Question

我在我的应用程序中实现了新的SwipeRefreshLayout组件，它适用于任何垂直视图，例如ListView，GridView和ScrollView。

水平视图表现得非常糟糕，例如HorizontalScrollView。当向右或向左滚动时，SwipeRefreshLayout视图会缓存触摸，阻止HorizontalScrollView接收它并开始垂直滚动以执行刷新。

我尝试解决此问题，因为我之前使用ScrollView使用ViewPager来解决垂直requestDisallowInterceptTouchEvent的问题，但它无效。我还注意到，在原始SwipeRefreshLayout类中重写此方法而不返回super。谷歌的开发者留下了评论，而不是“//Nope.”：）

因为SwipeRefreshLayout组件相对较新，我找不到修复水平滚动问题的解决方案，同时仍允许滑动刷新视图以跟踪和处理垂直滚动，所以我想我会分享我的解决方案希望它会让一个人花一两个小时。

Answer 1

我通过扩展SwipeRefreshLayout并覆盖其onInterceptTouchEvent来解决它。在里面，我计算用户徘徊的X距离是否大于触摸坡度。如果是，则表示用户正在水平滑动，因此我返回false，让孩子查看（在这种情况下为HorizontalScrollView）以获取触摸事件。


public class CustomSwipeToRefresh extends SwipeRefreshLayout {

    private int mTouchSlop;
    private float mPrevX;

    public CustomSwipeToRefresh(Context context, AttributeSet attrs) {
        super(context, attrs);

        mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent event) {

        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                mPrevX = MotionEvent.obtain(event).getX();
                break;

            case MotionEvent.ACTION_MOVE:
                final float eventX = event.getX();
                float xDiff = Math.abs(eventX - mPrevX);

                if (xDiff > mTouchSlop) {
                    return false;
                }
        }

        return super.onInterceptTouchEvent(event);
    }
}

Answer 2

如果您没有记住已经拒绝了ACTION_MOVE事件的事实，那么如果用户回到您的初始mPrevX附近，您最终会在以后接受该事件。

只需添加一个布尔值来记住它。

public class CustomSwipeToRefresh extends SwipeRefreshLayout {

    private int mTouchSlop;
    private float mPrevX;
    // Indicate if we've already declined the move event
    private boolean mDeclined;

    public CustomSwipeToRefresh(Context context, AttributeSet attrs) {
        super(context, attrs);

        mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent event) {

        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                mPrevX = MotionEvent.obtain(event).getX();
                mDeclined = false; // New action
                break;

            case MotionEvent.ACTION_MOVE:
                final float eventX = event.getX();
                float xDiff = Math.abs(eventX - mPrevX);

                if (mDeclined || xDiff > mTouchSlop) {
                    mDeclined = true; // Memorize
                    return false;
                }
        }

        return super.onInterceptTouchEvent(event);
    }
}

Answer 3

Lior Iluz提出的覆盖onInterceptTouchEvent（）的解决方案存在严重问题。如果内容可滚动容器未完全向上滚动，则可能无法以相同的向上滚动手势激活刷卡刷新。的确，当您开始滚动内部容器并无意间水平移动手指而不是 mTouchSlop 时（默认为8dp），建议的CustomSwipeToRefresh拒绝此手势。因此，用户必须再次尝试开始刷新。对于用户来说，这可能看起来很奇怪。

我从支持库中提取了原始SwipeRefreshLayout的源代码到我的项目中，并重新编写了onInterceptTouchEvent（）。新的类名称为 TouchSafeSwipeRefreshLayout

private boolean mPendingActionDown;
private float mInitialDownY;
private float mInitialDownX;
private boolean mGestureDeclined;

@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
    ensureTarget();
    final int action = ev.getActionMasked();
    int pointerIndex;

    if (mReturningToStart && action == MotionEvent.ACTION_DOWN) {
        mReturningToStart = false;
    }

    if (!isEnabled() || mReturningToStart || mRefreshing ) {
        // Fail fast if we're not in a state where a swipe is possible
        if (D) Log.e(LOG_TAG, "Fail because of not enabled OR refreshing OR returning to start. "+motionEventToShortText(ev));
        return false;
    }

    switch (action) {
        case MotionEvent.ACTION_DOWN:
            setTargetOffsetTopAndBottom(mOriginalOffsetTop - mCircleView.getTop());
            mActivePointerId = ev.getPointerId(0);

            if ((pointerIndex = ev.findPointerIndex(mActivePointerId)) >= 0) {

                if (mNestedScrollInProgress || canChildScrollUp()) {
                    if (D) Log.e(LOG_TAG, "Fail because of nested content is Scrolling. Set pending DOWN=true. "+motionEventToShortText(ev));
                    mPendingActionDown = true;
                } else {
                    mInitialDownX = ev.getX(pointerIndex);
                    mInitialDownY = ev.getY(pointerIndex);
                }
            }
            return false;

        case MotionEvent.ACTION_MOVE:
            if (mActivePointerId == INVALID_POINTER) {
                if (D) Log.e(LOG_TAG, "Got ACTION_MOVE event but don't have an active pointer id.");
                return false;
            } else if (mGestureDeclined) {
                if (D) Log.e(LOG_TAG, "Gesture was declined previously because of horizontal swipe");
                return false;
            } else if ((pointerIndex = ev.findPointerIndex(mActivePointerId)) < 0) {
                return false;
            } else if (mNestedScrollInProgress || canChildScrollUp()) {
                if (D) Log.e(LOG_TAG, "Fail because of nested content is Scrolling. "+motionEventToShortText(ev));
                return false;
            } else if (mPendingActionDown) {
                // This is the 1-st Move after content stops scrolling.
                // Consider this Move as Down (a start of new gesture)
                if (D) Log.e(LOG_TAG, "Consider this move as down - setup initial X/Y."+motionEventToShortText(ev));
                mPendingActionDown = false;
                mInitialDownX = ev.getX(pointerIndex);
                mInitialDownY = ev.getY(pointerIndex);
                return false;
            } else if (Math.abs(ev.getX(pointerIndex) - mInitialDownX) > mTouchSlop) {
                mGestureDeclined = true;
                if (D) Log.e(LOG_TAG, "Decline gesture because of horizontal swipe");
                return false;
            }

            final float y = ev.getY(pointerIndex);
            startDragging(y);
            if (!mIsBeingDragged) {
                if (D) Log.d(LOG_TAG, "Waiting for dY to start dragging. "+motionEventToShortText(ev));
            } else {
                if (D) Log.d(LOG_TAG, "Dragging started! "+motionEventToShortText(ev));
            }
            break;

        case MotionEvent.ACTION_POINTER_UP:
            onSecondaryPointerUp(ev);
            break;

        case MotionEvent.ACTION_UP:
        case MotionEvent.ACTION_CANCEL:
            mIsBeingDragged = false;
            mGestureDeclined = false;
            mPendingActionDown = false;
            mActivePointerId = INVALID_POINTER;
            break;
    }

    return mIsBeingDragged;
}

在Github上查看我的示例项目。

Answer 4

如果您使用Tim Roes EnhancedListView

见issues。我对我非常有用，因为它们添加了一个功能，可以检测滑动开始时和滑动完成时的效果。

当滑动开始时，我禁用SwipeRefreshLayout，当滑动完成时，我可以使用swipeRefreshLayout。

Answer 5

这是我所做的：

class HorizontalScrollViewWithDragListener
    @JvmOverloads constructor(context: Context, attrs: AttributeSet? = null) : HorizontalScrollView(context, attrs) {
    var draggingState: Boolean = false
        set(value) {
            if (field != value) {
                field = value
                listener?.invoke(value)
            }
        }

    var listener: ((draggingState: Boolean) -> Unit)? = null

    override fun onInterceptTouchEvent(ev: MotionEvent) =
        super.onInterceptTouchEvent(ev)
            .also { draggingState = it }


    @SuppressLint("ClickableViewAccessibility")
    override fun onTouchEvent(ev: MotionEvent) =
        super.onTouchEvent(ev)
            .also {
                if(ev.action == MotionEvent.ACTION_UP) {
                    draggingState = false
                }
            }
}

然后我只需在设置代码中执行此操作：

   myScrollView.listener = { refreshView.isEnabled = !it }

SwipeRefreshLayout中的HorizontalScrollView

5 个答案:

SwipeRefreshLayout中的Horizo​​ntalScrollView

5 个答案:

SwipeRefreshLayout中的HorizontalScrollView