登录页面不显示进度条

Question

登录前我设置的进度条不显示。我尝试了很多组合，但仍然无法正常工作。请帮助我，我的工作是在这个线上。我的老板会杀了我。

import java.util.ArrayList; 
import java.util.List; 

import org.apache.http.HttpResponse; 
import org.apache.http.NameValuePair; 
import org.apache.http.client.HttpClient; 
import org.apache.http.client.ResponseHandler; 
import org.apache.http.client.entity.UrlEncodedFormEntity; 
import org.apache.http.client.methods.HttpPost; 
import org.apache.http.impl.client.BasicResponseHandler; 
import org.apache.http.impl.client.DefaultHttpClient; 
import org.apache.http.message.BasicNameValuePair; 
import org.json.JSONException; 
import org.json.JSONObject; 

import android.support.v7.app.ActionBarActivity; 
import android.app.Activity; 
import android.app.AlertDialog; 
import android.app.ProgressDialog; 
import android.content.DialogInterface; 
import android.content.Intent; 
import android.content.SharedPreferences; 
import android.os.AsyncTask; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.view.Window; 
import android.view.WindowManager; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.TextView; 
import android.widget.Toast; 


public class MainActivity extends Activity { 
Button login_b1; 
private EditText user, pass; 
private HandleJSON obj; 
String passStr=""; 
String uname=""; 
String status=""; 
SharedPreferences SP; 
String key; 
public static String getUrlData= new Sql_connect().url(); 
// Progress Dialog 
private ProgressDialog mProgressDialog; 
private static final String LOGIN_URL = getUrlData+"windex.php?itfpage=login"; 
//JSON element ids from repsonse of php script: 
private static final String TAG_SUCCESS = "success"; 
private static final String TAG_MESSAGE = "message"; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

     requestWindowFeature(Window.FEATURE_NO_TITLE); 
     getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, 
           WindowManager.LayoutParams.FLAG_FULLSCREEN); 
     SharedPreferences SP2 = getSharedPreferences("key",MODE_PRIVATE); 
     key=SP2.getString("key on click",""); 
     Log.v("key on create",key); 
     setContentView(R.layout.activity_main); 
     login_b1=(Button)findViewById(R.id.btnLogin); 
     user = (EditText)findViewById(R.id.mailid); 
     pass= (EditText)findViewById(R.id.pass); 

     login_b1.setOnClickListener(new OnClickListener() { 
      @Override 
      public void onClick(View v) { 

        mProgressDialog = new ProgressDialog(MainActivity.this); 
        mProgressDialog.setMessage("Signing In..."); 
        mProgressDialog.show(); 
        uname = user.getText().toString(); 
        Log.v("uname", ""+uname); 
        passStr = pass.getText().toString(); 
       String finalUrl = LOGIN_URL + "&email="+uname+"&password="+passStr; 
       Log.v("uname", ""+finalUrl); 
      try{ 
       obj = new HandleJSON(finalUrl); 
       obj.fetchJSON(); 

       while(obj.parsingComplete); 

       status=obj.status(); 
       Log.v("dooStatus",status); 
       Log.v("doo",""+obj.getRegid()); 
       if(!obj.getRegid().equals(null) && status.equals("success")){ 
        Log.v("do in try block",""+obj.getRegid()); 
        SP = getSharedPreferences("key",MODE_PRIVATE); 
        SP.edit() 
        .putString("key on click", obj.getRegid()) 
        .commit(); 
        Log.v("after shared",""+obj.getRegid());     
        Intent i = new Intent(getApplicationContext(), UserPage.class); 
        startActivity(i); 
       } 
       }catch(Exception e){ 
        e.printStackTrace(); 
        if(status.equals("failed")){ 
        Toast.makeText(getBaseContext(), "Incorrect UserId or Password ", Toast.LENGTH_LONG).show(); 
        }else if(status.equals("inactive")){ 
         Toast.makeText(getBaseContext(), "Please activate your account", Toast.LENGTH_LONG).show(); 
        } 
       } 

       mProgressDialog.dismiss(); 
      } 
     }); 

     TextView registerScreen = (TextView) findViewById(R.id.link_to_register); 

     // Listening to register new account link 
     registerScreen.setOnClickListener(new View.OnClickListener() { 

      public void onClick(View v) { 
       // Switching to Register screen 
       Intent i = new Intent(getApplicationContext(), RegisterActivity.class); 
       startActivity(i); 
      } 
     }); 

     TextView forgot=(TextView) findViewById(R.id.link_to_forgot); 
     forgot.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       // TODO Auto-generated method stub 
       Intent j = new Intent(getApplicationContext(), ForgotActivity.class); 
       startActivity(j); 
      } 
     }); 

} 
} 

Answer 1

你在同一区块，这就是为什么它没有显示书面.show()和.dismiss()。使用AsyncTask来代替您的流程。这里的教程，http://programmerguru.com/android-tutorial/android-asynctask-example/

Answer 2

public class ClassName extends AsyncTask<String, String, String>{ 

     @Override 
     protected void onPreExecute() { 
      super.onPreExecute(); 

      progressBar.setVisibility(View.VISIBLE); 
     } 

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

      //write code what you want to do @background don't try to write ui code here 
      return null; 
     } 

     @Override 
     protected void onPostExecute(String file_url) { 
      // after completing ur background task this function will run and u can as well write ui code right here.. 
      progressBar.setVisibility(View.GONE); 
     } 
    }