从网页获取文本到字符串 [英] Get text from web page to string

问题描述

我是 Android 新手，我想将网页中的整个文本转换为字符串.我发现了很多这样的问题，但正如我所说，我是 Android 新手，我不知道如何在我的应用程序中使用它们.我收到错误.只有一种方法我设法让它工作，它使用 WebView 和 JavaScript，而且速度慢得要命.有人可以告诉我一些其他方法来做到这一点或如何加速 WebView，因为我根本不使用它来查看内容.顺便说一句，我添加了以下代码来加速 WebView

I'm new to Android and I want to get the whole text from a web page to a string. I found a lot of questions like this but as I said I'm new to Android and I don't know how to use them in my app. I'm getting errors. Only one method I managed to get it to work, it uses WebView, and JavaScript and it is slow as hell. Can someone please tell me some other way to do this or how to speed up the WebView since I don't use it at all for viewing content. By the way, I've added the following code to speed up WebView

webView.getSettings().setJavaScriptEnabled(true); 
    webView.getSettings().setBlockNetworkImage(true);
    webView.getSettings().setJavaScriptCanOpenWindowsAutomatically(false);
    webView.getSettings().setPluginsEnabled(false);
    webView.getSettings().setSupportMultipleWindows(false);
    webView.getSettings().setSupportZoom(false);
    webView.getSettings().setSavePassword(false);
    webView.setVerticalScrollBarEnabled(false);
    webView.setHorizontalScrollBarEnabled(false);
    webView.getSettings().setAppCacheEnabled(false);
    webView.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);

如果您知道其他比使用 WebView 更好更快的解决方案，请给我主要活动的完整源代码或解释我应该在哪里编写它，这样我就不会出错.

And please if you know other better and faster solution than using WebView please give me the whole source code of main activity or explain where I'm supposed to write it so I don't get errors.

推荐答案

Use This:

public class ReadWebpageAsyncTask extends Activity {
    private TextView textView;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        textView = (TextView) findViewById(R.id.TextView01);
    }

    private class DownloadWebPageTask extends AsyncTask<String, Void, String> {
        @Override
        protected String doInBackground(String... urls) {
            String response = "";
            for (String url : urls) {
                DefaultHttpClient client = new DefaultHttpClient();
                HttpGet httpGet = new HttpGet(url);
                try {
                    HttpResponse execute = client.execute(httpGet);
                    InputStream content = execute.getEntity().getContent();

                    BufferedReader buffer = new BufferedReader(
                            new InputStreamReader(content));
                    String s = "";
                    while ((s = buffer.readLine()) != null) {
                        response += s;
                    }

                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
            return response;
        }

        @Override
        protected void onPostExecute(String result) {
            textView.setText(Html.fromHtml(result));
        }
    }

    public void readWebpage(View view) {
        DownloadWebPageTask task = new DownloadWebPageTask();
        task.execute(new String[] { "http://www.google.com" });

    }
}

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >

    <Button android:layout_height="wrap_content" android:layout_width="match_parent" android:id="@+id/readWebpage" android:onClick="readWebpage" android:text="Load Webpage"></Button>
    <TextView android:id="@+id/TextView01" android:layout_width="match_parent" android:layout_height="match_parent" android:text="Example Text"></TextView>
</LinearLayout>

这篇关于从网页获取文本到字符串的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！