当用户在 WebView Android 中按后退键时重定向的停止页面

Question

 public void onBackPressed (){
    WebView webview = (WebView) findViewById(R.id.mainWebView);
    if (webview.isFocused() && webview.canGoBack()) {
            webview.goBack();       
    }
    else {
            super.onBackPressed();
            finish();
    }
}
private class MyCustomWebViewClient extends WebViewClient {
    ProgressDialog progressDialog = new ProgressDialog(AndroidMobileAppSampleActivity.this);
    @Override
    public void onPageStarted(WebView view, String url, Bitmap favicon) {
        super.onPageStarted(view, url, favicon);
        progressDialog.setMessage("Processing");
        progressDialog.setCancelable(false);
        progressDialog.setOnKeyListener(new OnKeyListener(){
            @Override
            public boolean onKey(DialogInterface dialog, int keyCode,
                    KeyEvent event) {
                if(keyCode == KeyEvent.KEYCODE_SEARCH) {
                    return true;
                }
                else
                    return false;
            }});
        progressDialog.show();
    }

    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        progressDialog.setMessage("Processing");
        progressDialog.setCancelable(false);
        progressDialog.setOnKeyListener(new OnKeyListener(){
            @Override
            public boolean onKey(DialogInterface dialog, int keyCode,
                    KeyEvent event) {
                if(keyCode == KeyEvent.KEYCODE_SEARCH) {
                    return true;
                }
                else
                    return false;
            }});
        progressDialog.show();
        view.loadUrl(url);
        return true;
    }
    public void onPageFinished(WebView view, String url) {
        if (progressDialog.isShowing()) {
            progressDialog.dismiss();
        }
    }

}

这是我的代码，我正在 webview 中加载一个 url 并在用户重定向到另一个页面时显示处理对话框，现在我想停止我的页面重定向并在用户按后退键时隐藏处理对话框。我试过但没有成功，请帮忙。提前致谢

Answer 1

清除已完成页面加载的历史记录。没有回头史。

mWebView.setWebViewClient(new WebViewClient(){
    @Override
    public void onPageFinished(WebView view, String url) 
    {
        mWebView.clearHistory();
        super.onPageFinished(view, url);
    }
});