RecyclerView 添加Webview为headerView

设置如下代码即可解决webview的大小问题：

 private void setupWebView() {
        webView.getSettings().setJavaScriptEnabled(true);
        webView.setWebViewClient(new WebViewClient() {
            @Override
            public void onPageFinished(WebView view, String url) {
                webView.loadUrl("javascript:MyApp.resize(document.body.getBoundingClientRect().height)");
                super.onPageFinished(view, url);
            }
        });
        webView.addJavascriptInterface(this, "MyApp");
    }

    @JavascriptInterface
    public void resize(final float height) {
        ((Activity) getContext()).runOnUiThread(new Runnable() {
            @Override
            public void run() {
                webView.setLayoutParams(new LinearLayout.LayoutParams(getResources().getDisplayMetrics().widthPixels, (int) (height * getResources().getDisplayMetrics().density)));
            }
        });
    }