如何清除网页视图的历史记录?

问题描述

Webview的历史记录尚未清除...下面的代码有什么问题?

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

创建Web视图

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

单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

您无法在webview加载页面(url)时清除历史记录，以便按如下方式清除onPageFinished侦听器的历史记录设置

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，当您声明mWebViewReport时，请进行设置

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，当您调用要清除历史记录的帮助URL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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