diff --git a/services/accessibility/java/com/android/server/accessibility/magnification/MagnificationController.java b/services/accessibility/java/com/android/server/accessibility/magnification/MagnificationController.java
index 22e742bc09731..c1c47f53ab7ec 100644
--- a/services/accessibility/java/com/android/server/accessibility/magnification/MagnificationController.java
+++ b/services/accessibility/java/com/android/server/accessibility/magnification/MagnificationController.java
@@ -231,6 +231,12 @@ public class MagnificationController implements WindowMagnificationManager.Callb
      */
     public void transitionMagnificationModeLocked(int displayId, int targetMode,
             @NonNull TransitionCallBack transitionCallBack) {
+        // check if target mode is already activated
+        if (isActivated(displayId, targetMode)) {
+            transitionCallBack.onResult(displayId, true);
+            return;
+        }
+
         final PointF currentCenter = getCurrentMagnificationCenterLocked(displayId, targetMode);
         final DisableMagnificationCallback animationCallback =
                 getDisableMagnificationEndRunnableLocked(displayId);
@@ -322,13 +328,16 @@ public class MagnificationController implements WindowMagnificationManager.Callb
                     : config.getScale();
             try {
                 setTransitionState(displayId, targetMode);
+                final MagnificationAnimationCallback magnificationAnimationCallback = animate
+                        ? success -> mAms.changeMagnificationMode(displayId, targetMode)
+                        : null;
                 // Activate or deactivate target mode depending on config activated value
                 if (targetMode == MAGNIFICATION_MODE_WINDOW) {
                     screenMagnificationController.reset(displayId, false);
                     if (targetActivated) {
                         windowMagnificationMgr.enableWindowMagnification(displayId,
                                 targetScale, magnificationCenter.x, magnificationCenter.y,
-                                animate ? STUB_ANIMATION_CALLBACK : null, id);
+                                magnificationAnimationCallback, id);
                     } else {
                         windowMagnificationMgr.disableWindowMagnification(displayId, false);
                     }
@@ -339,8 +348,8 @@ public class MagnificationController implements WindowMagnificationManager.Callb
                             screenMagnificationController.register(displayId);
                         }
                         screenMagnificationController.setScaleAndCenter(displayId, targetScale,
-                                magnificationCenter.x, magnificationCenter.y, animate,
-                                id);
+                                magnificationCenter.x, magnificationCenter.y,
+                                magnificationAnimationCallback, id);
                     } else {
                         if (screenMagnificationController.isRegistered(displayId)) {
                             screenMagnificationController.reset(displayId, false);
@@ -348,6 +357,9 @@ public class MagnificationController implements WindowMagnificationManager.Callb
                     }
                 }
             } finally {
+                if (!animate) {
+                    mAms.changeMagnificationMode(displayId, targetMode);
+                }
                 // Reset transition state after enabling target mode.
                 setTransitionState(displayId, null);
             }
diff --git a/services/tests/servicestests/src/com/android/server/accessibility/magnification/MagnificationControllerTest.java b/services/tests/servicestests/src/com/android/server/accessibility/magnification/MagnificationControllerTest.java
index 913d8c1dda20b..11e4120e77e68 100644
--- a/services/tests/servicestests/src/com/android/server/accessibility/magnification/MagnificationControllerTest.java
+++ b/services/tests/servicestests/src/com/android/server/accessibility/magnification/MagnificationControllerTest.java
@@ -35,6 +35,7 @@ import static org.mockito.ArgumentMatchers.nullable;
 import static org.mockito.Mockito.doAnswer;
 import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.reset;
 import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
@@ -435,9 +436,9 @@ public class MagnificationControllerTest {
         mMockConnection.invokeCallbacks();
 
         assertFalse(mWindowMagnificationManager.isWindowMagnifierEnabled(TEST_DISPLAY));
-        verify(mScreenMagnificationController).setScaleAndCenter(TEST_DISPLAY,
-                DEFAULT_SCALE, MAGNIFIED_CENTER_X, MAGNIFIED_CENTER_Y,
-                animate, TEST_SERVICE_ID);
+        verify(mScreenMagnificationController).setScaleAndCenter(eq(TEST_DISPLAY),
+                eq(DEFAULT_SCALE), eq(MAGNIFIED_CENTER_X), eq(MAGNIFIED_CENTER_Y),
+                any(MagnificationAnimationCallback.class), eq(TEST_SERVICE_ID));
     }
 
     @Test
@@ -503,6 +504,42 @@ public class MagnificationControllerTest {
                 0);
     }
 
+    @Test
+    public void configTransitionToFullScreenWithAnimation_windowMagnifying_notifyService()
+            throws RemoteException {
+        final boolean animate = true;
+        activateMagnifier(MODE_WINDOW, MAGNIFIED_CENTER_X, MAGNIFIED_CENTER_Y);
+
+        reset(mService);
+        MagnificationConfig config = (new MagnificationConfig.Builder())
+                .setMode(MODE_FULLSCREEN).build();
+        mMagnificationController.transitionMagnificationConfigMode(TEST_DISPLAY,
+                config, animate, TEST_SERVICE_ID);
+        verify(mScreenMagnificationController).setScaleAndCenter(eq(TEST_DISPLAY),
+                /* scale= */ anyFloat(), /* centerX= */ anyFloat(), /* centerY= */ anyFloat(),
+                mCallbackArgumentCaptor.capture(), /* id= */ anyInt());
+        mCallbackArgumentCaptor.getValue().onResult(true);
+        mMockConnection.invokeCallbacks();
+
+        verify(mService).changeMagnificationMode(TEST_DISPLAY, MODE_FULLSCREEN);
+    }
+
+    @Test
+    public void configTransitionToFullScreenWithoutAnimation_windowMagnifying_notifyService()
+            throws RemoteException {
+        final boolean animate = false;
+        activateMagnifier(MODE_WINDOW, MAGNIFIED_CENTER_X, MAGNIFIED_CENTER_Y);
+
+        reset(mService);
+        MagnificationConfig config = (new MagnificationConfig.Builder())
+                .setMode(MODE_FULLSCREEN).build();
+        mMagnificationController.transitionMagnificationConfigMode(TEST_DISPLAY,
+                config, animate, TEST_SERVICE_ID);
+        mMockConnection.invokeCallbacks();
+
+        verify(mService).changeMagnificationMode(TEST_DISPLAY, MODE_FULLSCREEN);
+    }
+
     @Test
     public void interruptDuringTransitionToWindow_disablingFullScreen_discardPreviousTransition()
             throws RemoteException {