LoopJ AndroidAsyncHttp -更多任务

Question

我想在一个活动中使用AsyncHttpClient完成更多任务(我需要通过REST从不同的网址获取和更新数据)。但我不知道该怎么处理。我的想法如下：

private class Synchronize extends AsyncTask<String, String, Boolean> {

    @Override
    protected void onPreExecute() {
        prgDialog.show();
    }

    protected Boolean doInBackground(String... params) {
        url = "http://someurl";
        AsyncHttpClient client = new AsyncHttpClient();
            client.post(getApplicationContext(), url, entity, "application/json", new AsyncHttpResponseHandler() {
                @Override
                public void onSuccess(String content) {
                    // do something
                }

                @Override
                public void onFailure(int code, Throwable error, String content) {
                    // do something
                }

            }); 

        url = "http//otherurl";
        client.get(url, new AsyncHttpResponseHandler() {
            @Override
            public void onSuccess(String response) {
                // do something
            }

            @Override
            public void onFailure(int code, Throwable error, String content) {
                // do something
            }
        });

        return true;
    }

    @Override
    protected void onPostExecute(Boolean b) {
        super.onPostExecute(b);
        prgDialog.dismiss();
        // refresh view
    }
}

但我不确定我能不能这样做。谢谢你的建议。

Answer 1

如果您已经在使用AsyncHttp库，则可能不一定需要使用AsyncTask。我在前两个项目中所做的是从ResponceHandler类扩展并使用回调对其进行初始化。你可以从UI线程发出所有的请求，如果它们不相互依赖，并在回调中处理，ui的东西或发出下一个从回调，但它应该是同步的。下面是一些例子：

public class TrainersJsonHandler extends BaseJsonHttpResponseHandler {

    private OnGetTrainers mCallback;

    private Context mContext;

    private ObjectMapper mMapper;

    public TrainersJsonHandler(OnGetTrainers callback, Context context,
            ObjectMapper mapper) {
        mCallback = callback;
        mContext = context;
        mMapper = mapper;
    }

    @Override
    public void onSuccess(int statusCode, Header[] headers, String rawResponse,
            Object response) {
    }

    @Override
    public void onFailure(int statusCode, Header[] headers, Throwable e, String rawData,
            Object errorResponse) {
        RestUtil.processFail(statusCode, headers, e, mContext, mCallback);
    }

    @Override
    protected Object parseResponse(String responseBody) throws JSONException {
        List<Trainer> result = parseTrainers(responseBody);
        if (result != null && mCallback != null) {
            mCallback.onFinishGetTrainers(result);
        }
        return null;
    }


    public List<Trainer> parseTrainers(String responseBody) {...}
}

在activity中，我实现了接口，并做了如下操作：

    @Override
            public void onFinishGetTrainers(final List<Trainer> trainers) {
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        //do ui staff
                       //you can make here new request or refresh counter but should be synchronize
                    }
                });
            }

希望能有所帮助。