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.
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。
When the user does something an event takes place. There are also some events that aren't directly caused by the user: the load event that fires when a page has been loaded, for instance.
当用户做了什么事情event就发生了，当然还有一些event不会直接被用户触发：比如load事件会在页面装载完毕的时候触发。
When the user does something an event takes place. There are also some events that aren't directly caused by the user: the load event that fires when a page has been loaded, for instance.
当用户做了什么事情event就发生了，当然还有一些event不会直接被用户触发：比如load事件会在页面装载完毕的时候触发。
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