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java/com/example/ex4/MainActivity.java

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+package com.example.ex4;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+import android.content.Intent;
+import android.os.Bundle;
+import android.view.View;
+import android.widget.Button;
+import android.widget.EditText;
+
+public class MainActivity extends AppCompatActivity implements View.OnClickListener
+{
+    @Override
+    protected void onCreate(Bundle savedInstanceState)
+    {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+        //assign the onClick as the one to be executed once the connect button is pressed
+        Button connect_button = findViewById(R.id.connect_button);
+        connect_button.setOnClickListener(this);
+    }
+    //onClick method of the connect button
+    public void onClick(View view)
+    {
+        EditText[] values = new EditText[]{findViewById(R.id.ip_val),findViewById(R.id.port_val)};
+        UserHandler.getInstance().connect(values[0].getText().toString(),
+                Integer.parseInt(values[1].getText().toString()));
+        startActivity(new Intent(this, JoystickActivity.class));
+    }
+}