Question

我已经遵循了一些我认为完全正确的指南和其他问题但是我有一个我无法解决的错误。

反对这一行

private class loadNotams extends AsyncTask<String, Void, Void> {

我收到此错误

MainActivity.loadNotams类型必须实现继承的抽象方法AsyncTask.doInBackground（String ...）

并反对这一行

protected Void doInBackground(String airfield) {

我收到此错误：

MainActivity.loadNotams类型的方法doInBackground（String）必须覆盖或实现超类型方法

这里的任何想法都是我的全部代码：

import java.io.IOException;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.TextView;

public class MainActivity extends Activity {

TextView testText;
Notam[] notamList = new Notam[100];

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    // Document doc = null;

    testText = (TextView) findViewById(R.id.textview);

    new loadNotams().execute("ybmk");
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

private class loadNotams extends AsyncTask<String, Void, Void> {

    @Override
    protected Void doInBackground(String airfield) {
        Document doc = null;

        try {
            doc = Jsoup
                    .connect(
                            "https://pilotweb.nas.faa.gov/PilotWeb/notamRetrievalByICAOAction.do?method=displayByICAOs")
                    .data("retrieveLocId", airfield)
                    .data("formatType", "ICAO")
                    .data("reportType", "REPORT")
                    .data("actionType", "notamRetrievalByICAOs")
                    // .userAgent("Mozilla")
                    // .cookie("auth", "token")
                    .timeout(3000).post();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        int counter = 0;
        Elements pre = doc.select("pre");

        for (Element link : pre) {

            // get the value from href attribute
            System.out.println("text : " + link.text());
            notamList[counter++] = new Notam(airfield, link.text()
                    .substring(0, 8), link.text().substring(11,
                    link.text().length()));

        }
        counter--;
        while (counter >= 0) {
            System.out.println("class : " + notamList[counter].identifier
                    + "#" + notamList[counter].notamText);
            counter--;
        }
        testText.setText(notamList[0].notamText);
        return null;
    }
}

}

Answer 1

更改

 protected Void doInBackground(String airfield)

到

 protected Void doInBackground(String... airfield)

或

 protected Void doInBackground(String[] airfield)

因为doInBackground（）方法需要字符串数组作为参数

也改为

   try {
        doc = Jsoup
                .connect(
                        "https://pilotweb.nas.faa.gov/PilotWeb/notamRetrievalByICAOAction.do?method=displayByICAOs")
                .data("retrieveLocId", airfield[0])
                .data("formatType", "ICAO")
                .data("reportType", "REPORT")
                .data("actionType", "notamRetrievalByICAOs")
                // .userAgent("Mozilla")
                // .cookie("auth", "token")
                .timeout(3000).post();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

Answer 2

使其成为可变参数方法

protected Void doInBackground(String... airfield)

Asynctask和doInBackground错误

2 个答案: