Android studio登录注册页面代码

好的，以下是一个简单的Android Studio登录注册页面代码，包括登录、注册和跳转到主页面的功能。这里使用了Firebase Authentication来进行用户认证和管理。请注意，为了让代码简单易懂，这里省略了一些代码注释和布局文件的定义。

public class LoginActivity extends AppCompatActivity {
    private EditText etEmail, etPassword;
    private Button btnLogin;
    private TextView tvRegister;

    private FirebaseAuth mAuth;

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

        mAuth = FirebaseAuth.getInstance();

        etEmail = findViewById(R.id.et_email);
        etPassword = findViewById(R.id.et_password);
        btnLogin = findViewById(R.id.btn_login);
        tvRegister = findViewById(R.id.tv_register);

        btnLogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String email = etEmail.getText().toString().trim();
                String password = etPassword.getText().toString().trim();

                if (TextUtils.isEmpty(email)) {
                    etEmail.setError("Email is required!");
                    return;
                }

                if (TextUtils.isEmpty(password)) {
                    etPassword.setError("Password is required!");
                    return;
                }

                mAuth.signInWithEmailAndPassword(email, password)
                        .addOnCompleteListener(new OnCompleteListener<AuthResult>() {
                            @Override
                            public void onComplete(@NonNull Task<AuthResult> task) {
                                if (task.isSuccessful()) {
                                    Toast.makeText(LoginActivity.this, "Login success!", Toast.LENGTH_SHORT).show();
                                    startActivity(new Intent(LoginActivity.this, MainActivity.class));
                                    finish();
                                } else {
                                    Toast.makeText(LoginActivity.this, "Error: " + task.getException().getMessage(), Toast.LENGTH_SHORT).show();
                                }
                            }
                        });
            }
        });

        tvRegister.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(LoginActivity.this, RegisterActivity.class));
            }
        });
    }
}

public class RegisterActivity extends AppCompatActivity {
    private EditText etEmail, etPassword;
    private Button btnRegister;

    private FirebaseAuth mAuth;

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

        mAuth = FirebaseAuth.getInstance();

        etEmail = findViewById(R.id.et_email);
        etPassword = findViewById(R.id.et_password);
        btnRegister = findViewById(R.id.btn_register);

        btnRegister.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String email = etEmail.getText().toString().trim();
                String password = etPassword.getText().toString().trim();

                if (TextUtils.isEmpty(email)) {
                    etEmail.setError("Email is required!");
                    return;
                }

                if (TextUtils.isEmpty(password)) {
                    etPassword.setError("Password is required!");
                    return;
                }

                mAuth.createUserWithEmailAndPassword(email, password)
                        .addOnCompleteListener(new OnCompleteListener<AuthResult>() {
                            @Override
                            public void onComplete(@NonNull Task<AuthResult> task) {
                                if (task.isSuccessful()) {
                                    Toast.makeText(RegisterActivity.this, "Register success!", Toast.LENGTH_SHORT).show();
                                    startActivity(new Intent(RegisterActivity.this, MainActivity.class));
                                    finish();
                                } else {
                                    Toast.makeText(RegisterActivity.this, "Error: " + task.getException().getMessage(), Toast.LENGTH_SHORT).show();
                                }
                            }
                        });
            }
        });
    }
}

以上是登录和注册页面的代码示例，使用Firebase Authentication可以快速实现用户认证和管理。但在实际开发中，需要根据具体需求进行修改和完善。同时，也需要注意用户信息的安全性，例如加密存储用户密码等。