修改启动页面和marker

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

@@ -4,14 +4,13 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:background="@drawable/ic_launcher_background"
+    android:background="@drawable/start_bg"
     tools:context="activity.MainActivity">
 
     <TextView
         android:id="@+id/tv_view"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="启动页"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintLeft_toLeftOf="parent"
         app:layout_constraintRight_toRightOf="parent"