Android webview untold stories

Without any doubts, Android SDK has a poor documentations. There are pitfalls and traps about APIs without any mentions In SDK documentations.

1. webview. clearhistory ()

When there is only one item in webview's internal back/forward list, clearhistory () won't clear anything. when there are more than one items in back/forward list, clearhistory () will clear all the items before t the top one, or the current one.

The next question you might ask is when webview adds an item to its back/forward list when loading a URL. by listening webchromeclient. onprogresschanged (), we can know this, when new progress is bigger than 10, the loading URL will be added to its back/forward list. so when new progress is bigger than 10, loading URL becomes current item and thus you can clear previous loaded URLs by calling clearhistory ().