android webview按返回键一直加载当前页面

当前页面是重定向的，监听返回键调用webview.goback()，就一直加载当前页面
处理方式是，http开头的url，用super.shouldOverrideUrlLoading(view, request)处理
非http开头的，用intent处理

private String currentUrl = "";
mWebview.setWebViewClient(new MyWebViewClient());
private class MyWebViewClient extends WebViewClient {
        @Override
        public void onPageStarted(WebView view, String url, Bitmap favicon) {
            super.onPageStarted(view, url, favicon);
            currentUrl = url;
        }

        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            if(loadUrl(view, url)){
                return true;
            }
            return super.shouldOverrideUrlLoading(view, url);
        }

        @Override
        public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request) {
            String url = String.valueOf(request.getUrl());
            if(loadUrl(view, url)){
                return true;
            }
            return super.shouldOverrideUrlLoading(view, request);
        }
    }
private boolean loadUrl(WebView view, String url){
        LogUtil.LogE("ZLWebPlatformActivity shouldOverrideUrlLoading " + url);
        if(url.startsWith("http")) {
            return false;
        }
        try{
            Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
            startActivity(intent);
        }catch (Exception e){
            e.printStackTrace();
        }
        return true;
    }