当我在 Android Studio 中将一个页面导航到另一个页面时，如何从 WebView 中删除导航？

Question

//宣言

public class DealerLoginActivity extends AppCompatActivity {
    WebView webView;
    ProgressBar progressBar;
    AdView mAdView;
    String url = "http://farmech.bih.nic.in/FMNEW/MDealerLoginNew.aspx";

// 初始化

    @SuppressLint("SetJavaScriptEnabled")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_dealer_login);
        webView = findViewById(R.id.web_views);
        new MyAsynTask().execute();

        progressBar = findViewById(R.id.progress_login);
        WebSettings webSettings = webView.getSettings();
        webSettings.setJavaScriptEnabled(true);
        webView.getSettings().setBuiltInZoomControls(true);

        AdView adView = new AdView(this);
        adView.setAdSize(AdSize.BANNER);
        adView.setAdUnitId("ca-app-pub-7657536360406007/9152366791");

        MobileAds.initialize(this, new OnInitializationCompleteListener() {
            @Override
            public void onInitializationComplete(InitializationStatus initializationStatus) {
            }
        });
        mAdView = findViewById(R.id.adView);
        AdRequest adRequest = new AdRequest.Builder().build();
        mAdView.loadAd(adRequest);
    }

// 使用 Jsoup 库移除页眉、导航和页脚。

    @SuppressLint("StaticFieldLeak")
    private class MyAsynTask extends AsyncTask<Void, Void, Document> {
        @Override
        protected Document doInBackground(Void... voids) {

            Document document = null;
            try {
                document = Jsoup.connect(url).get();
                document.getElementsByTag("header").remove();
                document.getElementsByTag("nav").remove();
                document.getElementsByTag("footer").remove();

            } catch (IOException e) {
                e.printStackTrace();
            }
            return document;
        }

//后台任务成功后执行后显示所有数据。

        @Override
        protected void onPostExecute(final Document document) {
            super.onPostExecute(document);
            webView.loadDataWithBaseURL(url, document.toString(), "text/html", "utf-8", "");
            webView.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
            webView.setWebViewClient(new WebViewClient() {
                @Override
                public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request) {
                    return true;
                }

                @Override
        public void onPageFinished(WebView view, String url) {

            super.onPageFinished(view, url);

            progressBar.setVisibility(View.GONE);
        }
            });

        }
    }

}

// 此代码适用于打开 Url，没有显示任何页脚、页眉和导航，( https://i.stack.imgur.com/j3ZIp.jpg ) 但在点击提交或任何其他可用链接后在 WebView(url) 然后它会显示页眉、导航和页脚 ( https://i.stack.imgur.com/ByAgz.jpg ) 我该如何解决这个问题.....如何从 webview 中删除永久删除

Answer 1

可能有一种方法可以覆盖onPageFinished方法并注入 javascript 以删除这些 html 元素。

 @Override
    public void onPageFinished(WebView view, String url) {
       view.loadUrl("javascript:var footer = document.getElementById(\"footer\"); footer.parentNode.removeChild(footer); var header = document.getElementById(\"header\"); header.parentNode.removeChild(header);");
    }

并确保您已启用 javascript

webSettings.setJavaScriptEnabled(true);