[MaterialShapeDrawable] Implement getAlpha()

Resolves #2479 GIT_ORIGIN_REV_ID=20d18f9732871b06aa9f95af0bd02f23b3e7995a PiperOrigin-RevId: 412092198
material-components · Nov 29, 2021 · 5ff917d · 5ff917d
1 parent 3c9b452
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diff --git a/lib/java/com/google/android/material/shape/MaterialShapeDrawable.java b/lib/java/com/google/android/material/shape/MaterialShapeDrawable.java
@@ -455,6 +455,11 @@ public int getOpacity() {
     return PixelFormat.TRANSLUCENT;
   }
 
+  @Override
+  public int getAlpha() {
+    return drawableState.alpha;
+  }
+
   @Override
   public void setAlpha(@IntRange(from = 0, to = 255) int alpha) {
     if (drawableState.alpha != alpha) {

diff --git a/lib/javatests/com/google/android/material/shape/MaterialShapeDrawableTest.java b/lib/javatests/com/google/android/material/shape/MaterialShapeDrawableTest.java
@@ -34,6 +34,7 @@ public class MaterialShapeDrawableTest {
   private static final float ELEVATION = 4;
   private static final float TRANSLATION_Z = 2;
   private static final float Z = ELEVATION + TRANSLATION_Z;
+  private static final int ALPHA = 127;
 
   private final Context context = ApplicationProvider.getApplicationContext();
 
@@ -132,4 +133,11 @@ public void givenElevation_whenSetZ_setsTranslationZToDifferenceBetweenZAndEleva
     assertThat(drawable.getFillColor().getDefaultColor()).isEqualTo(colorSurface);
     assertThat(drawable.isElevationOverlayInitialized()).isTrue();
   }
+
+  @Test
+  public void whenSetAlpha_returnsAlpha() {
+    materialShapeDrawable.setAlpha(ALPHA);
+
+    assertThat(materialShapeDrawable.getAlpha()).isEqualTo(ALPHA);
+  }
 }