android.view.VelocityTracker#getXVelocity ( )源码实例Demo

下面列出了android.view.VelocityTracker#getXVelocity ( ) 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。

源代码1 项目： Android-SDK-Demo 文件： SdkCenteredViewPager.java

/**
 * 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;
}

源代码2 项目： CoolViewPager 文件： CoolViewPager.java

/**
 * 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) velocityTracker.getXVelocity(mActivePointerId);
        mPopulatePending = true;
        final int width = getClientWidth();
        final int scrollX = getScrollX();
        final CoolViewPager.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;
}

源代码3 项目： Android-Image-Slider 文件： SliderPager.java

/**
 * 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) 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;
}

源代码4 项目： Ticket-Analysis 文件： Utils.java

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;
        }
    }
}

源代码5 项目： Klyph 文件： AbsHListView.java

@Override
public void run() {
	final int activeId = mActivePointerId;
	final VelocityTracker vt = mVelocityTracker;
	final OverScroller scroller = mScroller;
	if ( vt == null || activeId == INVALID_POINTER ) {
		return;
	}

	vt.computeCurrentVelocity( 1000, mMaximumVelocity );
	final float xvel = -vt.getXVelocity( activeId );

	if ( Math.abs( xvel ) >= mMinimumVelocity && scroller.isScrollingInDirection( xvel, 0 ) ) {
		// Keep the fling alive a little longer
		postDelayed( this, FLYWHEEL_TIMEOUT );
	} else {
		endFling();
		mTouchMode = TOUCH_MODE_SCROLL;
		reportScrollStateChange( OnScrollListener.SCROLL_STATE_TOUCH_SCROLL );
	}
}

源代码6 项目： StackCardsView 文件： SwipeTouchHelper.java

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());
}

源代码7 项目： FlowingPager 文件： ElasticPager.java

protected float getXVelocity(VelocityTracker velocityTracker) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.FROYO) {
        return velocityTracker.getXVelocity(mActivePointerId);
    }

    return velocityTracker.getXVelocity();
}

源代码8 项目： timecat 文件： PileLayout.java

@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);
            float velocity = velocityTracker.getXVelocity();
            recycleVelocityTracker();

            onRelease(event.getX(), velocity);
            break;
    }
    return true;
}

源代码9 项目： SwipeBack 文件： DraggableSwipeBack.java

protected float getXVelocity(VelocityTracker velocityTracker) {
	if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.FROYO) {
		return velocityTracker.getXVelocity(mActivePointerId);
	}

	return velocityTracker.getXVelocity();
}

源代码10 项目： zhangshangwuda 文件： DraggableDrawer.java

protected float getXVelocity(VelocityTracker velocityTracker) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.FROYO) {
        return velocityTracker.getXVelocity(mActivePointerId);
    }

    return velocityTracker.getXVelocity();
}

源代码11 项目： guideshow 文件： VelocityTrackerCompatHoneycomb.java

public static float getXVelocity(VelocityTracker tracker, int pointerId) {
    return tracker.getXVelocity(pointerId);
}

源代码12 项目： CodenameOne 文件： VelocityTrackerCompatHoneycomb.java

public static float getXVelocity(VelocityTracker tracker, int pointerId) {
    return tracker.getXVelocity(pointerId);
}

源代码13 项目： WifiChat 文件： ScrollLayout.java

@Override
public boolean onTouchEvent(MotionEvent event) {
	if (mVelocityTracker == null) {
		mVelocityTracker = VelocityTracker.obtain();
	}
	mVelocityTracker.addMovement(event);
	final int action = event.getAction();
	final float x = event.getX();
	switch (action) {
	case MotionEvent.ACTION_DOWN:
		if (!mScroller.isFinished()) {
			mScroller.abortAnimation();
		}
		mLastMotionX = x;
		break;

	case MotionEvent.ACTION_MOVE:
		int deltaX = (int) (mLastMotionX - x);
		mLastMotionX = x;
		if (!(mCurScreen == 0 && deltaX < 0 || mCurScreen == getChildCount() - 1
				&& deltaX > 0)) {
			scrollBy(deltaX, 0);
		}
		break;

	case MotionEvent.ACTION_UP:
		final VelocityTracker velocityTracker = mVelocityTracker;
		velocityTracker.computeCurrentVelocity(1000);
		int velocityX = (int) velocityTracker.getXVelocity();
		if (velocityX > SNAP_VELOCITY && mCurScreen > 0) {
			snapToScreen(mCurScreen - 1);
		} else if (velocityX < -SNAP_VELOCITY
				&& mCurScreen < getChildCount() - 1) {
			snapToScreen(mCurScreen + 1);
		} else {
			snapToDestination();
		}
		if (mVelocityTracker != null) {
			mVelocityTracker.recycle();
			mVelocityTracker = null;
		}
		mTouchState = TOUCH_STATE_REST;
		break;

	case MotionEvent.ACTION_CANCEL:
		mTouchState = TOUCH_STATE_REST;
		break;
	}
	return true;
}

源代码14 项目： android-recipes-app 文件： VelocityTrackerCompat.java

@Override
public float getXVelocity(VelocityTracker tracker, int pointerId) {
    return tracker.getXVelocity();
}

源代码15 项目： adt-leanback-support 文件： VelocityTrackerCompat.java

@Override
public float getXVelocity(VelocityTracker tracker, int pointerId) {
    return tracker.getXVelocity();
}

源代码16 项目： KJFrameForAndroid 文件： KJViewPager.java

@Override
public boolean onTouchEvent(MotionEvent event) {
    if (!isScroll) {
        return false;
    }
    if (mVelocityTracker == null) {
        mVelocityTracker = VelocityTracker.obtain();
    }
    mVelocityTracker.addMovement(event);
    final int action = event.getAction();
    final float x = event.getX();
    final float y = event.getY();
    switch (action) {
    case MotionEvent.ACTION_DOWN:
        if (!mScroller.isFinished()) {
            mScroller.abortAnimation();
        }
        mLastMotionX = x;
        mLastMotionY = y;
        break;
    case MotionEvent.ACTION_MOVE:
        int deltaX = (int) (mLastMotionX - x);
        int deltaY = (int) (mLastMotionY - y);
        if (Math.abs(deltaX) < 200 && Math.abs(deltaY) > 10)
            break;
        mLastMotionY = y;
        mLastMotionX = x;
        scrollBy(deltaX, 0);
        break;
    case MotionEvent.ACTION_UP:
        // if (mTouchState == TOUCH_STATE_SCROLLING) {
        final VelocityTracker velocityTracker = mVelocityTracker;
        velocityTracker.computeCurrentVelocity(1000);
        int velocityX = (int) velocityTracker.getXVelocity();
        if (velocityX > SNAP_VELOCITY && mCurScreen > 0) {
            // Fling enough to move left
            snapToScreen(mCurScreen - 1);
        } else if (velocityX < -SNAP_VELOCITY
                && mCurScreen < getChildCount() - 1) {
            // Fling enough to move right
            snapToScreen(mCurScreen + 1);
        } else {
            snapToDestination();
        }
        if (mVelocityTracker != null) {
            mVelocityTracker.recycle();
            mVelocityTracker = null;
        }
        mTouchState = TOUCH_STATE_REST;
        break;
    case MotionEvent.ACTION_CANCEL:
        mTouchState = TOUCH_STATE_REST;
        break;
    }
    return true;
}

源代码17 项目： flickr-uploader 文件： SlidingDrawer.java

@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);
}

源代码18 项目： UltimateAndroid 文件： KugouLayout.java

protected float getXVelocity(VelocityTracker velocityTracker) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.FROYO) {
        return velocityTracker.getXVelocity(mActivePointerId);
    }
    return velocityTracker.getXVelocity();
}

源代码19 项目： palmsuda 文件： MyScrollView.java

@Override
public boolean onTouchEvent(MotionEvent event) {
	if (mVelocityTracker == null) {
		mVelocityTracker = VelocityTracker.obtain();
	}
	mVelocityTracker.addMovement(event);
	final int action = event.getAction();
	final float x = event.getX();
	// final float y = event.getY();
	switch (action) {
		case MotionEvent.ACTION_DOWN :
			if (!mScroller.isFinished()) {
				mScroller.abortAnimation();
			}
			mLastMotionX = x;
			break;
		case MotionEvent.ACTION_MOVE :
			int deltaX = (int) (mLastMotionX - x);
			mLastMotionX = x;
			scrollBy(deltaX, 0);
			updateWallpaperOffset();
			break;
		case MotionEvent.ACTION_UP :
			final VelocityTracker velocityTracker = mVelocityTracker;
			velocityTracker.computeCurrentVelocity(1000);
			int velocityX = (int) velocityTracker.getXVelocity();
			if (velocityX > SNAP_VELOCITY && mCurScreen > 0) {
				snapToScreen(mCurScreen - 1);
			} else if (velocityX < -SNAP_VELOCITY && mCurScreen < getChildCount() - 1) {
				snapToScreen(mCurScreen + 1);
			} else {
				snapToDestination();
			}
			if (mVelocityTracker != null) {
				mVelocityTracker.recycle();
				mVelocityTracker = null;
			}
			mTouchState = TOUCH_STATE_REST;
			break;
		case MotionEvent.ACTION_CANCEL :
			mTouchState = TOUCH_STATE_REST;
			break;
	}
	return true;
}

源代码20 项目： Roid-Library 文件： ViewFlow.java

private boolean handleTouchEvent(MotionEvent event, boolean isIntercept) {
    if (getChildCount() == 0) {
        return false;
    }
    if (mVelocityTracker == null) {
        mVelocityTracker = VelocityTracker.obtain();
    }
    mVelocityTracker.addMovement(event);
    final int action = event.getAction();
    final float x = event.getX();
    switch (action) {
        case MotionEvent.ACTION_DOWN:
            if (!mScroller.isFinished()) {
                mScroller.abortAnimation();
            }
            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) > TOUCH_SLOP;
            if (xMoved) {
                mTouchState = TOUCH_STATE_SCROLLING;
            }
            if (mTouchState == TOUCH_STATE_SCROLLING) {
                if (getParent() != null) {
                    getParent().requestDisallowInterceptTouchEvent(true);
                }
                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() - 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, MAX_VELOCITY);
                int velocityX = (int) velocityTracker.getXVelocity();
                if (velocityX > SNAP_VELOCITY) {
                    previous();
                } else if (velocityX < -SNAP_VELOCITY) {
                    next();
                } else {
                    snapToDestination();
                }
                if (mVelocityTracker != null) {
                    mVelocityTracker.recycle();
                    mVelocityTracker = null;
                }
            }
            mTouchState = TOUCH_STATE_REST;
            if (getParent() != null) {
                getParent().requestDisallowInterceptTouchEvent(false);
            }
            break;
        case MotionEvent.ACTION_CANCEL:
            mTouchState = TOUCH_STATE_REST;
            if (getParent() != null) {
                getParent().requestDisallowInterceptTouchEvent(false);
            }
            if (!isIntercept) {
                snapToDestination();
            }
            break;
    }
    return !isIntercept;
}

方法所在类

android.view.VelocityTracker