Add slide animation to conversation list to archive.

app/src/main/java/org/thoughtcrime/securesms/util/Views.kt

@@ -0,0 +1,27 @@
+package org.thoughtcrime.securesms.util
+
+import android.view.View
+import android.view.animation.AnimationUtils
+import androidx.annotation.AnimRes
+
+/**
+ * Runs the given animation on this view, assuming that the view is in an INVISIBLE or HIDDEN state.
+ */
+fun View.runRevealAnimation(@AnimRes anim: Int) {
+  animation = AnimationUtils.loadAnimation(context, anim)
+  visible = true
+}
+
+/**
+ * Runs the given animation on this view, assuming that the view is in a VISIBLE state and will
+ * hide on completion
+ */
+fun View.runHideAnimation(@AnimRes anim: Int) {
+  startAnimation(
+    AnimationUtils.loadAnimation(context, anim).apply {
+      setListeners(onAnimationEnd = {
+        visible = false
+      })
+    }
+  )
+}