基于安卓图书馆管理系统用户注册页面的代码

以下是基于安卓图书馆管理系统用户注册页面的代码示例，供您参考：

1. 注册页面的布局代码（register.xml）：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/register_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="用户注册"
        android:textSize="24sp"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="20dp"/>

    <EditText
        android:id="@+id/register_username"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/register_title"
        android:hint="用户名"
        android:layout_marginTop="20dp"/>

    <EditText
        android:id="@+id/register_password"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/register_username"
        android:hint="密码"
        android:inputType="textPassword"
        android:layout_marginTop="20dp"/>

    <EditText
        android:id="@+id/register_confirm_password"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/register_password"
        android:hint="确认密码"
        android:inputType="textPassword"
        android:layout_marginTop="20dp"/>

    <Button
        android:id="@+id/register_btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="注册"
        android:layout_below="@id/register_confirm_password"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="20dp"/>

</RelativeLayout>

2. 注册页面的Java代码（RegisterActivity.java）：

public class RegisterActivity extends AppCompatActivity {

    private EditText mUsername;
    private EditText mPassword;
    private EditText mConfirmPassword;
    private Button mRegisterBtn;

    private DBHelper mDBHelper;

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

        mUsername = findViewById(R.id.register_username);
        mPassword = findViewById(R.id.register_password);
        mConfirmPassword = findViewById(R.id.register_confirm_password);
        mRegisterBtn = findViewById(R.id.register_btn);

        mDBHelper = new DBHelper(this);

        mRegisterBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String username = mUsername.getText().toString().trim();
                String password = mPassword.getText().toString().trim();
                String confirmPassword = mConfirmPassword.getText().toString().trim();

                if (TextUtils.isEmpty(username)) {
                    Toast.makeText(RegisterActivity.this, "请输入用户名", Toast.LENGTH_SHORT).show();
                    return;
                }

                if (TextUtils.isEmpty(password)) {
                    Toast.makeText(RegisterActivity.this, "请输入密码", Toast.LENGTH_SHORT).show();
                    return;
                }

                if (!password.equals(confirmPassword)) {
                    Toast.makeText(RegisterActivity.this, "两次输入的密码不一致", Toast.LENGTH_SHORT).show();
                    return;
                }

                boolean result = mDBHelper.insertUser(username, password);

                if (result) {
                    Toast.makeText(RegisterActivity.this, "注册成功", Toast.LENGTH_SHORT).show();
                    finish();
                } else {
                    Toast.makeText(RegisterActivity.this, "注册失败", Toast.LENGTH_SHORT).show();
                }
            }
        });
    }
}

3. 数据库操作工具类代码（DBHelper.java）：

public class DBHelper extends SQLiteOpenHelper {

    private static final String DB_NAME = "library.db";
    private static final int DB_VERSION = 1;

    private static final String CREATE_USER_TABLE = "CREATE TABLE user (id INTEGER PRIMARY KEY AUTOINCREMENT, username TEXT, password TEXT)";
    private static final String QUERY_USER_BY_USERNAME = "SELECT * FROM user WHERE username=?";
    private static final String INSERT_USER = "INSERT INTO user (username,password) VALUES (?,?)";

    public DBHelper(Context context) {
        super(context, DB_NAME, null, DB_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(CREATE_USER_TABLE);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

    }

    public boolean insertUser(String username, String password) {
        SQLiteDatabase db = getWritableDatabase();
        ContentValues values = new ContentValues();
        values.put("username", username);
        values.put("password", password);
        long result = db.insert("user", null, values);
        db.close();
        return result != -1;
    }

    public User queryUserByUsername(String username) {
        SQLiteDatabase db = getReadableDatabase();
        Cursor cursor = db.rawQuery(QUERY_USER_BY_USERNAME, new String[]{username});

        if (cursor.moveToFirst()) {
            User user = new User();
            user.setId(cursor.getInt(cursor.getColumnIndex("id")));
            user.setUsername(cursor.getString(cursor.getColumnIndex("username")));
            user.setPassword(cursor.getString(cursor.getColumnIndex("password")));
            cursor.close();
            db.close();
            return user;
        }

        cursor.close();
        db.close();
        return null;
    }
}

以上代码仅供参考，具体实现还需要根据您自己的需求进行调整和修改。