Question

我想从网站获取数据到我的Android应用程序，所以我使用了jsoup。

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

在我的project.i的这一行中出现

错误。我使用上面的第三行作为我的要求，但是使用上面这一行的所有三次都是三次显示错误消息。帮助如何删除此错误..

如果有人知道任何其他简单的方法/方法从动态网站数据获取（获取）数据到Android应用程序，请提及这种方式..

    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

您不应该以与现有类相同的方式命名您的类，因为编译器会将每个简化名称的调用连接到当前类，而不是从导入类连接到类。例如

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

将无法编译，因为String.valueOf不会尝试从valueOf调用java.lang.String，而是从 您的班级 调用public class Jsoup extends Activity{ ...{ Document document = Jsoup.connect(url).get(); } }是没有这样的方法，你看到错误说这种方法是未定义的。

因此，更改班级名称

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

更像是

Install-Package : Could not install package 'Microsoft.AspNet.Razor 3.2.3'. You are trying to install this packag
e into a project that targets '.NETFramework,Version=v4.0', but the package does not contain any assembly referen
ces or content files that are compatible with that framework. For more information, contact the package author.
At line:1 char:1
+ Install-Package Microsoft.AspNet.Mvc -Version 5.2.3
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Install-Package], InvalidOperationException
    + FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PowerShell.Commands.InstallPackageCommand

连接到网站jsoup项目时出错（对于Jsoup类型，方法connect（String）未定义）

1 个答案: