Make placeholder pretty

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

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

@@ -68,17 +68,27 @@
                 app:fab_title="@string/create_from_file" />
         </com.wireguard.android.widget.fab.FloatingActionsMenu>
 
-        <RelativeLayout
+        <LinearLayout
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
+            android:orientation="vertical"
             android:visibility="@{tunnels.size() == 0 ? android.view.View.VISIBLE : android.view.View.GONE}"
             android:layout_gravity="center">
+            <android.support.v7.widget.AppCompatImageView
+                android:id="@+id/logo_placeholder"
+                android:layout_width="140dp"
+                android:layout_height="140dp"
+                android:layout_gravity="center"
+                android:tint="@color/transparent_background_placeholder"
+                android:layout_marginTop="-70dp"
+                android:layout_marginBottom="20dp"
+                android:src="@mipmap/ic_launcher" />
             <TextView
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
-                android:textSize="24sp"
-                android:layout_centerInParent="true"
-                android:text="@string/no_tunnels_imported_placeholder" />
-        </RelativeLayout>
+                android:layout_gravity="center"
+                android:textSize="20sp"
+                android:text="@string/tunnel_list_placeholder" />
+        </LinearLayout>
     </android.support.design.widget.CoordinatorLayout>
 </layout>

app/src/main/res/values-night/colors.xml

@@ -7,4 +7,7 @@
     <color name="fab_label_background_color">#bbbbbb</color>
 
     <color name="accent">#5e97f6</color>
+
+    <!-- TODO(msf): replace with ?android:attr/colorBackground with some alpha -->
+    <color name="transparent_background_placeholder">#aa2e2e2e</color>
 </resources>

app/src/main/res/values/colors.xml

@@ -7,4 +7,7 @@
     <color name="fab_label_background_color">#444444</color>
 
     <color name="accent">#2196F3</color>
+
+    <!-- TODO(msf): replace with ?android:attr/colorBackground with some alpha -->
+    <color name="transparent_background_placeholder">#aafafafa</color>
 </resources>

app/src/main/res/values/strings.xml

@@ -89,6 +89,7 @@
     <string name="tools_installer_title">Install command line tools</string>
     <string name="tunnel_create_error">Unable to create tunnel: %s</string>
     <string name="tunnel_create_success">Successfully created tunnel “%s”</string>
+    <string name="tunnel_list_placeholder">Add a tunnel using the blue button</string>
     <string name="tunnel_rename_error">Unable to rename tunnel: %s</string>
     <string name="tunnel_rename_success">Successfully renamed tunnel to “%s”</string>
     <string name="version_title">WireGuard for Android v%s"</string>
@@ -99,5 +100,4 @@
     <string name="zip_export_error">Unable to export tunnels: %s</string>
     <string name="zip_export_success">Saved to %s</string>
     <string name="zip_export_summary">Zip file will be saved to downloads folder</string>
-    <string name="no_tunnels_imported_placeholder">Tap the button at the bottom to begin</string>
 </resources>