android: add style to test apk's

test/android/res/values/styles.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Base application theme. -->
+    <style name="AppTheme" parent="android:Theme.NoTitleBar.Fullscreen">
+        <!-- Customize your theme here. -->
+    </style>
+</resources>