Java Code Examples for android.view.VelocityTracker#getXVelocity()

The following examples show how to use android.view.VelocityTracker#getXVelocity() . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.

Example 1

Source File: SdkCenteredViewPager.java From Android-SDK-Demo with MIT License

6 votes

/**
 * 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;
}

Example 2

Source File: CoolViewPager.java From CoolViewPager with Apache License 2.0

6 votes

/**
 * 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;
}

Example 3

Source File: SliderPager.java From Android-Image-Slider with Apache License 2.0

6 votes

/**
 * 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;
}

Example 4

Source File: SwipeTouchHelper.java From StackCardsView with Apache License 2.0

6 votes

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());
}

Example 5

Source File: AbsHListView.java From Klyph with MIT License

6 votes

@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 );
	}
}

Example 6

Source File: Utils.java From Ticket-Analysis with MIT License

6 votes

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;
        }
    }
}

Example 7

Source File: DraggableSwipeBack.java From SwipeBack with Apache License 2.0

5 votes

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

	return velocityTracker.getXVelocity();
}

Example 8

Source File: DraggableDrawer.java From zhangshangwuda with Apache License 2.0

5 votes

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

    return velocityTracker.getXVelocity();
}

Example 9

Source File: PileLayout.java From timecat with Apache License 2.0

5 votes

@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;
}

Example 10

Source File: ElasticPager.java From FlowingPager with Apache License 2.0

5 votes

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

    return velocityTracker.getXVelocity();
}

Example 11

Source File: VelocityTrackerCompat.java From android-recipes-app with Apache License 2.0

4 votes

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

Example 12

Source File: ScrollLayout.java From WifiChat with GNU General Public License v2.0

4 votes

@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;
}

Example 13

Source File: VelocityTrackerCompatHoneycomb.java From guideshow with MIT License

4 votes

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

Example 14

Source File: VelocityTrackerCompat.java From adt-leanback-support with Apache License 2.0

4 votes

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

Example 15

Source File: KJViewPager.java From KJFrameForAndroid with Apache License 2.0

4 votes

@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;
}

Example 16

Source File: SlidingDrawer.java From flickr-uploader with GNU General Public License v2.0

4 votes

@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);
}

Example 17

Source File: VelocityTrackerCompatHoneycomb.java From CodenameOne with GNU General Public License v2.0

4 votes

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

Example 18

Source File: KugouLayout.java From UltimateAndroid with Apache License 2.0

4 votes

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

Example 19

Source File: MyScrollView.java From palmsuda with Apache License 2.0

4 votes

@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;
}

Example 20

Source File: ViewFlow.java From Roid-Library with Apache License 2.0

4 votes

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;
}