问如何在android应用程序中在线和离线模式下加载或检索网页？

EN

WebViewClient webViewClient = new WebViewClient() {
    @TargetApi(VERSION_CODES.LOLLIPOP)
    @Override
    public WebResourceResponse shouldInterceptRequest(WebView view, WebResourceRequest request) {
        WebResourceResponse response = null;
        if ("GET".equals(request.getMethod())) {
            try {
                response = getWebResponse(view.getContext().getApplicationContext(), request.getUrl().toString());
            } catch (Exception e) {
                Log.e(TAG, "Error while overriding getting web response", e);
            }
        }
        return response;
    }

    @SuppressWarnings("deprecation")
    @Override
    public WebResourceResponse shouldInterceptRequest(WebView view, String url) {
        WebResourceResponse response = null;
        try {
            response = getWebResponse(view.getContext().getApplicationContext(), url);
        } catch (Exception e) {
            Log.e(TAG, "Error while overriding getting web response", e);
        }
        return response;
    }

    WebResourceResponse getWebResponse(Context context, String url) {
        // YOUR IMPLEMENTATION that will save resource located at passed url
    }
}
webView.setWebViewClient(webViewClient);