add preview texts for Android Studio

Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

app/src/main/res/layout/controller_generic_rv.xml

@@ -20,6 +20,7 @@
   -->
 
 <android.support.v4.widget.SwipeRefreshLayout xmlns:android="http://schemas.android.com/apk/res/android"
+                                              xmlns:tools="http://schemas.android.com/tools"
                                               android:id="@+id/swipe_refresh_layout"
                                               android:layout_width="match_parent"
                                               android:layout_height="match_parent"
@@ -28,7 +29,7 @@
     <android.support.v7.widget.RecyclerView
         android:id="@+id/recycler_view"
         android:layout_width="match_parent"
-        android:layout_height="match_parent">
-    </android.support.v7.widget.RecyclerView>
+        android:layout_height="match_parent"
+        tools:listitem="@layout/rv_item_call"/>
 
 </android.support.v4.widget.SwipeRefreshLayout>

app/src/main/res/layout/rv_item_call.xml

@@ -3,7 +3,9 @@
   ~ Nextcloud Talk application
   ~
   ~ @author Mario Danic
+  ~ @author Andy Scherzinger
   ~ Copyright (C) 2017 Mario Danic
+  ~ Copyright (C) 2017 Andy Scherzinger
   ~
   ~ This program is free software: you can redistribute it and/or modify
   ~ it under the terms of the GNU General Public License as published by
@@ -21,6 +23,7 @@
 
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                 xmlns:app="http://schemas.android.com/apk/res-auto"
+                xmlns:tools="http://schemas.android.com/tools"
                 android:layout_width="match_parent"
                 android:layout_height="@dimen/item_height">
 
@@ -63,14 +66,16 @@
             android:layout_height="wrap_content"
             android:ellipsize="middle"
             android:singleLine="true"
-            android:textAppearance="?android:attr/textAppearanceListItem"/>
+            android:textAppearance="?android:attr/textAppearanceListItem"
+            tools:text="Call item text"/>
 
         <TextView
             android:id="@+id/timestamp_text"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:singleLine="true"
-            android:textColor="?android:attr/textColorSecondary"/>
+            android:textColor="?android:attr/textColorSecondary"
+            tools:text="30/12/2017 12:30am"/>
 
     </LinearLayout>
 

app/src/main/res/layout/rv_item_contact.xml

@@ -3,7 +3,9 @@
   ~ Nextcloud Talk application
   ~
   ~ @author Mario Danic
+  ~ @author Andy Scherzinger
   ~ Copyright (C) 2017 Mario Danic
+  ~ Copyright (C) 2017 Andy Scherzinger
   ~
   ~ This program is free software: you can redistribute it and/or modify
   ~ it under the terms of the GNU General Public License as published by
@@ -21,6 +23,7 @@
 
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                 xmlns:app="http://schemas.android.com/apk/res-auto"
+                xmlns:tools="http://schemas.android.com/tools"
                 android:layout_width="match_parent"
                 android:layout_height="@dimen/item_height"
                 android:orientation="vertical">
@@ -58,6 +61,7 @@
         android:ellipsize="end"
         android:layout_marginEnd="@dimen/activity_horizontal_margin"
         android:textAppearance="?android:attr/textAppearanceListItem"
-        android:layout_toEndOf="@id/avatar_image"/>
+        android:layout_toEndOf="@id/avatar_image"
+        tools:text="Contact item text"/>
 
 </RelativeLayout>