Okay I have been referencing the code here: https://stackoverflow.com/questions/937313/android-basic-gesture-detection 

but just can not get it to work. In my main activity I have a simple image defined. I want to detect a fling on the image. Here is my code below. The onclick method at the bottom is empty. Is it because of this? I left it blank because in the other code sample its not what I want. I just want a simple toast to pop up saying fling right or fling left.

    public class GestureRightLeft extends Activity implements OnClickListener  {
    
        ImageView peek;
    
        private static final int SWIPE_MIN_DISTANCE = 120;
        private static final int SWIPE_MAX_OFF_PATH = 250;
        private static final int SWIPE_THRESHOLD_VELOCITY = 200;
        private GestureDetector gestureDetector;
        View.OnTouchListener gestureListener;
    
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.main);
            
            peek =(ImageView) findViewById(R.id.peek);
            peek.setImageResource(R.drawable.bluestrip);
            
            gestureDetector = new GestureDetector(new MyGestureDetector());
            gestureListener = new View.OnTouchListener() {
                public boolean onTouch(View v, MotionEvent event) {
                    if (gestureDetector.onTouchEvent(event)) {
                        return true;
                    }
                    return false;
                }
            };
        }
    
        class MyGestureDetector extends SimpleOnGestureListener {
            @Override
            public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
                try {
                    if (Math.abs(e1.getY() - e2.getY()) &gt; SWIPE_MAX_OFF_PATH)
                        return false;
                    // right to left swipe
                    if(e1.getX() - e2.getX() &gt; SWIPE_MIN_DISTANCE &amp;&amp; Math.abs(velocityX) &gt; SWIPE_THRESHOLD_VELOCITY) {
                        Toast.makeText(GestureRightLeft.this, &quot;Left Swipe&quot;, Toast.LENGTH_SHORT).show();
                    }  else if (e2.getX() - e1.getX() &gt; SWIPE_MIN_DISTANCE &amp;&amp; Math.abs(velocityX) &gt; SWIPE_THRESHOLD_VELOCITY) {
                        Toast.makeText(GestureRightLeft.this, &quot;Right Swipe&quot;, Toast.LENGTH_SHORT).show();
                    }
                } catch (Exception e) {
                    // nothing
                }
                return false;
            }
        }
        
        @Override
        public void onClick(View v) {}
    }

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Adding Fling Gesture to an image view - Android