Rename PictureInPictureUiState#isEnteringPip

Renamed to PictureInPictureUiState#isTransitioningToPip per API review
feedback.

Flag: ENABLE_PIP_UI_STATE_CALLBACK_ON_ENTERING
Bug: 326097236
Test: atest CtsWindowManagerDeviceActivity:PinnedStackTests
Change-Id: I5dae2750fbf17468473dd7c685e5213561e18318
diff --git a/core/api/current.txt b/core/api/current.txt
index 9b89a65..1f29a39 100644
--- a/core/api/current.txt
+++ b/core/api/current.txt
@@ -7239,8 +7239,8 @@
 
   public final class PictureInPictureUiState implements android.os.Parcelable {
     method public int describeContents();
-    method @FlaggedApi("android.app.enable_pip_ui_state_callback_on_entering") public boolean isEnteringPip();
     method public boolean isStashed();
+    method @FlaggedApi("android.app.enable_pip_ui_state_callback_on_entering") public boolean isTransitioningToPip();
     method public void writeToParcel(@NonNull android.os.Parcel, int);
     field @NonNull public static final android.os.Parcelable.Creator<android.app.PictureInPictureUiState> CREATOR;
   }
diff --git a/core/java/android/app/PictureInPictureUiState.java b/core/java/android/app/PictureInPictureUiState.java
index 39ba54c..1629536 100644
--- a/core/java/android/app/PictureInPictureUiState.java
+++ b/core/java/android/app/PictureInPictureUiState.java
@@ -31,12 +31,12 @@
 public final class PictureInPictureUiState implements Parcelable {
 
     private final boolean mIsStashed;
-    private final boolean mIsEnteringPip;
+    private final boolean mIsTransitioningToPip;
 
     /** {@hide} */
     PictureInPictureUiState(Parcel in) {
         mIsStashed = in.readBoolean();
-        mIsEnteringPip = in.readBoolean();
+        mIsTransitioningToPip = in.readBoolean();
     }
 
     /** {@hide} */
@@ -45,9 +45,9 @@
         this(isStashed, false /* isEnteringPip */);
     }
 
-    private PictureInPictureUiState(boolean isStashed, boolean isEnteringPip) {
+    private PictureInPictureUiState(boolean isStashed, boolean isTransitioningToPip) {
         mIsStashed = isStashed;
-        mIsEnteringPip = isEnteringPip;
+        mIsTransitioningToPip = isTransitioningToPip;
     }
 
     /**
@@ -77,14 +77,14 @@
      * whether via auto enter PiP or calling
      * {@link Activity#enterPictureInPictureMode(PictureInPictureParams)} explicitly, app can expect
      * {@link Activity#onPictureInPictureUiStateChanged(PictureInPictureUiState)} callback with
-     * {@link #isEnteringPip()} to be {@code true} first,
+     * {@link #isTransitioningToPip()} to be {@code true} first,
      * followed by {@link Activity#onPictureInPictureModeChanged(boolean, Configuration)} when it
      * fully settles in PiP mode.
      *
      * When app receives the
      * {@link Activity#onPictureInPictureUiStateChanged(PictureInPictureUiState)} callback with
-     * {@link #isEnteringPip()} being {@code true}, it's recommended to hide certain UI elements,
-     * such as video controls, to archive a clean entering PiP animation.
+     * {@link #isTransitioningToPip()} being {@code true}, it's recommended to hide certain UI
+     * elements, such as video controls, to archive a clean entering PiP animation.
      *
      * In case an application wants to restore the previously hidden UI elements when exiting
      * PiP, it is recommended to do that in
@@ -92,8 +92,8 @@
      * than the beginning of exit PiP animation.
      */
     @FlaggedApi(Flags.FLAG_ENABLE_PIP_UI_STATE_CALLBACK_ON_ENTERING)
-    public boolean isEnteringPip() {
-        return mIsEnteringPip;
+    public boolean isTransitioningToPip() {
+        return mIsTransitioningToPip;
     }
 
     @Override
@@ -102,12 +102,12 @@
         if (!(o instanceof PictureInPictureUiState)) return false;
         PictureInPictureUiState that = (PictureInPictureUiState) o;
         return mIsStashed == that.mIsStashed
-                && mIsEnteringPip == that.mIsEnteringPip;
+                && mIsTransitioningToPip == that.mIsTransitioningToPip;
     }
 
     @Override
     public int hashCode() {
-        return Objects.hash(mIsStashed, mIsEnteringPip);
+        return Objects.hash(mIsStashed, mIsTransitioningToPip);
     }
 
     @Override
@@ -118,7 +118,7 @@
     @Override
     public void writeToParcel(@NonNull Parcel out, int flags) {
         out.writeBoolean(mIsStashed);
-        out.writeBoolean(mIsEnteringPip);
+        out.writeBoolean(mIsTransitioningToPip);
     }
 
     public static final @android.annotation.NonNull Creator<PictureInPictureUiState> CREATOR =
@@ -138,7 +138,7 @@
     @FlaggedApi(Flags.FLAG_ENABLE_PIP_UI_STATE_CALLBACK_ON_ENTERING)
     public static final class Builder {
         private boolean mIsStashed;
-        private boolean mIsEnteringPip;
+        private boolean mIsTransitioningToPip;
 
         /** Empty constructor. */
         public Builder() {
@@ -154,11 +154,11 @@
         }
 
         /**
-         * Sets the {@link #mIsEnteringPip} state.
+         * Sets the {@link #mIsTransitioningToPip} state.
          * @return The same {@link Builder} instance.
          */
-        public Builder setEnteringPip(boolean isEnteringPip) {
-            mIsEnteringPip = isEnteringPip;
+        public Builder setTransitioningToPip(boolean isEnteringPip) {
+            mIsTransitioningToPip = isEnteringPip;
             return this;
         }
 
@@ -166,7 +166,7 @@
          * @return The constructed {@link PictureInPictureUiState} instance.
          */
         public PictureInPictureUiState build() {
-            return new PictureInPictureUiState(mIsStashed, mIsEnteringPip);
+            return new PictureInPictureUiState(mIsStashed, mIsTransitioningToPip);
         }
     }
 }
diff --git a/core/tests/coretests/src/android/app/activity/ActivityThreadTest.java b/core/tests/coretests/src/android/app/activity/ActivityThreadTest.java
index ebf4cca..a7d083c 100644
--- a/core/tests/coretests/src/android/app/activity/ActivityThreadTest.java
+++ b/core/tests/coretests/src/android/app/activity/ActivityThreadTest.java
@@ -988,7 +988,7 @@
 
         @Override
         public void onPictureInPictureUiStateChanged(PictureInPictureUiState pipState) {
-            if (mPipUiStateLatch != null && pipState.isEnteringPip()) {
+            if (mPipUiStateLatch != null && pipState.isTransitioningToPip()) {
                 mPipUiStateLatch.countDown();
             }
         }
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/pip/PipTransitionController.java b/libs/WindowManager/Shell/src/com/android/wm/shell/pip/PipTransitionController.java
index d173175..32442f7 100644
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/pip/PipTransitionController.java
+++ b/libs/WindowManager/Shell/src/com/android/wm/shell/pip/PipTransitionController.java
@@ -191,7 +191,7 @@
             try {
                 ActivityTaskManager.getService().onPictureInPictureUiStateChanged(
                         new PictureInPictureUiState.Builder()
-                                .setEnteringPip(true)
+                                .setTransitioningToPip(true)
                                 .build());
             } catch (RemoteException | IllegalStateException e) {
                 ProtoLog.e(ShellProtoLogGroup.WM_SHELL_PICTURE_IN_PICTURE,
@@ -210,7 +210,7 @@
             try {
                 ActivityTaskManager.getService().onPictureInPictureUiStateChanged(
                         new PictureInPictureUiState.Builder()
-                                .setEnteringPip(false)
+                                .setTransitioningToPip(false)
                                 .build());
             } catch (RemoteException | IllegalStateException e) {
                 ProtoLog.e(ShellProtoLogGroup.WM_SHELL_PICTURE_IN_PICTURE,