graph TD;
    A[启动应用] --> B[建立 WebSocket 连接]
    B --> C[接收实时股p数据]
    C --> D[更新 RecyclerView 显示数据]
    D --> E{检查自选股价格}
    E -- 达到提醒价格 --> F[发送通知]
    E -- 未达到提醒价格 --> G[继续接收数据]
    F --> G

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import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import okhttp3.WebSocket;
import okhttp3.WebSocketListener;

public class StockWebSocketListener extends WebSocketListener {
    private static final int NORMAL_CLOSURE_STATUS = 1000;

    @Override
    public void onOpen(WebSocket webSocket, Response response) {
        webSocket.send("SUBSCRIBE STOCKS");
    }

    @Override
    public void onMessage(WebSocket webSocket, String text) {
        // Handle the incoming stock data
    }

    @Override
    public void onClosing(WebSocket webSocket, int code, String reason) {
        webSocket.close(NORMAL_CLOSURE_STATUS, null);
    }

    @Override
    public void onFailure(WebSocket webSocket, Throwable t, Response response) {
        t.printStackTrace();
    }
}

// Usage in your main activity or service
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder().url("wss://your.websocket.url").build();
StockWebSocketListener listener = new StockWebSocketListener();
WebSocket ws = client.newWebSocket(request, listener);
client.dispatcher().executorService().shutdown();
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public class StockAdapter extends RecyclerView.Adapter<StockAdapter.StockViewHolder> {
    private List<Stock> stockList;

    public StockAdapter(List<Stock> stockList) {
        this.stockList = stockList;
    }

    @NonNull
    @Override
    public StockViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.stock_item, parent, false);
        return new StockViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(@NonNull StockViewHolder holder, int position) {
        Stock stock = stockList.get(position);
        holder.bind(stock);
    }

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

    public void updateStocks(List<Stock> newStockList) {
        this.stockList = newStockList;
        notifyDataSetChanged();
    }

    class StockViewHolder extends RecyclerView.ViewHolder {
        TextView stockName;
        TextView stockPrice;

        StockViewHolder(View itemView) {
            super(itemView);
            stockName = itemView.findViewById(R.id.stock_name);
            stockPrice = itemView.findViewById(R.id.stock_price);
        }

        void bind(Stock stock) {
            stockName.setText(stock.getName());
            stockPrice.setText(String.valueOf(stock.getPrice()));
        }
    }
}
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private void sendNotification(String stockName, double currentPrice) {
    NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    String channelId = "stock_channel_id";
    CharSequence name = "Stock Notification Channel";
    String description = "Channel for stock price notifications";
    int importance = NotificationManager.IMPORTANCE_DEFAULT;

    NotificationChannel channel = new NotificationChannel(channelId, name, importance);
    channel.setDescription(description);
    notificationManager.createNotificationChannel(channel);

    NotificationCompat.Builder builder = new NotificationCompat.Builder(this, channelId)
            .setSmallIcon(R.drawable.ic_stock_notification)
            .setContentTitle("Stock Price Alert")
            .setContentText(stockName + " has reached $" + currentPrice)
            .setPriority(NotificationCompat.PRIORITY_DEFAULT);

    notificationManager.notify(1, builder.build());
}
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@Test
public void testWebSocketConnection() {
    // Write test cases to ensure WebSocket connection is established successfully
}

@Test
public void testRecyclerViewUpdate() {
    // Simulate receiving stock data and check if RecyclerView updates correctly
}

@Test
public void testNotificationTrigger() {
    // Simulate stock price reaching threshold and check if a notification is sent
}
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