Question

这是我在这个网站上的第一篇文章，我的应用程序有问题，我无法找到我的应用程序停止的原因。我正在向Despegar发送请求以获得这些国家的json但发生了这些。如果你能帮助我，我会非常感激。这是我的代码：

public class MainActivity extends Activity {
final TextView txtResultado = (TextView) findViewById(R.id.txtResultado);
String JSONRequest;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    new TareaConexion().execute("http://api.despegar.com/countries");

}
class TareaConexion extends AsyncTask<String, Void, String>{

    protected void onPreExecute() {
    }

    protected String doInBackground(String... urls) {
        httpHandler httphandler = new httpHandler();
        JSONRequest = httphandler.Post(urls[0]);
        return JSONRequest;
    }

    protected void onProgressUpdate () {        
    }

    protected void onPostExecute() {
        txtResultado.setText(JSONRequest);
    }
 }

和类httpHandler：

public class httpHandler {

public String Post (String PostURL)
{
    try {

        HttpClient httpclient = new DefaultHttpClient(); 
        HttpPost httppost = new HttpPost(PostURL);

        HttpResponse resp = httpclient.execute(httppost); 
        HttpEntity ent = resp.getEntity();

        String Respuesta = EntityUtils.toString(ent); 

        return Respuesta;
    } catch (Exception e) {
        return "error";
    }
}
}

任何人都可以找到我的应用停止的原因吗？我做错了什么？

我是阿根廷人，请原谅我，如果我用语言，ajja犯了错误。感谢

Answer 1

试试此代码

    MyAsyncTask extends AsyncTask<String, Void, HttpResponse> 
    {
        @Override
            protected HttpResponse doInBackground(String... param) 
            {
                String url = param[0];

                HttpResponse response = null;
                HttpClient httpclient = new DefaultHttpClient();
                httpclient.getParams().setParameter("http.connection-manager.timeout", 15000);
                try {

                    if (type == Constants.TYPE_POST)
                    {
                        HttpPost httppost = new HttpPost(url);
                        response = httpclient.execute(httppost);
                    }
                    else if (type == Constants.TYPE_DELETE)
                    {
                        HttpDelete httpdelete = new HttpDelete(url);
                        response = httpclient.execute(httpdelete);
                    }           
                    else
                    {
                        HttpGet httppost = new HttpGet(url);
                        response = httpclient.execute(httppost);
                    }       

                } catch (ClientProtocolException es) 
                {   
                    Log.e("x" , es.getMessage());
                } catch (IOException e) 
                {
                    Log.e("aasx" , e.getMessage());
                }
                return response;

            }

            @Override
            protected void onPostExecute(HttpResponse response) 
            {
                if (response != null)
                {   
                      JSONObject obj = new JSONObject(Utilities.convertStreamToString(response.getEntity().getContent()));
                   //Whatever you want to do        
                }
            }
        }

Android：如何在AsyncTasks中使用webservices

1 个答案: