與loopj Android Asynchronous Http Client同步調用

Question

我試圖在loopj上使用setUseSynchronousMode來等待http調用的結果，然后繼續一個案例。 我試過了：

    AsyncHttpResponseHandler responseHandler = new AsyncHttpResponseHandler() {
        @Override
        public void onSuccess(int statusCode, Header[] headers, byte[] response) {
            Log.d("TEST", "Got results");
        }
    };

    AsyncHttpClient client = new AsyncHttpClient();
    responseHandler.setUseSynchronousMode(true);
    client.get("http://www.google.com", responseHandler);
    Log.d("TEST", "Don't want to get here until after getting results");

但結果是：

07-11 19:48:05.631 D/TEST﹕ Don't want to get here until after getting results
07-11 19:48:05.814 D/TEST﹕ Got results

我誤解了setUseSynchronousMode應該做什么？

Answer 1

您應該使用SyncHttpClient而不是AsyncHttpClient 。 setUseSynchronousMode不具有預期的效果AsyncHttpClient 。

Answer 2

要使AsyncHttpClient同步版本能夠取消它，我會在主線程上執行所有操作。 以前我在AsyncTask中運行它，一旦調用AsyncHttpClient.post() ， AsyncTask就會完成，我無法跟蹤AsyncHttpClient實例。

SyncHttpClient不允許我取消上傳，所以我知道我必須使用AsyncHttpClient並進行適當的更改。

以下是我上傳使用AsyncHttpClient並允許取消的文件的類：

public class AsyncUploader {
    private String mTitle;
    private String mPath;
    private Callback mCallback;

    public void AsyncUploader(String title, String filePath, MyCallback callback) {
        mTitle = title;
        mPath = filePath;
        mCallback = callback;
    }

    public void startTransfer() {
        mClient = new AsyncHttpClient();
        RequestParams params = new RequestParams();
        File file = new File(mPath);
        try {
            params.put("title", mTitle);
            params.put("video", file);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        mClient.setTimeout(50000);
        mClient.post(mContext, mUrl, params, new ResponseHandlerInterface() {
            @Override
            public void sendResponseMessage(HttpResponse response) throws IOException {
                HttpEntity entity = response.getEntity();
                if (entity != null) {
                    InputStream instream = entity.getContent();
                    // TODO convert instream to JSONObject and do whatever you need to
                    mCallback.uploadComplete();
                }
            }
            @Override
            public void sendProgressMessage(int bytesWritten, int bytesTotal) {
                mCallback.progressUpdate(bytesWritten, bytesTotal);
            }
            @Override
            public void sendFailureMessage(int statusCode, Header[] headers, byte[] responseBody, Throwable error) {
                mCallback.failedWithError(error.getMessage());
            }
        });
    }

    /**
    * Cancel upload by calling this method
    */
    public void cancel() {
        mClient.cancelAllRequests(true);
    }
}

這是你如何運行它：

AsyncUploader uploader = new AsyncUploader(myTitle, myFilePath, myCallback);
uploader.startTransfer();
/* Transfer started */
/* Upon completion, myCallback.uploadComplete() will be called */

要取消上傳，只需調用cancel()如：

uploader.cancel();