Preview layouts with values by using design-time layout attributes.

studio/app/src/main/res/layout-land/statistics.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
     android:orientation="vertical">
@@ -24,7 +25,9 @@
                     android:paddingRight="10dp"
                     android:text="@string/stat_distance" />
 
-                <TextView android:id="@+id/stat_distance" />
+                <TextView
+                    android:id="@+id/stat_distance"
+                    tools:text="2.72 km" />
             </TableRow>
 
             <TableRow
@@ -35,7 +38,9 @@
                     android:paddingRight="10dp"
                     android:text="@string/stat_overallaveragespeed" />
 
-                <TextView android:id="@+id/stat_overallaveragespeed" />
+                <TextView
+                    android:id="@+id/stat_overallaveragespeed"
+                    tools:text="3.27 km/h" />
             </TableRow>
 
             <TableRow
@@ -46,7 +51,9 @@
                     android:paddingRight="10dp"
                     android:text="@string/stat_averagespeed" />
 
-                <TextView android:id="@+id/stat_averagespeed" />
+                <TextView
+                    android:id="@+id/stat_averagespeed"
+                    tools:text="3.27 km/h" />
             </TableRow>
 
             <TableRow
@@ -57,7 +64,9 @@
                     android:paddingRight="10dp"
                     android:text="@string/stat_maximumspeed" />
 
-                <TextView android:id="@+id/stat_maximumspeed" />
+                <TextView
+                    android:id="@+id/stat_maximumspeed"
+                    tools:text="22.50 km/h" />
             </TableRow>
 
             <TableRow
@@ -68,7 +77,9 @@
                     android:paddingRight="10dp"
                     android:text="@string/stat_waypoints" />
 
-                <TextView android:id="@+id/stat_waypoints" />
+                <TextView
+                    android:id="@+id/stat_waypoints"
+                    tools:text="269" />
             </TableRow>
         </TableLayout>
 
@@ -86,7 +97,9 @@
                     android:paddingRight="10dp"
                     android:text="@string/stat_starttime" />
 
-                <nl.sogeti.android.gpstracker.util.DateView android:id="@+id/stat_starttime" />
+                <nl.sogeti.android.gpstracker.util.DateView
+                    android:id="@+id/stat_starttime"
+                    tools:text="15:10 February 29, 2016" />
             </TableRow>
 
             <TableRow
@@ -97,7 +110,9 @@
                     android:paddingRight="10dp"
                     android:text="@string/stat_endtime" />
 
-                <nl.sogeti.android.gpstracker.util.DateView android:id="@+id/stat_endtime" />
+                <nl.sogeti.android.gpstracker.util.DateView
+                    android:id="@+id/stat_endtime"
+                    tools:text="16:00 February 29, 2016" />
             </TableRow>
             <!--          <TableRow -->
             <!--             android:layout_width="wrap_content" -->
@@ -127,7 +142,9 @@
                     android:paddingRight="10dp"
                     android:text="@string/stat_elapsedtime" />
 
-                <TextView android:id="@+id/stat_elapsedtime" />
+                <TextView
+                    android:id="@+id/stat_elapsedtime"
+                    tools:text="0h:49m:54s" />
             </TableRow>
 
             <TableRow
@@ -138,7 +155,9 @@
                     android:paddingRight="10dp"
                     android:text="@string/stat_ascension" />
 
-                <TextView android:id="@+id/stat_ascension" />
+                <TextView
+                    android:id="@+id/stat_ascension"
+                    tools:text="20 meter" />
             </TableRow>
 
         </TableLayout>

studio/app/src/main/res/layout/contrib.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content">
 
@@ -8,5 +9,7 @@
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:autoLink="web|email"
-        android:linksClickable="true" />
+        android:linksClickable="true"
+        tools:text="@string/dialog_contrib_message" />
+
 </ScrollView>

studio/app/src/main/res/layout/fragment_about.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:orientation="vertical">
@@ -9,7 +10,8 @@
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:layout_margin="8dp"
-        android:layout_weight="0" />
+        android:layout_weight="0"
+        tools:text="Version 1.3.5 build 123"/>
 
     <WebView
         android:id="@+id/fragment_about_webview"

studio/app/src/main/res/layout/map.xml

@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
     android:id="@+id/mapScreen"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent">
@@ -59,7 +60,9 @@
         android:layout_marginTop="5dp"
         android:background="#80aaaaaa"
         android:textColor="#000000"
-        android:visibility="invisible" />
+        android:visibility="invisible"
+        tools:text="22km/h"
+        tools:visibility="visible" />
 
     <TextView
         android:id="@+id/speedview01"
@@ -71,7 +74,9 @@
         android:layout_marginTop="45dp"
         android:background="#80aaaaaa"
         android:textColor="#000000"
-        android:visibility="invisible" />
+        android:visibility="invisible"
+        tools:text="17 km/h"
+        tools:visibility="visible" />
 
     <TextView
         android:id="@+id/speedview02"
@@ -83,7 +88,9 @@
         android:layout_marginTop="100dp"
         android:background="#80aaaaaa"
         android:textColor="#ff000000"
-        android:visibility="invisible" />
+        android:visibility="invisible"
+        tools:text="13 km/h"
+        tools:visibility="visible" />
 
     <TextView
         android:id="@+id/speedview03"
@@ -95,7 +102,9 @@
         android:layout_marginTop="150dp"
         android:background="#80aaaaaa"
         android:textColor="#ff000000"
-        android:visibility="invisible" />
+        android:visibility="invisible"
+        tools:text="9 km/h"
+        tools:visibility="visible" />
 
     <TextView
         android:id="@+id/speedview04"
@@ -107,7 +116,9 @@
         android:layout_marginTop="200dp"
         android:background="#80aaaaaa"
         android:textColor="#ff000000"
-        android:visibility="invisible" />
+        android:visibility="invisible"
+        tools:text="4 km/h"
+        tools:visibility="visible" />
 
     <TextView
         android:id="@+id/speedview05"
@@ -119,7 +130,9 @@
         android:layout_marginTop="250dp"
         android:background="#80aaaaaa"
         android:textColor="#ff000000"
-        android:visibility="invisible" />
+        android:visibility="invisible"
+        tools:text="0 km/h"
+        tools:visibility="visible" />
 
     <ImageView
         android:id="@+id/speedbar"
@@ -130,7 +143,8 @@
         android:layout_marginRight="10dp"
         android:layout_marginTop="10dp"
         android:src="@drawable/speedindexbar"
-        android:visibility="invisible" />
+        android:visibility="invisible"
+        tools:visibility="visible" />
 
     <include layout="@layout/toolbar" />
 

studio/app/src/main/res/layout/section_header.xml

@@ -1,11 +1,13 @@
 <?xml version="1.0" encoding="utf-8"?>
 <TextView
     xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
     android:id="@+id/listitem_name"
     style="?android:attr/listSeparatorTextViewStyle"
     android:layout_width="fill_parent"
     android:layout_height="?android:attr/listPreferredItemHeight"
     android:gravity="center"
     android:paddingLeft="6dip"
     android:paddingRight="6dip"
-    android:textAppearance="?android:attr/textAppearanceMedium" />
+    android:textAppearance="?android:attr/textAppearanceMedium"
+    tools:text="Local" />

studio/app/src/main/res/layout/sharedialog.xml

@@ -1,4 +1,5 @@
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
     android:orientation="vertical">
@@ -71,7 +72,8 @@
                 android:layout_below="@+id/TextView4"
                 android:clickable="true"
                 android:inputType="textAutoCorrect"
-                android:singleLine="true" />
+                android:singleLine="true"
+                tools:text="Track 2016-02-29 15:10" />
 
             <ProgressBar
                 android:id="@+id/tweet_progress"
@@ -91,7 +93,7 @@
                 android:inputType="textAutoCorrect"
                 android:maxLength="140"
                 android:maxLines="3"
-                android:text="" />
+                tools:text="@string/tweettext" />
 
             <ImageView
                 android:id="@+id/imageView"

studio/app/src/main/res/layout/statistics.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:orientation="vertical">
@@ -19,7 +20,9 @@
                 android:paddingRight="15dp"
                 android:text="@string/stat_distance" />
 
-            <TextView android:id="@+id/stat_distance" />
+            <TextView
+                android:id="@+id/stat_distance"
+                tools:text="2.72 km" />
         </TableRow>
 
         <TableRow
@@ -30,7 +33,9 @@
                 android:paddingRight="15dp"
                 android:text="@string/stat_overallaveragespeed" />
 
-            <TextView android:id="@+id/stat_overallaveragespeed" />
+            <TextView
+                android:id="@+id/stat_overallaveragespeed"
+                tools:text="3.27 km/h" />
         </TableRow>
 
         <TableRow
@@ -41,7 +46,9 @@
                 android:paddingRight="15dp"
                 android:text="@string/stat_averagespeed" />
 
-            <TextView android:id="@+id/stat_averagespeed" />
+            <TextView
+                android:id="@+id/stat_averagespeed"
+                tools:text="3.27 km/h" />
         </TableRow>
 
         <TableRow
@@ -52,7 +59,9 @@
                 android:paddingRight="15dp"
                 android:text="@string/stat_maximumspeed" />
 
-            <TextView android:id="@+id/stat_maximumspeed" />
+            <TextView
+                android:id="@+id/stat_maximumspeed"
+                tools:text="22.50 km/h" />
         </TableRow>
 
         <TableRow
@@ -63,7 +72,9 @@
                 android:paddingRight="15dp"
                 android:text="@string/stat_waypoints" />
 
-            <TextView android:id="@+id/stat_waypoints" />
+            <TextView
+                android:id="@+id/stat_waypoints"
+                tools:text="269" />
         </TableRow>
 
         <TableRow
@@ -74,7 +85,9 @@
                 android:paddingRight="15dp"
                 android:text="@string/stat_starttime" />
 
-            <nl.sogeti.android.gpstracker.util.DateView android:id="@+id/stat_starttime" />
+            <nl.sogeti.android.gpstracker.util.DateView
+                android:id="@+id/stat_starttime"
+                tools:text="15:10 February 29, 2016" />
         </TableRow>
 
         <TableRow
@@ -85,7 +98,9 @@
                 android:paddingRight="15dp"
                 android:text="@string/stat_endtime" />
 
-            <nl.sogeti.android.gpstracker.util.DateView android:id="@+id/stat_endtime" />
+            <nl.sogeti.android.gpstracker.util.DateView
+                android:id="@+id/stat_endtime"
+                tools:text="16:00 February 29, 2016" />
         </TableRow>
 
         <TableRow
@@ -96,7 +111,9 @@
                 android:paddingRight="15dp"
                 android:text="@string/stat_elapsedtime" />
 
-            <TextView android:id="@+id/stat_elapsedtime" />
+            <TextView
+                android:id="@+id/stat_elapsedtime"
+                tools:text="0h:49m:54s" />
         </TableRow>
 
         <TableRow
@@ -107,7 +124,9 @@
                 android:paddingRight="15dp"
                 android:text="@string/stat_ascension" />
 
-            <TextView android:id="@+id/stat_ascension" />
+            <TextView
+                android:id="@+id/stat_ascension"
+                tools:text="20 meter" />
         </TableRow>
 
         <nl.sogeti.android.gpstracker.actions.utils.ViewFlipper