[Carousel] Fix item masking for API 21

Resolves #3330

GIT_ORIGIN_REV_ID=1c46e2882b074e35ab1f19af0af00f88dee84f4c
PiperOrigin-RevId: 523119333

Author: pubiqq

lib/java/com/google/android/material/carousel/MaskableFrameLayout.java

@@ -74,8 +74,8 @@ public MaskableFrameLayout(
   private MaskableDelegate createMaskableDelegate() {
     if (VERSION.SDK_INT >= VERSION_CODES.TIRAMISU) {
       return new MaskableDelegateV33(this);
-    } else if (VERSION.SDK_INT >= VERSION_CODES.LOLLIPOP) {
-      return new MaskableDelegateV21(this);
+    } else if (VERSION.SDK_INT >= VERSION_CODES.LOLLIPOP_MR1) {
+      return new MaskableDelegateV22(this);
     } else {
       return new MaskableDelegateV14();
     }
@@ -302,7 +302,7 @@ void maybeClip(Canvas canvas, CanvasOperation op) {
   }
 
   /**
-   * A {@link MaskableDelegate} implementation for API 14-20 that always clips using canvas
+   * A {@link MaskableDelegate} implementation for API 14-21 that always clips using canvas
    * clipping.
    */
   private static class MaskableDelegateV14 extends MaskableDelegate {
@@ -325,19 +325,20 @@ void invalidateClippingMethod(View view) {
   }
 
   /**
-   * A {@link MaskableDelegate} for API 21-32 that uses {@link ViewOutlineProvider} to clip when the
+   * A {@link MaskableDelegate} for API 22-32 that uses {@link ViewOutlineProvider} to clip when the
    * shape being clipped is a round rect with symmetrical corners and canvas clipping for all other
-   * shapes.
+   * shapes. This way is not used for API 21 because outline invalidation is incorrectly implemented
+   * in this version.
    *
    * <p>{@link Outline#setRoundRect(Rect, float)} is only able to clip to a rectangle with a single
    * corner radius for all four corners.
    */
-  @RequiresApi(VERSION_CODES.LOLLIPOP)
-  private static class MaskableDelegateV21 extends MaskableDelegate {
+  @RequiresApi(VERSION_CODES.LOLLIPOP_MR1)
+  private static class MaskableDelegateV22 extends MaskableDelegate {
 
     private boolean isShapeRoundRect = false;
 
-    MaskableDelegateV21(View view) {
+    MaskableDelegateV22(View view) {
       initMaskOutlineProvider(view);
     }
 

lib/javatests/com/google/android/material/carousel/MaskableFrameLayoutTest.java

@@ -74,8 +74,8 @@ public void testShapeAppearanceWithAbsoluteCornerSizes_shouldBeClamped() {
     assertThat(topRightCornerSize.getCornerSize(maskableFrameLayout.getMaskRectF())).isEqualTo(25F);
   }
 
-  @RequiresApi(api = VERSION_CODES.LOLLIPOP)
-  @Config(sdk = VERSION_CODES.LOLLIPOP)
+  @RequiresApi(api = VERSION_CODES.LOLLIPOP_MR1)
+  @Config(sdk = VERSION_CODES.LOLLIPOP_MR1)
   @Test
   public void testForceCompatClipping_shouldNotUseViewOutlineProvider() {
     MaskableFrameLayout maskableFrameLayout = createMaskableFrameLayoutWithSize(50, 50);
@@ -87,21 +87,21 @@ public void testForceCompatClipping_shouldNotUseViewOutlineProvider() {
     assertThat(maskableFrameLayout.getClipToOutline()).isFalse();
   }
 
-  @RequiresApi(api = VERSION_CODES.LOLLIPOP)
-  @Config(sdk = VERSION_CODES.LOLLIPOP)
+  @RequiresApi(api = VERSION_CODES.LOLLIPOP_MR1)
+  @Config(sdk = VERSION_CODES.LOLLIPOP_MR1)
   @Test
-  public void testRoundedCornersApi21_usesViewOutlineProvider() {
+  public void testRoundedCornersApi22_usesViewOutlineProvider() {
     MaskableFrameLayout maskableFrameLayout = createMaskableFrameLayoutWithSize(50, 50);
     ShapeAppearanceModel model = new ShapeAppearanceModel.Builder().setAllCornerSizes(10F).build();
     maskableFrameLayout.setShapeAppearanceModel(model);
 
     assertThat(maskableFrameLayout.getClipToOutline()).isTrue();
   }
 
-  @RequiresApi(api = VERSION_CODES.LOLLIPOP)
-  @Config(sdk = VERSION_CODES.LOLLIPOP)
+  @RequiresApi(api = VERSION_CODES.LOLLIPOP_MR1)
+  @Config(sdk = VERSION_CODES.LOLLIPOP_MR1)
   @Test
-  public void testCutCornersApi21_doesNotUseViewOutlineProvider() {
+  public void testCutCornersApi22_doesNotUseViewOutlineProvider() {
     MaskableFrameLayout maskableFrameLayout = createMaskableFrameLayoutWithSize(50, 50);
     ShapeAppearanceModel model =
         new ShapeAppearanceModel.Builder()