appBackend.java

package com.example.draftfinal;

import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

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

public class MainActivity extends AppCompatActivity {

    private static final String TAG = "WebSocketApp";
    private static final String WEBSOCKET_URL = "ws://192.168.247.252:8080"; // Replace with your server IP
    private WebSocket webSocket;
    private TextView textView;

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

        textView = findViewById(R.id.textView);

        // Initialize WebSocket connection
        OkHttpClient client = new OkHttpClient();
        Request request = new Request.Builder().url(WEBSOCKET_URL).build();

        webSocket = client.newWebSocket(request, new WebSocketListener() {
            @Override
            public void onOpen(WebSocket webSocket, Response response) {
                super.onOpen(webSocket, response);
                Log.d(TAG, "WebSocket connected");
            }

            @Override
            public void onMessage(WebSocket webSocket, String text) {
                super.onMessage(webSocket, text);
                Log.d(TAG, "Message received: " + text);

                // Update the UI with the received message
                runOnUiThread(() -> textView.setText(text));
            }

            @Override
            public void onFailure(WebSocket webSocket, Throwable t, Response response) {
                super.onFailure(webSocket, t, response);
                Log.e(TAG, "WebSocket error", t);
            }

            @Override
            public void onClosed(WebSocket webSocket, int code, String reason) {
                super.onClosed(webSocket, code, reason);
                Log.d(TAG, "WebSocket closed: " + reason);
            }
        });
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (webSocket != null) {
            webSocket.close(1000, "App closed");
        }
    }
}