How do I using getText() in AlertDialog?

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Mobile

Android

Android4x

I create an AlertDialog inside a fragment which contains 3 EditText (using LinearLayout as the layout inside AlertDialog). But I got an error when trying to getTextt from the three of the EditText. Here's the code:

AlertDialog.Builder alert = new AlertDialog.Builder(this.getActivity());
	        	  alert.setTitle("Add New Supplier");
	        	  //Set an EditText view to get user input
	        	  inputname = new EditText(Supplier.this.getActivity());
	        	  inputadd = new EditText(Supplier.this.getActivity());
	        	  inputtelp = new EditText(Supplier.this.getActivity());
	        	  	        	  
	        	  inputname.setHint("Supplier's Name");
	        	  inputadd.setHint("Supplier's Address");
	        	  inputtelp.setHint("Supplier's Telp");
	        	  
	        	  inputtelp.setInputType(InputType.TYPE_CLASS_NUMBER);
	        	 
	        	  LinearLayout lay = new LinearLayout(Supplier.this.getActivity());
	        	  lay.setOrientation(LinearLayout.VERTICAL);
	        	  lay.addView(inputname);
	        	  lay.addView(inputadd);
	        	  lay.addView(inputtelp);
	        	  alert.setView(lay);

alert.setPositiveButton("OK", new DialogInterface.OnClickListener() {
					
					@Override
					public void onClick(DialogInterface dialog, int which) {						
						new AddNewSupplier().execute();
}
	        	  });

Then inside the AddNewSupplier class

protected String doInBackground(String... arg0) {
            String namesupplier = inputname.getText().toString();
            String addsupplier = inputadd.getText().toString();
            String telpsupplier = inputtelp.getText().toString();


            Toast.makeText(Supplier.this.getActivity(), namesupplier + "\n" + addsupplier + "\n" + telpsupplier, Toast.LENGTH_LONG).show();

What's wrong?
Any help, Thanks

-Rudy