1.布局添加framelayout

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

     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:background="@drawable/main_bg"
-    android:orientation="vertical"
-    android:paddingTop="30dp">
+    android:orientation="vertical">
 
     <FrameLayout
         android:layout_width="match_parent"
         android:layout_height="match_parent">
+
         <LinearLayout
             android:layout_width="match_parent"
             android:layout_height="match_parent"
-            android:orientation="vertical">
+            android:orientation="vertical"
+            android:paddingTop="30dp">
 
             <Button
                 android:id="@+id/btn"
                 android:layout_marginTop="24dp"
                 android:overScrollMode="never" />
         </LinearLayout>
+
         <TextView
             android:id="@+id/timestoptv"
             android:layout_width="match_parent"
             android:layout_height="match_parent"
+            android:background="@color/white"
             android:gravity="center"
-            android:text="@string/stoptips"
+            android:text="@string/timestoptips"
             android:textColor="@color/black"
-            android:textSize="20sp"
-            android:visibility="gone" />
+            android:textSize="20sp" />
 
         <TextView
             android:id="@+id/stoptv"
             android:layout_width="match_parent"
             android:layout_height="match_parent"
+            android:background="@color/white"
             android:gravity="center"
             android:text="@string/stoptips"
             android:textColor="@color/black"
-            android:textSize="20sp"
-            android:visibility="gone" />
+            android:textSize="20sp" />
     </FrameLayout>
 </LinearLayout>