Книга: Beginning Android

Settings, Preferences, and Options (Oh, My!)

Settings, Preferences, and Options (Oh, My!)

With your favorite desktop Web browser, you have some sort of “settings” or “preferences” or “options” window. Between that and the toolbar controls, you can tweak and twiddle the behavior of your browser, from preferred fonts to the behavior of Javascript.

Similarly, you can adjust the settings of your WebView widget as you see fit, via the WebSettings instance returned from calling the widget’s getSettings() method.

There are lots of options on WebSettings to play with. Most appear fairly esoteric (e.g., setFantasyFontFamily()). However, here are some that you may find more useful:

• Control the font sizing via setDefaultFontSize() (to use a point size) or setTextSize() (to use constants indicating relative sizes like LARGER and SMALLEST)

• Control Javascript via setJavaScriptEnabled() (to disable it outright) and setJavaScriptCanOpenWindowsAutomatically() (to merely stop it from opening pop-up windows)

• Control Web site rendering via setUserAgent() — 0 means the WebView gives the Web site a user-agent string that indicates it is a mobile browser, while 1 results in a user-agent string that suggests it is a desktop browser

The settings you change are not persistent, so you should store them somewhere (such as via the Android preferences engine) if you are allowing your users to determine the settings, versus hard-wiring the settings in your application.

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