SimpleGestureListner cannot be resolved to a type

1public class SwipeScreenExample extends Activity implements SimpleGestureListner{ 2 private simpleGestureFilter detector; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.swipe_screen); // Detect touched area detector = new SimpleGestureFilter(this,this); } @Override public boolean dispatchTouchEvent(MotionEvent me){ // Call onTouchEvent of SimpleGestureFilter class 3 this.detector.onTouchEvent(me); return super.dispatchTouchEvent(me); } public void onSwipe(int direction) { String str = ""; switch (direction) { case SimpleGestureFilter.SWIPE_RIGHT : str = "Swipe Right"; break; case SimpleGestureFilter.SWIPE_LEFT : str = "Swipe Left"; break; case SimpleGestureFilter.SWIPE_DOWN : str = "Swipe Down"; break; case SimpleGestureFilter.SWIPE_UP : str = "Swipe Up"; break; } Toast.makeText(this, str, Toast.LENGTH_SHORT).show(); } public void onDoubleTap() { Toast.makeText(this, "Double Tap", Toast.LENGTH_SHORT).show(); } }

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