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我正在构建一个提示用户注册的应用程序。我有一个在后端运行的django-restful服务器，我正在尝试使用DefaultHttpClient类在 android 客户端上向我的服务器发出 HTTP 发布请求。我从用户那里收到电子邮件、用户名等，在按钮的 onClick 事件中，我创建了一个AsnycTask来执行请求。这是活动的代码：

registerButton.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View arg0) {
        String userName = usernameEditText.getText().toString();
        String email = emailEditText.getText().toString();
        String password = passwordEditText.getText().toString();

        if( userName != null && email != null && password != null) {
            new RegisterEventHandler().execute(userName , email , password);
        }
    }

});

  ....

    class RegisterEventHandler extends AsyncTask<String, Integer, Boolean> {

    @Override
    protected Boolean doInBackground(String... params) {            
        RequestHandler handler = new RequestHandler();
        return handler.register(params[0], params[1], params[2]);
    }

    @Override
    protected void onPostExecute(Boolean result) {
        super.onPostExecute(result);
        if( result ) {
            AlertDialog.Builder builder = new AlertDialog.Builder(getApplicationContext());
            builder.setTitle(R.string.RegisterSuccessfullTitle);
            builder.setMessage(R.string.RegisterSuccessfullMessage);
            builder.setPositiveButton(R.string.OK, new DialogInterface.OnClickListener() {                  

                @Override
                public void onClick(DialogInterface dialog, int which) {
                    Intent redirect = new Intent(getApplicationContext() , SmartMapMainActivity.class);
                    startActivity(redirect);
                }

            });

            builder.create().show();
        }
        else {
            AlertDialog.Builder builder = new AlertDialog.Builder(getApplicationContext());
            builder.setTitle(R.string.RegisterFailedTitle);
            builder.setMessage(R.string.RegisterFailedMessage);
            builder.create().show();
        }
    }       
}

RequestHandler 类：

public class RequestHandler {

public boolean register(String userName , String email , String password) {
    HttpClient httpClient = new DefaultHttpClient();
    HttpPost httpPost = new HttpPost("http://127.0.0.1/users/");

    try {
        JSONObject jsonObj = new JSONObject();
        jsonObj.put("username", userName);
        jsonObj.put("email", email);
        jsonObj.put("password", password);      

        StringEntity entity = new StringEntity(jsonObj.toString());
        entity.setContentType("application/json");
        httpPost.setEntity(entity);

        HttpResponse response = httpClient.execute(httpPost);
        if(response.getStatusLine().getStatusCode() == 200)
            return true;
        else
            return false;

    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    } catch (ClientProtocolException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    } catch (JSONException e) {
        e.printStackTrace();
    }

    return false;

}
}

问题是，DefaultHttpClient的 connManager(ClientConnectionManager) 始终为空，并且在HttpClient的execute()方法上，它总是抛出IOException。我尝试在我的活动中初始化DefaultHttpClient，而不是在 AsyncTask 的doInBackground方法中，但结果是一样的。

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