Android Recycler Pagination:Room + RxJava + MVP
创始人
2024-08-15 05:30:07
0

下面是一个使用Room数据库、RxJava和MVP架构实现Android Recycler Pagination的解决方案的代码示例。

  1. 首先,创建一个数据模型类(例如,Article)来表示列表中的每个项目。
@Entity(tableName = "articles")
public class Article {
    @PrimaryKey
    public int id;
    public String title;
    public String content;
}
  1. 创建一个DAO接口(例如,ArticleDao)来定义对数据库的操作方法。
@Dao
public interface ArticleDao {
    @Query("SELECT * FROM articles")
    Flowable> getAllArticles();

    @Insert(onConflict = OnConflictStrategy.REPLACE)
    void insertArticles(List
articles); }
  1. 创建一个数据库类(例如,AppDatabase)来初始化Room数据库和获取DAO对象。
@Database(entities = {Article.class}, version = 1)
public abstract class AppDatabase extends RoomDatabase {
    public abstract ArticleDao articleDao();

    private static AppDatabase instance;

    public static AppDatabase getInstance(Context context) {
        if (instance == null) {
            instance = Room.databaseBuilder(context.getApplicationContext(), AppDatabase.class, "my_db")
                    .build();
        }
        return instance;
    }
}
  1. 创建一个Presenter类(例如,ArticlePresenter)来处理数据逻辑和与数据库交互。
public class ArticlePresenter {
    private ArticleView view;
    private ArticleDao articleDao;

    public ArticlePresenter(ArticleView view, ArticleDao articleDao) {
        this.view = view;
        this.articleDao = articleDao;
    }

    public void loadArticles(int page) {
        articleDao.getAllArticles()
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(articles -> view.showArticles(articles), throwable -> view.showError(throwable.getMessage()));
    }
}
  1. 创建一个View接口(例如,ArticleView)来定义显示数据的方法。
public interface ArticleView {
    void showArticles(List
articles); void showError(String error); }
  1. 在Activity或Fragment中实现ArticleView接口,并初始化Presenter和RecyclerView。
public class MainActivity extends AppCompatActivity implements ArticleView {
    private RecyclerView recyclerView;
    private ArticleAdapter articleAdapter;
    private ArticlePresenter articlePresenter;

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

        recyclerView = findViewById(R.id.recyclerView);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        articleAdapter = new ArticleAdapter();
        recyclerView.setAdapter(articleAdapter);

        ArticleDao articleDao = AppDatabase.getInstance(this).articleDao();
        articlePresenter = new ArticlePresenter(this, articleDao);
        articlePresenter.loadArticles(1);
    }

    @Override
    public void showArticles(List
articles) { articleAdapter.setArticles(articles); } @Override public void showError(String error) { Toast.makeText(this, "Error: " + error, Toast.LENGTH_SHORT).show(); } }
  1. 创建一个适配器类(例如,ArticleAdapter)来显示列表数据。
public class ArticleAdapter extends RecyclerView.Adapter {
    private List
articles = new ArrayList<>(); public void setArticles(List
articles) { this.articles = articles; notifyDataSetChanged(); } @NonNull @Override public ArticleViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) { View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_article, parent, false); return new ArticleViewHolder(view); } @Override public void onBindViewHolder(@NonNull ArticleViewHolder holder, int position) { Article article = articles.get(position); holder.titleTextView.setText(article.title); holder.contentTextView.setText(article.content); } @Override public int getItemCount() { return articles.size(); } static class ArticleViewHolder extends RecyclerView.ViewHolder { TextView titleTextView; TextView contentTextView; ArticleViewHolder(View itemView) { super(itemView); titleTextView = itemView.findViewById(R.id.titleTextView); contentTextView = itemView.findViewById(R.id.contentTextView); } } }

这就是一个使用Room数据库、RxJava和MVP架构实现Android Recycler Pagination的解决方案的代码示例。在这个示例中,使用Room数据库来存储和检索数据,使用RxJava来处理异步操作,并使用MVP架构来分离数据逻辑和视图逻辑。

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