public static interface TriggerBuilders.Trigger {
diff --git a/wear/protolayout/protolayout/api/restricted_current.txt b/wear/protolayout/protolayout/api/restricted_current.txt
index 21886f5..ba2171c 100644
--- a/wear/protolayout/protolayout/api/restricted_current.txt
+++ b/wear/protolayout/protolayout/api/restricted_current.txt
@@ -1309,12 +1309,14 @@
   @androidx.wear.protolayout.expression.RequiresSchemaVersion(major=1, minor=500) public static final class ResourceBuilders.AndroidLottieResourceByResId {
     method public androidx.wear.protolayout.expression.DynamicBuilders.DynamicFloat? getProgress();
     method @RawRes public int getRawResourceId();
+    method public androidx.wear.protolayout.TriggerBuilders.Trigger? getStartTrigger();
   }
 
   public static final class ResourceBuilders.AndroidLottieResourceByResId.Builder {
     ctor @androidx.wear.protolayout.expression.RequiresSchemaVersion(major=1, minor=500) public ResourceBuilders.AndroidLottieResourceByResId.Builder(@RawRes int);
     method public androidx.wear.protolayout.ResourceBuilders.AndroidLottieResourceByResId build();
     method @androidx.wear.protolayout.expression.RequiresSchemaVersion(major=1, minor=500) public androidx.wear.protolayout.ResourceBuilders.AndroidLottieResourceByResId.Builder setProgress(androidx.wear.protolayout.expression.DynamicBuilders.DynamicFloat);
+    method @androidx.wear.protolayout.expression.RequiresSchemaVersion(major=1, minor=500) public androidx.wear.protolayout.ResourceBuilders.AndroidLottieResourceByResId.Builder setStartTrigger(androidx.wear.protolayout.TriggerBuilders.Trigger);
   }
 
   @SuppressCompatibility @androidx.wear.protolayout.expression.ProtoLayoutExperimental @androidx.wear.protolayout.expression.RequiresSchemaVersion(major=1, minor=200) public static final class ResourceBuilders.AndroidSeekableAnimatedImageResourceByResId {
@@ -1434,6 +1436,24 @@
   public final class TriggerBuilders {
     method @androidx.wear.protolayout.expression.RequiresSchemaVersion(major=1, minor=200) public static androidx.wear.protolayout.TriggerBuilders.Trigger createOnConditionMetTrigger(androidx.wear.protolayout.expression.DynamicBuilders.DynamicBool);
     method @androidx.wear.protolayout.expression.RequiresSchemaVersion(major=1, minor=200) public static androidx.wear.protolayout.TriggerBuilders.Trigger createOnLoadTrigger();
+    method @androidx.wear.protolayout.expression.RequiresSchemaVersion(major=1, minor=200) public static androidx.wear.protolayout.TriggerBuilders.Trigger createOnVisibleOnceTrigger();
+    method @androidx.wear.protolayout.expression.RequiresSchemaVersion(major=1, minor=200) public static androidx.wear.protolayout.TriggerBuilders.Trigger createOnVisibleTrigger();
+  }
+
+  @androidx.wear.protolayout.expression.RequiresSchemaVersion(major=1, minor=200) public static final class TriggerBuilders.OnVisibleOnceTrigger implements androidx.wear.protolayout.TriggerBuilders.Trigger {
+  }
+
+  public static final class TriggerBuilders.OnVisibleOnceTrigger.Builder {
+    ctor @androidx.wear.protolayout.expression.RequiresSchemaVersion(major=1, minor=200) public TriggerBuilders.OnVisibleOnceTrigger.Builder();
+    method public androidx.wear.protolayout.TriggerBuilders.OnVisibleOnceTrigger build();
+  }
+
+  @androidx.wear.protolayout.expression.RequiresSchemaVersion(major=1, minor=200) public static final class TriggerBuilders.OnVisibleTrigger implements androidx.wear.protolayout.TriggerBuilders.Trigger {
+  }
+
+  public static final class TriggerBuilders.OnVisibleTrigger.Builder {
+    ctor @androidx.wear.protolayout.expression.RequiresSchemaVersion(major=1, minor=200) public TriggerBuilders.OnVisibleTrigger.Builder();
+    method public androidx.wear.protolayout.TriggerBuilders.OnVisibleTrigger build();
   }
 
   @androidx.wear.protolayout.expression.RequiresSchemaVersion(major=1, minor=200) public static interface TriggerBuilders.Trigger {
diff --git a/wear/protolayout/protolayout/src/main/java/androidx/wear/protolayout/ResourceBuilders.java b/wear/protolayout/protolayout/src/main/java/androidx/wear/protolayout/ResourceBuilders.java
index 0fff0a2..a51c996 100644
--- a/wear/protolayout/protolayout/src/main/java/androidx/wear/protolayout/ResourceBuilders.java
+++ b/wear/protolayout/protolayout/src/main/java/androidx/wear/protolayout/ResourceBuilders.java
@@ -520,6 +520,15 @@
             }
         }
 
+        /** Gets the trigger to start the animation. */
+        public @Nullable Trigger getStartTrigger() {
+            if (mImpl.hasStartTrigger()) {
+                return TriggerBuilders.triggerFromProto(mImpl.getStartTrigger());
+            } else {
+                return null;
+            }
+        }
+
         /** Creates a new wrapper instance from the proto. */
         @RestrictTo(Scope.LIBRARY_GROUP)
         public static @NonNull AndroidLottieResourceByResId fromProto(
@@ -540,6 +549,8 @@
                     + getRawResourceId()
                     + ", progress="
                     + getProgress()
+                    + ", startTrigger="
+                    + getStartTrigger()
                     + "}";
         }
 
@@ -590,6 +601,13 @@
                 return this;
             }
 
+            /** Sets the trigger to start the animation. */
+            @RequiresSchemaVersion(major = 1, minor = 500)
+            public @NonNull Builder setStartTrigger(@NonNull Trigger startTrigger) {
+                mImpl.setStartTrigger(startTrigger.toTriggerProto());
+                return this;
+            }
+
             /** Builds an instance from accumulated values. */
             public @NonNull AndroidLottieResourceByResId build() {
                 return AndroidLottieResourceByResId.fromProto(mImpl.build());
diff --git a/wear/protolayout/protolayout/src/main/java/androidx/wear/protolayout/TriggerBuilders.java b/wear/protolayout/protolayout/src/main/java/androidx/wear/protolayout/TriggerBuilders.java
index 1a96d0e..d05a53c 100644
--- a/wear/protolayout/protolayout/src/main/java/androidx/wear/protolayout/TriggerBuilders.java
+++ b/wear/protolayout/protolayout/src/main/java/androidx/wear/protolayout/TriggerBuilders.java
@@ -48,6 +48,160 @@
         return new OnConditionMetTrigger.Builder().setCondition(dynamicBool).build();
     }
 
+    /**
+     * Creates a {@link Trigger} that fires *every time* the layout becomes visible.
+     *
+     * <p>As opposed to {@link #createOnLoadTrigger()}, this will wait until layout is fully visible
+     * before firing a trigger.
+     */
+    @RequiresSchemaVersion(major = 1, minor = 200)
+    public static @NonNull Trigger createOnVisibleTrigger() {
+        return new OnVisibleTrigger.Builder().build();
+    }
+
+    /**
+     * Creates a {@link Trigger} that fires the first time that layout becomes visible.
+     *
+     * <p>As opposed to {@link #createOnVisibleTrigger()}, this will only be fired the first time
+     * that the layout becomes visible.
+     */
+    @RequiresSchemaVersion(major = 1, minor = 200)
+    public static @NonNull Trigger createOnVisibleOnceTrigger() {
+        return new OnVisibleOnceTrigger.Builder().build();
+    }
+
+    /** Triggers when the layout visibility state turns from invisible to fully visible. */
+    @RequiresSchemaVersion(major = 1, minor = 200)
+    public static final class OnVisibleTrigger implements Trigger {
+        private final TriggerProto.OnVisibleTrigger mImpl;
+        private final @Nullable Fingerprint mFingerprint;
+
+        OnVisibleTrigger(TriggerProto.OnVisibleTrigger impl, @Nullable Fingerprint fingerprint) {
+            this.mImpl = impl;
+            this.mFingerprint = fingerprint;
+        }
+
+        @Override
+        @RestrictTo(Scope.LIBRARY_GROUP)
+        public @Nullable Fingerprint getFingerprint() {
+            return mFingerprint;
+        }
+
+        /** Creates a new wrapper instance from the proto. */
+        @RestrictTo(Scope.LIBRARY_GROUP)
+        public static @NonNull OnVisibleTrigger fromProto(
+                TriggerProto.@NonNull OnVisibleTrigger proto, @Nullable Fingerprint fingerprint) {
+            return new OnVisibleTrigger(proto, fingerprint);
+        }
+
+        static @NonNull OnVisibleTrigger fromProto(TriggerProto.@NonNull OnVisibleTrigger proto) {
+            return fromProto(proto, null);
+        }
+
+        /** Returns the internal proto instance. */
+        TriggerProto.@NonNull OnVisibleTrigger toProto() {
+            return mImpl;
+        }
+
+        @Override
+        @RestrictTo(Scope.LIBRARY_GROUP)
+        public TriggerProto.@NonNull Trigger toTriggerProto() {
+            return TriggerProto.Trigger.newBuilder().setOnVisibleTrigger(mImpl).build();
+        }
+
+        @Override
+        public @NonNull String toString() {
+            return "OnVisibleTrigger";
+        }
+
+        /** Builder for {@link OnVisibleTrigger}. */
+        @SuppressWarnings("HiddenSuperclass")
+        public static final class Builder implements Trigger.Builder {
+            private final TriggerProto.OnVisibleTrigger.Builder mImpl =
+                    TriggerProto.OnVisibleTrigger.newBuilder();
+            private final Fingerprint mFingerprint = new Fingerprint(1416366796);
+
+            /** Creates an instance of {@link Builder}. */
+            @RequiresSchemaVersion(major = 1, minor = 200)
+            public Builder() {}
+
+            /** Builds an instance from accumulated values. */
+            @Override
+            public @NonNull OnVisibleTrigger build() {
+                return new OnVisibleTrigger(mImpl.build(), mFingerprint);
+            }
+        }
+    }
+
+    /**
+     * Triggers only once when the layout visibility state turns from invisible to fully visible for
+     * the first time.
+     */
+    @RequiresSchemaVersion(major = 1, minor = 200)
+    public static final class OnVisibleOnceTrigger implements Trigger {
+        private final TriggerProto.OnVisibleOnceTrigger mImpl;
+        private final @Nullable Fingerprint mFingerprint;
+
+        OnVisibleOnceTrigger(
+                TriggerProto.OnVisibleOnceTrigger impl, @Nullable Fingerprint fingerprint) {
+            this.mImpl = impl;
+            this.mFingerprint = fingerprint;
+        }
+
+        @Override
+        @RestrictTo(Scope.LIBRARY_GROUP)
+        public @Nullable Fingerprint getFingerprint() {
+            return mFingerprint;
+        }
+
+        /** Creates a new wrapper instance from the proto. */
+        @RestrictTo(Scope.LIBRARY_GROUP)
+        public static @NonNull OnVisibleOnceTrigger fromProto(
+                TriggerProto.@NonNull OnVisibleOnceTrigger proto,
+                @Nullable Fingerprint fingerprint) {
+            return new OnVisibleOnceTrigger(proto, fingerprint);
+        }
+
+        static @NonNull OnVisibleOnceTrigger fromProto(
+                TriggerProto.@NonNull OnVisibleOnceTrigger proto) {
+            return fromProto(proto, null);
+        }
+
+        /** Returns the internal proto instance. */
+        TriggerProto.@NonNull OnVisibleOnceTrigger toProto() {
+            return mImpl;
+        }
+
+        @Override
+        @RestrictTo(Scope.LIBRARY_GROUP)
+        public TriggerProto.@NonNull Trigger toTriggerProto() {
+            return TriggerProto.Trigger.newBuilder().setOnVisibleOnceTrigger(mImpl).build();
+        }
+
+        @Override
+        public @NonNull String toString() {
+            return "OnVisibleOnceTrigger";
+        }
+
+        /** Builder for {@link OnVisibleOnceTrigger}. */
+        @SuppressWarnings("HiddenSuperclass")
+        public static final class Builder implements Trigger.Builder {
+            private final TriggerProto.OnVisibleOnceTrigger.Builder mImpl =
+                    TriggerProto.OnVisibleOnceTrigger.newBuilder();
+            private final Fingerprint mFingerprint = new Fingerprint(-1661457257);
+
+            /** Creates an instance of {@link Builder}. */
+            @RequiresSchemaVersion(major = 1, minor = 200)
+            public Builder() {}
+
+            /** Builds an instance from accumulated values. */
+            @Override
+            public @NonNull OnVisibleOnceTrigger build() {
+                return new OnVisibleOnceTrigger(mImpl.build(), mFingerprint);
+            }
+        }
+    }
+
     /** Triggers immediately when the layout is loaded / reloaded. */
     @RequiresSchemaVersion(major = 1, minor = 200)
     static final class OnLoadTrigger implements Trigger {
@@ -225,6 +379,12 @@
     @RestrictTo(Scope.LIBRARY_GROUP)
     public static @NonNull Trigger triggerFromProto(
             TriggerProto.@NonNull Trigger proto, @Nullable Fingerprint fingerprint) {
+        if (proto.hasOnVisibleTrigger()) {
+            return OnVisibleTrigger.fromProto(proto.getOnVisibleTrigger(), fingerprint);
+        }
+        if (proto.hasOnVisibleOnceTrigger()) {
+            return OnVisibleOnceTrigger.fromProto(proto.getOnVisibleOnceTrigger(), fingerprint);
+        }
         if (proto.hasOnLoadTrigger()) {
             return OnLoadTrigger.fromProto(proto.getOnLoadTrigger(), fingerprint);
         }
diff --git a/wear/protolayout/protolayout/src/test/java/androidx/wear/protolayout/ResourceBuildersTest.java b/wear/protolayout/protolayout/src/test/java/androidx/wear/protolayout/ResourceBuildersTest.java
index 3591875..c0256c3 100644
--- a/wear/protolayout/protolayout/src/test/java/androidx/wear/protolayout/ResourceBuildersTest.java
+++ b/wear/protolayout/protolayout/src/test/java/androidx/wear/protolayout/ResourceBuildersTest.java
@@ -74,9 +74,25 @@
                         .setProgress(DynamicBuilders.DynamicFloat.from(new AppDataKey<>(stateKey)))
                         .build();
 
-        ResourceProto.AndroidLottieResourceByResId avdProto = lottieResource.toProto();
+        ResourceProto.AndroidLottieResourceByResId lottieProto = lottieResource.toProto();
 
-        assertThat(avdProto.getRawResourceId()).isEqualTo(RESOURCE_ID);
-        assertThat(avdProto.getProgress().getStateSource().getSourceKey()).isEqualTo(stateKey);
+        assertThat(lottieProto.getRawResourceId()).isEqualTo(RESOURCE_ID);
+        assertThat(lottieProto.getProgress().getStateSource().getSourceKey()).isEqualTo(stateKey);
+    }
+
+    @Test
+    public void lottieAnimation_hasTrigger() {
+        ResourceBuilders.AndroidLottieResourceByResId lottieResource =
+                new ResourceBuilders.AndroidLottieResourceByResId.Builder(RESOURCE_ID)
+                        .setStartTrigger(TriggerBuilders.createOnVisibleTrigger())
+                        .build();
+
+        ResourceProto.AndroidLottieResourceByResId lottieProto = lottieResource.toProto();
+
+        assertThat(lottieProto.getRawResourceId()).isEqualTo(RESOURCE_ID);
+        assertThat(lottieProto.hasStartTrigger()).isTrue();
+        assertThat(lottieProto.getStartTrigger().hasOnVisibleTrigger()).isTrue();
+        assertThat(lottieProto.getStartTrigger().hasOnVisibleOnceTrigger()).isFalse();
+        assertThat(lottieProto.getStartTrigger().hasOnLoadTrigger()).isFalse();
     }
 }