用androidstudio写一个可以和springboot连接的登录注册系统

好的，下面是一个简单的Android Studio登录注册系统的实现步骤：

1. 创建一个新的Android Studio项目，选择Empty Activity。

2. 在app/build.gradle文件中添加以下依赖项：

implementation 'com.android.volley:volley:1.1.1'
implementation 'com.android.support:design:28.0.0'

3. 在AndroidManifest.xml文件中添加以下权限：

<uses-permission android:name="android.permission.INTERNET" />

4. 在res/layout文件夹中创建activity_login.xml和activity_register.xml布局文件，分别用于登录和注册界面。

5. 在MainActivity.java中，实现登录和注册方法，代码如下：

public class MainActivity extends AppCompatActivity {

    private EditText etUsername, etPassword;
    private Button btnLogin, btnRegister;

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

        etUsername = findViewById(R.id.et_username);
        etPassword = findViewById(R.id.et_password);
        btnLogin = findViewById(R.id.btn_login);
        btnRegister = findViewById(R.id.btn_register);

        btnLogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String username = etUsername.getText().toString();
                String password = etPassword.getText().toString();
                login(username, password);
            }
        });

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

    private void login(final String username, final String password) {
        String url = "http://your_server_url/login.php";

        StringRequest stringRequest = new StringRequest(Request.Method.POST, url,
                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                        if (response.trim().equals("success")) {
                            Toast.makeText(MainActivity.this, "Login Success!", Toast.LENGTH_SHORT).show();
                        } else {
                            Toast.makeText(MainActivity.this, "Login Failed!", Toast.LENGTH_SHORT).show();
                        }
                    }
                }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                Toast.makeText(MainActivity.this, "Error: " + error.getMessage(), Toast.LENGTH_SHORT).show();
            }
        }) {
            @Override
            protected Map<String, String> getParams() {
                Map<String, String> params = new HashMap<>();
                params.put("username", username);
                params.put("password", password);
                return params;
            }
        };

        Volley.newRequestQueue(this).add(stringRequest);
    }
}

6. 在res/layout文件夹中创建activity_register.xml布局文件，用于注册界面。

7. 在RegisterActivity.java中，实现注册方法，代码如下：

public class RegisterActivity extends AppCompatActivity {

    private EditText etUsername, etPassword, etConfirmPassword;
    private Button btnRegister;

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

        etUsername = findViewById(R.id.et_username);
        etPassword = findViewById(R.id.et_password);
        etConfirmPassword = findViewById(R.id.et_confirm_password);
        btnRegister = findViewById(R.id.btn_register);

        btnRegister.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String username = etUsername.getText().toString();
                String password = etPassword.getText().toString();
                String confirmPassword = etConfirmPassword.getText().toString();
                if (password.equals(confirmPassword)) {
                    register(username, password);
                } else {
                    Toast.makeText(RegisterActivity.this, "Passwords do not match!", Toast.LENGTH_SHORT).show();
                }
            }
        });
    }

    private void register(final String username, final String password) {
        String url = "http://your_server_url/register.php";

        StringRequest stringRequest = new StringRequest(Request.Method.POST, url,
                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                        if (response.trim().equals("success")) {
                            Toast.makeText(RegisterActivity.this, "Registration Success!", Toast.LENGTH_SHORT).show();
                            finish();
                        } else {
                            Toast.makeText(RegisterActivity.this, "Registration Failed!", Toast.LENGTH_SHORT).show();
                        }
                    }
                }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                Toast.makeText(RegisterActivity.this, "Error: " + error.getMessage(), Toast.LENGTH_SHORT).show();
            }
        }) {
            @Override
            protected Map<String, String> getParams() {
                Map<String, String> params = new HashMap<>();
                params.put("username", username);
                params.put("password", password);
                return params;
            }
        };

        Volley.newRequestQueue(this).add(stringRequest);
    }
}

8. 在服务器端实现登录和注册接口，示例代码如下：

<?php

$conn = mysqli_connect("localhost", "username", "password", "database");

if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    $username = $_POST['username'];
    $password = $_POST['password'];
    $password = hash('sha256', $password);

    $sql = "SELECT * FROM users WHERE username = '$username' AND password = '$password'";
    $result = mysqli_query($conn, $sql);
    if (mysqli_num_rows($result) > 0) {
        echo "success";
    } else {
        echo "failure";
    }
}

mysqli_close($conn);

?>

<?php

$conn = mysqli_connect("localhost", "username", "password", "database");

if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    $username = $_POST['username'];
    $password = $_POST['password'];
    $password = hash('sha256', $password);

    $sql = "INSERT INTO users (username, password) VALUES ('$username', '$password')";
    if (mysqli_query($conn, $sql)) {
        echo "success";
    } else {
        echo "failure";
    }
}

mysqli_close($conn);

?>

注意：这只是一个简单的示例，实际应用中需要进行更多的安全性检查和验证。