Increase heights of individual volume sliders

- Uses layout_height=fill_parent to increase heights.
- Sets minHeight and maxHeight to keep thumb alignment.
  Without this setting, thumb alignment can be broken in lower version
  devices.
Bug: 24311740

Change-Id: I2bf1f06bdd8a323b85390ecb134d737265b6e102
diff --git a/v7/mediarouter/res/layout/mr_controller_volume_item.xml b/v7/mediarouter/res/layout/mr_controller_volume_item.xml
index 6cd0fd6..3b6ce71 100644
--- a/v7/mediarouter/res/layout/mr_controller_volume_item.xml
+++ b/v7/mediarouter/res/layout/mr_controller_volume_item.xml
@@ -39,6 +39,8 @@
                    android:src="?attr/mediaRouteAudioTrackDrawable" />
         <android.support.v7.app.MediaRouteVolumeSlider android:id="@+id/mr_volume_slider"
                  android:layout_width="fill_parent"
-                 android:layout_height="wrap_content" />
+                 android:layout_height="wrap_content"
+                 android:minHeight="40dp"
+                 android:maxHeight="40dp" />
     </LinearLayout>
 </LinearLayout>
diff --git a/v7/mediarouter/res/layout/mr_volume_control.xml b/v7/mediarouter/res/layout/mr_volume_control.xml
index 18d7864..d231c7a 100644
--- a/v7/mediarouter/res/layout/mr_volume_control.xml
+++ b/v7/mediarouter/res/layout/mr_volume_control.xml
@@ -32,6 +32,8 @@
             android:id="@+id/mr_volume_slider"
             android:layout_width="0dp"
             android:layout_height="wrap_content"
+            android:minHeight="48dp"
+            android:maxHeight="48dp"
             android:layout_weight="1"/>
     <android.support.v7.app.MediaRouteExpandCollapseButton
             android:id="@+id/mr_group_expand_collapse"