Question

我从这里使用了一个progress spinner library。当我使用params AsyncTask<String, Integer, Double>使用实例时它工作正常它完美无缺，并在UI上显示Progress微调器。

我刚修改它，因为我需要JSONArray作为输出，所以我将其修改为AsyncTask<String, Integer, JSONArray>

停止显示Progres微调器。所以我尝试了虚拟publishProgress((Integer) ((i / count) * 100));它调用方法onProgressUpdate，但进度微调器未显示。

 AsyncTask<String, Integer, JSONArray> asynTask = new GetEmployeeDetails(MainActivity.this).execute("");
        try {
          response = asynTask.get();
        } catch (InterruptedException e) {
          e.printStackTrace();
        } catch (ExecutionException e) {
          e.printStackTrace();
        }
        Log.i("Resultz >>>>>>",response.toString());
      }

并实施为

public class GetEmployeeDetails extends AsyncTask<String, Integer, JSONArray>
implements OnCancelListener {
  ProgressHUD mProgressHUD;
  private int statusCode = 0;
  private Activity activity;

  public GetEmployeeDetails(MainActivity activity) {
    super();
    this.activity = activity;
  }

  @Override
  protected void onPreExecute() {
    mProgressHUD = ProgressHUD.show(activity, "Posting Data...", true, false,
        this);
    super.onPreExecute();
  }

  @Override
  protected JSONArray doInBackground(String... params) {
    JSONArray resultJSONArray = null;
    try {
      resultJSONArray = getData(params[0]);
    } catch (URISyntaxException e) {
      e.printStackTrace();
    } catch (ClientProtocolException e) {
      e.printStackTrace();
    } catch (JSONException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }
    return resultJSONArray;
  }

  protected void onPostExecute(JSONArray result) {
    // pb.setVisibility(View.GONE);
    mProgressHUD.dismiss();
    super.onPostExecute(result);
    showHTTPResponseMessage(statusCode);
  }

  protected void onProgressUpdate(Integer... progress) {
    // pb.setProgress(progress[0]);
    mProgressHUD.setMessage("Wait");
    super.onProgressUpdate(progress);
  }

  public JSONArray getData(String valueIWantToSend) throws JSONException,
  ClientProtocolException, IOException, URISyntaxException {

    URI url = new URI("http://10.10.9.101:9393/users");
    String result = "";

    int count = 20;
    long totalSize = 0;
    for (int i = 0; i < count; i++) {
        publishProgress((Integer) ((i / count) * 100));
        // Escape early if cancel() is called
        if (isCancelled()) break;
    }

    // create HttpClient
    HttpClient httpclient = new DefaultHttpClient();

    // make GET request to the given URL
    HttpResponse httpResponse = httpclient.execute(new HttpGet(url));

    // receive response as inputStream
    InputStream inputStream = httpResponse.getEntity().getContent();

    // convert inputstream to string
    if (inputStream != null) {
      result = convertInputStreamToString(inputStream);
      Log.i("Result >>>>> ", result);
    } else
      result = "Did not work!";

    StatusLine statusLine = httpResponse.getStatusLine();
    statusCode = statusLine.getStatusCode();
    Log.e("TAG", "HTTP Status Code: " + statusLine.getStatusCode());
    JSONArray jsonObject = new JSONArray(result.toString());
    return jsonObject;
  }

  @Override
  public void onCancel(DialogInterface arg0) {
    this.cancel(true);
    mProgressHUD.dismiss();
  }

  public void showHTTPResponseMessage(int messageCode) {
    if (messageCode == 200) {
      Toast.makeText(activity, "200 OOK Post Successfull", Toast.LENGTH_LONG)
      .show();
    }
    if (messageCode == 404) {
      Toast.makeText(activity, "404 Not Found. Check your posting server url",
          Toast.LENGTH_LONG).show();
    }
    if (messageCode == 500) {
      Toast.makeText(activity,
          "500 Internal Server Error. Sorry We will back Soon!!",
          Toast.LENGTH_LONG).show();
    } else if (messageCode == 0)
      Toast.makeText(activity, "WOOOOOOFFFF... Unknonwn error",
          Toast.LENGTH_LONG).show();
  }

  private static String convertInputStreamToString(InputStream inputStream)
      throws IOException {
    BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(
        inputStream));
    String line = "";
    String result = "";
    while ((line = bufferedReader.readLine()) != null)
      result += line;

    inputStream.close();
    return result;

  }

}

除了未显示的微调器之外，每件工作都很好，为什么？

Answer 1

您不应该使用response = asynTask.get();。因为它仍在等待响应，所以窗口无法附加。

您可以在onPostExecute（）中调用另一个方法，而不是使用get（），该方法负责根据响应执行操作。

进度条没有显示？

1 个答案: