使用firebase Toast message检查电子邮件的EditTexts和密码是否为空

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import com.google.firebase.FirebaseApp;

public class MainActivity extends AppCompatActivity {

    private EditText emailEditText, passwordEditText;
    private Button loginButton;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // 初始化Firebase
        FirebaseApp.initializeApp(this);

        // 获取EditText和Button对象
        emailEditText = findViewById(R.id.emailEditText);
        passwordEditText = findViewById(R.id.passwordEditText);
        loginButton = findViewById(R.id.loginButton);

        loginButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // 获取输入内容
                String email = emailEditText.getText().toString();
                String password = passwordEditText.getText().toString();

                // 检查输入内容是否为空
                if (TextUtils.isEmpty(email) || TextUtils.isEmpty(password)) {
                    // 显示Toast message
                    Toast.makeText(MainActivity.this, "电子邮件和密码不能为空", Toast.LENGTH_SHORT).show();
                } else {
                    // 验证电子邮件和密码
                    // TODO: 在此处添加验证逻辑
                }
            }
        });
    }
}