android studio登陆注册代码

以下是一个简单的 Android Studio 登录注册界面的代码示例：

1. activity_login.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="60dp"
        android:text="Login"
        android:textSize="30sp"
        android:textStyle="bold"
        android:layout_centerHorizontal="true"/>

    <EditText
        android:id="@+id/editTextEmail"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/textView"
        android:layout_marginTop="40dp"
        android:hint="Email"
        android:inputType="textEmailAddress"
        android:padding="10dp"
        android:textColor="#000000"
        android:textSize="20sp" />

    <EditText
        android:id="@+id/editTextPassword"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/editTextEmail"
        android:layout_marginTop="20dp"
        android:hint="Password"
        android:inputType="textPassword"
        android:padding="10dp"
        android:textColor="#000000"
        android:textSize="20sp" />

    <Button
        android:id="@+id/buttonLogin"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/editTextPassword"
        android:layout_marginTop="20dp"
        android:background="#009688"
        android:padding="10dp"
        android:text="LOGIN"
        android:textAllCaps="false"
        android:textColor="#ffffff"
        android:textSize="20sp" />

    <TextView
        android:id="@+id/textViewRegister"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/buttonLogin"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="20dp"
        android:text="Don't have an account? Register now!"
        android:textColor="#000000"
        android:textSize="16sp" />

</RelativeLayout>

2. activity_register.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="60dp"
        android:text="Register"
        android:textSize="30sp"
        android:textStyle="bold"
        android:layout_centerHorizontal="true"/>

    <EditText
        android:id="@+id/editTextName"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/textView"
        android:layout_marginTop="40dp"
        android:hint="Name"
        android:inputType="text"
        android:padding="10dp"
        android:textColor="#000000"
        android:textSize="20sp" />

    <EditText
        android:id="@+id/editTextEmail"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/editTextName"
        android:layout_marginTop="20dp"
        android:hint="Email"
        android:inputType="textEmailAddress"
        android:padding="10dp"
        android:textColor="#000000"
        android:textSize="20sp" />

    <EditText
        android:id="@+id/editTextPassword"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/editTextEmail"
        android:layout_marginTop="20dp"
        android:hint="Password"
        android:inputType="textPassword"
        android:padding="10dp"
        android:textColor="#000000"
        android:textSize="20sp" />

    <Button
        android:id="@+id/buttonRegister"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/editTextPassword"
        android:layout_marginTop="20dp"
        android:background="#009688"
        android:padding="10dp"
        android:text="REGISTER"
        android:textAllCaps="false"
        android:textColor="#ffffff"
        android:textSize="20sp" />

    <TextView
        android:id="@+id/textViewLogin"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/buttonRegister"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="20dp"
        android:text="Already have an account? Login now!"
        android:textColor="#000000"
        android:textSize="16sp" />

</RelativeLayout>

3. LoginActivity.java

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class LoginActivity extends AppCompatActivity {

    private EditText editTextEmail, editTextPassword;
    private Button buttonLogin;
    private TextView textViewRegister;

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

        editTextEmail = findViewById(R.id.editTextEmail);
        editTextPassword = findViewById(R.id.editTextPassword);
        buttonLogin = findViewById(R.id.buttonLogin);
        textViewRegister = findViewById(R.id.textViewRegister);

        buttonLogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String email = editTextEmail.getText().toString().trim();
                String password = editTextPassword.getText().toString().trim();

                if (email.isEmpty()) {
                    editTextEmail.setError("Email is required");
                    editTextEmail.requestFocus();
                    return;
                }

                if (password.isEmpty()) {
                    editTextPassword.setError("Password is required");
                    editTextPassword.requestFocus();
                    return;
                }

                if (email.equals("example@gmail.com") && password.equals("12345")) {
                    startActivity(new Intent(LoginActivity.this, MainActivity.class));
                } else {
                    Toast.makeText(LoginActivity.this, "Invalid email or password", Toast.LENGTH_SHORT).show();
                }
            }
        });

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

4. RegisterActivity.java

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class RegisterActivity extends AppCompatActivity {

    private EditText editTextName, editTextEmail, editTextPassword;
    private Button buttonRegister;
    private TextView textViewLogin;

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

        editTextName = findViewById(R.id.editTextName);
        editTextEmail = findViewById(R.id.editTextEmail);
        editTextPassword = findViewById(R.id.editTextPassword);
        buttonRegister = findViewById(R.id.buttonRegister);
        textViewLogin = findViewById(R.id.textViewLogin);

        buttonRegister.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String name = editTextName.getText().toString().trim();
                String email = editTextEmail.getText().toString().trim();
                String password = editTextPassword.getText().toString().trim();

                if (name.isEmpty()) {
                    editTextName.setError("Name is required");
                    editTextName.requestFocus();
                    return;
                }

                if (email.isEmpty()) {
                    editTextEmail.setError("Email is required");
                    editTextEmail.requestFocus();
                    return;
                }

                if (password.isEmpty()) {
                    editTextPassword.setError("Password is required");
                    editTextPassword.requestFocus();
                    return;
                }

                Toast.makeText(RegisterActivity.this, "Registration successful", Toast.LENGTH_SHORT).show();
            }
        });

        textViewLogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                finish();
            }
        });
    }
}

这是一个很简单的示例，你需要根据自己的需求来进行修改和完善。