如何清除的WebView历史的android [英] how to clear webview history in android

问题描述

的WebView的历史是不清除...有什么不对低于code？

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);

加载帮助文件时，帮助按钮，点击

Load help file when help button click

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

加载摘要文件时总结按钮点击

load Summary file when summary button click

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

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

在这里我可以看到的帮助页面太...

Here i can see the Help page too...

推荐答案

您可以一边web视图是为了清除历史记录设置onPageFinished监听如下加载网页（URL）无法清除历史记录

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

在之前的onCreate声明公共变种

declare a public var before the onCreate

boolean clearHistory = false;

现在，当你宣布你mWebViewReport设置此

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，当你打电话给你的帮助URL insted的结算刚刚成立clearHistory为true的历史

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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