graph TD;
    A[启动应用] --> B[初始化UI组件]
    B --> C[发起新闻API请求]
    C --> D[接收并解析JSON数据]
    D --> E[更新RecyclerView]
    E --> F{用户操作}
    F -- 分类浏览 --> G[过滤新闻数据]
    F -- 搜索 --> H[搜索新闻数据]
    G --> I[更新RecyclerView]
    H --> I[更新RecyclerView]
    F -- 点击新闻条目 --> J[显示新闻详情]
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public class MainActivity extends Activity {
    private RecyclerView recyclerView;
    private NewsAdapter newsAdapter;
    private ArrayList<News> newsList = new ArrayList<>();
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // 初始化UI组件
        recyclerView = findViewById(R.id.recycler_view);
        newsAdapter = new NewsAdapter(newsList);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        recyclerView.setAdapter(newsAdapter);

        fetchNews();
    }

    private void fetchNews() {
        String url = "https://example.com/newsapi";
        
        OkHttpClient client = new OkHttpClient();
        Request request = new Request.Builder().url(url).build();
        client.newCall(request).enqueue(new Callback() {
            @Override
            public void onResponse(Call call, Response response) throws IOException {
                String jsonData = response.body().string();
                parseJSON(jsonData);
            }

            @Override
            public void onFailure(Call call, IOException e) {
                e.printStackTrace();
            }
        });
    }

    private void parseJSON(String jsonData) {
        try {
            JSONObject jsonObject = new JSONObject(jsonData);
            JSONArray articles = jsonObject.getJSONArray("articles");
            for (int i = 0; i < articles.length(); i++) {
                JSONObject article = articles.getJSONObject(i);
                String title = article.getString("title");
                String description = article.getString("description");
                String urlToImage = article.getString("urlToImage");

                newsList.add(new News(title, description, urlToImage));
            }
            runOnUiThread(() -> newsAdapter.notifyDataSetChanged());
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }
}
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public class NewsAdapter extends RecyclerView.Adapter<NewsAdapter.ViewHolder> {
    private List<News> newsList;

    public NewsAdapter(List<News> newsList) {
        this.newsList = newsList;
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.news_item, parent, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        News news = newsList.get(position);
        holder.title.setText(news.getTitle());
        holder.description.setText(news.getDescription());
        Picasso.get().load(news.getUrlToImage()).into(holder.image);
    }

    @Override
    public int getItemCount() {
        return newsList.size();
    }

    public static class ViewHolder extends RecyclerView.ViewHolder {
        TextView title, description;
        ImageView image;

        public ViewHolder(View itemView) {
            super(itemView);
            title = itemView.findViewById(R.id.news_title);
            description = itemView.findViewById(R.id.news_description);
            image = itemView.findViewById(R.id.news_image);
        }
    }
}
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public class News {
    private String title;
    private String description;
    private String urlToImage;

    public News(String title, String description, String urlToImage) {
        this.title = title;
        this.description = description;
        this.urlToImage = urlToImage;
    }

    public String getTitle() { return title; }
    public String getDescription() { return description; }
    public String getUrlToImage() { return urlToImage; }
}
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public class MainActivityTest {
  
    @Test
    public void testFetchNews() {
        MainActivity mainActivity = new MainActivity();
        mainActivity.fetchNews();
        assertFalse(mainActivity.newsList.isEmpty());
    }

    @Test
    public void testParseJSON() {
        MainActivity mainActivity = new MainActivity();
        String mockJson = "{ \"articles\": [{ \"title\": \"Test Title\", \"description\": \"Test Description\", \"urlToImage\": \"http://test.com/image.jpg\" }] }";
        mainActivity.parseJSON(mockJson);

        assertEquals(1, mainActivity.newsList.size());
        assertEquals("Test Title", mainActivity.newsList.get(0).getTitle());
    }
}
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