那你给我技术实现部分的代码吧

好的，我可以给您提供一些技术实现的代码，帮助您更好地理解和实现您的项目。由于篇幅较长，我将分为不同的模块进行代码示例。

1. SQLite3数据库操作

创建SQLiteOpenHelper类：

public class DBHelper extends SQLiteOpenHelper {

    private static final String DATABASE_NAME = "book.db"; // 数据库名称
    private static final int DATABASE_VERSION = 1; // 数据库版本号
    private static final String TABLE_NAME = "book"; // 表名
    private static final String COLUMN_ID = "id"; // 列名：ID
    private static final String COLUMN_NAME = "name"; // 列名：书名
    private static final String COLUMN_AUTHOR = "author"; // 列名：作者
    private static final String COLUMN_ISBN = "isbn"; // 列名：ISBN
    private static final String COLUMN_STATUS = "status"; // 列名：借还状态

    public DBHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        // 创建表
        String sql = "CREATE TABLE " + TABLE_NAME + "("
                + COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT,"
                + COLUMN_NAME + " TEXT,"
                + COLUMN_AUTHOR + " TEXT,"
                + COLUMN_ISBN + " TEXT,"
                + COLUMN_STATUS + " INTEGER)";
        db.execSQL(sql);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // 更新表
        String sql = "DROP TABLE IF EXISTS " + TABLE_NAME;
        db.execSQL(sql);
        onCreate(db);
    }

    // 添加数据
    public long insert(Book book) {
        SQLiteDatabase db = getWritableDatabase();
        ContentValues values = new ContentValues();
        values.put(COLUMN_NAME, book.getName());
        values.put(COLUMN_AUTHOR, book.getAuthor());
        values.put(COLUMN_ISBN, book.getIsbn());
        values.put(COLUMN_STATUS, book.getStatus());
        long id = db.insert(TABLE_NAME, null, values);
        db.close();
        return id;
    }

    // 删除数据
    public int delete(int id) {
        SQLiteDatabase db = getWritableDatabase();
        String whereClause = COLUMN_ID + "=?";
        String[] whereArgs = new String[]{String.valueOf(id)};
        int rowsAffected = db.delete(TABLE_NAME, whereClause, whereArgs);
        db.close();
        return rowsAffected;
    }

    // 更新数据
    public int update(Book book) {
        SQLiteDatabase db = getWritableDatabase();
        ContentValues values = new ContentValues();
        values.put(COLUMN_NAME, book.getName());
        values.put(COLUMN_AUTHOR, book.getAuthor());
        values.put(COLUMN_ISBN, book.getIsbn());
        values.put(COLUMN_STATUS, book.getStatus());
        String whereClause = COLUMN_ID + "=?";
        String[] whereArgs = new String[]{String.valueOf(book.getId())};
        int rowsAffected = db.update(TABLE_NAME, values, whereClause, whereArgs);
        db.close();
        return rowsAffected;
    }

    // 查询所有数据
    public List<Book> queryAll() {
        SQLiteDatabase db = getReadableDatabase();
        List<Book> list = new ArrayList<>();
        Cursor cursor = db.query(TABLE_NAME, null, null, null, null, null, null);
        while (cursor.moveToNext()) {
            int id = cursor.getInt(cursor.getColumnIndex(COLUMN_ID));
            String name = cursor.getString(cursor.getColumnIndex(COLUMN_NAME));
            String author = cursor.getString(cursor.getColumnIndex(COLUMN_AUTHOR));
            String isbn = cursor.getString(cursor.getColumnIndex(COLUMN_ISBN));
            int status = cursor.getInt(cursor.getColumnIndex(COLUMN_STATUS));
            Book book = new Book(id, name, author, isbn, status);
            list.add(book);
        }
        cursor.close();
        db.close();
        return list;
    }

    // 根据ID查询数据
    public Book queryById(int id) {
        SQLiteDatabase db = getReadableDatabase();
        String selection = COLUMN_ID + "=?";
        String[] selectionArgs = new String[]{String.valueOf(id)};
        Cursor cursor = db.query(TABLE_NAME, null, selection, selectionArgs, null, null, null);
        Book book = null;
        if (cursor.moveToFirst()) {
            String name = cursor.getString(cursor.getColumnIndex(COLUMN_NAME));
            String author = cursor.getString(cursor.getColumnIndex(COLUMN_AUTHOR));
            String isbn = cursor.getString(cursor.getColumnIndex(COLUMN_ISBN));
            int status = cursor.getInt(cursor.getColumnIndex(COLUMN_STATUS));
            book = new Book(id, name, author, isbn, status);
        }
        cursor.close();
        db.close();
        return book;
    }

}

2. 网络请求操作

使用OkHttp进行网络请求：

public class HttpUtil {

    public static void sendOkHttpRequest(String address, Callback callback) {
        OkHttpClient client = new OkHttpClient();
        Request request = new Request.Builder()
                .url(address)
                .build();
        client.newCall(request).enqueue(callback);
    }

}

3. Service组件操作

创建Service类：

public class MyService extends Service {

    private static final String TAG = "MyService";

    @Override
    public void onCreate() {
        super.onCreate();
        Log.d(TAG, "onCreate");
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.d(TAG, "onStartCommand");
        // 执行后台任务
        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.d(TAG, "onDestroy");
    }

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

}

4. Broadcast Receiver操作

创建BroadcastReceiver类：

public class MyReceiver extends BroadcastReceiver {

    private static final String TAG = "MyReceiver";

    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        if (action.equals(Intent.ACTION_SCREEN_ON)) {
            Log.d(TAG, "Screen is on");
        } else if (action.equals(Intent.ACTION_SCREEN_OFF)) {
            Log.d(TAG, "Screen is off");
        }
    }

}

希望这些代码能够帮助您更好地进行开发。