HarmonyOS listens for sliding events left, right, up, down, and the meaning of the return value

     btn2.setTouchEventListener(new Component.TouchEventListener() {
            @Override
            public boolean onTouchEvent(Component component, TouchEvent touchEvent) {
                //参数1 代表手指的索引 单手指传递0就好了
                MmiPoint pointerPosition = touchEvent.getPointerPosition(0);
                float x = pointerPosition.getX();
                float y = pointerPosition.getY();
                int action = touchEvent.getAction();
                switch (action) {
                    //按下
                    case TouchEvent.PRIMARY_POINT_DOWN:
                        startX = x;
                        startY = y;
                        btn2.setText("按下(" + x + "," + y + ")");
                        break;
                    //弹起
                    case TouchEvent.PRIMARY_POINT_UP:
//                        btn2.setText("弹起(" + x + "," + y + ")");
                        break;
                    //滑动
                    case TouchEvent.POINT_MOVE:
//                        btn2.setText("滑动"+count);
                        endX = x;
                        endY = y;
                        //右滑动 控制左边滑动浮动不超过100
                        if (endX > startX && Math.abs(endX - endY) < 100) {

                            btn2.setText("右滑(" + x + "," + y + ")");
                        } else if (endX < startX && Math.abs(endX - endY) < 100) {
                            btn2.setText("左滑(" + x + "," + y + ")");
                        } else if (endY > startY && Math.abs(endX - startX) < 100) {
                            btn2.setText("下滑(" + x + "," + y + ")");
                        } else if (endY < startY && Math.abs(endX - startX) < 100) {
                            btn2.setText("上滑(" + x + "," + y + ")");
                        }
                        break;

                }
                // 返回为true 所有动作都会执行并返回代码
                // 返回false 表示只有一个动作会触发当前方法并执行对应代码
                return true;
            }
        });

Swipe the black area to change

A 100 is written to prevent the situation where it is clearly a left slide but it will be judged as a right slide. Can be rewritten according to your actual needs

// return true all actions will be executed and return code 
// return false means only one action will trigger the current method and execute the corresponding code 
return true;