How to detect the swipe left or Right in Android?

You should be extend a class from View.OnTouchListener and handle the onTouch method by overriding it.

interface SwipeListener {
    fun onSwipeLeft()
    fun onSwipeRight()
}

class SwipeGestureListener internal constructor(
    private val listener: SwipeListener,
    private val minDistance: Int = DEFAULT_SWIPE_MIN_DISTANCE
) : View.OnTouchListener {
    companion object {
        const val DEFAULT_SWIPE_MIN_DISTANCE = 200
    }

    private var anchorX = 0F

    override fun onTouch(view: View, event: MotionEvent): Boolean {
        when (event.action) {
            MotionEvent.ACTION_DOWN -> {
                anchorX = event.x
                return true
            }
            MotionEvent.ACTION_UP -> {
                if (abs(event.x - anchorX) > minDistance) {
                    if (event.x > anchorX) {
                        listener.onSwipeRight()
                    } else {
                        listener.onSwipeLeft()
                    }
                }
                return true
            }
        }
        return view.performClick()
    }
}

You can just easily implement it like this in your Activity or Fragment.

class MainActivity : AppCompatActivity(), SwipeListener {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        viewGroup.setOnTouchListener(SwipeGestureListener(this))
    }

    override fun onSwipeLeft() {
        Toast.makeText(this, "Swipe Left", Toast.LENGTH_SHORT).show()
    }

    override fun onSwipeRight() {
        Toast.makeText(this, "Swipe Right", Toast.LENGTH_SHORT).show()
    }
}

this should help you maybe...

private final GestureDetector.SimpleOnGestureListener onGestureListener = new GestureDetector.SimpleOnGestureListener() {
    @Override
    public boolean onDoubleTap(MotionEvent e) {
        Log.i("gestureDebug333", "doubleTapped:" + e);
        return super.onDoubleTap(e);
    }

    @Override
    public boolean onDoubleTapEvent(MotionEvent e) {
        Log.i("gestureDebug333", "doubleTappedEvent:" + e);

        return super.onDoubleTapEvent(e);
    }

    @Override
    public boolean onDown(MotionEvent e) {
        Log.i("gestureDebug333", "onDown:" + e);


        return super.onDown(e);

    }

    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {


        Log.i("gestureDebug333", "flinged:" + e1 + "---" + e2);
        Log.i("gestureDebug333", "fling velocity:" + velocityX + "---" + velocityY);
        if (e1.getAction() == MotionEvent.ACTION_DOWN && e1.getX() > (e2.getX() + 300)){
           // Toast.makeText(context, "flinged right to left", Toast.LENGTH_SHORT).show();
            goForward();
        }
        if (e1.getAction() == MotionEvent.ACTION_DOWN && e2.getX() > (e1.getX() + 300)){
            //Toast.makeText(context, "flinged left to right", Toast.LENGTH_SHORT).show();
            goBack();
        }
        return super.onFling(e1, e2, velocityX, velocityY);
    }

    @Override
    public void onLongPress(MotionEvent e) {
        super.onLongPress(e);
    }

    @Override
    public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
        return super.onScroll(e1, e2, distanceX, distanceY);
    }

    @Override
    public void onShowPress(MotionEvent e) {
        super.onShowPress(e);
    }

    @Override
    public boolean onSingleTapConfirmed(MotionEvent e) {
        return super.onSingleTapConfirmed(e);
    }

    @Override
    public boolean onSingleTapUp(MotionEvent e) {
        return super.onSingleTapUp(e);
    }
};

here is generic swipe left detector for any view in kotlin using databinding

@BindingAdapter("onSwipeLeft")
fun View.setOnSwipeLeft(runnable: Runnable) {
    setOnTouchListener(object : View.OnTouchListener {
        var x0 = 0F; var y0 = 0F; var t0 = 0L
        val defaultClickDuration = 200

        override fun onTouch(v: View?, motionEvent: MotionEvent?): Boolean {
            motionEvent?.let { event ->
                when(event.action) {
                    MotionEvent.ACTION_DOWN -> {
                        x0 = event.x; y0 = event.y; t0 = System.currentTimeMillis()
                    }
                    MotionEvent.ACTION_UP -> {
                        val x1 = event.x; val y1 = event.y; val t1 = System.currentTimeMillis()

                        if (x0 == x1 && y0 == y1 && (t1 - t0) < defaultClickDuration) {
                            performClick()
                            return false
                        }
                        if (x0 > x1) { runnable.run() }
                    }
                    else -> {}
                }
            }
            return true
        }
    })
}

and then to use it in your layout:

app:onSwipeLeft="@{() -> viewModel.swipeLeftHandler()}"

Short and easy version:

1. First create this abstract class

public abstract class HorizontalSwipeListener implements View.OnTouchListener {

    private float firstX;
    private int minDistance;

    HorizontalSwipeListener(int minDistance) {
        this.minDistance = minDistance;
    }

    abstract void onSwipeRight();

    abstract void onSwipeLeft();

    @Override
    public boolean onTouch(View view, MotionEvent event) {

        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                firstX = event.getX();
                return true;
            case MotionEvent.ACTION_UP:
                float secondX = event.getX();
                if (Math.abs(secondX - firstX) > minDistance) {
                    if (secondX > firstX) {
                        onSwipeLeft();
                    } else {
                        onSwipeRight();
                    }
                }
                return true;
        }
        return view.performClick();
    }

}

2.Then create a concrete class implementing what you need:

public class SwipeListener extends HorizontalSwipeListener {

    public SwipeListener() {
        super(200);
    }

    @Override
    void onSwipeRight() {
        System.out.println("right");
    }

    @Override
    void onSwipeLeft() {
        System.out.println("left");
    }

}