Книга: Beginning Android
Navigating the Waters
Navigating the Waters
As previously mentioned, there is no navigation toolbar with the WebView widget. This allows you to use it in places where such a toolbar would be pointless and a waste of screen real estate. That being said, if you want to offer navigational capabilities, you can, but you have to supply the UI.
WebView offers ways to perform garden-variety browser navigation, including the following:
• reload() to refresh the currently-viewed Web page
• goBack() to go back one step in the browser history, and canGoBack() to determine if there is any history to go back to
• goForward() to go forward one step in the browser history, and canGoForward() to determine if there is any history to go forward to
• goBackOrForward() to go backward or forward in the browser history, where a negative number as an argument represents a count of steps to go backward, and a positive number represents how many steps to go forward
• canGoBackOrForward() to see if the browser can go backward or forward the stated number of steps (following the same positive/negative convention as goBackOrForward())
• clearCache() to clear the browser resource cache and clearHistory() to clear the browsing history
Оглавление книги
- 4.4.4 The Dispatcher
- About the author
- Chapter 7. The state machine
- Appendix E. Other resources and links
- Example NAT machine in theory
- The final stage of our NAT machine
- Compiling the user-land applications
- The conntrack entries
- Untracked connections and the raw table
- Basics of the iptables command
- Other debugging tools
- Setting up user specified chains in the filter table