如何在 HttpURLConnection 中添加 AsyncTask?

How to add AsyncTask in an HttpURLConnection?(如何在 HttpURLConnection 中添加 AsyncTask?)

问题描述

我正在建立服务器连接，我的问题是我需要在我的代码上放置一个 AsyncTask，因为它在 sdk 版本 10 上不起作用.我不想使用 StrictMode.ThreadPolicy.

I'm establishing a server connection, my problem is that I need to put an AsyncTask on my code, because its not working in sdk version 10 up. I don't want to use the StrictMode.ThreadPolicy.

public class TestConnection extends Activity {

@Override
public void onCreate(Bundle cbundle) {
    super.onCreate(cbundle);

    ConnectivityManager aConnectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo aNetworkInfo = aConnectivityManager.getActiveNetworkInfo();
    if (aNetworkInfo != null && aNetworkInfo.isConnected()){
        Toast.makeText(this, "Internet Connected", Toast.LENGTH_LONG).show();
    }else{
        Toast.makeText(this, "Internet Connection Timeout", Toast.LENGTH_LONG).show();
    }


    URL aURL;
    /* Will be filled and displayed later. */
    String aString = null;

    /* We will show the data we read in a TextView. */
    TextView aTextView = new TextView(this);
    try {

        /* Define the URL we want to load data from. */
        aURL = new URL(
                "http://url");

        /* Open a connection to that URL. */
        final HttpURLConnection aHttpURLConnection = (HttpURLConnection) aURL.openConnection();

        /* Define InputStreams to read from the URLConnection. */
        InputStream aInputStream = aHttpURLConnection.getInputStream();
        BufferedInputStream aBufferedInputStream = new BufferedInputStream(
                aInputStream);

        /* Read bytes to the Buffer until there is nothing more to read(-1) */
        ByteArrayBuffer aByteArrayBuffer = new ByteArrayBuffer(50);
        int current = 0;
        while ((current = aBufferedInputStream.read()) != -1) {
            aByteArrayBuffer.append((byte) current);
        }


        /* Convert the Bytes read to a String. */
        aString = new String(aByteArrayBuffer.toByteArray());
    } catch (Exception aException) {

        /* On any Error we want to display it. */
        aString = aException.getMessage();
    }

    /* Show the String on the GUI. */
    aTextView.setText(aString);
    this.setContentView(aTextView);

}

}

推荐答案

private class ConnectionTask extends AsyncTask<String, Void, String>{
    @Override
    protected byte[] doInBackground(String... urls) {
            try {
    aURL = new URL(
            urls[0]);

    /* Open a connection to that URL. */
    final HttpURLConnection aHttpURLConnection = (HttpURLConnection) aURL.openConnection();

    /* Define InputStreams to read from the URLConnection. */
    InputStream aInputStream = aHttpURLConnection.getInputStream();
    BufferedInputStream aBufferedInputStream = new BufferedInputStream(
            aInputStream);

    /* Read bytes to the Buffer until there is nothing more to read(-1) */
    ByteArrayBuffer aByteArrayBuffer = new ByteArrayBuffer(50);
    int current = 0;
    while ((current = aBufferedInputStream.read()) != -1) {
        aByteArrayBuffer.append((byte) current);
    }


    /* Convert the Bytes read to a String. */
    aString = new String(aByteArrayBuffer.toByteArray());               } catch (IOException e) {
                Log.d(TAG, e.toString());
            }
        return aString;
    }

    @Override
    protected void onPostExecute(String result) {
               // result is what you got from your connection
aTextView.setText(result);

    }

}

如何称呼:

                        ConnectionTask task = new ConnectionTask();
                        String[] params = new String[2];
                        params[0] = url;
                        params[1] = somethingelseifneeded;
                        task.execute(params);

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