Example usage for android.view VelocityTracker obtain

Introduction

In this page you can find the example usage for android.view VelocityTracker obtain.

Prototype

static public VelocityTracker obtain() 

Source Link

Document

Retrieve a new VelocityTracker object to watch the velocity of a motion.

Usage

From source file:com.av.remusic.widget.RoundViewPager.java

@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
    /*/*from ww w.  j a v a 2  s .c  om*/
     * This method JUST determines whether we want to intercept the motion.
     * If we return true, onMotionEvent will be called and we do the actual
     * scrolling there.
     */

    final int action = ev.getAction() & MotionEventCompat.ACTION_MASK;

    // Always take care of the touch gesture being complete.
    if (action == MotionEvent.ACTION_CANCEL || action == MotionEvent.ACTION_UP) {
        // Release the drag.
        if (DEBUG)
            Log.v(TAG, "Intercept done!");
        resetTouch();
        return false;
    }

    // Nothing more to do here if we have decided whether or not we
    // are dragging.
    if (action != MotionEvent.ACTION_DOWN) {
        if (mIsBeingDragged) {
            if (DEBUG)
                Log.v(TAG, "Intercept returning true!");
            return true;
        }
        if (mIsUnableToDrag) {
            if (DEBUG)
                Log.v(TAG, "Intercept returning false!");
            return false;
        }
    }

    switch (action) {
    case MotionEvent.ACTION_MOVE: {
        /*
         * mIsBeingDragged == false, otherwise the shortcut would have caught it. Check
         * whether the user has moved far enough from his original down touch.
         */

        /*
        * Locally do absolute value. mLastMotionY is set to the y value
        * of the down event.
        */
        final int activePointerId = mActivePointerId;
        if (activePointerId == INVALID_POINTER) {
            // If we don't have a valid id, the touch down wasn't on content.
            break;
        }

        final int pointerIndex = MotionEventCompat.findPointerIndex(ev, activePointerId);
        final float x = MotionEventCompat.getX(ev, pointerIndex);
        final float dx = x - mLastMotionX;
        final float xDiff = Math.abs(dx);
        final float y = MotionEventCompat.getY(ev, pointerIndex);
        final float yDiff = Math.abs(y - mInitialMotionY);
        if (DEBUG)
            Log.v(TAG, "Moved x to " + x + "," + y + " diff=" + xDiff + "," + yDiff);

        if (dx != 0 && !isGutterDrag(mLastMotionX, dx) && canScroll(this, false, (int) dx, (int) x, (int) y)) {
            // Nested view has scrollable area under this point. Let it be handled there.
            mLastMotionX = x;
            mLastMotionY = y;
            mIsUnableToDrag = true;
            return false;
        }
        if (xDiff > mTouchSlop && xDiff * 0.5f > yDiff) {
            if (DEBUG)
                Log.v(TAG, "Starting drag!");
            mIsBeingDragged = true;
            requestParentDisallowInterceptTouchEvent(true);
            setScrollState(SCROLL_STATE_DRAGGING);
            mLastMotionX = dx > 0 ? mInitialMotionX + mTouchSlop : mInitialMotionX - mTouchSlop;
            mLastMotionY = y;
            setScrollingCacheEnabled(true);
        } else if (yDiff > mTouchSlop) {
            // The finger has moved enough in the vertical
            // direction to be counted as a drag...  abort
            // any attempt to drag horizontally, to work correctly
            // with children that have scrolling containers.
            if (DEBUG)
                Log.v(TAG, "Starting unable to drag!");
            mIsUnableToDrag = true;
        }
        if (mIsBeingDragged) {
            // Scroll to follow the motion event
            if (performDrag(x)) {
                ViewCompat.postInvalidateOnAnimation(this);
            }
        }
        break;
    }

    case MotionEvent.ACTION_DOWN: {
        /*
         * Remember location of down touch.
         * ACTION_DOWN always refers to pointer index 0.
         */
        mLastMotionX = mInitialMotionX = ev.getX();
        mLastMotionY = mInitialMotionY = ev.getY();
        mActivePointerId = MotionEventCompat.getPointerId(ev, 0);
        mIsUnableToDrag = false;

        mIsScrollStarted = true;
        mScroller.computeScrollOffset();
        if (mScrollState == SCROLL_STATE_SETTLING
                && Math.abs(mScroller.getFinalX() - mScroller.getCurrX()) > mCloseEnough) {
            // Let the user 'catch' the pager as it animates.
            mScroller.abortAnimation();
            mPopulatePending = false;
            populate();
            mIsBeingDragged = true;
            requestParentDisallowInterceptTouchEvent(true);
            setScrollState(SCROLL_STATE_DRAGGING);
        } else {
            completeScroll(false);
            mIsBeingDragged = false;
        }

        if (DEBUG)
            Log.v(TAG, "Down at " + mLastMotionX + "," + mLastMotionY + " mIsBeingDragged=" + mIsBeingDragged
                    + "mIsUnableToDrag=" + mIsUnableToDrag);
        break;
    }

    case MotionEventCompat.ACTION_POINTER_UP:
        onSecondaryPointerUp(ev);
        break;
    }

    if (mVelocityTracker == null) {
        mVelocityTracker = VelocityTracker.obtain();
    }
    mVelocityTracker.addMovement(ev);

    /*
     * The only time we want to intercept motion events is if we are in the
     * drag mode.
     */
    return mIsBeingDragged;
}

---

From source file:example.luojing.androidsourceanalysis.ViewPager.java

/**
 * //from ww  w . jav  a2  s.co m
 */
@Override
public boolean onTouchEvent(MotionEvent ev) {
    if (mFakeDragging) {
        // A fake drag is in progress already, ignore this real one
        // but still eat the touch events.
        // (It is likely that the user is multi-touching the screen.)
        return true;
    }

    if (ev.getAction() == MotionEvent.ACTION_DOWN && ev.getEdgeFlags() != 0) {
        // Don't handle edge touches immediately -- they may actually belong to one of our
        // descendants.
        return false;
    }

    if (mAdapter == null || mAdapter.getCount() == 0) {
        // Nothing to present or scroll; nothing to touch.
        return false;
    }

    if (mVelocityTracker == null) {
        mVelocityTracker = VelocityTracker.obtain();
    }
    mVelocityTracker.addMovement(ev);

    final int action = ev.getAction();
    boolean needsInvalidate = false;

    switch (action & MotionEventCompat.ACTION_MASK) {
    case MotionEvent.ACTION_DOWN: {
        mScroller.abortAnimation();
        mPopulatePending = false;
        populate();

        // Remember where the motion event started
        mLastMotionX = mInitialMotionX = ev.getX();
        mLastMotionY = mInitialMotionY = ev.getY();
        mActivePointerId = ev.getPointerId(0);
        break;
    }
    case MotionEvent.ACTION_MOVE:
        if (!mIsBeingDragged) {
            final int pointerIndex = ev.findPointerIndex(mActivePointerId);
            if (pointerIndex == -1) {
                // A child has consumed some touch events and put us into an inconsistent
                // state.
                needsInvalidate = resetTouch();
                break;
            }
            final float x = ev.getX(pointerIndex);
            final float xDiff = Math.abs(x - mLastMotionX);
            final float y = ev.getY(pointerIndex);
            final float yDiff = Math.abs(y - mLastMotionY);
            if (DEBUG) {
                Log.v(TAG, "Moved x to " + x + "," + y + " diff=" + xDiff + "," + yDiff);
            }
            if (xDiff > mTouchSlop && xDiff > yDiff) {
                if (DEBUG)
                    Log.v(TAG, "Starting drag!");
                mIsBeingDragged = true;
                requestParentDisallowInterceptTouchEvent(true);
                mLastMotionX = x - mInitialMotionX > 0 ? mInitialMotionX + mTouchSlop
                        : mInitialMotionX - mTouchSlop;
                mLastMotionY = y;
                setScrollState(SCROLL_STATE_DRAGGING);
                setScrollingCacheEnabled(true);

                // Disallow Parent Intercept, just in case
                ViewParent parent = getParent();
                if (parent != null) {
                    parent.requestDisallowInterceptTouchEvent(true);
                }
            }
        }
        // Not else! Note that mIsBeingDragged can be set above.
        if (mIsBeingDragged) {
            // Scroll to follow the motion event
            final int activePointerIndex = ev.findPointerIndex(mActivePointerId);
            final float x = ev.getX(activePointerIndex);
            needsInvalidate |= performDrag(x);
        }
        break;
    case MotionEvent.ACTION_UP:
        if (mIsBeingDragged) {
            final VelocityTracker velocityTracker = mVelocityTracker;
            velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
            int initialVelocity = (int) VelocityTrackerCompat.getXVelocity(velocityTracker, mActivePointerId);
            mPopulatePending = true;
            final int width = getClientWidth();
            final int scrollX = getScrollX();
            final ItemInfo ii = infoForCurrentScrollPosition();
            final float marginOffset = (float) mPageMargin / width;
            final int currentPage = ii.position;
            final float pageOffset = (((float) scrollX / width) - ii.offset) / (ii.widthFactor + marginOffset);
            final int activePointerIndex = ev.findPointerIndex(mActivePointerId);
            final float x = ev.getX(activePointerIndex);
            final int totalDelta = (int) (x - mInitialMotionX);
            int nextPage = determineTargetPage(currentPage, pageOffset, initialVelocity, totalDelta);
            setCurrentItemInternal(nextPage, true, true, initialVelocity);

            needsInvalidate = resetTouch();
        }
        break;
    case MotionEvent.ACTION_CANCEL:
        if (mIsBeingDragged) {
            scrollToItem(mCurItem, true, 0, false);
            needsInvalidate = resetTouch();
        }
        break;
    case MotionEventCompat.ACTION_POINTER_DOWN: {
        final int index = MotionEventCompat.getActionIndex(ev);
        final float x = ev.getX(index);
        mLastMotionX = x;
        mActivePointerId = ev.getPointerId(index);
        break;
    }
    case MotionEventCompat.ACTION_POINTER_UP:
        onSecondaryPointerUp(ev);
        mLastMotionX = ev.getX(ev.findPointerIndex(mActivePointerId));
        break;
    }
    if (needsInvalidate) {
        ViewCompat.postInvalidateOnAnimation(this);
    }
    return true;
}

---

From source file:cn.androidy.materialdesignsample.ryanharterviewpager.ViewPager.java

@Override
public boolean onTouchEvent(MotionEvent ev) {
    if (mFakeDragging) {
        // A fake drag is in progress already, ignore this real one
        // but still eat the touch events.
        // (It is likely that the user is multi-touching the screen.)
        return true;
    }//from  ww  w.j  a v  a 2  s. com

    if (ev.getAction() == MotionEvent.ACTION_DOWN && ev.getEdgeFlags() != 0) {
        // Don't handle edge touches immediately -- they may actually belong to one of our
        // descendants.
        return false;
    }

    if (mAdapter == null || mAdapter.getCount() == 0) {
        // Nothing to present or scroll; nothing to touch.
        return false;
    }

    if (mVelocityTracker == null) {
        mVelocityTracker = VelocityTracker.obtain();
    }
    mVelocityTracker.addMovement(ev);

    final int action = ev.getAction();
    boolean needsInvalidate = false;

    switch (action & MotionEventCompat.ACTION_MASK) {
    case MotionEvent.ACTION_DOWN: {
        mScroller.abortAnimation();
        mPopulatePending = false;
        populate();
        mIsBeingDragged = true;
        setScrollState(SCROLL_STATE_DRAGGING);

        // Remember where the motion event started
        mLastMotionX = mInitialMotionX = ev.getX();
        mLastMotionY = mInitialMotionY = ev.getY();
        mActivePointerId = MotionEventCompat.getPointerId(ev, 0);
        break;
    }
    case MotionEvent.ACTION_MOVE:
        if (!mIsBeingDragged) {
            final int pointerIndex = MotionEventCompat.findPointerIndex(ev, mActivePointerId);
            final float x = MotionEventCompat.getX(ev, pointerIndex);
            final float xDiff = Math.abs(x - mLastMotionX);
            final float y = MotionEventCompat.getY(ev, pointerIndex);
            final float yDiff = Math.abs(y - mLastMotionY);
            if (DEBUG)
                Log.v(TAG, "Moved x to " + x + "," + y + " diff=" + xDiff + "," + yDiff);
            if (isOrientationHorizontal()) {
                if (xDiff > mTouchSlop && xDiff > yDiff) {
                    if (DEBUG)
                        Log.v(TAG, "Starting drag!");
                    mIsBeingDragged = true;
                    mLastMotionX = x - mInitialMotionX > 0 ? mInitialMotionX + mTouchSlop
                            : mInitialMotionX - mTouchSlop;
                    mLastMotionY = y;
                    setScrollState(SCROLL_STATE_DRAGGING);
                    setScrollingCacheEnabled(true);
                }
            } else {
                if (yDiff > mTouchSlop && yDiff > xDiff) {
                    if (DEBUG)
                        Log.v(TAG, "Starting drag!");
                    mIsBeingDragged = true;
                    mLastMotionY = y - mInitialMotionY > 0 ? mInitialMotionY + mTouchSlop
                            : mInitialMotionY - mTouchSlop;
                    mLastMotionX = x;
                    setScrollState(SCROLL_STATE_DRAGGING);
                    setScrollingCacheEnabled(true);
                }
            }
        }
        // Not else! Note that mIsBeingDragged can be set above.
        if (mIsBeingDragged) {
            // Scroll to follow the motion event
            final int activePointerIndex = MotionEventCompat.findPointerIndex(ev, mActivePointerId);
            float x = 0;
            if (isOrientationHorizontal()) {
                x = MotionEventCompat.getX(ev, activePointerIndex);
            } else {
                x = MotionEventCompat.getY(ev, activePointerIndex);
            }
            needsInvalidate |= performDrag(x);
        }
        break;
    case MotionEvent.ACTION_UP:
        if (mIsBeingDragged) {
            final VelocityTracker velocityTracker = mVelocityTracker;
            velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
            mPopulatePending = true;
            final ItemInfo ii = infoForCurrentScrollPosition();
            final int currentPage = ii.position;

            int initialVelocity, totalDelta;
            float pageOffset;
            if (isOrientationHorizontal()) {
                initialVelocity = (int) VelocityTrackerCompat.getXVelocity(velocityTracker, mActivePointerId);
                final int width = getClientWidth();
                final int scrollX = getScrollX();
                pageOffset = (((float) scrollX / width) - ii.offset) / ii.sizeFactor;
                final int activePointerIndex = MotionEventCompat.findPointerIndex(ev, mActivePointerId);
                final float x = MotionEventCompat.getX(ev, activePointerIndex);
                totalDelta = (int) (x - mInitialMotionX);
            } else {
                initialVelocity = (int) VelocityTrackerCompat.getYVelocity(velocityTracker, mActivePointerId);
                final int height = getClientHeight();
                final int scrollY = getScrollY();
                pageOffset = (((float) scrollY / height) - ii.offset) / ii.sizeFactor;
                final int activePointerIndex = MotionEventCompat.findPointerIndex(ev, mActivePointerId);
                final float y = MotionEventCompat.getY(ev, activePointerIndex);
                totalDelta = (int) (y - mInitialMotionY);
            }

            int nextPage = determineTargetPage(currentPage, pageOffset, initialVelocity, totalDelta);
            setCurrentItemInternal(nextPage, true, true, initialVelocity);

            mActivePointerId = INVALID_POINTER;
            endDrag();
            needsInvalidate = mLeftEdge.onRelease() | mRightEdge.onRelease();
        }
        break;
    case MotionEvent.ACTION_CANCEL:
        if (mIsBeingDragged) {
            scrollToItem(mCurItem, true, 0, false);
            mActivePointerId = INVALID_POINTER;
            endDrag();
            needsInvalidate = mLeftEdge.onRelease() | mRightEdge.onRelease();
        }
        break;
    case MotionEventCompat.ACTION_POINTER_DOWN: {
        final int index = MotionEventCompat.getActionIndex(ev);
        final float x = MotionEventCompat.getX(ev, index);
        final float y = MotionEventCompat.getY(ev, index);
        mLastMotionX = x;
        mLastMotionY = y;
        mActivePointerId = MotionEventCompat.getPointerId(ev, index);
        break;
    }
    case MotionEventCompat.ACTION_POINTER_UP:
        onSecondaryPointerUp(ev);
        mLastMotionX = MotionEventCompat.getX(ev, MotionEventCompat.findPointerIndex(ev, mActivePointerId));
        mLastMotionY = MotionEventCompat.getY(ev, MotionEventCompat.findPointerIndex(ev, mActivePointerId));
        break;
    }
    if (needsInvalidate) {
        ViewCompat.postInvalidateOnAnimation(this);
    }
    return true;
}

---

From source file:com.guide.ViewPager.java

@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
    /*//from   w  ww. j  a va  2 s.  c  om
     * This method JUST determines whether we want to intercept the motion.
     * If we return true, onMotionEvent will be called and we do the actual
     * scrolling there.
     */

    final int action = ev.getAction() & MotionEventCompat.ACTION_MASK;

    // Always take care of the touch gesture being complete.
    if (action == MotionEvent.ACTION_CANCEL || action == MotionEvent.ACTION_UP) {
        // Release the drag.
        if (DEBUG)
            Log.v(TAG, "Intercept done!");
        mIsBeingDragged = false;
        mIsUnableToDrag = false;
        mActivePointerId = INVALID_POINTER;
        if (mVelocityTracker != null) {
            mVelocityTracker.recycle();
            mVelocityTracker = null;
        }
        return false;
    }

    // Nothing more to do here if we have decided whether or not we
    // are dragging.
    if (action != MotionEvent.ACTION_DOWN) {
        if (mIsBeingDragged) {
            if (DEBUG)
                Log.v(TAG, "Intercept returning true!");
            return true;
        }
        if (mIsUnableToDrag) {
            if (DEBUG)
                Log.v(TAG, "Intercept returning false!");
            return false;
        }
    }

    switch (action) {
    case MotionEvent.ACTION_MOVE: {
        /*
         * mIsBeingDragged == false, otherwise the shortcut would have
         * caught it. Check whether the user has moved far enough from his
         * original down touch.
         */

        /*
         * Locally do absolute value. mLastMotionY is set to the y value of
         * the down event.
         */
        final int activePointerId = mActivePointerId;
        if (activePointerId == INVALID_POINTER) {
            // If we don't have a valid id, the touch down wasn't on
            // content.
            break;
        }

        final int pointerIndex = MotionEventCompat.findPointerIndex(ev, activePointerId);
        final float x = MotionEventCompat.getX(ev, pointerIndex);
        final float dx = x - mLastMotionX;
        final float xDiff = Math.abs(dx);
        final float y = MotionEventCompat.getY(ev, pointerIndex);
        final float dy = y - mLastMotionY;
        final float yDiff = Math.abs(y - mInitialMotionY);
        if (DEBUG)
            Log.v(TAG, "Moved x to " + x + "," + y + " diff=" + xDiff + "," + yDiff);

        if (isOrientationHorizontal()) {
            if (dx != 0 && !isGutterDrag(mLastMotionX, dx)
                    && canScroll(this, false, (int) dx, (int) x, (int) y)) {
                // Nested view has scrollable area under this point. Let it
                // be handled there.
                mLastMotionX = x;
                mLastMotionY = y;
                mIsUnableToDrag = true;
                return false;
            }
            if (xDiff > mTouchSlop && xDiff * 0.5f > yDiff) {
                if (DEBUG)
                    Log.v(TAG, "Starting drag!");
                mIsBeingDragged = true;
                setScrollState(SCROLL_STATE_DRAGGING);
                mLastMotionX = dx > 0 ? mInitialMotionX + mTouchSlop : mInitialMotionX - mTouchSlop;
                mLastMotionY = y;
                setScrollingCacheEnabled(true);
            } else if (yDiff > mTouchSlop) {
                // The finger has moved enough in the vertical
                // direction to be counted as a drag... abort
                // any attempt to drag horizontally, to work correctly
                // with children that have scrolling containers.
                if (DEBUG)
                    Log.v(TAG, "Starting unable to drag!");
                mIsUnableToDrag = true;
            }
            if (mIsBeingDragged) {
                // Scroll to follow the motion event
                if (performDrag(x)) {
                    ViewCompat.postInvalidateOnAnimation(this);
                }
            }
        } else {
            if (dy != 0 && !isGutterDrag(mLastMotionY, dy)
                    && canScroll(this, false, (int) dx, (int) x, (int) y)) {
                // Nested view has scrollable area under this point. Let it
                // be handled there.
                mLastMotionX = x;
                mLastMotionY = y;
                mIsUnableToDrag = true;
                return false;
            }
            if (yDiff > mTouchSlop && yDiff * 0.5f > xDiff) {
                if (DEBUG)
                    Log.v(TAG, "Starting drag!");
                mIsBeingDragged = true;
                setScrollState(SCROLL_STATE_DRAGGING);
                mLastMotionY = dy > 0 ? mInitialMotionY + mTouchSlop : mInitialMotionY - mTouchSlop;
                mLastMotionX = x;
                setScrollingCacheEnabled(true);
            } else if (xDiff > mTouchSlop) {
                // The finger has moved enough in the vertical
                // direction to be counted as a drag... abort
                // any attempt to drag horizontally, to work correctly
                // with children that have scrolling containers.
                if (DEBUG)
                    Log.v(TAG, "Starting unable to drag!");
                mIsUnableToDrag = true;
            }
            if (mIsBeingDragged) {
                // Scroll to follow the motion event
                if (performDrag(y)) {
                    ViewCompat.postInvalidateOnAnimation(this);
                }
            }
        }
        break;
    }

    case MotionEvent.ACTION_DOWN: {
        /*
         * Remember location of down touch. ACTION_DOWN always refers to
         * pointer index 0.
         */
        mLastMotionX = mInitialMotionX = ev.getX();
        mLastMotionY = mInitialMotionY = ev.getY();
        mActivePointerId = MotionEventCompat.getPointerId(ev, 0);
        mIsUnableToDrag = false;

        mScroller.computeScrollOffset();
        int distance = 0;
        if (isOrientationHorizontal()) {
            distance = Math.abs(mScroller.getFinalX() - mScroller.getCurrX());
        } else {
            distance = Math.abs(mScroller.getFinalY() - mScroller.getCurrY());
        }
        if (mScrollState == SCROLL_STATE_SETTLING && distance > mCloseEnough) {
            // Let the user 'catch' the pager as it animates.
            mScroller.abortAnimation();
            mPopulatePending = false;
            populate();
            mIsBeingDragged = true;
            setScrollState(SCROLL_STATE_DRAGGING);
        } else {
            completeScroll(false);
            mIsBeingDragged = false;
        }

        if (DEBUG)
            Log.v(TAG, "Down at " + mLastMotionX + "," + mLastMotionY + " mIsBeingDragged=" + mIsBeingDragged
                    + "mIsUnableToDrag=" + mIsUnableToDrag);
        break;
    }

    case MotionEventCompat.ACTION_POINTER_UP:
        onSecondaryPointerUp(ev);
        break;
    }

    if (mVelocityTracker == null) {
        mVelocityTracker = VelocityTracker.obtain();
    }
    mVelocityTracker.addMovement(ev);

    /*
     * The only time we want to intercept motion events is if we are in the
     * drag mode.
     */
    return mIsBeingDragged;
}

---

From source file:com.av.remusic.widget.RoundViewPager.java

@Override
public boolean onTouchEvent(MotionEvent ev) {

    if (mFakeDragging) {
        // A fake drag is in progress already, ignore this real one
        // but still eat the touch events.
        // (It is likely that the user is multi-touching the screen.)
        return true;
    }/*from   w w  w .j a  va  2 s .  c  om*/

    if (ev.getAction() == MotionEvent.ACTION_DOWN && ev.getEdgeFlags() != 0) {
        // Don't handle edge touches immediately -- they may actually belong to one of our
        // descendants.
        return false;
    }

    if (mAdapter == null || mAdapter.getCount() == 0) {
        // Nothing to present or scroll; nothing to touch.
        return false;
    }

    if (mVelocityTracker == null) {
        mVelocityTracker = VelocityTracker.obtain();
    }
    mVelocityTracker.addMovement(ev);

    final int action = ev.getAction();
    boolean needsInvalidate = false;
    Log.e("round", "onevent");

    switch (action & MotionEventCompat.ACTION_MASK) {

    case MotionEvent.ACTION_DOWN: {
        Log.e("round", "ondown");
        isSingleTouch = true;

        mScroller.abortAnimation();
        mPopulatePending = false;
        populate();

        // Remember where the motion event started
        mLastMotionX = mInitialMotionX = ev.getX();
        mLastMotionY = mInitialMotionY = ev.getY();
        mActivePointerId = MotionEventCompat.getPointerId(ev, 0);
        break;
    }
    case MotionEvent.ACTION_MOVE:
        Log.e("round", "onmove");
        if (!mIsBeingDragged) {
            final int pointerIndex = MotionEventCompat.findPointerIndex(ev, mActivePointerId);
            if (pointerIndex == -1) {
                // A child has consumed some touch events and put us into an inconsistent state.
                needsInvalidate = resetTouch();
                break;
            }
            final float x = MotionEventCompat.getX(ev, pointerIndex);
            final float xDiff = Math.abs(x - mLastMotionX);
            final float y = MotionEventCompat.getY(ev, pointerIndex);
            final float yDiff = Math.abs(y - mLastMotionY);

            if (DEBUG)
                Log.v(TAG, "Moved x to " + x + "," + y + " diff=" + xDiff + "," + yDiff);
            if (xDiff > mTouchSlop && xDiff > yDiff) {
                if (DEBUG)
                    Log.v(TAG, "Starting drag!");

                isSingleTouch = false;
                if (mAnimationChange != null) {
                    mAnimationChange.onPause();
                }

                mIsBeingDragged = true;
                requestParentDisallowInterceptTouchEvent(true);
                mLastMotionX = x - mInitialMotionX > 0 ? mInitialMotionX + mTouchSlop
                        : mInitialMotionX - mTouchSlop;
                mLastMotionY = y;
                setScrollState(SCROLL_STATE_DRAGGING);
                setScrollingCacheEnabled(true);

                // Disallow Parent Intercept, just in case
                ViewParent parent = getParent();
                if (parent != null) {
                    parent.requestDisallowInterceptTouchEvent(true);
                }
            }
        }
        // Not else! Note that mIsBeingDragged can be set above.
        if (mIsBeingDragged) {
            // Scroll to follow the motion event
            final int activePointerIndex = MotionEventCompat.findPointerIndex(ev, mActivePointerId);
            final float x = MotionEventCompat.getX(ev, activePointerIndex);
            needsInvalidate |= performDrag(x);
        }
        break;
    case MotionEvent.ACTION_UP:
        if (mIsBeingDragged) {
            final VelocityTracker velocityTracker = mVelocityTracker;
            velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
            int initialVelocity = (int) VelocityTrackerCompat.getXVelocity(velocityTracker, mActivePointerId);
            mPopulatePending = true;
            final int width = getClientWidth();
            final int scrollX = getScrollX();
            final ItemInfo ii = infoForCurrentScrollPosition();
            final float marginOffset = (float) mPageMargin / width;
            final int currentPage = ii.position;
            final float pageOffset = (((float) scrollX / width) - ii.offset) / (ii.widthFactor + marginOffset);
            final int activePointerIndex = MotionEventCompat.findPointerIndex(ev, mActivePointerId);
            final float x = MotionEventCompat.getX(ev, activePointerIndex);
            final int totalDelta = (int) (x - mInitialMotionX);
            int nextPage = determineTargetPage(currentPage, pageOffset, initialVelocity, totalDelta);
            setCurrentItemInternal(nextPage, true, true, initialVelocity);

            needsInvalidate = resetTouch();
        }
        Log.e("round", "onup" + isSingleTouch);
        //                if(mAnimationChange != null && isSingleTouch){
        //                    mAnimationChange.onReStart();
        //        }
        break;
    case MotionEvent.ACTION_CANCEL:
        if (mIsBeingDragged) {
            scrollToItem(mCurItem, true, 0, false);
            needsInvalidate = resetTouch();
        }
        break;
    case MotionEventCompat.ACTION_POINTER_DOWN: {
        final int index = MotionEventCompat.getActionIndex(ev);
        final float x = MotionEventCompat.getX(ev, index);
        mLastMotionX = x;
        mActivePointerId = MotionEventCompat.getPointerId(ev, index);
        break;
    }
    case MotionEventCompat.ACTION_POINTER_UP:
        onSecondaryPointerUp(ev);
        mLastMotionX = MotionEventCompat.getX(ev, MotionEventCompat.findPointerIndex(ev, mActivePointerId));
        break;
    }
    if (needsInvalidate) {
        ViewCompat.postInvalidateOnAnimation(this);
    }
    return true;
}

---

From source file:com.guide.ViewPager.java

@Override
public boolean onTouchEvent(MotionEvent ev) {
    if (mFakeDragging) {
        // A fake drag is in progress already, ignore this real one
        // but still eat the touch events.
        // (It is likely that the user is multi-touching the screen.)
        return true;
    }//  w ww  . ja  v a2s .c o m

    if (ev.getAction() == MotionEvent.ACTION_DOWN && ev.getEdgeFlags() != 0) {
        // Don't handle edge touches immediately -- they may actually belong
        // to one of our
        // descendants.
        return false;
    }

    if (mAdapter == null || mAdapter.getCount() == 0) {
        // Nothing to present or scroll; nothing to touch.
        return false;
    }

    if (mVelocityTracker == null) {
        mVelocityTracker = VelocityTracker.obtain();
    }
    mVelocityTracker.addMovement(ev);

    final int action = ev.getAction();
    boolean needsInvalidate = false;

    switch (action & MotionEventCompat.ACTION_MASK) {
    case MotionEvent.ACTION_DOWN: {
        mScroller.abortAnimation();
        mPopulatePending = false;
        populate();
        mIsBeingDragged = true;
        setScrollState(SCROLL_STATE_DRAGGING);

        // Remember where the motion event started
        mLastMotionX = mInitialMotionX = ev.getX();
        mLastMotionY = mInitialMotionY = ev.getY();
        mActivePointerId = MotionEventCompat.getPointerId(ev, 0);
        break;
    }
    case MotionEvent.ACTION_MOVE:
        if (!mIsBeingDragged) {
            final int pointerIndex = MotionEventCompat.findPointerIndex(ev, mActivePointerId);
            final float x = MotionEventCompat.getX(ev, pointerIndex);
            final float xDiff = Math.abs(x - mLastMotionX);
            final float y = MotionEventCompat.getY(ev, pointerIndex);
            final float yDiff = Math.abs(y - mLastMotionY);
            if (DEBUG)
                Log.v(TAG, "Moved x to " + x + "," + y + " diff=" + xDiff + "," + yDiff);
            if (isOrientationHorizontal()) {
                if (xDiff > mTouchSlop && xDiff > yDiff) {
                    if (DEBUG)
                        Log.v(TAG, "Starting drag!");
                    mIsBeingDragged = true;
                    mLastMotionX = x - mInitialMotionX > 0 ? mInitialMotionX + mTouchSlop
                            : mInitialMotionX - mTouchSlop;
                    mLastMotionY = y;
                    setScrollState(SCROLL_STATE_DRAGGING);
                    setScrollingCacheEnabled(true);
                }
            } else {
                if (yDiff > mTouchSlop && yDiff > xDiff) {
                    if (DEBUG)
                        Log.v(TAG, "Starting drag!");
                    mIsBeingDragged = true;
                    mLastMotionY = y - mInitialMotionY > 0 ? mInitialMotionY + mTouchSlop
                            : mInitialMotionY - mTouchSlop;
                    mLastMotionX = x;
                    setScrollState(SCROLL_STATE_DRAGGING);
                    setScrollingCacheEnabled(true);
                }
            }
        }
        // Not else! Note that mIsBeingDragged can be set above.
        if (mIsBeingDragged) {
            // Scroll to follow the motion event
            final int activePointerIndex = MotionEventCompat.findPointerIndex(ev, mActivePointerId);
            float x = 0;
            if (isOrientationHorizontal()) {
                x = MotionEventCompat.getX(ev, activePointerIndex);
            } else {
                x = MotionEventCompat.getY(ev, activePointerIndex);
            }
            needsInvalidate |= performDrag(x);
        }
        break;
    case MotionEvent.ACTION_UP:
        if (mIsBeingDragged) {
            final VelocityTracker velocityTracker = mVelocityTracker;
            velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
            mPopulatePending = true;
            final ItemInfo ii = infoForCurrentScrollPosition();
            final int currentPage = ii.position;

            int initialVelocity, totalDelta;
            float pageOffset;
            if (isOrientationHorizontal()) {
                initialVelocity = (int) VelocityTrackerCompat.getXVelocity(velocityTracker, mActivePointerId);
                final int width = getClientWidth();
                final int scrollX = getScrollX();
                pageOffset = (((float) scrollX / width) - ii.offset) / ii.sizeFactor;
                final int activePointerIndex = MotionEventCompat.findPointerIndex(ev, mActivePointerId);
                final float x = MotionEventCompat.getX(ev, activePointerIndex);
                totalDelta = (int) (x - mInitialMotionX);
            } else {
                initialVelocity = (int) VelocityTrackerCompat.getYVelocity(velocityTracker, mActivePointerId);
                final int height = getClientHeight();
                final int scrollY = getScrollY();
                pageOffset = (((float) scrollY / height) - ii.offset) / ii.sizeFactor;
                final int activePointerIndex = MotionEventCompat.findPointerIndex(ev, mActivePointerId);
                final float y = MotionEventCompat.getY(ev, activePointerIndex);
                totalDelta = (int) (y - mInitialMotionY);
            }

            int nextPage = determineTargetPage(currentPage, pageOffset, initialVelocity, totalDelta);
            setCurrentItemInternal(nextPage, true, true, initialVelocity);

            mActivePointerId = INVALID_POINTER;
            endDrag();
            needsInvalidate = mLeftEdge.onRelease() | mRightEdge.onRelease();
        }
        break;
    case MotionEvent.ACTION_CANCEL:
        if (mIsBeingDragged) {
            scrollToItem(mCurItem, true, 0, false);
            mActivePointerId = INVALID_POINTER;
            endDrag();
            needsInvalidate = mLeftEdge.onRelease() | mRightEdge.onRelease();
        }
        break;
    case MotionEventCompat.ACTION_POINTER_DOWN: {
        final int index = MotionEventCompat.getActionIndex(ev);
        final float x = MotionEventCompat.getX(ev, index);
        final float y = MotionEventCompat.getY(ev, index);
        mLastMotionX = x;
        mLastMotionY = y;
        mActivePointerId = MotionEventCompat.getPointerId(ev, index);
        break;
    }
    case MotionEventCompat.ACTION_POINTER_UP:
        onSecondaryPointerUp(ev);
        mLastMotionX = MotionEventCompat.getX(ev, MotionEventCompat.findPointerIndex(ev, mActivePointerId));
        mLastMotionY = MotionEventCompat.getY(ev, MotionEventCompat.findPointerIndex(ev, mActivePointerId));
        break;
    }
    if (needsInvalidate) {
        ViewCompat.postInvalidateOnAnimation(this);
    }
    return true;
}

---

From source file:com.brantapps.viewpagerindicator.vertical.VerticalViewPager.java

/**
 * Start a fake drag of the pager./*from w ww  .  j  a  va2 s  . co m*/
 *
 * <p>A fake drag can be useful if you want to synchronize the motion of the ViewPager
 * with the touch scrolling of another view, while still letting the ViewPager
 * control the snapping motion and fling behavior. (e.g. parallax-scrolling tabs.)
 * Call {@link #fakeDragBy(float)} to simulate the actual drag motion. Call
 * {@link #endFakeDrag()} to complete the fake drag and fling as necessary.
 *
 * <p>During a fake drag the ViewPager will ignore all touch events. If a real drag
 * is already in progress, this method will return false.
 *
 * @return true if the fake drag began successfully, false if it could not be started.
 *
 * @see #fakeDragBy(float)
 * @see #endFakeDrag()
 */
public boolean beginFakeDrag() {
    if (mIsBeingDragged) {
        return false;
    }
    mFakeDragging = true;
    setScrollState(SCROLL_STATE_DRAGGING);
    // BrantApps Change: Changed setting of mLastMotionX to mLastMotionY
    mInitialMotionY = mLastMotionY = 0;
    if (mVelocityTracker == null) {
        mVelocityTracker = VelocityTracker.obtain();
    } else {
        mVelocityTracker.clear();
    }
    final long time = SystemClock.uptimeMillis();
    final MotionEvent ev = MotionEvent.obtain(time, time, MotionEvent.ACTION_DOWN, 0, 0, 0);
    mVelocityTracker.addMovement(ev);
    ev.recycle();
    mFakeDragBeginTime = time;
    return true;
}

---

From source file:com.example.sky.test.view.ViewPager.java

@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
    /*/*from   w w w .j a  va2  s . c  o m*/
     * This method JUST determines whether we want to intercept the motion.
     * If we return true, onMotionEvent will be called and we do the actual
     * scrolling there.
     */

    final int action = ev.getAction() & MotionEventCompat.ACTION_MASK;

    // Always take care of the touch gesture being complete.
    if (action == MotionEvent.ACTION_CANCEL || action == MotionEvent.ACTION_UP) {
        // Release the drag.
        if (DEBUG)
            Log.v(TAG, "Intercept done!");
        resetTouch();
        return false;
    }

    // Nothing more to do here if we have decided whether or not we
    // are dragging.
    if (action != MotionEvent.ACTION_DOWN) {
        if (mIsBeingDragged) {
            if (DEBUG)
                Log.v(TAG, "Intercept returning true!");
            return true;
        }
        if (mIsUnableToDrag) {
            if (DEBUG)
                Log.v(TAG, "Intercept returning false!");
            return false;
        }
    }

    switch (action) {
    case MotionEvent.ACTION_MOVE: {
        /*
         * mIsBeingDragged == false, otherwise the shortcut would have caught it. Check
         * whether the user has moved far enough from his original down touch.
         */

        /*
        * Locally do absolute value. mLastMotionY is set to the y value
        * of the down event.
        */
        final int activePointerId = mActivePointerId;
        if (activePointerId == INVALID_POINTER) {
            // If we don't have a valid id, the touch down wasn't on content.
            break;
        }

        final int pointerIndex = ev.findPointerIndex(activePointerId);
        final float x = ev.getX(pointerIndex);
        final float dx = x - mLastMotionX;
        final float xDiff = Math.abs(dx);
        final float y = ev.getY(pointerIndex);
        final float yDiff = Math.abs(y - mInitialMotionY);
        if (DEBUG)
            Log.v(TAG, "Moved x to " + x + "," + y + " diff=" + xDiff + "," + yDiff);

        if (dx != 0 && !isGutterDrag(mLastMotionX, dx) && canScroll(this, false, (int) dx, (int) x, (int) y)) {
            // Nested view has scrollable area under this point. Let it be handled there.
            mLastMotionX = x;
            mLastMotionY = y;
            mIsUnableToDrag = true;
            return false;
        }
        if (xDiff > mTouchSlop && xDiff * 0.5f > yDiff) {
            if (DEBUG)
                Log.v(TAG, "Starting drag!");
            mIsBeingDragged = true;
            requestParentDisallowInterceptTouchEvent(true);
            setScrollState(SCROLL_STATE_DRAGGING);
            mLastMotionX = dx > 0 ? mInitialMotionX + mTouchSlop : mInitialMotionX - mTouchSlop;
            mLastMotionY = y;
            setScrollingCacheEnabled(true);
        } else if (yDiff > mTouchSlop) {
            // The finger has moved enough in the vertical
            // direction to be counted as a drag...  abort
            // any attempt to drag horizontally, to work correctly
            // with children that have scrolling containers.
            if (DEBUG)
                Log.v(TAG, "Starting unable to drag!");
            mIsUnableToDrag = true;
        }
        if (mIsBeingDragged) {
            // Scroll to follow the motion event
            if (performDrag(x)) {
                ViewCompat.postInvalidateOnAnimation(this);
            }
        }
        break;
    }

    case MotionEvent.ACTION_DOWN: {
        /*
         * Remember location of down touch.
         * ACTION_DOWN always refers to pointer index 0.
         */
        mLastMotionX = mInitialMotionX = ev.getX();
        mLastMotionY = mInitialMotionY = ev.getY();
        mActivePointerId = ev.getPointerId(0);
        mIsUnableToDrag = false;

        mIsScrollStarted = true;
        mScroller.computeScrollOffset();
        if (mScrollState == SCROLL_STATE_SETTLING
                && Math.abs(mScroller.getFinalX() - mScroller.getCurrX()) > mCloseEnough) {
            // Let the user 'catch' the pager as it animates.
            mScroller.abortAnimation();
            mPopulatePending = false;
            populate();
            mIsBeingDragged = true;
            requestParentDisallowInterceptTouchEvent(true);
            setScrollState(SCROLL_STATE_DRAGGING);
        } else {
            completeScroll(false);
            mIsBeingDragged = false;
        }

        if (DEBUG) {
            Log.v(TAG, "Down at " + mLastMotionX + "," + mLastMotionY + " mIsBeingDragged=" + mIsBeingDragged
                    + "mIsUnableToDrag=" + mIsUnableToDrag);
        }
        break;
    }

    case MotionEventCompat.ACTION_POINTER_UP:
        onSecondaryPointerUp(ev);
        break;
    }

    if (mVelocityTracker == null) {
        mVelocityTracker = VelocityTracker.obtain();
    }
    mVelocityTracker.addMovement(ev);

    /*
     * The only time we want to intercept motion events is if we are in the
     * drag mode.
     */
    return mIsBeingDragged;
}

---

From source file:org.nekC.android.support.widget.RecyclerView.java

@Override
public boolean onInterceptTouchEvent(MotionEvent e) {
    if (dispatchOnItemTouchIntercept(e)) {
        cancelTouch();/* w w w . j av a2  s  .c  om*/
        return true;
    }

    final boolean canScrollHorizontally = mLayout.canScrollHorizontally();
    final boolean canScrollVertically = mLayout.canScrollVertically();

    if (mVelocityTracker == null) {
        mVelocityTracker = VelocityTracker.obtain();
    }
    mVelocityTracker.addMovement(e);

    final int action = MotionEventCompat.getActionMasked(e);
    final int actionIndex = MotionEventCompat.getActionIndex(e);

    switch (action) {
    case MotionEvent.ACTION_DOWN:
        mScrollPointerId = MotionEventCompat.getPointerId(e, 0);
        mInitialTouchX = mLastTouchX = (int) (e.getX() + 0.5f);
        mInitialTouchY = mLastTouchY = (int) (e.getY() + 0.5f);

        if (mScrollState == SCROLL_STATE_SETTLING) {
            getParent().requestDisallowInterceptTouchEvent(true);
            setScrollState(SCROLL_STATE_DRAGGING);
        }

        int nestedScrollAxis = ViewCompat.SCROLL_AXIS_NONE;
        if (canScrollHorizontally) {
            nestedScrollAxis |= ViewCompat.SCROLL_AXIS_HORIZONTAL;
        }
        if (canScrollVertically) {
            nestedScrollAxis |= ViewCompat.SCROLL_AXIS_VERTICAL;
        }
        startNestedScroll(nestedScrollAxis);
        break;

    case MotionEventCompat.ACTION_POINTER_DOWN:
        mScrollPointerId = MotionEventCompat.getPointerId(e, actionIndex);
        mInitialTouchX = mLastTouchX = (int) (MotionEventCompat.getX(e, actionIndex) + 0.5f);
        mInitialTouchY = mLastTouchY = (int) (MotionEventCompat.getY(e, actionIndex) + 0.5f);
        break;

    case MotionEvent.ACTION_MOVE: {
        final int index = MotionEventCompat.findPointerIndex(e, mScrollPointerId);
        if (index < 0) {
            Log.e(TAG, "Error processing scroll; pointer index for id " + mScrollPointerId
                    + " not found. Did any MotionEvents get skipped?");
            return false;
        }

        final int x = (int) (MotionEventCompat.getX(e, index) + 0.5f);
        final int y = (int) (MotionEventCompat.getY(e, index) + 0.5f);
        if (mScrollState != SCROLL_STATE_DRAGGING) {
            final int dx = x - mInitialTouchX;
            final int dy = y - mInitialTouchY;
            boolean startScroll = false;
            if (canScrollHorizontally && Math.abs(dx) > mTouchSlop) {
                mLastTouchX = mInitialTouchX + mTouchSlop * (dx < 0 ? -1 : 1);
                startScroll = true;
            }
            if (canScrollVertically && Math.abs(dy) > mTouchSlop) {
                mLastTouchY = mInitialTouchY + mTouchSlop * (dy < 0 ? -1 : 1);
                startScroll = true;
            }
            if (startScroll) {
                setScrollState(SCROLL_STATE_DRAGGING);
            }
        }
    }
        break;

    case MotionEventCompat.ACTION_POINTER_UP: {
        onPointerUp(e);
    }
        break;

    case MotionEvent.ACTION_UP: {
        mVelocityTracker.clear();
        stopNestedScroll();
    }
        break;

    case MotionEvent.ACTION_CANCEL: {
        cancelTouch();
    }
    }
    return mScrollState == SCROLL_STATE_DRAGGING;
}

---

From source file:com.viewpagerindicator.MyDirectionalViewPager.java

@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
    /*//from ww w .  ja v  a  2 s .c o  m
     * This method JUST determines whether we want to intercept the motion.
     * If we return true, onMotionEvent will be called and we do the actual
     * scrolling there.
     */

    final int action = ev.getAction() & MotionEventCompat.ACTION_MASK;

    // Always take care of the touch gesture being complete.
    if (action == MotionEvent.ACTION_CANCEL || action == MotionEvent.ACTION_UP) {
        // Release the drag.
        if (DEBUG)
            Log.v(TAG, "Intercept done!");
        mIsBeingDragged = false;
        mIsUnableToDrag = false;
        mActivePointerId = INVALID_POINTER;
        if (mVelocityTracker != null) {
            mVelocityTracker.recycle();
            mVelocityTracker = null;
        }
        return false;
    }

    // Nothing more to do here if we have decided whether or not we
    // are dragging.
    if (action != MotionEvent.ACTION_DOWN) {
        if (mIsBeingDragged) {
            if (DEBUG)
                Log.v(TAG, "Intercept returning true!");
            return true;
        }
        if (mIsUnableToDrag) {
            if (DEBUG)
                Log.v(TAG, "Intercept returning false!");
            return false;
        }
    }

    switch (action) {
    case MotionEvent.ACTION_MOVE: {
        /*
         * mIsBeingDragged == false, otherwise the shortcut would have caught it. Check
         * whether the user has moved far enough from his original down touch.
         */

        /*
        * Locally do absolute value. mLastMotionY is set to the y value
        * of the down event.
        */
        final int activePointerId = mActivePointerId;
        if (activePointerId == INVALID_POINTER) {
            // If we don't have a valid id, the touch down wasn't on content.
            break;
        }

        final int pointerIndex = MotionEventCompat.findPointerIndex(ev, activePointerId);
        final float x = MotionEventCompat.getX(ev, pointerIndex);
        final float dx = x - mLastMotionX;
        final float xDiff = Math.abs(dx);
        final float y = MotionEventCompat.getY(ev, pointerIndex);
        final float dy = y - mInitialMotionY;
        final float yDiff = Math.abs(dy);
        if (DEBUG)
            Log.v(TAG, "Moved x to " + x + "," + y + " diff=" + xDiff + "," + yDiff);

        float primaryDiff;
        float secondaryDiff;

        if (mOrientation == HORIZONTAL) {
            primaryDiff = xDiff;
            secondaryDiff = yDiff;
            if (dx != 0 && !isGutterDrag(mLastMotionX, dx)
                    && canScroll(this, false, (int) dx, (int) x, (int) y)) {
                // Nested view has scrollable area under this point. Let it be handled there.
                mLastMotionX = x;
                mLastMotionY = y;
                mIsUnableToDrag = true;
                return false;
            }
        } else {
            primaryDiff = yDiff;
            secondaryDiff = xDiff;
            if (dy != 0 && !isGutterDrag(mLastMotionY, dy)
                    && canScroll(this, false, (int) dy, (int) x, (int) y)) {
                // Nested view has scrollable area under this point. Let it be handled there.
                mLastMotionX = x;
                mLastMotionY = y;
                mIsUnableToDrag = true;
                return false;
            }
        }

        if (primaryDiff > mTouchSlop && primaryDiff * 0.5f > secondaryDiff) {
            if (DEBUG)
                Log.v(TAG, "Starting drag!");
            mIsBeingDragged = true;
            requestParentDisallowInterceptTouchEvent(true);
            setScrollState(SCROLL_STATE_DRAGGING);
            if (mOrientation == HORIZONTAL) {
                mLastMotionX = dx > 0 ? mInitialMotionX + mTouchSlop : mInitialMotionX - mTouchSlop;
                mLastMotionY = y;
            } else {
                mLastMotionX = y;
                mLastMotionY = dy > 0 ? mInitialMotionY + mTouchSlop : mInitialMotionY - mTouchSlop;
            }
            setScrollingCacheEnabled(true);
        } else if (secondaryDiff > mTouchSlop) {
            // The finger has moved enough in the vertical
            // direction to be counted as a drag...  abort
            // any attempt to drag horizontally, to work correctly
            // with children that have scrolling containers.
            if (DEBUG)
                Log.v(TAG, "Starting unable to drag!");
            mIsUnableToDrag = true;
        }
        if (mIsBeingDragged) {
            // Scroll to follow the motion event
            if (performDrag(x, y)) {
                ViewCompat.postInvalidateOnAnimation(this);
            }
        }
        break;
    }

    case MotionEvent.ACTION_DOWN: {
        /*
         * Remember location of down touch.
         * ACTION_DOWN always refers to pointer index 0.
         */
        mLastMotionX = mInitialMotionX = ev.getX();
        mLastMotionY = mInitialMotionY = ev.getY();
        mActivePointerId = MotionEventCompat.getPointerId(ev, 0);
        mIsUnableToDrag = false;

        mScroller.computeScrollOffset();
        if (mScrollState == SCROLL_STATE_SETTLING
                && Math.abs(mScroller.getFinalX() - mScroller.getCurrX()) > mCloseEnough) {
            // Let the user 'catch' the pager as it animates.
            mScroller.abortAnimation();
            mPopulatePending = false;
            populate();
            mIsBeingDragged = true;
            requestParentDisallowInterceptTouchEvent(true);
            setScrollState(SCROLL_STATE_DRAGGING);
        } else {
            completeScroll(false);
            mIsBeingDragged = false;
        }

        if (DEBUG)
            Log.v(TAG, "Down at " + mLastMotionX + "," + mLastMotionY + " mIsBeingDragged=" + mIsBeingDragged
                    + "mIsUnableToDrag=" + mIsUnableToDrag);
        break;
    }

    case MotionEventCompat.ACTION_POINTER_UP:
        onSecondaryPointerUp(ev);
        break;
    }

    if (mVelocityTracker == null) {
        mVelocityTracker = VelocityTracker.obtain();
    }
    mVelocityTracker.addMovement(ev);

    /*
     * The only time we want to intercept motion events is if we are in the
     * drag mode.
     */
    return mIsBeingDragged;
}

---

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