向下滑动时,SwipeRefreshLayout禁用拖动动画

Question

是否可以SwipeRefreshLayout在没有类自定义的情况下在向下滑动时禁用拖动动画？

Answer 1

试着打电话:

setEnabled(false)

在您的SwipeRefreshLayout视图上.

Answer 2

好吧,禁用SwipeLayoutAnimanion似乎是一个相当简单的任务,但它涉及android.support.v4.widget.SwipeRefreshLayout在一个项目中复制类.

源代码潜水将揭示,它SwipeRefreshLayout由三个类组成:

• android.support.v4.widget.SwipeRefreshLayout
• android.support.v4.widget.SwipeProgressBar
• android.support.v4.widget.BakedBezierInterpolator

这三个类都应该包含在项目中.然后SwipeRefreshLayout可以定制如下:

添加一个新的公共方法,它将控制布局是否应遵循向下滑动手势:

private boolean mLayoutMovementEnabled = true;

public void setLayoutMovementEnabled(boolean enabled) {
    mLayoutMovementEnabled = enabled;
}

所有相关的计算都在里面进行onTouchEvent().要在移动后禁用布局,

updateContentOffsetTop((int) (offsetTop)); 字符串应更改为

if (mLayoutMovementEnabled) updateContentOffsetTop((int) (offsetTop));

完整的修改例程如下.

@Override
public boolean onTouchEvent(MotionEvent event) {
    final int action = event.getAction();
    boolean handled = false;
    switch (action) {
        case MotionEvent.ACTION_DOWN:
            mCurrPercentage = 0;
            mDownEvent = MotionEvent.obtain(event);
            mPrevY = mDownEvent.getY();
            break;
        case MotionEvent.ACTION_MOVE:
            if (mDownEvent != null && !mReturningToStart) {
                final float eventY = event.getY();
                float yDiff = eventY - mDownEvent.getY();
                if (yDiff > mTouchSlop) {
                    // User velocity passed min velocity; trigger a refresh
                    if (yDiff > mDistanceToTriggerSync) {
                        // User movement passed distance; trigger a refresh
                        startRefresh();
                        handled = true;
                        break;
                    } else {
                        // Just track the user's movement
                        setTriggerPercentage(
                                mAccelerateInterpolator.getInterpolation(
                                        yDiff / mDistanceToTriggerSync));
                        float offsetTop = yDiff;
                        if (mPrevY > eventY) {
                            offsetTop = yDiff - mTouchSlop;
                        }
                        if (mLayoutMovementEnabled) updateContentOffsetTop((int) (offsetTop));
                        if (mPrevY > eventY && (mTarget.getTop() < mTouchSlop)) {
                            // If the user puts the view back at the top, we
                            // don't need to. This shouldn't be considered
                            // cancelling the gesture as the user can restart from the top.
                            removeCallbacks(mCancel);
                        } else {
                            updatePositionTimeout();
                        }
                        mPrevY = event.getY();
                        handled = true;
                    }
                }
            }
            break;
        case MotionEvent.ACTION_UP:
        case MotionEvent.ACTION_CANCEL:
            if (mDownEvent != null) {
                mDownEvent.recycle();
                mDownEvent = null;
            }
            break;
    }
    return handled;
}

Answer 3

禁用滑动的一种简单方法是将触发同步的距离设置为某个值太高而无法达到.

mSwipeLayout.setDistanceToTriggerSync(999999);