Android工作室progressDialog在asynctask

Question

我在这里的第一篇文章，所以如果它在错误的地方，或者如果我有一两件事情错了，请原谅。此外，我是一个认真的初学者，所以假设我知道的很少。 谢谢... 我正在Android工作室创建一个简单的应用程序，我试图在在线服务器上注册用户。 我得到它的工作（它注册用户在服务器上），但现在我试图添加进度对话框，以便当应用程序连接到服务器时，这将显示。 我下面的代码似乎工作 - 然后在对话框消失，出现直线距离，但最后我得到一个消息说：“不幸的是登录登录注册已停止”

任何想法有什么错我的代码...这里是

package com.example.android.loginregister; 

import android.app.AlertDialog; 
import android.app.ProgressDialog; 
import android.content.Context; 
import android.os.AsyncTask; 
import android.widget.Toast; 

import java.io.BufferedReader; 
import java.io.BufferedWriter; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.io.OutputStream; 
import java.io.OutputStreamWriter; 
import java.net.HttpURLConnection; 
import java.net.MalformedURLException; 
import java.net.URL; 
import java.net.URLEncoder; 

/** 
* Created by Jon on 2015/09/15. 
*/ 

public class BackgroundTask extends AsyncTask<String, Integer, String> { 

    //declares a context variable 
    Context ctx; 

    //declares an alert dialog object 
    AlertDialog alertDialog; 
    ProgressDialog progressDialog; 

    //declare constructor will need to be passed a context 
    BackgroundTask(Context ctx){ 
     this.ctx = ctx; 
     progressDialog = new ProgressDialog(ctx); 
    } 

    //in this me`enter code here`thod (which happens before execution of the object) the alert dialog object is instantiated 
    @Override 
    protected void onPreExecute() { 
     alertDialog = new AlertDialog.Builder(ctx).create(); 
     alertDialog.setTitle("Login Information...."); 

     progressDialog.setCancelable(false); 
     progressDialog.setTitle("Processing"); 
     progressDialog.setMessage("Please wait..."); 
     progressDialog.setIndeterminate(true); 
     progressDialog.show(); 
    } 

    @Override 
    protected String doInBackground(String... params) { 

     //set up url connections 
     String reg_url = "http://jontestdb.webege.com/register.php"; 
     String login_url = "http://jontestdb.webege.com/login.php"; 
     String method = params[0]; 

     if (method.equals("register")){ 
      String name = params[1]; 
      String user_name = params[2]; 
      String user_pass = params[3]; 

      try { 

       URL url = new URL(reg_url); 
       HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection(); 
       httpURLConnection.setRequestMethod("POST"); 
       httpURLConnection.setDoOutput(true); 
       OutputStream OS = httpURLConnection.getOutputStream(); 
       BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(OS, "UTF-8")); 

       String data = URLEncoder.encode("user", "UTF-8") + "=" + URLEncoder.encode(name, "UTF-8") +"&"+ 
       URLEncoder.encode("user_name", "UTF-8") + "=" + URLEncoder.encode(user_name, "UTF-8") +"&"+ 
       URLEncoder.encode("user_pass", "UTF-8") + "=" + URLEncoder.encode(user_pass, "UTF-8"); 

       bufferedWriter.write(data); 

       bufferedWriter.flush(); 
       bufferedWriter.close(); 
       OS.close(); 

       InputStream IS = httpURLConnection.getInputStream(); 
       IS.close(); 

       return "Registration success..."; 

      } catch (MalformedURLException e){ 
       e.printStackTrace(); 
      } catch (IOException e) { 
       e.printStackTrace(); 
      } ; 
     } 
     else if(method.equals("login")){ 

      String login_name = params[1]; 
      String login_pass = params[2]; 

      try { 
       URL url = new URL(login_url); 
       HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection(); 

       //defines communication method 
       httpURLConnection.setRequestMethod("POST"); 

       //need to send info to the server 
       httpURLConnection.setDoOutput(true); 

       //gets response from server 
       httpURLConnection.setDoInput(true); 

       //now need to get output stream from connection so first create output stream object 
       OutputStream outputStream = httpURLConnection.getOutputStream(); 

       BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8")); 

       //need to specify data - used the post method so have to encode data 
       String data = URLEncoder.encode("login_name", "UTF-8")+"="+URLEncoder.encode(login_name, "UTF-8")+"&"+ 
       URLEncoder.encode("login_pass", "UTF-8")+"="+URLEncoder.encode(login_pass, "UTF-8"); 

       bufferedWriter.write(data); 
       bufferedWriter.flush(); 
       bufferedWriter.close(); 

       outputStream.close(); 

       //get response from server 
       InputStream inputStream = httpURLConnection.getInputStream(); 

       //need buffered reader now 
       BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, "iso-8859-1")); 

       //now need to get information from bufferedreader 
       String response = ""; 
       String line = ""; 

       //this is saying that if buffered reader.read line is not null then get the info from buffered reader 
       //the data obtained from the read line method and stored in the line variable is the added the response variable 
       //seems as though bufferedreader contains the query result 
       while ((line = bufferedReader.readLine()) != null){ 
        response += line; 
       } 
       bufferedReader.close(); 
       inputStream.close(); 
       httpURLConnection.disconnect(); 

       //this returns the response which should be the name of the user 
       return response; 

      } catch (MalformedURLException e) { 
       e.printStackTrace(); 
      } catch (IOException e) { 
       e.printStackTrace(); 
      } 

     } 

     return null; 
    } 

    @Override 
    protected void onProgressUpdate(Integer... values) { 

     super.onProgressUpdate(values); 
    } 

    @Override 
    protected void onPostExecute(String result) { 



     if (result.equals("Registration success...")) { 
      Toast.makeText(ctx, result, Toast.LENGTH_LONG).show(); 
     } 
     else{ 
      alertDialog.setMessage(result); 
      alertDialog.show(); 
     } 

     if (progressDialog != null){ 
      progressDialog.dismiss();} 
    } 
} 

Answer 1

我更喜欢用乱射我imlementation是下一个：

 RequestQueue queue = Volley.newRequestQueue(this); 
     String url ="http://ejemplo.com/funciones_php/ServicioRest.php?Func=DispConocido&IdDispositivo="+text; 

     StringRequest stringRequest = new StringRequest(Request.Method.GET, url, 
       new Response.Listener<String>() { 
        @Override 
        public void onResponse(String response) { 
         progress = ProgressDialog.show(Principal.this, "Cargando", "Espere unos segundos", true); 
         final String r = response; 
         // Ejecuta el codigo despues de 1.5 segundos 
         Handler handler = new Handler(); 
         handler.postDelayed(new Runnable() { 
          public void run() { 
           //Your source here 
          } 
         }, 1500); 

         /*Context context = getApplicationContext(); 
         int duration = Toast.LENGTH_LONG; 
         Toast toast = Toast.makeText(context, response, duration); 
         toast.show();*/ 
        } 
       }, new Response.ErrorListener() { 
      @Override 
      public void onErrorResponse(VolleyError error) { 

      } 
     }); 

//添加请求，请求队列。 queue.add（stringRequest）;