not detecting OnTouchListener for viewgroup with nestedscrollview and recycleviews

Question

I am adding touch listener to parent view for to detect swipe gestures. My layout has a nested scrollview and three recycleviews, but my touchevent does not get triggered, i think the parent doesn't get the touchIntercept. In this case i want the constraintLayout to handle the touch event.

XML

Activity

public class TableViewActivity extends BaseActivity implements CustomAdapterGames.OnGameClickListener {
    private ConstraintLayout constraintLayout;
  @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_table_view);

constraintLayout = findViewById(R.id.table_view_main_constraint_layout);

constraintLayout.requestDisallowInterceptTouchEvent(true);

    recyclerViewGames = findViewById(R.id.table_view_recycle_view_games);

    adapterOdds1 = new CustomAdapterOdds(this, Games, this, GamesHashMap.get(viewPagerColFirst), SitesList, viewPagerColFirst);

    configRecyclerViewGames(recyclerViewGames, adapterGames);


}
}

Ontouch Method

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

        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN: {
                downX = event.getX();
                downY = event.getY();
                //   return true;
            }
            case MotionEvent.ACTION_UP: {
                upX = event.getX();
                upY = event.getY();

                float deltaX = downX - upX;
                float deltaY = downY - upY;

                // swipe horizontal?
                if (Math.abs(deltaX) > MIN_DISTANCE) {
                    // left or right
                    if (deltaX < 0) {
                        Toast.makeText(TableViewActivity.this, "prev", Toast.LENGTH_SHORT).show();
                        return true;
                    }
                    if (deltaX > 0) {
                        Toast.makeText(TableViewActivity.this, "next", Toast.LENGTH_SHORT).show();
                        return true;
                    }
                } else {
                    Toast.makeText(TableViewActivity.this, "Swipe was only " + Math.abs(deltaX) + " long, need at least " + MIN_DISTANCE, Toast.LENGTH_SHORT).show();
                }

                // swipe vertical?
                if (Math.abs(deltaY) > MIN_DISTANCE) {
                    // top or down
                    if (deltaY < 0) {
                        return true;
                    }
                    if (deltaY > 0) {
                        return true;
                    }
                } else {
                    Toast.makeText(TableViewActivity.this, "Swipe was only " + Math.abs(deltaX) + " long, need at least " + MIN_DISTANCE, Toast.LENGTH_SHORT).show();
                }

                //     return true;
            }
        }
        return false;
    }

Amir Dora. · Accepted Answer

After spending hours on this task, I finally figured out what was causing the issue. I am posting answer so that others can benefit.

This is my OnSwipeTouchListener Class which detects touch events using GestureDetector

public class OnSwipeTouchListener implements View.OnTouchListener {
    public final GestureDetector gestureDetector;
    Context context;
    private OnSwipeListener onSwipeListener;


    OnSwipeTouchListener(Context ctx, View mainView, OnSwipeListener onSwipeListener ) {
        gestureDetector = new GestureDetector(ctx, new GestureListener());
        mainView.setOnTouchListener(this);
        context = ctx;
        this.constraintLayout=constraintLayout;
        this.onSwipeListener = onSwipeListener;
    }

    float firstTouchX;
    @Override
    public boolean onTouch(View v, MotionEvent event) {


        switch(event.getAction()) {
            case MotionEvent.ACTION_DOWN:

            default:
                break;
        }
        return gestureDetector.onTouchEvent(event);
    }

    public class GestureListener extends
            GestureDetector.SimpleOnGestureListener {
        private static final int SWIPE_THRESHOLD = 100;
        private static final int SWIPE_VELOCITY_THRESHOLD = 100;

        @Override
        public boolean onDown(MotionEvent e) {
            return true;
        }

        @Override
        public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
            boolean result = false;
            try {
                float diffY = e2.getY() - e1.getY();
                float diffX = e2.getX() - e1.getX();
                if (Math.abs(diffX) > Math.abs(diffY)) {
                    if (Math.abs(diffX) > SWIPE_THRESHOLD && Math.abs(velocityX) > SWIPE_VELOCITY_THRESHOLD) {
                        if (diffX > 0) {
                            onSwipeRight();
                        } else {
                            onSwipeLeft();
                        }
                        result = true;
                    }
                } else if (Math.abs(diffY) > SWIPE_THRESHOLD && Math.abs(velocityY) > SWIPE_VELOCITY_THRESHOLD) {
                    if (diffY > 0) {
                        //onSwipeBottom();
                    } else {
                        //onSwipeTop();
                    }
                    result = true;
                }
            } catch (Exception exception) {
                exception.printStackTrace();
            }
            return result;
        }
    }

    void onSwipeRight() {
        //Toast.makeText(context, "Swiped Right", Toast.LENGTH_SHORT).show();
        onSwipeListener.onRightwardsSwipe();

    }

    void onSwipeLeft() {
        //Toast.makeText(context, "Swiped Left", Toast.LENGTH_SHORT).show();
        onSwipeListener.onLeftwardsSwipe();
    }

  /*  void onSwipeTop() {
        //Toast.makeText(context, "Swiped Up", Toast.LENGTH_SHORT).show();
        onSwipeListener.onRightwardsSwipe();
    }

    void onSwipeBottom() {
        //Toast.makeText(context, "Swiped Down", Toast.LENGTH_SHORT).show();
        onSwipeListener.onRightwardsSwipe();
    }*/

}

Interface for OnSwipeListener which you can implement within your activity.

public interface OnSwipeListener
{
    //public void onUpwardsSwipe();
    //public void onDownwardsSwipe();
    public void onLeftwardsSwipe();
    public void onRightwardsSwipe();
}

You have to override gesture detector onTouchIntercept in your activity.

 @Override
    public boolean dispatchTouchEvent(MotionEvent event) {
        onSwipeTouchListener.gestureDetector.onTouchEvent(event);
        // Be sure to call the superclass implementation
        return super.dispatchTouchEvent(event);
    }

now you can use OnSwipeTouchListener for your view.

onSwipeTouchListener = new OnSwipeTouchListener(this, findViewById(R.id.nested_scroll_view), this);

not detecting OnTouchListener for viewgroup with nestedscrollview and recycleviews

Answers (1)

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