WebViewClient提供用于捕获各种事件的钩子，这些事件包括页面加载开始和结束、表单重新提交、键盘截取以及程序员喜欢跟踪并操纵的很多其他事件。

The WebViewClient provides hooks for capturing various events such as page load start and end, form re-submission, keyboard intercepting, and many other events programmers love to trap and manipulate.

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