Regiister2.java

package com.example.tugasbesar;

import androidx.appcompat.app.AppCompatActivity;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;

import com.google.android.material.snackbar.Snackbar;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;

import static android.text.TextUtils.isEmpty;


public class Register2 extends AppCompatActivity {
    private DatabaseReference database;
    private Button btDaftar;
    EditText etBeratBadan;
    EditText etTinggiBadan;
    Spinner spAktivitas;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_register2);

        etBeratBadan = findViewById(R.id.BeratBadan);
        etTinggiBadan = findViewById(R.id.TinggiBadan);
        spAktivitas = findViewById(R.id.spinner1);
        btDaftar = findViewById(R.id.bt_daftar);

        database = FirebaseDatabase.getInstance().getReference();

        btDaftar.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (!isEmpty(etBeratBadan.getText().toString()) &&
                    !isEmpty(etTinggiBadan.getText().toString()))
                    submitDataPenderita(new dataPenderita(etBeratBadan.getText().toString(),
                                        etTinggiBadan.getText().toString(),spAktivitas.getSelectedItem().toString()));
                else
                    Snackbar.make(findViewById(R.id.bt_daftar), "Tidak Boleh Kosong",
                        Snackbar.LENGTH_LONG).show();

                InputMethodManager imm = (InputMethodManager)
                    getSystemService(Context.INPUT_METHOD_SERVICE);
                imm.hideSoftInputFromWindow(
                    etBeratBadan.getWindowToken(),0
                );
            }
        });
    }

    private void submitDataPenderita(dataPenderita dataPenderita) {
    }


    public static Intent getRegister2Intent(Activity activity){
        return new Intent(activity, Register2.class);

    }
}