[android] Android에서 왼쪽 또는 오른쪽으로 스 와이프를 감지하는 방법은 무엇입니까?

이것은 내가 사용하는 귀여운 클래스입니다 (View에서 이벤트를 포착하려는 경우 ViewGroup 인 경우 두 번째 구현을 사용합니다).

import android.util.Log;
import android.view.MotionEvent;
import android.view.View;

public class SwipeDetector implements View.OnTouchListener{

    private int min_distance = 100;
    private float downX, downY, upX, upY;
    private View v;

    private onSwipeEvent swipeEventListener;



    public SwipeDetector(View v){
        this.v=v;
        v.setOnTouchListener(this);
    }

    public void setOnSwipeListener(onSwipeEvent listener)
    {
        try{
            swipeEventListener=listener;
        }
        catch(ClassCastException e)
        {
            Log.e("ClassCastException","please pass SwipeDetector.onSwipeEvent Interface instance",e);
        }
    }


    public void onRightToLeftSwipe(){
        if(swipeEventListener!=null)
            swipeEventListener.SwipeEventDetected(v,SwipeTypeEnum.RIGHT_TO_LEFT);
        else
            Log.e("SwipeDetector error","please pass SwipeDetector.onSwipeEvent Interface instance");
    }

    public void onLeftToRightSwipe(){
        if(swipeEventListener!=null)
            swipeEventListener.SwipeEventDetected(v,SwipeTypeEnum.LEFT_TO_RIGHT);
        else
            Log.e("SwipeDetector error","please pass SwipeDetector.onSwipeEvent Interface instance");
    }

    public void onTopToBottomSwipe(){
        if(swipeEventListener!=null)
            swipeEventListener.SwipeEventDetected(v,SwipeTypeEnum.TOP_TO_BOTTOM);
        else
            Log.e("SwipeDetector error","please pass SwipeDetector.onSwipeEvent Interface instance");
    }

    public void onBottomToTopSwipe(){
        if(swipeEventListener!=null)
            swipeEventListener.SwipeEventDetected(v,SwipeTypeEnum.BOTTOM_TO_TOP);
        else
            Log.e("SwipeDetector error","please pass SwipeDetector.onSwipeEvent Interface instance");
    }

    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;

            //HORIZONTAL SCROLL
            if(Math.abs(deltaX) > Math.abs(deltaY))
            {
                if(Math.abs(deltaX) > min_distance){
                    // left or right
                    if(deltaX < 0)
                    {
                        this.onLeftToRightSwipe();
                        return true;
                    }
                    if(deltaX > 0) {
                        this.onRightToLeftSwipe();
                        return true;
                    }
                }
                else {
                    //not long enough swipe...
                    return false;
                }
            }
            //VERTICAL SCROLL
            else
            {
                if(Math.abs(deltaY) > min_distance){
                    // top or down
                    if(deltaY < 0)
                    { this.onTopToBottomSwipe();
                    return true;
                    }
                    if(deltaY > 0)
                    { this.onBottomToTopSwipe();
                    return true;
                    }
                }
                else {
                    //not long enough swipe...
                    return false;
                }
            }

            return true;
        }
        }
        return false;
    }
    public interface onSwipeEvent
    {
        public void SwipeEventDetected(View v, SwipeTypeEnum SwipeType);
    }

    public SwipeDetector setMinDistanceInPixels(int min_distance)
{
    this.min_distance=min_distance;
    return this;
}

    public enum SwipeTypeEnum
    {
        RIGHT_TO_LEFT,LEFT_TO_RIGHT,TOP_TO_BOTTOM,BOTTOM_TO_TOP
    }

}

그리고 이것은 사용 예입니다.

filters_container=(RelativeLayout)root.findViewById(R.id.filters_container);
    new SwipeDetector(filters_container).setOnSwipeListener(new SwipeDetector.onSwipeEvent() {
        @Override
        public void SwipeEventDetected(View v, SwipeDetector.SwipeTypeEnum swipeType) {
            if(swipeType==SwipeDetector.SwipeTypeEnum.LEFT_TO_RIGHT)
                getActivity().onBackPressed();
        }
    });

어떤 경우에는 컨테이너에서 스 와이프 제스처를 감지하고 터치 이벤트를 자식에게 전달하고 싶을 때 사용자 지정보기 그룹을 만들고 RelativeLayout이라고 말하고 onInterceptTouchEvent를 재정의하면 여기에서 스 와이프 이벤트를 감지 할 수 있습니다. 자녀보기에 대한 터치 이벤트 전달을 차단하지 않고 예를 들면 다음과 같습니다.

    import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.RelativeLayout;


public class SwipeDetectRelativeLayout extends RelativeLayout {


    private float x1,x2;
    static final int MIN_DISTANCE=150;
    private onSwipeEventDetected mSwipeDetectedListener;


    public SwipeDetectRelativeLayout(Context context) {
        super(context);
    }

    public SwipeDetectRelativeLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public SwipeDetectRelativeLayout(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {

        switch(ev.getAction())
        {
            case MotionEvent.ACTION_DOWN:
                x1 = ev.getX();
                break;
            case MotionEvent.ACTION_UP:
                x2 = ev.getX();
                float deltaX = x2 - x1;
                if (Math.abs(deltaX) > MIN_DISTANCE)
                {
                        //swiping right to left
                        if(deltaX<0)
                        {
                            if(mSwipeDetectedListener!=null)
                                mSwipeDetectedListener.swipeEventDetected();
                        }
                }
                break;
        }
        return super.onInterceptTouchEvent(ev);
    }

    public interface onSwipeEventDetected
    {
        public void swipeEventDetected();
    }

    public void registerToSwipeEvents(onSwipeEventDetected listener)
    {
        this.mSwipeDetectedListener=listener;
    }
}