Custom Views is just a way to make an android developer a painter. When you need to create some custom and reuse the views when it is not provided by the Android Ecosystem. Custom Views can be used as widgets like TextView, EditText etc.
Create your own Custom View - MindOrks
blog.mindorks.com > create-your-own-custom-view
How do you activate a Custom View in Excel?
1. Go to the View tab and Custom Views, and then select the view and Click Show.
2. Right click the worksheet tab and choose the view.
3. Go to the View tab and select the view from the Custom Views drop-down menu.
Quiz | Custom Views | Microsoft Excel - Basic & Advanced - GoSkills www.goskills.com > Course > Excel > Lesson > Custom-Views > Quiz
Creating custom views. By extending the View class or one of its subclasses you can create your custom view. For drawing view use the onDraw() method. In this method you receive a Canvas object which allows you to perform drawing operations on it, e.g. draw lines, circle, text or bitmaps.
Creating custom and compound views in Android - Tutorial - vogella.com
www.vogella.com > tutorials > AndroidCustomViews > article
Look at the row of worksheet tabs on the bottom of your Excel screen, or look at the name of the file in the title bar of the application. If two tabs are both highlighted, or if "[Group]" appears after the filename, you have multiple tabs selected. This will prevent the Custom View option from working.
Why Is Custom View in Excel Disabled? - Small Business - Chron.com
smallbusiness.chron.com > ... > Excellent Customer Service