android 登录注册功能代码

以下是一个简单的Android登录注册功能的代码示例：

**activity_login.xml:**

<LinearLayout
    android:id="@+id/login_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_margin="16dp"
    android:gravity="center"
    android:orientation="vertical">

    <EditText
        android:id="@+id/email_edittext"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Email" />

    <EditText
        android:id="@+id/password_edittext"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Password"
        android:inputType="textPassword" />

    <Button
        android:id="@+id/login_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Login" />

    <TextView
        android:id="@+id/register_textview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:text="Don't have an account? Register here." />

</LinearLayout>

**activity_register.xml:**

<LinearLayout
    android:id="@+id/register_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_margin="16dp"
    android:gravity="center"
    android:orientation="vertical">

    <EditText
        android:id="@+id/name_edittext"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Name" />

    <EditText
        android:id="@+id/email_edittext"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Email" />

    <EditText
        android:id="@+id/password_edittext"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Password"
        android:inputType="textPassword" />

    <Button
        android:id="@+id/register_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Register" />

</LinearLayout>

**LoginActivity.java:**

public class LoginActivity extends AppCompatActivity {

    private EditText mEmailEditText;
    private EditText mPasswordEditText;
    private Button mLoginButton;
    private TextView mRegisterTextView;

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

        mEmailEditText = findViewById(R.id.email_edittext);
        mPasswordEditText = findViewById(R.id.password_edittext);
        mLoginButton = findViewById(R.id.login_button);
        mRegisterTextView = findViewById(R.id.register_textview);

        mLoginButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String email = mEmailEditText.getText().toString();
                String password = mPasswordEditText.getText().toString();

                // TODO: 在这里处理登录逻辑
            }
        });

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

**RegisterActivity.java:**

public class RegisterActivity extends AppCompatActivity {

    private EditText mNameEditText;
    private EditText mEmailEditText;
    private EditText mPasswordEditText;
    private Button mRegisterButton;

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

        mNameEditText = findViewById(R.id.name_edittext);
        mEmailEditText = findViewById(R.id.email_edittext);
        mPasswordEditText = findViewById(R.id.password_edittext);
        mRegisterButton = findViewById(R.id.register_button);

        mRegisterButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String name = mNameEditText.getText().toString();
                String email = mEmailEditText.getText().toString();
                String password = mPasswordEditText.getText().toString();

                // TODO: 在这里处理注册逻辑
            }
        });
    }
}

请注意，这只是一个示例代码，实际应用中您需要添加更多的验证和错误处理逻辑。另外，建议使用加密技术来保护用户密码。