连接到网站JSOUP项目的错误(方法连接(String)对于类型JSOUP不确定)

Question

我想从网站获取数据到我的Android应用，因此我使用了JSOUP。

   Document document = Jsoup.connect(url).get(); 

在我项目的这一行中的错误。我在上面三个时使用以上行作为我的要求，但在所有三个时间都使用上述行，所有三行都显示错误消息。帮助如何删除此错误。

如果有人知道从动态网站数据到Android应用程序获取（获取）数据的其他简单方法/方法也请提及以这种方式提及。

    public class Jsoup extends Activity{
    // URL Address
    String url = "http://www.vogella.com/tutorials/Android/article.html";
    ProgressDialog mProgressDialog;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // Locate the Buttons in activity_main.xml
        Button titlebutton = (Button) findViewById(R.id.titlebutton);
        Button descbutton = (Button) findViewById(R.id.descbutton);
        Button logobutton = (Button) findViewById(R.id.logobutton);
        // Capture button click
        titlebutton.setOnClickListener(new OnClickListener() {
            public void onClick(View arg0) {
                // Execute Title AsyncTask
                new Title().execute();
            }
        });
        // Capture button click
        descbutton.setOnClickListener(new OnClickListener() {
            public void onClick(View arg0) {
                // Execute Description AsyncTask
                new Description().execute();
            }
        });
        // Capture button click
        logobutton.setOnClickListener(new OnClickListener() {
            public void onClick(View arg0) {
                // Execute Logo AsyncTask
                new Logo().execute();
            }
        });
    }
    // Title AsyncTask
    private class Title extends AsyncTask<Void, Void, Void> {
        String title;
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            mProgressDialog = new ProgressDialog(Jsoup.this);
            mProgressDialog.setTitle("Android Basic JSoup Tutorial");
            mProgressDialog.setMessage("Loading...");
            mProgressDialog.setIndeterminate(false);
            mProgressDialog.show();
        }
        @Override
        protected Void doInBackground(Void... params) {
            try {
                // Connect to the web site
                Document document = Jsoup.connect(url).get();
                // Get the html document title
                title = document.title();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return null;
        }
        @Override
        protected void onPostExecute(Void result) {
            // Set title into TextView
            TextView txttitle = (TextView) findViewById(R.id.titletxt);
            txttitle.setText(title);
            mProgressDialog.dismiss();
        }
    }
    // Description AsyncTask
    private class Description extends AsyncTask<Void, Void, Void> {
        String desc;
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            mProgressDialog = new ProgressDialog(Jsoup.this);
            mProgressDialog.setTitle("Android Basic JSoup Tutorial");
            mProgressDialog.setMessage("Loading...");
            mProgressDialog.setIndeterminate(false);
            mProgressDialog.show();
        }
        @Override
        protected Void doInBackground(Void... params) {
            try {
                // Connect to the web site
                Document document = Jsoup.connect(url).get();
                // Using Elements to get the Meta data
                Elements description = document
                        .select("meta[name=description]");
                // Locate the content attribute
                desc = description.attr("content");
            } catch (IOException e) {
                e.printStackTrace();
            }
            return null;
        }
        @Override
        protected void onPostExecute(Void result) {
            // Set description into TextView
            TextView txtdesc = (TextView) findViewById(R.id.desctxt);
            txtdesc.setText(desc);
            mProgressDialog.dismiss();
        }
    }
    // Logo AsyncTask
    private class Logo extends AsyncTask<Void, Void, Void> {
        Bitmap bitmap;
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            mProgressDialog = new ProgressDialog(Jsoup.this);
            mProgressDialog.setTitle("Android Basic JSoup Tutorial");
            mProgressDialog.setMessage("Loading...");
            mProgressDialog.setIndeterminate(false);
            mProgressDialog.show();
        }
        @Override
        protected Void doInBackground(Void... params) {
            try {
                // Connect to the web site
                Document document = Jsoup.connect(url).get();
                // Using Elements to get the class data
                Elements img = document.select("a[class=brand brand-image] img[src]");
                // Locate the src attribute
                String imgSrc = img.attr("src");
                // Download image from URL
                InputStream input = new java.net.URL(imgSrc).openStream();
                // Decode Bitmap
                bitmap = BitmapFactory.decodeStream(input);
            } catch (IOException e) {
                e.printStackTrace();
            }
            return null;
        }
        @Override
        protected void onPostExecute(Void result) {
            // Set downloaded image into ImageView
            ImageView logoimg = (ImageView) findViewById(R.id.logo);
            logoimg.setImageBitmap(bitmap);
            mProgressDialog.dismiss();
        }
    }

}

Answer 1

您不应该将类命名与已经存在的类相同的方式，因为编译器会将简化名称的每个呼叫连接到当前类，而不是从Imports中连接到类。例如

class String {
    public static void main(String[] args) {
        System.out.println(String.valueOf("1"));
    }
}

不会编译，因为String.valueOf不会尝试从java.lang.String调用valueOf，而是从您的类中，并且由于没有这样的方法方法不确定。

所以更改班级的名称

public class Jsoup extends Activity{
    ...{
        Document document = Jsoup.connect(url).get(); 
    }
}

更像

的东西

public class JsoupActivity extends Activity{
//           ^^^^^^^^^^^^^
    ...{
        Document document = Jsoup.connect(url).get(); 
    }
}