How to have two navigation form one login page according to role of user

Hello guys

my case in quick
i am developing an android app
i created a database in mysql
and im using php to fetch data to android app

what i want to have navigation to two different pages according to role
if username and password available and role is student navigate me to page1

if username and password available and role is lecturer navigate me to page2

in my database i created the following fields
id
username
password
role

in main.xml i decided to add radio button which allows user to select whether student or lecturer

and here is my code in MainActivity.java

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    
    b = (Button)findViewById(R.id.Button01);  
    et = (EditText)findViewById(R.id.username);
    pass= (EditText)findViewById(R.id.password);
    rl= (RadioButton)findViewById(R.id.radio1);
    rl2= (RadioButton)findViewById(R.id.radio2);
    tv = (TextView)findViewById(R.id.tv);
    
    
    b.setOnClickListener(new OnClickListener() {
		@Override
		public void onClick(View v) {
			

			dialog = ProgressDialog.show(AndroidPHPConnectionDemo.this, "", 
                    "Validating user...", true);
			 new Thread(new Runnable() {
				    public void run() {
				    	login(null, null);					      
				    }
				  }).start();				
		}
	});
}
    	


void login(String lecturer, String student){
	try{			
		 
		httpclient=new DefaultHttpClient();
		httppost= new HttpPost("http://10.0.2.2/my_folder_inside_htdocs/check6.php"); // make sure the url is correct.
		//add your data
		nameValuePairs = new ArrayList<NameValuePair>(2);
		// Always use the same variable name for posting i.e the android side variable name and php side variable name should be similar, 
		nameValuePairs.add(new BasicNameValuePair("username",et.getText().toString().trim()));  // $Edittext_value = $_POST['Edittext_value'];
		nameValuePairs.add(new BasicNameValuePair("password",pass.getText().toString().trim())); 
		nameValuePairs.add(new BasicNameValuePair("role",rl.getText().toString().trim()));
		nameValuePairs.add(new BasicNameValuePair("role",rl2.getText().toString().trim()));
		
		httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
		//Execute HTTP Post Request
		response=httpclient.execute(httppost);
		// edited by James from coderzheaven.. from here....
		ResponseHandler<String> responseHandler = new BasicResponseHandler();
		final String response = httpclient.execute(httppost, responseHandler);
		System.out.println("Response : " + response); 
		runOnUiThread(new Runnable() {
		    public void run() {
		    	tv.setText("Response from PHP : " + response);
				dialog.dismiss();
		    }
		});
		
		
		if(response==student){
			runOnUiThread(new Runnable() {
			    public void run() {
			    	Toast.makeText(AndroidPHPConnectionDemo.this,"Login Success", Toast.LENGTH_SHORT).show();
			    }
			});
			
			startActivity(new Intent(AndroidPHPConnectionDemo.this, UserPage.class));
		}else if(response==lecturer){
			runOnUiThread(new Runnable() {
			    public void run() {
			    	Toast.makeText(AndroidPHPConnectionDemo.this,"Login Success", Toast.LENGTH_SHORT).show();
			    }
			});
			
			startActivity(new Intent(AndroidPHPConnectionDemo.this, UserPage.class)); 
		} else
			showAlert();				
		
			
	}catch(Exception e){
		dialog.dismiss();
		System.out.println("Exception : " + e.getMessage());
	}
}
public void showAlert(){
	AndroidPHPConnectionDemo.this.runOnUiThread(new Runnable() {
	    public void run() {
	    	AlertDialog.Builder builder = new AlertDialog.Builder(AndroidPHPConnectionDemo.this);
	    	builder.setTitle("Login Error.");
	    	builder.setMessage("User not Found.")  
	    	       .setCancelable(false)
	    	       .setPositiveButton("OK", new DialogInterface.OnClickListener() {
	    	           public void onClick(DialogInterface dialog, int id) {
	    	           }
	    	       });		    	       
	    	AlertDialog alert = builder.create();
	    	alert.show();		    	
	    }
	});
}

}

i guess my problem comes in java code maybe in if statement
because when i run it i got the response from php that the user is found but that did not help enough to navigate me to anywhere
can anyone check my code please

looking forward to hear from you

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