Add animations.

app/src/main/java/chat/rocket/android/webview/WebViewActivity.kt

@@ -5,6 +5,7 @@ import android.content.Context
 import android.content.Intent
 import android.os.Bundle
 import android.support.v7.app.AppCompatActivity
+import android.webkit.WebView
 import android.webkit.WebViewClient
 import chat.rocket.android.R
 import kotlinx.android.synthetic.main.activity_web_view.*
@@ -40,7 +41,7 @@ class WebViewActivity : AppCompatActivity() {
         if (web_view.canGoBack()) {
             web_view.goBack()
         } else {
-            super.onBackPressed()
+            finishActivity()
         }
     }
 
@@ -48,7 +49,7 @@ class WebViewActivity : AppCompatActivity() {
         toolbar.title = getString(R.string.title_legal_terms)
         toolbar.setNavigationIcon(R.drawable.ic_close_white_24dp)
         toolbar.setNavigationOnClickListener {
-            finish()
+            finishActivity()
         }
     }
 
@@ -58,4 +59,9 @@ class WebViewActivity : AppCompatActivity() {
         web_view.webViewClient = WebViewClient()
         web_view.loadUrl(webPageUrl)
     }
+
+    private fun finishActivity() {
+        super.onBackPressed()
+        overridePendingTransition(R.anim.hold, R.anim.slide_down)
+    }
 }
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app/src/main/res/anim/hold.xml

+<?xml version="1.0" encoding="utf-8"?>
+<set xmlns:android="http://schemas.android.com/apk/res/android">
+    <translate
+        android:duration="800"
+        android:fromYDelta="0.0%p"
+        android:toYDelta="0.0%p" />
+</set>
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app/src/main/res/anim/slide_down.xml

+<?xml version="1.0" encoding="utf-8"?>
+<set xmlns:android="http://schemas.android.com/apk/res/android">
+    <translate xmlns:android="http://schemas.android.com/apk/res/android"
+        android:duration="350"
+        android:fromYDelta="0.0%"
+        android:toYDelta="100.0%" />
+</set>
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app/src/main/res/anim/slide_up.xml

+<?xml version="1.0" encoding="utf-8"?>
+<set xmlns:android="http://schemas.android.com/apk/res/android">
+    <translate xmlns:android="http://schemas.android.com/apk/res/android"
+        android:duration="350"
+        android:fromYDelta="100.0%"
+        android:toYDelta="0.0%" />
+</set>
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