Prevent parent layers from overwriting child layer's alpha

LottieSample/src/androidTest/java/com/airbnb/lottie/samples/LottieTest.java

@@ -30,5 +30,6 @@ public void testAll() {
         TestRobot.testAnimation(getActivity(), "Tests/LoopPlayOnce.json");
         TestRobot.testAnimation(getActivity(), "Tests/Alarm.json");
         TestRobot.testAnimation(getActivity(), "Tests/CheckSwitch.json");
+        TestRobot.testAnimation(getActivity(), "Tests/EllipseTrimPath.json");
     }
 }

LottieSample/src/main/assets/Tests/EllipseTrimPath.json

@@ -0,0 +1 @@
+{"assets":[],"layers":[{"ddd":0,"ind":0,"ty":4,"nm":"Oval 2","ks":{"o":{"k":100},"r":{"k":0},"p":{"k":[51.972,46.722,0]},"a":{"k":[0,0,0]},"s":{"k":[100,100,100]}},"ao":0,"shapes":[{"ty":"gr","it":[{"d":1,"ty":"el","s":{"k":[10.056,10.056]},"p":{"k":[0,0]},"nm":"Ellipse Path 1"},{"ty":"st","fillEnabled":true,"c":{"k":[0,0.9,0.46,1]},"o":{"k":[{"i":{"x":[0.833],"y":[0.833]},"o":{"x":[0.167],"y":[0.167]},"n":["0p833_0p833_0p167_0p167"],"t":14,"s":[100],"e":[0]},{"t":15}]},"w":{"k":[{"i":{"x":[0.833],"y":[0.833]},"o":{"x":[0.167],"y":[0.167]},"n":["0p833_0p833_0p167_0p167"],"t":3,"s":[5],"e":[0.1]},{"t":14}]},"lc":1,"lj":1,"ml":4,"nm":"Stroke 1"},{"ty":"fl","fillEnabled":true,"c":{"k":[0,0.9,0.46,1]},"o":{"k":0},"nm":"Fill 1"},{"ty":"tr","p":{"k":[-1.972,3.278],"ix":2},"a":{"k":[0,0],"ix":1},"s":{"k":[{"i":{"x":[0.833,0.833],"y":[0.833,0.833]},"o":{"x":[0.167,0.167],"y":[0.167,0.167]},"n":["0p833_0p833_0p167_0p167","0p833_0p833_0p167_0p167"],"t":4,"s":[170,170],"e":[300,300]},{"t":14}],"ix":3},"r":{"k":0,"ix":6},"o":{"k":100,"ix":7},"sk":{"k":0,"ix":4},"sa":{"k":0,"ix":5},"nm":"Transform"}],"nm":"Ellipse 1"}],"ip":4,"op":58,"st":-36,"bm":0,"sr":1}],"v":"4.4.26","ddd":0,"ip":0,"op":66,"fr":60,"w":100,"h":100}

lottie/src/main/java/com/airbnb/lottie/layers/AnimatableLayer.java

@@ -233,9 +233,6 @@ void addLayer(AnimatableLayer layer) {
         layer.parentLayer = this;
         layers.add(layer);
         layer.setProgress(progress);
-        if (this.alpha != null) {
-            layer.setAlpha(this.alpha);
-        }
         invalidateSelf();
     }
 

lottie/src/main/java/com/airbnb/lottie/layers/EllipseShapeLayer.java

@@ -1,6 +1,5 @@
 package com.airbnb.lottie.layers;
 
-import android.graphics.Paint;
 import android.graphics.Path;
 import android.graphics.PointF;
 import android.graphics.drawable.Drawable;
@@ -82,17 +81,13 @@ public void onValueChanged(PointF progress) {
             }
         };
 
-        private final Paint paint = new Paint();
         private final Path path = new Path();
 
         private KeyframeAnimation<PointF> circleSize;
         private KeyframeAnimation<PointF> circlePosition;
 
         CircleShapeLayer(Drawable.Callback callback) {
             super(callback);
-            paint.setAntiAlias(true);
-            paint.setStyle(Paint.Style.FILL);
-
             setPath(new StaticKeyframeAnimation<>(path));
         }