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@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
    switch (ev.getActionMasked()) {
        case MotionEvent.ACTION_DOWN:
            mInitX = ev.getX();
            mInitY = ev.getY();
            super.dispatchTouchEvent(ev);
            return true;
        case MotionEvent.ACTION_MOVE:
            //>0为手势向右下
            float mOffsetX = ev.getX() - mInitX;
            float mOffsetY = ev.getY() - mInitY;

            //横向手势跟随移动
            if (isDragging) {
                requestDisallowInterceptTouchEvent(true);
                int offset = (int) -mOffsetX;
                if (getScrollX() + offset > mRightView.getWidth() || getScrollX() + offset < 0) {
                    return true;
                }
                this.scrollBy(offset, 0);
                mInitX = ev.getX();
                mInitY = ev.getY();
            } else if (Math.abs(mOffsetX) - Math.abs(mOffsetY) > ViewConfiguration.getTouchSlop()) {
                isDragging = true;
            }
            break;
        case MotionEvent.ACTION_CANCEL:
        case MotionEvent.ACTION_UP:
            //松手时刻滑动
            int offset = ((getScrollX() / (float) mRightView.getWidth()) > 0.5) ? mRightView.getWidth() : 0;
            mScroller.startScroll(this.getScrollX(), this.getScrollY(), offset - this.getScrollX(), 0);
            invalidate();
            mInitX = 0;
            mInitY = 0;
            isDragging = false;
            break;
    }
    return super.dispatchTouchEvent(ev);
}