title: package org.apache.http.client does not exist
body: <p>I am trying to check log in credentials , But I am getting these errors again and again , I have tried everything. I am new to android 
  Any kind of help will be appreciated. If there is other good way to implement same , want to know how to imply</p>
  
  <p>Error</p>
  
  <pre><code>Error:(19, 30) error: package org.apache.http.client does not exist
  Error:(15, 23) error: package org.apache.http does not exist
  Error:(16, 23) error: package org.apache.http does not exist
  Error:(17, 23) error: package org.apache.http does not exist
  Error:(18, 30) error: package org.apache.http.client does not exist
  Error:(20, 37) error: package org.apache.http.client.entity does not exist
  Error:(21, 38) error: package org.apache.http.client.methods does not exist
  Error:(22, 35) error: package org.apache.http.impl.client does not exist
  Error:(23, 31) error: package org.apache.http.message does not exist
  Error:(79, 22) error: cannot find symbol class NameValuePair
  Error:(85, 49) error: cannot find symbol class DefaultHttpClient
  Error:(86, 21) error: cannot find symbol class HttpPost
  Error:(86, 45) error: cannot find symbol class HttpPost
  Error:(88, 44) error: cannot find symbol class UrlEncodedFormEntity
  Error:(90, 21) error: cannot find symbol class HttpResponse
  Error:(92, 21) error: cannot find symbol class HttpEntity
  Error:(105, 26) error: cannot find symbol class ClientProtocolException
  Error:Execution failed for task ':app:compileDebugJavaWithJavac'.
  &gt; Compilation failed; see the compiler error output for details.
  Error:(85, 21) error: cannot find symbol class HttpClient
  Error:(81, 40) error: cannot find symbol class BasicNameValuePair
  Error:(80, 40) error: cannot find symbol class BasicNameValuePair
  Error:(79, 68) error: cannot find symbol class NameValuePair    
  </code></pre>
  
  <p>MainActivity.java</p>
  
  <pre><code>package com.tarun.proxy_maar;
  
  import android.app.Dialog;
  import android.app.ProgressDialog;
  import android.content.Intent;
  import android.os.AsyncTask;
  import android.os.Bundle;
  import android.support.v7.app.AppCompatActivity;
  import android.view.Menu;
  import android.view.MenuItem;
  import android.view.View;
  import android.widget.EditText;
  import android.widget.Toast;
  
  import org.apache.http.HttpEntity;
  import org.apache.http.HttpResponse;
  import org.apache.http.NameValuePair;
  import org.apache.http.client.ClientProtocolException;
  import org.apache.http.client.HttpClient;
  import org.apache.http.client.entity.UrlEncodedFormEntity;
  import org.apache.http.client.methods.HttpPost;
  import org.apache.http.impl.client.DefaultHttpClient;
  import org.apache.http.message.BasicNameValuePair;
  
  import java.io.BufferedReader;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.InputStreamReader;
  import java.io.UnsupportedEncodingException;
  import java.util.ArrayList;
  import java.util.List;
  
  
  public class MainActivity extends AppCompatActivity {
  
      private EditText editTextUserName;
      private EditText editTextPassword;
  
      public static final String USER_NAME = "USERNAME";
  
      String username;
      String password;
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
  
          editTextUserName = (EditText) findViewById(R.id.editTextUserName);
          editTextPassword = (EditText) findViewById(R.id.editTextPassword);
      }
  
      public void invokeLogin(View view){
          username = editTextUserName.getText().toString();
          password = editTextPassword.getText().toString();
  
          login(username,password);
  
      }
  
      private void login(final String username, String password) {
  
          class LoginAsync extends AsyncTask&lt;String, Void, String&gt;{
  
              private Dialog loadingDialog;
  
              @Override
              protected void onPreExecute() {
                  super.onPreExecute();
                  loadingDialog = ProgressDialog.show(MainActivity.this, "Please wait", "Loading...");
              }
  
              @Override
              protected String doInBackground(String... params) {
                  String uname = params[0];
                  String pass = params[1];
  
                  InputStream is = null;
                  List&lt;NameValuePair&gt; nameValuePairs = new ArrayList&lt;NameValuePair&gt;();
                  nameValuePairs.add(new BasicNameValuePair("username", uname));
                  nameValuePairs.add(new BasicNameValuePair("password", pass));
                  String result = null;
  
                  try{
                      HttpClient httpClient = new DefaultHttpClient();
                      HttpPost httpPost = new HttpPost(
                              "http://shaadi.web44.net/hello.php");
                      httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
  
                      HttpResponse response = httpClient.execute(httpPost);
  
                      HttpEntity entity = response.getEntity();
  
                      is = entity.getContent();
  
                      BufferedReader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"), 8);
                      StringBuilder sb = new StringBuilder();
  
                      String line = null;
                      while ((line = reader.readLine()) != null)
                      {
                          sb.append(line + "\n");
                      }
                      result = sb.toString();
                  } catch (ClientProtocolException e) {
                      e.printStackTrace();
                  } catch (UnsupportedEncodingException e) {
                      e.printStackTrace();
                  } catch (IOException e) {
                      e.printStackTrace();
                  }
                  return result;
              }
  
              @Override
              protected void onPostExecute(String result){
                  String s = result.trim();
                  loadingDialog.dismiss();
                  if(s.equalsIgnoreCase("success")){
                      Intent intent = new Intent(MainActivity.this, UserProfile.class);
                      intent.putExtra(USER_NAME, username);
                      finish();
                      startActivity(intent);
                  }else {
                      Toast.makeText(getApplicationContext(), "Invalid User Name or Password", Toast.LENGTH_LONG).show();
                  }
              }
          }
  
          LoginAsync la = new LoginAsync();
          la.execute(username, password);
  
      }
  
  
      @Override
      public boolean onCreateOptionsMenu(Menu menu) {
          // Inflate the menu; this adds items to the action bar if it is present.
          getMenuInflater().inflate(R.menu.menu_main, menu);
          return true;
      }
  
      @Override
      public boolean onOptionsItemSelected(MenuItem item) {
          // Handle action bar item clicks here. The action bar will
          // automatically handle clicks on the Home/Up button, so long
          // as you specify a parent activity in AndroidManifest.xml.
          int id = item.getItemId();
  
          //noinspection SimplifiableIfStatement
          if (id == R.id.action_settings) {
              return true;
          }
  
          return super.onOptionsItemSelected(item);
      }
  }
  </code></pre>