final EditText inputOne = new EditText(MainActivity.this);
final EditText inputTwo = new EditText(MainActivity.this);

LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
                        LinearLayout.LayoutParams.WRAP_CONTENT,
                        LinearLayout.LayoutParams.WRAP_CONTENT
                );

AlertDialog.Builder alertDialog = new AlertDialog.Builder(this);
inputOne.setLayoutParams(lp);
inputOne.setLayoutParams(lp);

alertDialog.setView(inputOne);
alertDialog.setView(inputTwo);