舍弃原来的主题系统

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

@@ -36,7 +36,6 @@
         android:contentDescription="@string/edit"
         android:padding="6dp"
         android:src="@drawable/ic_edit"
-        android:tint="@color/primaryText"
         android:tooltipText="@string/edit"
         app:layout_constraintBottom_toTopOf="@id/title_example"
         app:layout_constraintRight_toLeftOf="@id/iv_delete"
@@ -51,7 +50,6 @@
         android:contentDescription="@string/delete"
         android:padding="6dp"
         android:src="@drawable/ic_clear_all"
-        android:tint="@color/primaryText"
         android:tooltipText="@string/delete"
         app:layout_constraintBottom_toTopOf="@id/title_example"
         app:layout_constraintRight_toRightOf="parent"