up

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

@@ -39,10 +39,12 @@
     <LinearLayout
         android:id="@+id/ll_history"
         android:layout_width="match_parent"
-        android:layout_height="wrap_content"
+        android:layout_height="0dp"
+        android:background="@color/background"
         android:orientation="vertical"
         android:visibility="gone"
-        app:layout_constraintTop_toBottomOf="@id/title_bar">
+        app:layout_constraintTop_toBottomOf="@id/title_bar"
+        app:layout_constraintBottom_toBottomOf="parent">
 
         <TextView
             android:id="@+id/tv_book_show"
@@ -58,13 +60,28 @@
             android:layout_height="wrap_content"
             android:visibility="gone" />
 
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:orientation="horizontal">
+
             <TextView
                 android:id="@+id/tv_history"
-            android:layout_width="match_parent"
+                android:layout_width="0dp"
                 android:layout_height="wrap_content"
+                android:layout_weight="1"
                 android:padding="6dp"
                 android:text="@string/searchHistory" />
 
+            <TextView
+                android:id="@+id/tv_clear_history"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:padding="6dp"
+                android:text="@string/clear" />
+
+        </LinearLayout>
+
         <androidx.recyclerview.widget.RecyclerView
             android:id="@+id/rv_history_key"
             android:layout_width="wrap_content"