java - 使用滑动手势向上/向下移动对象

Question

我正在尝试在 max_height 和 min_height 值之间移动一个对象，我找到了一段代码并尝试对其进行调整，但是该对象( CardView)在屏幕的整个高度移动，当我尝试移动对象在移动之前重新出现在另一个位置时，我不知道如何使其适应我的需求，有什么想法吗？

public interface OnLayoutCloseListener {
    void OnLayoutClosed();
}

enum Direction {
    UP_DOWN,
    LEFT_RIGHT,
    NONE
}
private Direction direction = Direction.NONE;
private int previousFingerPositionY;
private int previousFingerPositionX;
private int baseLayoutPosition;
private boolean isScrollingUp;
private boolean isLocked = false;
private OnLayoutCloseListener listener;

@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {

    if (isLocked) {
        return false;
    } else {
        final int y = (int) ev.getRawY();
        final int x = (int) ev.getRawX();


        if (ev.getActionMasked() == MotionEvent.ACTION_DOWN) {

            previousFingerPositionX = x;
            previousFingerPositionY = y;

        } else if (ev.getActionMasked() == MotionEvent.ACTION_MOVE) {


            int diffY = y - previousFingerPositionY;
            int diffX = x - previousFingerPositionX;

            if (Math.abs(diffX) + 50 < Math.abs(diffY)) {
                return true;
            }

        }

        return false;
    }

}

@Override
public boolean onTouchEvent(MotionEvent ev) {

    if (!isLocked) {

        final int y = (int) ev.getRawY();
        final int x = (int) ev.getRawX();

        if (ev.getActionMasked() == MotionEvent.ACTION_DOWN) {

            previousFingerPositionX = x;
            previousFingerPositionY = y;
            baseLayoutPosition = (int) this.getY();

        } else if (ev.getActionMasked() == MotionEvent.ACTION_MOVE) {


            int diffY = y - previousFingerPositionY;
            int diffX = x - previousFingerPositionX;

            if (direction == Direction.NONE) {
                if (Math.abs(diffX) > Math.abs(diffY)) {
                    direction = Direction.LEFT_RIGHT;
                } else if (Math.abs(diffX) < Math.abs(diffY)) {
                    direction = Direction.UP_DOWN;
                } else {
                    direction = Direction.NONE;
                }
            }

            if (direction == Direction.UP_DOWN) {
                isScrollingUp = diffY <= 0;

                this.setY(baseLayoutPosition + diffY);
                requestLayout();
                return true;
            }

        } else if (ev.getActionMasked() == MotionEvent.ACTION_UP) {

            if (direction == Direction.UP_DOWN) {

                if (isScrollingUp) {

                    //Calculates height according to my needs
                    int max_height = height - (card.getHeight() + toolbar.getHeight());

                    if (Math.abs(this.getY()) > max_height) {

                        if (listener != null) {
                            listener.OnLayoutClosed();
                        }

                    }

                } else {

                    //Calculates height according to my needs
                    int min_height = height - ((int)(toolbar.getHeight() * 1.7));
                    if (Math.abs(this.getY()) > min_height) {
                        if (listener != null) {
                            listener.OnLayoutClosed();
                        }

                    }

                }

                ObjectAnimator positionAnimator = ObjectAnimator.ofFloat(card, "y", this.getY(), 0);
                positionAnimator.setDuration(0);
                positionAnimator.start();

                direction = Direction.NONE;
                return true;
            }

            direction = Direction.NONE;
        }

        return true;

    }

    return false;
}

public void setOnLayoutCloseListener(OnLayoutCloseListener closeListener) {
    this.listener = closeListener;
}

public void lock() {
    isLocked = true;
}

public void unLock() {
    isLocked = false;
}

更新解决方案:

在卡片的任何实例处重置LayoutParam:

card.setLayoutParams(new FrameLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));

使用此代码在 min_height 和 max_height 之间 ScrollView

private int previousFingerPositionY;
private int previousFingerPositionX;
int min_height = 500;
int max_height = 100;
int pressedy;
int viewMariginY;

private boolean isLocked = false;
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
    if (isLocked) {
        return false;
    } else {
        final int y = (int) ev.getRawY();
        final int x = (int) ev.getRawX();
        if (ev.getActionMasked() == MotionEvent.ACTION_DOWN) {
            previousFingerPositionX = x;
            previousFingerPositionY = y;
        } else if (ev.getActionMasked() == MotionEvent.ACTION_MOVE) {
            int diffY = y - previousFingerPositionY;
            int diffX = x - previousFingerPositionX;
            if (Math.abs(diffX) + 25 < Math.abs(diffY)) {
                return true;
            }
        }
        return false;
    }
}

@Override
public boolean onTouchEvent(MotionEvent event) {

    int currenty=(int) event.getRawY();
    FrameLayout.LayoutParams layoutParams = (FrameLayout.LayoutParams) card.getLayoutParams();
    switch(event.getAction())
    {

        case MotionEvent.ACTION_DOWN :
            pressedy=currenty;
            viewMariginY=layoutParams.topMargin;
            break;


        case MotionEvent.ACTION_MOVE :
            int diffy=currenty-pressedy;
            int marginy=viewMariginY+diffy;
            layoutParams.topMargin=marginy;
            if(marginy >= max_height && marginy <= min_height)
            {
                ObjectAnimator positionAnimator = ObjectAnimator.ofFloat(card, "y", this.getY(), marginy);
                positionAnimator.setDuration(0);
                positionAnimator.start();
            }
            break;

        case MotionEvent.ACTION_UP :
            int diffy2=currenty-pressedy;
            int marginy2=viewMariginY+diffy2;
            layoutParams.topMargin=marginy2;
            if(marginy2 >= max_height && marginy2 <= min_height)
            {
                ObjectAnimator positionAnimator1 = ObjectAnimator.ofFloat(card, "y", this.getY(), marginy2);
                positionAnimator1.setDuration(0);
                positionAnimator1.start();
            }
            break;
    }

    return true;
}

Answer 1

int pressedx,pressedy;
    int viewMariginX,viewMariginY;  

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

    int currentx=(int) event.getRawX();
    int currenty=(int) event.getRawY();


//get Layout Param of your cardView 

    FrameLayout.LayoutParams layoutParams = (FrameLayout.LayoutParams) v.getLayoutParams();

    switch(event.getAction())
    {

    case MotionEvent.ACTION_DOWN :

        pressedx=currentx;
        pressedy=currenty;

        viewMariginX=layoutParams.leftMargin;
        viewMariginY=layoutParams.topMargin;
        break;


    case MotionEvent.ACTION_MOVE : 

        int diffx=currentx-pressedx;
        int diffy=currenty-pressedy;

        int marginx=viewMariginX+diffx;
        int marginy=viewMariginY+diffy;


        layoutParams.leftMargin=marginx;
        layoutParams.topMargin=marginy;     
        v.setLayoutParams(layoutParams);          
        break;

    case MotionEvent.ACTION_UP : 

        int diffx2=currentx-pressedx;
        int diffy2=currenty-pressedy;

        int marginx2=viewMariginX+diffx2;
        int marginy2=viewMariginY+diffy2;


        layoutParams.leftMargin=marginx2;
        layoutParams.topMargin=marginy2;            
        v.setLayoutParams(layoutParams);    
        break;
    }

    return true;
}

您的引用资料与我几天前所做的类似。

它获取两个位置的差异并将它们从左侧和顶部添加到当前 View 边距。

您可以通过保存这些边距值来保留 View 的位置。

注意:您必须注意您的最大和最小范围

希望对你有帮助...

更新:1)根据需要将 onTouchListners 附加到您的卡片 View 上

cardview.setOnTouchListener(this);cardview1.setOnTouchListener(this);

OnTouch(View v, MotionEvent 事件)当触摸事件被分派(dispatch)到 View 时调用。这使得听众有机会在目标 View 之前做出响应。

指定者:OnTouchListener 中的 onTouch(...)参数:v :触摸事件已分派(dispatch)到的 View 。event :包含有关事件的完整信息的 MotionEvent 对象。通过文档。

将 onTouch 中的卡片 View 更改为 v

根据你的问题

FrameLayout.LayoutParamslayoutParams = (FrameLayout.LayoutParams) v.getLayoutParams();

ObjectAnimatorpositionAnimator = ObjectAnimator.ofFloat(v, "y", this.getY(), marginy); positionAnimator.setDuration(0); positionAnimator.start();

以相同的方法更改更多引用。

2)设置边界的问题是在更改位置之前进行简单的条件检查。

很抱歉解释不好。