如何从Android Java中的网页获取信息

香港专业教育学院一直试图从网页上获取信息成字符串到我的Android应用程序.我一直在使用这种方法.

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;


public class DownloadPage {

    private static int arraySize;

    public static int getArraySize() throws IOException {

        URL url = new URL("http://woah.x10host.com/randomfact2.php");

        HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
        InputStream in = new BufferedInputStream(urlConnection.getInputStream());
        BufferedReader br = new BufferedReader(new InputStreamReader(in, "UTF-8"));

        String size = br.readLine();

        arraySize = Integer.parseInt(size);

        return arraySize;
    }



}

我什至在我的AndroidManifest.xml文件中包含了权限

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

但是,我一直收到错误,我的应用程序无法启动.每当我调用方法或类时,它就会崩溃.

解决方法:

您似乎正在获取android.os.NetworkOnMainThreadException.
请尝试使用AsyncTask来获取该整数.

public class DownloadPage {

    private static int arraySize;

    public void getArraySize() throws IOException {

        new RetrieveInt().execute();
    }

    private class RetrieveInt extends AsyncTask<String, Void, Integer> {


        @Override
        protected Integer doInBackground(String ... params) {
            try {
                URL url = new URL("http://woah.x10host.com/randomfact2.php");

                HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
                InputStream in = new BufferedInputStream(urlConnection.getInputStream());
                BufferedReader br = new BufferedReader(new InputStreamReader(in, "UTF-8"));

                String size = br.readLine();

                arraySize = Integer.parseInt(size);


            } catch (Exception e) {
                //do something
            }
            return arraySize; // gets 18
        }


        protected void onPostExecute(Integer i) {

            // TODO: do something with the number
// You would get value of i == 18 here. This methods gets called after your doInBackground() with output.
            System.out.println(i); 
        }
    }


}

标签：webpage,bufferedreader,java,android
来源： https://codeday.me/bug/20191119/2039469.html