Merge pull request #46 from robertoestivill/animator_callbacks

Exposing AnimatorListener methods in AnimationComposer fix #45

Author: daimajia

library/src/main/java/com/daimajia/androidanimations/library/YoYo.java

@@ -62,6 +62,21 @@ public static AnimationComposer with(BaseViewAnimator animator) {
         return new AnimationComposer(animator);
     }
 
+    public interface AnimatorCallback {
+        public void call(Animator animator);
+    }
+
+    private static class EmptyAnimatorListener implements Animator.AnimatorListener {
+        @Override
+        public void onAnimationStart(Animator animation){}
+        @Override
+        public void onAnimationEnd(Animator animation){}
+        @Override
+        public void onAnimationCancel(Animator animation){}
+        @Override
+        public void onAnimationRepeat(Animator animation){}
+    }
+
     public static final class AnimationComposer {
 
         private List<Animator.AnimatorListener> callbacks = new ArrayList<Animator.AnimatorListener>();
@@ -101,6 +116,38 @@ public AnimationComposer withListener(Animator.AnimatorListener listener) {
             return this;
         }
 
+        public AnimationComposer onStart(final AnimatorCallback callback) {
+            callbacks.add(new EmptyAnimatorListener() {
+                @Override
+                public void onAnimationStart(Animator animation) { callback.call(animation); }
+            });
+            return this;
+        }
+
+        public AnimationComposer onEnd(final AnimatorCallback callback) {
+            callbacks.add(new EmptyAnimatorListener() {
+                @Override
+                public void onAnimationEnd(Animator animation) { callback.call(animation); }
+            });
+            return this;
+        }
+
+        public AnimationComposer onCancel(final AnimatorCallback callback) {
+            callbacks.add(new EmptyAnimatorListener() {
+                @Override
+                public void onAnimationCancel(Animator animation) { callback.call(animation); }
+            });
+            return this;
+        }
+
+        public AnimationComposer onRepeat(final AnimatorCallback callback) {
+            callbacks.add(new EmptyAnimatorListener() {
+                @Override
+                public void onAnimationRepeat(Animator animation) { callback.call(animation); }
+            });
+            return this;
+        }
+
         public YoYoString playOn(View target) {
             this.target = target;
             return new YoYoString(new YoYo(this).play(), this.target);