1

我有一个 AsyncTask 将图像上传到我的服务器。这部分工作正常，但我不知道如何处理中止过程。我有一个可以取消的 ProgressDialog，以及一个取消监听器。在这个监听器中，我中止了 http 请求和 AsyncTask ......但似乎这还不够，因为图像仍在上传。这是我的代码的样子：

public class UploadCubeThread extends AsyncTask<Cube, Void, String> {

private static final String url = "http://www.mywebsite.com/upload_cube.php";
private volatile HttpPost httppost = new HttpPost(url);
private ProgressDialog waitSpinner;
private Context context;
private HashMap<String, Integer> feedback;
private boolean success = false;

public UploadCubeThread(Context context) {
    this.context = context;
    this.feedback = new HashMap<String, Integer>();
    waitSpinner = new ProgressDialog(context);
    // Cancelable
    waitSpinner.setCancelable(true);
    waitSpinner.setCanceledOnTouchOutside(false);
    waitSpinner.setOnCancelListener(new OnCancelListener() {
        public void onCancel(DialogInterface dialog) {
            httppost.abort();
            UploadCubeThread.this.cancel(true);
        }
    });
}

@Override
protected void onCancelled() {
    super.onCancelled();
    success = false;
    feedback.put("cancelled", 0);
    ((UploadListener) context).onUploadComplete(success, feedback);
}

@Override
protected void onPreExecute() {
    super.onPreExecute();
    waitSpinner.setMessage(context.getString(R.string.uploading));
    waitSpinner.show();
}

@Override
protected String doInBackground(Cube... arg0) {

    Cube cube = arg0[0];
    String result = null;
    ByteArrayOutputStream stream = new ByteArrayOutputStream();
    // Compression
    cube.getImage().compress(Bitmap.CompressFormat.JPEG, 100, stream);

    byte[] byte_arr = stream.toByteArray();
    String image_str = Base64.encodeBytes(byte_arr);
    ArrayList<BasicNameValuePair> nameValuePairs = new ArrayList<BasicNameValuePair>();
    // Hash md5 pour l'intégrité
    String hash = CubeUploader.encode(image_str);

    nameValuePairs.add(new BasicNameValuePair("image", image_str));
    nameValuePairs.add(new BasicNameValuePair("id_building", String
            .valueOf(cube.getId_building())));
    nameValuePairs.add(new BasicNameValuePair("title", cube.getTitle()));
    nameValuePairs
            .add(new BasicNameValuePair("content", cube.getContent()));
    nameValuePairs.add(new BasicNameValuePair("hash", hash));

    try {
        HttpClient httpclient = new DefaultHttpClient();
        httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs,
                HTTP.UTF_8));

        HttpResponse response = httpclient.execute(httppost);


        // Utilisation de la réponse
        BufferedReader reader = new BufferedReader(new InputStreamReader(
                response.getEntity().getContent(), "UTF-8"));
        result = reader.readLine();

    } catch (UnknownHostException he) {
        Log.e("CubeUpload", "Unknown Host : problem of connectivity ?");
        result = "host_pb";
    } catch (Exception e) {
        Log.e("CubeUpload", "Error during upload: " + e.toString());
    }
    return result;

}

@Override
protected void onPostExecute(String result) {
    super.onPostExecute(result);
//Some process
    ((UploadListener) context).onUploadComplete(success, feedback);
    waitSpinner.dismiss();
}
}

非常感谢您的帮助！

4

1 回答 1

0

我认为关键是这httppost.abort(); 还不够，连接没有完全关闭（这是我想要的，它将在服务器端处理）所以我尝试添加httpclient.getConnectionManager().shutdown();，但效果并不好，图像仍在上传！... 我不明白

于 2012-04-29T16:51:34.267 回答