JSFiddle - React, Tailwind, and code Playground

JavaScript

package com.example.user.imported;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import java.util.ArrayList;

public class AddActivity extends AppCompatActivity {
    EditText name, phone;
    Button add;
    int FphoneNumber;
    String Fname;
    ArrayList<Student> students;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Intent intent = getIntent();
        students = (ArrayList<Student>) getIntent().getSerializableExtra("AddNewStudent");
        setContentView(R.layout.activity_add);
        edit();
        addStudent();



    }



    public void edit() {
        name = (EditText) findViewById(R.id.StudentName);
        phone = (EditText) findViewById(R.id.phone);
        final Button addStudent = (Button) findViewById(R.id.AddStudent);

        name.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {

            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                addStudent.setEnabled(!name.getText().toString().trim().isEmpty());
                Fname = name.getText().toString();

                String phoneNumber = phone.getText().toString();
                FphoneNumber = Integer.parseInt(phoneNumber);
            }

            @Override
            public void afterTextChanged(Editable s) {

            }


        });
    }





    public void addStudent() {

        add = (Button) findViewById(R.id.AddStudent);

        add.setOnClickListener(new View.OnClickListener() {
            @Override

            public void onClick(View v) {
/*
               ...