Implement Animation Helper class to have methods for animation

Author: kunall17

app/src/main/java/com/zulip/android/util/AnimationHelper.java

@@ -0,0 +1,68 @@
+package com.zulip.android.util;
+
+import android.animation.Animator;
+import android.support.v4.view.animation.FastOutSlowInInterpolator;
+import android.view.View;
+import android.view.ViewPropertyAnimator;
+import android.view.animation.Interpolator;
+
+public class AnimationHelper {
+
+    private static final Interpolator FAST_OUT_SLOW_IN_INTERPOLATOR = new FastOutSlowInInterpolator();
+
+    public static void showView(final View view, int duration) {
+        ViewPropertyAnimator slideOutAnimator = view.animate()
+                .translationX(view.getWidth())
+                .setInterpolator(FAST_OUT_SLOW_IN_INTERPOLATOR)
+                .setDuration(duration);
+
+        slideOutAnimator.setListener(new Animator.AnimatorListener() {
+            @Override
+            public void onAnimationStart(Animator animator) {
+            }
+
+            @Override
+            public void onAnimationEnd(Animator animator) {
+                view.setVisibility(View.GONE);
+            }
+
+            @Override
+            public void onAnimationCancel(Animator animator) {
+            }
+
+            @Override
+            public void onAnimationRepeat(Animator animator) {
+            }
+        });
+        slideOutAnimator.start();
+    }
+
+    public static void hideView(final View view, int duration) {
+        ViewPropertyAnimator slideOutAnimator = view.animate()
+                .translationX(0)
+                .setInterpolator(FAST_OUT_SLOW_IN_INTERPOLATOR)
+                .setDuration(duration);
+
+        slideOutAnimator.setListener(new Animator.AnimatorListener() {
+            @Override
+            public void onAnimationStart(Animator animator) {
+                view.setVisibility(View.VISIBLE);
+            }
+
+            @Override
+            public void onAnimationEnd(Animator animator) {
+
+            }
+
+            @Override
+            public void onAnimationCancel(Animator animator) {
+
+            }
+
+            @Override
+            public void onAnimationRepeat(Animator animator) {
+            }
+        });
+        slideOutAnimator.start();
+    }
+}