下面列出了android.view.VelocityTracker#computeCurrentVelocity ( ) 实例代码，或者点击链接到github查看源代码，也可以在右侧发表评论。
/**
* End a fake drag of the pager.
*
* @see #beginFakeDrag()
* @see #fakeDragBy(float)
*/
public void endFakeDrag() {
if (!mFakeDragging) {
throw new IllegalStateException("No fake drag in progress. Call beginFakeDrag first.");
}
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 int currentPage = ii.position;
final float pageOffset = (((float) scrollX / width) - ii.offset) / ii.widthFactor;
final int totalDelta = (int) (mLastMotionX - mInitialMotionX);
int nextPage = determineTargetPage(currentPage, pageOffset, initialVelocity,
totalDelta);
setCurrentItemInternal(nextPage, true, true, initialVelocity);
endDrag();
mFakeDragging = false;
}
private float getXVelocity() {
float xVelocity = 0;
Class viewpagerClass = ViewPager.class;
try {
Field velocityTrackerField = viewpagerClass.getDeclaredField("mVelocityTracker");
velocityTrackerField.setAccessible(true);
VelocityTracker velocityTracker = (VelocityTracker) velocityTrackerField.get(this);
Field activePointerIdField = viewpagerClass.getDeclaredField("mActivePointerId");
activePointerIdField.setAccessible(true);
Field maximumVelocityField = viewpagerClass.getDeclaredField("mMaximumVelocity");
maximumVelocityField.setAccessible(true);
int maximumVelocity = maximumVelocityField.getInt(this);
velocityTracker.computeCurrentVelocity(1000, maximumVelocity);
xVelocity = VelocityTrackerCompat.getXVelocity(velocityTracker, activePointerIdField.getInt(this));
} catch (Exception ignored) {
}
return xVelocity;
}
/**
* End a fake drag of the pager.
*
* @see #beginFakeDrag()
* @see #fakeDragBy(float)
*/
public void endFakeDrag()
{
if ( !mFakeDragging )
{
throw new IllegalStateException( "No fake drag in progress. Call beginFakeDrag first." );
}
final VelocityTracker velocityTracker = mVelocityTracker;
velocityTracker.computeCurrentVelocity( 1000, mMaximumVelocity );
int initialVelocity = (int) velocityTracker.getXVelocity( mActivePointerId );
mPopulatePending = true;
final int width = getClientWidth();
final int scrollX = getScrollX();
final ItemInfo ii = infoForCurrentScrollPosition();
final int currentPage = ii.position;
final float pageOffset = ( ( (float) scrollX / width ) - ii.offset ) / ii.widthFactor;
final int totalDelta = (int) ( mLastMotionX - mInitialMotionX );
int nextPage = determineTargetPage( currentPage, pageOffset, initialVelocity,
totalDelta );
setCurrentItemInternal( nextPage, true, true, initialVelocity );
endDrag();
mFakeDragging = false;
}
/**
* End a fake drag of the pager.
*
* @see #beginFakeDrag()
* @see #fakeDragBy(float)
*/
public void endFakeDrag() {
if (!mFakeDragging) {
throw new IllegalStateException("No fake drag in progress. Call beginFakeDrag first.");
}
final VelocityTracker velocityTracker = mVelocityTracker;
velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
int initialVelocity = (int) VelocityTrackerCompat.getYVelocity(
velocityTracker, mActivePointerId);
mPopulatePending = true;
final int height = getClientHeight();
final int scrollY = getScrollY();
final ItemInfo ii = infoForCurrentScrollPosition();
final int currentPage = ii.position;
final float pageOffset = (((float) scrollY / height) - ii.offset) / ii.heightFactor;
final int totalDelta = (int) (mLastMotionY - mInitialMotionY);
int nextPage = determineTargetPage(currentPage, pageOffset, initialVelocity,
totalDelta);
setCurrentItemInternal(nextPage, true, true, initialVelocity);
endDrag();
mFakeDragging = false;
}
/**
* End a fake drag of the pager.
*
* @see #beginFakeDrag()
* @see #fakeDragBy(float)
*/
public void endFakeDrag() {
if (!mFakeDragging) {
throw new IllegalStateException("No fake drag in progress. Call beginFakeDrag first.");
}
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 int currentPage = ii.position;
final float pageOffset = (((float) scrollX / width) - ii.offset) / ii.widthFactor;
final int totalDelta = (int) (mLastMotionX - mInitialMotionX);
int nextPage = determineTargetPage(currentPage, pageOffset, initialVelocity,
totalDelta);
setCurrentItemInternal(nextPage, true, true, initialVelocity);
endDrag();
mFakeDragging = false;
}
private void onTouchRelease() {
final StackCardsView.LayoutParams lp = (StackCardsView.LayoutParams) mTouchChild.getLayoutParams();
if (lp.fastDismissAllowed) {
final VelocityTracker velocityTracker2 = mVelocityTracker;
velocityTracker2.computeCurrentVelocity(1000, mMaxVelocity);
float xv = velocityTracker2.getXVelocity(mActivePointerId);
float yv = velocityTracker2.getYVelocity(mActivePointerId);
if (doFastDisappear(xv, yv)) {
resetTouch();
return;
}
}
if (isDistanceAllowDismiss() && isDirectionAllowDismiss()) {
doSlowDisappear();
} else {
animateToInitPos();
}
resetTouch();
mSwipeView.onCoverStatusChanged(isCoverIdle());
}
private void endSwipe(VelocityTracker velocityTracker) {
float maxVelocity = MAX_DISMISS_VELOCITY * mDensityScale;
velocityTracker.computeCurrentVelocity(1000 /* px/sec */, maxVelocity);
float velocity = getVelocity(velocityTracker);
float perpendicularVelocity = getPerpendicularVelocity(velocityTracker);
float escapeVelocity = SWIPE_ESCAPE_VELOCITY * mDensityScale;
float translation = getTranslation(mCurrView);
// Decide whether to dismiss the current view
boolean childSwipedFarEnough = Math.abs(translation) > 0.6 * getSize(mCurrView);
boolean childSwipedFastEnough = (Math.abs(velocity) > escapeVelocity) &&
(Math.abs(velocity) > Math.abs(perpendicularVelocity)) &&
(velocity > 0) == (translation > 0);
boolean dismissChild = mCallback.canChildBeDismissed(mCurrView)
&& isValidSwipeDirection(translation)
&& (childSwipedFastEnough || childSwipedFarEnough);
if (dismissChild) {
// flingadingy
dismissChild(mCurrView, childSwipedFastEnough ? velocity : 0f);
} else {
// snappity
mCallback.onDragCancelled(mCurrView);
snapChild(mCurrView, velocity);
}
}
/**
* End a fake drag of the pager.
*
* @see #beginFakeDrag()
* @see #fakeDragBy(float)
*/
public void endFakeDrag() {
if (!mFakeDragging) {
throw new IllegalStateException("No fake drag in progress. Call beginFakeDrag first.");
}
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 int currentPage = ii.position;
final float pageOffset = (((float) scrollX / width) - ii.offset) / ii.widthFactor;
final int totalDelta = (int) (mLastMotionX - mInitialMotionX);
int nextPage = determineTargetPage(currentPage, pageOffset, initialVelocity,
totalDelta);
setCurrentItemInternal(nextPage, true, true, initialVelocity);
endDrag();
mFakeDragging = false;
}
/**
* End a fake drag of the pager.
*
* @see #beginFakeDrag()
* @see #fakeDragBy(float)
*/
public void endFakeDrag() {
if (!mFakeDragging) {
throw new IllegalStateException("No fake drag in progress. Call beginFakeDrag first.");
}
final VelocityTracker velocityTracker = mVelocityTracker;
velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
int initialVelocity = (int) VelocityTrackerCompat.getYVelocity(
velocityTracker, mActivePointerId);
mPopulatePending = true;
final int height = getClientHeight();
final int scrollY = getScrollY();
final ItemInfo ii = infoForCurrentScrollPosition();
final int currentPage = ii.position;
final float pageOffset = (((float) scrollY / height) - ii.offset) / ii.heightFactor;
final int totalDelta = (int) (mLastMotionY - mInitialMotionY);
int nextPage = determineTargetPage(currentPage, pageOffset, initialVelocity,
totalDelta);
setCurrentItemInternal(nextPage, true, true, initialVelocity);
endDrag();
mFakeDragging = false;
}
public static void velocityTrackerPointerUpCleanUpIfNecessary(MotionEvent ev,
VelocityTracker tracker) {
// Check the dot product of current velocities.
// If the pointer that left was opposing another velocity vector, clear.
tracker.computeCurrentVelocity(1000, mMaximumFlingVelocity);
final int upIndex = ev.getActionIndex();
final int id1 = ev.getPointerId(upIndex);
final float x1 = tracker.getXVelocity(id1);
final float y1 = tracker.getYVelocity(id1);
for (int i = 0, count = ev.getPointerCount(); i < count; i++) {
if (i == upIndex)
continue;
final int id2 = ev.getPointerId(i);
final float x = x1 * tracker.getXVelocity(id2);
final float y = y1 * tracker.getYVelocity(id2);
final float dot = x + y;
if (dot < 0) {
tracker.clear();
break;
}
}
}
private float getXVelocity() {
float xVelocity = 0;
Class viewpagerClass = ViewPager.class;
try {
Field velocityTrackerField = viewpagerClass.getDeclaredField("mVelocityTracker");
velocityTrackerField.setAccessible(true);
VelocityTracker velocityTracker = (VelocityTracker) velocityTrackerField.get(this);
Field activePointerIdField = viewpagerClass.getDeclaredField("mActivePointerId");
activePointerIdField.setAccessible(true);
Field maximumVelocityField = viewpagerClass.getDeclaredField("mMaximumVelocity");
maximumVelocityField.setAccessible(true);
int maximumVelocity = maximumVelocityField.getInt(this);
velocityTracker.computeCurrentVelocity(1000, maximumVelocity);
xVelocity = VelocityTrackerCompat.getXVelocity(velocityTracker, activePointerIdField.getInt(this));
} catch (Exception e) {
}
return xVelocity;
}
/**
* End a fake drag of the pager.
*
* @see #beginFakeDrag()
* @see #fakeDragBy(float)
*/
public void endFakeDrag() {
if (!mFakeDragging) {
throw new IllegalStateException("No fake drag in progress. Call beginFakeDrag first.");
}
final VelocityTracker velocityTracker = mVelocityTracker;
velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
int initialVelocity = (int) VelocityTrackerCompat.getYVelocity(
velocityTracker, mActivePointerId);
mPopulatePending = true;
final int height = getClientHeight();
final int scrollY = getScrollY();
final ItemInfo ii = infoForCurrentScrollPosition();
final int currentPage = ii.position;
final float pageOffset = (((float) scrollY / height) - ii.offset) / ii.heightFactor;
final int totalDelta = (int) (mLastMotionY - mInitialMotionY);
int nextPage = determineTargetPage(currentPage, pageOffset, initialVelocity,
totalDelta);
setCurrentItemInternal(nextPage, true, true, initialVelocity);
endDrag();
mFakeDragging = false;
}
/**
* End a fake drag of the pager.
*
* @see #beginFakeDrag()
* @see #fakeDragBy(float)
*/
public void endFakeDrag() {
if (!mFakeDragging) {
throw new IllegalStateException("No fake drag in progress. Call beginFakeDrag first.");
}
if (mAdapter != null) {
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 int currentPage = ii.position;
final float pageOffset = (((float) scrollX / width) - ii.offset) / ii.widthFactor;
final int totalDelta = (int) (mLastMotionX - mInitialMotionX);
int nextPage = determineTargetPage(currentPage, pageOffset, initialVelocity,
totalDelta);
setCurrentItemInternal(nextPage, true, true, initialVelocity);
}
endDrag();
mFakeDragging = false;
}
public static void velocityTrackerPointerUpCleanUpIfNecessary(MotionEvent ev,
VelocityTracker tracker) {
// Check the dot product of current velocities.
// If the pointer that left was opposing another velocity vector, clear.
tracker.computeCurrentVelocity(1000, mMaximumFlingVelocity);
final int upIndex = ev.getActionIndex();
final int id1 = ev.getPointerId(upIndex);
final float x1 = tracker.getXVelocity(id1);
final float y1 = tracker.getYVelocity(id1);
for (int i = 0, count = ev.getPointerCount(); i < count; i++) {
if (i == upIndex)
continue;
final int id2 = ev.getPointerId(i);
final float x = x1 * tracker.getXVelocity(id2);
final float y = y1 * tracker.getYVelocity(id2);
final float dot = x + y;
if (dot < 0) {
tracker.clear();
break;
}
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
mVelocityTracker.addMovement(event);
int action = event.getActionMasked();
switch (action) {
case MotionEvent.ACTION_DOWN:
// 此处说明底层没有子View愿意消费Touch事件
break;
case MotionEvent.ACTION_MOVE:
int currentX = (int) event.getX();
int dx = (int) (currentX - lastX);
requireScrollChange(dx);
lastX = currentX;
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
final VelocityTracker velocityTracker = mVelocityTracker;
velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
int velocity = (int) velocityTracker.getXVelocity();
recycleVelocityTracker();
onRelease(event.getX(), velocity);
break;
default:
break;
}
return true;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (mLocked) {
return true;
}
if (mTracking) {
mVelocityTracker.addMovement(event);
final int action = event.getAction();
switch (action) {
case MotionEvent.ACTION_MOVE:
moveHandle((int) (event.getY()));
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL: {
final VelocityTracker velocityTracker = mVelocityTracker;
velocityTracker.computeCurrentVelocity(mVelocityUnits);
float yVelocity = velocityTracker.getYVelocity();
float xVelocity = velocityTracker.getXVelocity();
boolean negative;
negative = yVelocity < 0;
if (xVelocity < 0) {
xVelocity = -xVelocity;
}
if (xVelocity > mMaximumMinorVelocity) {
xVelocity = mMaximumMinorVelocity;
}
float velocity = (float) Math.hypot(xVelocity, yVelocity);
if (negative) {
velocity = -velocity;
}
final int top = mHandle.getTop();
if (Math.abs(velocity) < mMaximumTapVelocity) {
if ((mExpanded && top < mTapThreshold + mTopOffset) || (!mExpanded && top > mBottomOffset + getBottom() - getTop() - mHandleHeight - mTapThreshold)) {
if (mAllowSingleTap) {
playSoundEffect(SoundEffectConstants.CLICK);
if (mExpanded) {
animateClose(top);
} else {
animateOpen(top);
}
} else {
performFling(top, velocity, false);
}
} else {
performFling(top, velocity, false);
}
} else {
performFling(top, velocity, false);
}
}
break;
}
}
return mTracking || mAnimating || super.onTouchEvent(event);
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
if (getChildCount() == 0)
return false;
if (mVelocityTracker == null) {
mVelocityTracker = VelocityTracker.obtain();
}
mVelocityTracker.addMovement(ev);
mHandler.removeMessages(CANCLE_MSG);
final int action = ev.getAction();
final float x = ev.getX();
switch (action) {
case MotionEvent.ACTION_DOWN:
/*
* If being flinged and user touches, stop the fling. isFinished
* will be false if being flinged.
*/
if (!mScroller.isFinished()) {
mScroller.abortAnimation();
}
// Remember where the motion event started
mLastMotionX = x;
mTouchState = mScroller.isFinished() ? TOUCH_STATE_REST
: TOUCH_STATE_SCROLLING;
break;
case MotionEvent.ACTION_MOVE:
final int deltaX = (int) (mLastMotionX - x);
boolean xMoved = Math.abs(deltaX) > mTouchSlop;
if (xMoved) {
// Scroll if the user moved far enough along the X axis
mTouchState = TOUCH_STATE_SCROLLING;
if (mViewInitializeListener != null)
initializeView(deltaX);
}
if (mTouchState == TOUCH_STATE_SCROLLING) {
// Scroll to follow the motion event
mLastMotionX = x;
final int scrollX = getScrollX();
if (deltaX < 0) {
if (scrollX > 0) {
scrollBy(Math.max(-scrollX, deltaX), 0);
}
} else if (deltaX > 0) {
final int availableToScroll = getChildAt(
getChildCount() - 1).getRight()
- getPaddingRight() - getHorizontalFadingEdgeLength()
- scrollX - getWidth();
if (availableToScroll > 0) {
scrollBy(Math.min(availableToScroll, deltaX), 0);
}
}
return true;
}
break;
case MotionEvent.ACTION_UP:
if (mTouchState == TOUCH_STATE_SCROLLING) {
final VelocityTracker velocityTracker = mVelocityTracker;
velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
int velocityX = (int) velocityTracker.getXVelocity();
if (velocityX > SNAP_VELOCITY && mCurrentScreen > 0) {
// Fling hard enough to move left
snapToScreen(mCurrentScreen - 1);
} else if (velocityX < -SNAP_VELOCITY
&& mCurrentScreen < getChildCount() - 1) {
// Fling hard enough to move right
snapToScreen(mCurrentScreen + 1);
} else {
snapToDestination();
}
if (mVelocityTracker != null) {
mVelocityTracker.recycle();
mVelocityTracker = null;
}
}
mTouchState = TOUCH_STATE_REST;
break;
case MotionEvent.ACTION_CANCEL:
mTouchState = TOUCH_STATE_REST;
}
return false;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (mLocked) {
return true;
}
if (mTracking) {
mVelocityTracker.addMovement(event);
final int action = event.getAction();
switch (action) {
case MotionEvent.ACTION_MOVE:
moveHandle((int) (mVertical ? event.getY() : event.getX()) - mTouchDelta);
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL: {
final VelocityTracker velocityTracker = mVelocityTracker;
velocityTracker.computeCurrentVelocity(mVelocityUnits);
float yVelocity = velocityTracker.getYVelocity();
float xVelocity = velocityTracker.getXVelocity();
boolean negative;
final boolean vertical = mVertical;
if (vertical) {
negative = yVelocity < 0;
if (xVelocity < 0) {
xVelocity = -xVelocity;
}
if (xVelocity > mMaximumMinorVelocity) {
xVelocity = mMaximumMinorVelocity;
}
} else {
negative = xVelocity < 0;
if (yVelocity < 0) {
yVelocity = -yVelocity;
}
if (yVelocity > mMaximumMinorVelocity) {
yVelocity = mMaximumMinorVelocity;
}
}
float velocity = (float) Math.hypot(xVelocity, yVelocity);
if (negative) {
velocity = -velocity;
}
final int top = mHandle.getTop();
final int left = mHandle.getLeft();
if (Math.abs(velocity) < mMaximumTapVelocity) {
if (inThreshold(top, left)) {
if (mAllowSingleTap) {
playSoundEffect(SoundEffectConstants.CLICK);
if (mExpanded) {
//animateClose(vertical ? top : left);
animateClose(getSide());
} else {
animateOpen(getSide());
//animateOpen(vertical ? top : left);
}
} else {
performFling(vertical ? top : left, velocity, false);
}
} else {
performFling(vertical ? top : left, velocity, false);
}
} else {
performFling(vertical ? top : left, velocity, false);
}
}
break;
}
}
return mTracking || mAnimating || super.onTouchEvent(event);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (vTracker == null) {
vTracker = VelocityTracker.obtain();
}
vTracker.addMovement(event);
float currentY = event.getY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
downY = event.getY();
downX = event.getX();
if (!currentViewRect.contains((int) downX, (int) downY)) {
return false;
}
break;
case MotionEvent.ACTION_MOVE:
distanceY = currentY - downY;
if (Math.abs(distanceY) > mTouchSlop) {
if (pageChangeListener != null) {
pageChangeListener.onPageScrolled(currentItem, (int) Math.abs(distanceY) / getHeight(), (int) distanceY);
pageChangeListener.onPageScrollStateChanged(SCROLL_STATE_DRAGGING);
}
tranSpring.setEndValue(distanceY);
float degree = MAX_DEGREE * distanceY / mHeight;
if (downX < mWidth / 2) {
degree = -degree;
}
rotateSpring.setEndValue(degree);
}
break;
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:
if (Math.abs(distanceY) > mTouchSlop) {
if (pageChangeListener != null) {
pageChangeListener.onPageScrollStateChanged(SCROLL_STATE_SETTLING);
}
final VelocityTracker tracker = vTracker;
tracker.computeCurrentVelocity(UNIT);
float velocityY = tracker.getYVelocity();
animOutIfNeeded(currentY - downY, velocityY);
if (vTracker != null) {
vTracker.recycle();
vTracker = null;
}
}
break;
}
return true;
}
public boolean onTouchEvent(MotionEvent ev) {
if (this.mFakeDragging) {
return true;
}
if (ev.getAction() == 0 && ev.getEdgeFlags() != 0) {
return false;
}
if (this.mAdapter == null || this.mAdapter.getCount() == 0) {
return false;
}
if (this.mVelocityTracker == null) {
this.mVelocityTracker = VelocityTracker.obtain();
}
this.mVelocityTracker.addMovement(ev);
boolean needsInvalidate = false;
float x;
switch (ev.getAction() & 255) {
case 0:
this.mScroller.abortAnimation();
this.mPopulatePending = false;
populate();
x = ev.getX();
this.mInitialMotionX = x;
this.mLastMotionX = x;
x = ev.getY();
this.mInitialMotionY = x;
this.mLastMotionY = x;
this.mActivePointerId = MotionEventCompat.getPointerId(ev, 0);
break;
case 1:
if (this.mIsBeingDragged) {
VelocityTracker velocityTracker = this.mVelocityTracker;
velocityTracker.computeCurrentVelocity(1000, (float) this.mMaximumVelocity);
int initialVelocity = (int) VelocityTrackerCompat.getXVelocity(velocityTracker, this.mActivePointerId);
this.mPopulatePending = true;
int width = getClientWidth();
int scrollX = getScrollX();
ItemInfo ii = infoForCurrentScrollPosition();
setCurrentItemInternal(determineTargetPage(ii.position, ((((float) scrollX) / ((float) width)) - ii.offset) / ii.widthFactor, initialVelocity, (int) (MotionEventCompat.getX(ev, MotionEventCompat.findPointerIndex(ev, this.mActivePointerId)) - this.mInitialMotionX)), true, true, initialVelocity);
needsInvalidate = resetTouch();
break;
}
break;
case 2:
if (!this.mIsBeingDragged) {
int pointerIndex = MotionEventCompat.findPointerIndex(ev, this.mActivePointerId);
if (pointerIndex == -1) {
needsInvalidate = resetTouch();
break;
}
float x2 = MotionEventCompat.getX(ev, pointerIndex);
float xDiff = Math.abs(x2 - this.mLastMotionX);
float y = MotionEventCompat.getY(ev, pointerIndex);
float yDiff = Math.abs(y - this.mLastMotionY);
if (xDiff > ((float) this.mTouchSlop) && xDiff > yDiff) {
this.mIsBeingDragged = true;
requestParentDisallowInterceptTouchEvent(true);
if (x2 - this.mInitialMotionX > 0.0f) {
x = this.mInitialMotionX + ((float) this.mTouchSlop);
} else {
x = this.mInitialMotionX - ((float) this.mTouchSlop);
}
this.mLastMotionX = x;
this.mLastMotionY = y;
setScrollState(1);
setScrollingCacheEnabled(true);
ViewParent parent = getParent();
if (parent != null) {
parent.requestDisallowInterceptTouchEvent(true);
}
}
}
if (this.mIsBeingDragged) {
needsInvalidate = false | performDrag(MotionEventCompat.getX(ev, MotionEventCompat.findPointerIndex(ev, this.mActivePointerId)));
break;
}
break;
case 3:
if (this.mIsBeingDragged) {
scrollToItem(this.mCurItem, true, 0, false);
needsInvalidate = resetTouch();
break;
}
break;
case 5:
int index = MotionEventCompat.getActionIndex(ev);
this.mLastMotionX = MotionEventCompat.getX(ev, index);
this.mActivePointerId = MotionEventCompat.getPointerId(ev, index);
break;
case 6:
onSecondaryPointerUp(ev);
this.mLastMotionX = MotionEventCompat.getX(ev, MotionEventCompat.findPointerIndex(ev, this.mActivePointerId));
break;
}
if (needsInvalidate) {
ViewCompat.postInvalidateOnAnimation(this);
}
return true;
}