android：HostConnection :: get（）建立新的主机连接

Question

我对android很新，并试图下载网页内容。即使我的代码抛出了一个错误，我无法找到错误发生的位置以及如何解决它。

public class MainActivity extends AppCompatActivity {

    public class DataDownload extends AsyncTask<String,Void,String>{
        @Override
        protected String doInBackground(String... urls) {
            String result= "";
            URL url;
            HttpURLConnection urlConnection = null;

            try {
                url =  new URL(urls[0]);
                urlConnection = (HttpURLConnection)url.openConnection();
                InputStream in = urlConnection.getInputStream();
                InputStreamReader reader = new InputStreamReader(in);
                int data = reader.read();
                while(data != -1){
                    char current = (char) data;
                    result += current;
                    data =  reader.read();

                }
                return result;
            } catch (IOException e) {
                e.printStackTrace();
                return "Failed";

            }
        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        DataDownload task = new DataDownload();

        String result = null;

        try {

            result = task.execute("https://www.ecowebhosting.co.uk/").get();

        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (ExecutionException e) {
            e.printStackTrace();
        }
        Log.i("content",result); }

我收到此日志

 10-25 22:04:39.766: E/ActivityThread(2617): Failed to find provider info for com.google.android.apps.gsa.testing.ui.audio.recorded
 10-25 22:04:39.813: E/cutils-trace(8731): Error opening trace file: Permission denied (13)
 10-25 22:04:40.293: E/memtrack(8731): Couldn't  load memtrack module (No such file or directory)
 10-25 22:04:40.298: E/android.os.Debug(8731): failed to load memtrack module: -2
 10-25 22:04:40.385: E/NetworkScheduler.SR(2599): Invalid parameter app
 10-25 22:04:40.385: E/NetworkScheduler.SR(2599): Invalid package name :      Perhaps you didn't include a PendingIntent in the extras?
 10-25 22:04:40.500: E/Drive.UninstallOperation(2784): Package still      installed com.nejat.listviewdemo
 10-25 22:04:40.922: E/NetworkScheduler.SR(2599): Invalid parameter app
 10-25 22:04:40.922: E/NetworkScheduler.SR(2599): Invalid package name : Perhaps you didn't include a PendingIntent in the extras?
 10-25 22:04:43.103: E/cutils-trace(8780): Error opening trace file: Permission denied (13)
 10-25 22:04:43.389: E/memtrack(8780): Couldn't load memtrack module (No such file or directory)
 10-25 22:04:43.389: E/android.os.Debug(8780): failed to load memtrack module: -2
 10-25 22:05:33.724: E/SurfaceFlinger(1294): ro.sf.lcd_density must be defined as a build property
 10-25 22:05:33.724: E/SurfaceFlinger(1294): [ 10-25 22:05:33.730  8793: 8793 D/         ]
 10-25 22:05:33.724: E/SurfaceFlinger(1294): HostConnection::get() New Host Connection established 0x9ae3a4c0, tid 8793 

提前谢谢。