call: hide preview feature

Change-Id: I8f22a67840d5f7ec4649a248894e86562af89f17
diff --git a/ring-android/app/src/main/res/values/dimens.xml b/ring-android/app/src/main/res/values/dimens.xml
index 275788b..2866f91 100644
--- a/ring-android/app/src/main/res/values/dimens.xml
+++ b/ring-android/app/src/main/res/values/dimens.xml
@@ -72,6 +72,8 @@
     <dimen name="call_preview_elevation">8dp</dimen>
     <dimen name="call_preview_elevation_dragged">16dp</dimen>
     <dimen name="call_preview_margin">12dp</dimen>
+    <dimen name="call_preview_margin_big">65dp</dimen>
+    <dimen name="call_preview_margin_handle">12dp</dimen>
 
     <dimen name="wizard_button_width">340dp</dimen>
     <dimen name="wizard_button_corner_radius">12dp</dimen>
diff --git a/ring-android/app/src/main/res/values/strings.xml b/ring-android/app/src/main/res/values/strings.xml
index 68c0be4..5fb04f3 100644
--- a/ring-android/app/src/main/res/values/strings.xml
+++ b/ring-android/app/src/main/res/values/strings.xml
@@ -154,6 +154,7 @@
     <string name="write_a_message">Write a message</string>
     <string name="scan_qr">Scan QR Code</string>
     <string name="ab_action_flipcamera">Flip camera</string>
+    <string name="ab_action_hidepreview">Hide preview</string>
 
     <!-- Text messages -->
     <string name="send_message">Send message</string>