MDT5_1_Ueberwachungssystem_G1/app/src/main/java/com/example/ueberwachungssystem/MainActivity.java

package com.example.ueberwachungssystem;
import android.annotation.SuppressLint;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.UnknownHostException;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;

@SuppressLint("SetTextI18n")
public class MainActivity extends AppCompatActivity {
    TextView tvMessages;
    TextView tvConnectionInfos;

    WifiCommunication communication;
    public static String SERVER_IP = "";
    public static final int SERVER_PORT = 2222;
    int i=0;

    boolean sending = false;

    String message;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tvMessages = findViewById(R.id.tvMessages);
        tvConnectionInfos = findViewById(R.id.tvConnectionInfos);
        try {
            SERVER_IP = getLocalIpAddress();
            tvConnectionInfos.setText("Connection Infos: \n Own IP-Adress: " + SERVER_IP+ " Port: " + SERVER_PORT);
        } catch (UnknownHostException e) {
            e.printStackTrace();
        }
        Button btnSend = findViewById(R.id.btnSend);
        btnSend.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                i++;
                communication.sendTrue("Test" +i);
            }
        });
    }
    protected void onResume() {
        super.onResume();
        communication = new WifiCommunication(MainActivity.this, SERVER_PORT);

    }
    @Override
    protected void onPause() {
        super.onPause();
        communication.stopCommunication();
    }
    private String getLocalIpAddress() throws UnknownHostException {
        WifiManager wifiManager = (WifiManager) getApplicationContext().getSystemService(WIFI_SERVICE);
        assert wifiManager != null;
        WifiInfo wifiInfo = wifiManager.getConnectionInfo();
        int ipInt = wifiInfo.getIpAddress();
        return InetAddress.getByAddress(ByteBuffer.allocate(4).order(ByteOrder.LITTLE_ENDIAN).putInt(ipInt).array()).getHostAddress();
    }
}