add: google admob ads for testing

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

@@ -14,11 +14,17 @@
         android:layout_weight="1">
 
 
-        <FrameLayout
+        <com.google.android.gms.ads.AdView
+            xmlns:ads="http://schemas.android.com/apk/res-auto"
             android:id="@+id/ad"
             android:layout_width="match_parent"
             android:layout_height="match_parent"
-            android:animateLayoutChanges="true"/>
+            android:layout_alignParentBottom="true"
+            android:layout_centerHorizontal="true"
+            ads:adSize="FLUID"
+            ads:adUnitId="ca-app-pub-5495978608535144/3281269730">
+        </com.google.android.gms.ads.AdView>
+
 
         <TextView
             android:id="@+id/skip_view"
@@ -30,11 +36,10 @@
             android:layout_marginTop="20dp"
             android:background="@drawable/skip_circle_bg"
             android:gravity="center"
+            android:padding="8dp"
+            android:text="@string/text_skip"
             android:textColor="#ddffffff"
-            android:textSize="14sp"
-            android:visibility="invisible"
-            tools:text="跳过 4"
-            tools:visibility="visible"/>
+            android:textSize="14sp"/>
 
     </RelativeLayout>