How to Detect Long Clicks in Android Using OpenGL-ES

To detect when the user presses a surface being rendered by an OpenGL-ES application, developers typically use the onTouchEvent(MotionEvent event) method. However, this method does not have built-in functionality for detecting long clicks.

One approach is to register for the ACTION_DOWN event. Then, in onTouchEvent, schedule a Runnable to run after a certain time delay. If the Runnable is canceled before it runs, due to an ACTION_UP or ACTION_MOVE event, it indicates that the user did not perform a long click.

Alternatively, Android provides a more sophisticated solution: GestureDetector, which can be used to detect a variety of gestures, including long clicks.

Using GestureDetector

To use GestureDetector, follow these steps:

1. Create an instance of GestureDetector.
2. Override the onTouchEvent method in your activity or fragment.
3. In onTouchEvent, pass the touch event to the GestureDetector instance using gestureDetector.onTouchEvent(event).
4. Register a OnGestureListener with the GestureDetector to detect long clicks.

Here is an example of using GestureDetector to detect long clicks:

class MyActivity : AppCompatActivity() {

  private lateinit var gestureDetector: GestureDetector

  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    gestureDetector = GestureDetector(this, LongClickListener())
  }

  override fun onTouchEvent(event: MotionEvent): Boolean {
    gestureDetector.onTouchEvent(event)
    return super.onTouchEvent(event)
  }

  inner class LongClickListener : OnGestureListener {

    override fun onLongPress(e: MotionEvent?) {
      // Handle long click here.
    }

    // Implement other gesture methods as needed.
  }
}

By using GestureDetector, you can easily detect long clicks in your OpenGL-ES applications.