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java/com/example/ex4/JoystickActivity.java

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+package com.example.ex4;
+
+import androidx.appcompat.app.AppCompatActivity;
+import android.os.Bundle;
+
+public class JoystickActivity extends AppCompatActivity implements Joystick.JoystickListener
+{
+    @Override
+    protected void onCreate(Bundle savedInstanceState)
+    {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_joystick);
+    }
+    //method to handle OnJoystickMoved event
+    public void onJoystickMoved(float xPercent, float yPercent, int source)
+    {
+        UserHandler handler = UserHandler.getInstance();
+        handler.send_message(true, xPercent); //true is aileron
+        handler.send_message(false, yPercent); //false is elevator
+    }
+}