安卓筆記俠

public class Book {

    //書名
    private String name;
    //書的圖片
    private int image;

    public Book(String name, int image) {
        this.name = name;
        this.image = image;
    }

public class BookModel {

    private static List<Book> list = new ArrayList<>();

    /**
     * 模擬本地數據庫
     */
    static {
        list.add(new Book("Java從入門到精通", R.drawable.java));
        list.add(new Book("Android從入門到精通", R.drawable.android));
        list.add(new Book("Java從入門到精通", R.drawable.java));
        list.add(new Book("Android從入門到精通", R.drawable.android));
    }

    /**
     * 添加書本
     * @param name
     * @param image
     */
    public void addBook(String name, int image) {
        list.add(new Book(name, image));
    }

    /**
     * 刪除書本
     */
    public void deleteBook( ) {
        list.remove(list.size() - 1);
    }

    /**
     * 查詢數據庫所有書本
     * @return
     */
    public List<Book> query() {
        return list;
    }

}

public class BookController {

    private BookModel mode;

    public BookController() {
        mode = new BookModel();
    }

    /**
     * 添加書本
     * @param listener
     */
    public void add(onAddBookListener listener) {
        mode.addBook("JavaWeb從入門到精通", R.drawable.javaweb);
        if (listener != null) {
            listener.onComplete();
        }
    }

    /**
     * 刪除書本
     * @param listener
     */
    public void delete(onDeleteBookListener listener) {
        if(mode.query().isEmpty()){
           return;
        }else{
            mode.deleteBook();
        }
        if (listener != null) {
            listener.onComplete();
        }
    }

    /**
     * 查詢所有書本
     * @return
     */
    public List<Book> query() {
        return mode.query();
    }

    /**
     * 添加成功的回調接口
     */
    public interface onAddBookListener {
        void onComplete();
    }

    /**
     * 刪除成功的回調接口
     */
    public interface onDeleteBookListener {
        void onComplete();
    }
}

public class BookActivity extends AppCompatActivity implements View.OnClickListener {

    private BookController bookController;

    private ListView lv_book;
    private List<Book> list;
    private BookAdapter adapter;
    private Button bt_add, bt_delete;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_book);
        lv_book = (ListView) findViewById(R.id.lv);
        bt_add = (Button) findViewById(R.id.bt_add);
        bt_delete = (Button) findViewById(R.id.bt_delete);
        bt_add.setOnClickListener(this);
        bt_delete.setOnClickListener(this);

        bookController = new BookController();
        list = bookController.query();
        adapter = new BookAdapter(this, list);
        lv_book.setAdapter(adapter);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            //添加書本按鈕
            case R.id.bt_add:
                bookController.add(new BookController.onAddBookListener() {
                    @Override
                    public void onComplete() {
                        adapter.notifyDataSetChanged();
                    }
                });
                break;
            //刪除書本按鈕
            case R.id.bt_delete:
                bookController.delete(new BookController.onDeleteBookListener() {
                    @Override
                    public void onComplete() {
                        adapter.notifyDataSetChanged();
                    }
                });
                break;
        }
    }
}