如何清除网页浏览历史记录? [英] How to clear webview history?

问题描述

webview的历史没有清除...下面的代码有什么问题?

The history of webview is not clearing... What is wrong with below code?

Web 视图创建

mWebViewReport=(WebView)findViewById(R.id.report_page);
mWebViewReport.setWebViewClient(new HelloWebViewClient());
mWebViewReport.getSettings().setBuiltInZoomControls(true);

点击帮助按钮时加载帮助文件

Load help file when help button click

mWebViewReport.loadUrl("file:///android_asset/help.html");
mWebViewReport.clearHistory();
mWebViewReport.clearCache(true);

点击摘要按钮时加载摘要文件

load Summary file when summary button click

  mWebViewReport.loadUrl("file:///android_asset/summary.html");

    //On back button click
     if (mWebViewReport.canGoBack()) {
            mWebViewReport.goBack();
            return ;
      }

在这里我也可以看到帮助页面...

Here i can see the Help page too...

推荐答案

你不能在 webview 加载页面(url)时清除历史记录，以便清除 onPageFinished 监听器的历史设置，如下

You can't clear history while the webview is loading a page (url) in order to clear the history setup onPageFinished listener as follows

在 onCreate 之前声明一个公共变量

declare a public var before the onCreate

boolean clearHistory = false;

现在当你声明你的 mWebViewReport 时设置它

now when you declare your mWebViewReport set this up

mWebViewReport.setWebViewClient(new WebViewClient(){

    @Override
    public void onPageFinished(WebView view, String url) 
    {
        if (clearHistory)
        {
            clearHistory = false;        
            mWebViewReport.clearHistory();
        }
            super.onPageFinished(view, url);
    }
});

现在，当您调用帮助 url 以清除历史记录时，只需将 clearHistory 设置为 true

Now when you call your help url insted of clearing the history just set clearHistory to true

mWebViewReport.loadUrl("file:///android_asset/help.html");
mWebViewReport.clearHistory();  // REMOVE THIS LINE
mWebViewReport.clearCache(true); // REMOVE THIS LINE
clearHistory = true; // ADD THIS LINE

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