How to add TextView and EditText using default AlertDialog programmatically

I've been trying to add two elements in a default AlertDialog but I can't seem to make it work. Here's my code:

// START Dialog
    AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);

    TextView tv = new TextView(this);
    tv.setText(title);
    tv.setPadding(40, 40, 40, 40);
    tv.setGravity(Gravity.CENTER);
    tv.setTextSize(20);

    EditText et = new EditText(this);
    etStr = et.getText().toString();

    alertDialogBuilder.setView(et);
    alertDialogBuilder.setTitle(title);
    alertDialogBuilder.setMessage("Input Student ID");
    alertDialogBuilder.setCustomTitle(tv);

    if (isError)
        alertDialogBuilder.setIcon(R.drawable.icon_warning);
    // alertDialogBuilder.setMessage(message);
    alertDialogBuilder.setCancelable(false);

    // Setting Negative "Cancel" Button
    alertDialogBuilder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int whichButton) {
            dialog.cancel();
        }
    });

    // Setting Positive "Yes" Button
    alertDialogBuilder.setPositiveButton("OK",
            new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int which) {
                    if (isError)
                        finish();
                    else {
                        Intent intent = new Intent(
                                ChangeDeviceActivity.this,
                                MyPageActivity.class);
                        startActivity(intent);
                    }
                }
            });

    AlertDialog alertDialog = alertDialogBuilder.create();

    try {
        alertDialog.show();
    } catch (Exception e) {
        // WindowManager$BadTokenException will be caught and the app would
        // not display the 'Force Close' message
        e.printStackTrace();
    }

For now, this is only an EditText with a message set by alertDialogBuilder.setMessage("Input Student ID"); but I want to make this a TextView so I can center-justify it. How do I do this?

        AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);

        LinearLayout layout = new LinearLayout(this);
        LinearLayout.LayoutParams parms = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
        layout.setOrientation(LinearLayout.VERTICAL);
        layout.setLayoutParams(parms);

        layout.setGravity(Gravity.CLIP_VERTICAL);
        layout.setPadding(2, 2, 2, 2);

        TextView tv = new TextView(this);
        tv.setText("Text View title");
        tv.setPadding(40, 40, 40, 40);
        tv.setGravity(Gravity.CENTER);
        tv.setTextSize(20);

        EditText et = new EditText(this);
        etStr = et.getText().toString();
        TextView tv1 = new TextView(this);
        tv1.setText("Input Student ID");

        LinearLayout.LayoutParams tv1Params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
        tv1Params.bottomMargin = 5;
        layout.addView(tv1,tv1Params);
        layout.addView(et, new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT));

        alertDialogBuilder.setView(layout);
        alertDialogBuilder.setTitle(title);
        // alertDialogBuilder.setMessage("Input Student ID");
        alertDialogBuilder.setCustomTitle(tv);

        if (isError)
            alertDialogBuilder.setIcon(R.drawable.icon_warning);
        // alertDialogBuilder.setMessage(message);
        alertDialogBuilder.setCancelable(false);

        // Setting Negative "Cancel" Button
        alertDialogBuilder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int whichButton) {
                dialog.cancel();
            }
        });

        // Setting Positive "OK" Button
        alertDialogBuilder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                if (isError)
                    finish();
                else {
                      Intent intent = new Intent(ChangeDeviceActivity.this,
                      MyPageActivity.class); startActivity(intent);
                }
            }
        });

        AlertDialog alertDialog = alertDialogBuilder.create();

        try {
            alertDialog.show();
        } catch (Exception e) {
            // WindowManager$BadTokenException will be caught and the app would
            // not display the 'Force Close' message
            e.printStackTrace();
        }