List of usage examples for android.view VelocityTracker computeCurrentVelocity
public void computeCurrentVelocity(int units, float maxVelocity)
From source file:Main.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();/* www .j a v a2 s. co m*/ break; } } }
From source file:com.douban.rexxar.view.NestedWebView.java
@Override public boolean onTouchEvent(MotionEvent ev) { if (!mEnableNestedScroll) { return super.onTouchEvent(ev); }//from w w w . j a v a 2 s . c o m boolean returnValue = false; MotionEvent event = MotionEvent.obtain(ev); final int action = MotionEventCompat.getActionMasked(event); if (action == MotionEvent.ACTION_DOWN) { mNestedOffsetY = 0; } int eventX = (int) event.getX(); int eventY = (int) event.getY(); event.offsetLocation(0, -mNestedOffsetY); switch (action) { case MotionEvent.ACTION_MOVE: if (mNestedScrollEstablish) { mVelocityTracker.addMovement(ev); int deltaX = mLastX - eventX; int deltaY = mLastY - eventY; // ??? if (mOptimizeHorizontalScroll) { // ?? if (!mScrollHorizontalEstablish && !mScrollVerticalEstablish) { if (Math.abs(deltaX) > Math.abs(deltaY) * 1.5 && Math.abs(deltaX) > mTouchSlop) { mScrollHorizontalEstablish = true; } else if (Math.abs(deltaY) > Math.abs(deltaX) && Math.abs(deltaY) > mTouchSlop) { mScrollVerticalEstablish = true; mFrozenX = eventX; } } } mLastX = eventX; if (mScrollHorizontalEstablish) { event.offsetLocation(0, deltaY); // ? returnValue = super.onTouchEvent(event); } else { // ? if (dispatchNestedPreScroll(0, deltaY, mScrollConsumed, mOffsetInWindow)) { deltaY -= mScrollConsumed[1]; mLastY = eventY - mOffsetInWindow[1]; mNestedOffsetY += mOffsetInWindow[1]; event.offsetLocation(0, -mOffsetInWindow[1]); } else { mLastY = eventY; } // parent?consumedelta?webView? int oldScrollY = getScrollY(); if ((deltaY < 0 && getScrollY() > 0) || deltaY > 0) { // ??? if (mScrollVerticalEstablish) { event.offsetLocation(mFrozenX - eventX, 0); returnValue = super.onTouchEvent(event); } else { returnValue = super.onTouchEvent(event); } mLastYWebViewConsume = event.getY(); } else { // FIXME ?? if (mScrollVerticalEstablish) { event.offsetLocation(mFrozenX - eventX, mLastYWebViewConsume - event.getY()); } else { event.offsetLocation(0, mLastYWebViewConsume - event.getY()); } super.onTouchEvent(event); } // deltaY if (deltaY == getScrollY() - oldScrollY) { // ??? } else if (deltaY < getScrollY() - oldScrollY) { // if (getScrollY() <= 5) { int dyConsumed = oldScrollY - getScrollY(); int dyUnconsumed = deltaY - (getScrollY() - oldScrollY); if (dispatchNestedScroll(0, dyConsumed, 0, dyUnconsumed, mOffsetInWindow)) { mNestedOffsetY += mOffsetInWindow[1]; mLastY -= mOffsetInWindow[1]; event.offsetLocation(0, mOffsetInWindow[1]); } } returnValue = true; } else { // ??? } } } else { returnValue = super.onTouchEvent(event); } break; case MotionEvent.ACTION_DOWN: mLastYWebViewConsume = event.getY(); returnValue = super.onTouchEvent(event); mLastX = eventX; mLastY = eventY; // start NestedScroll mNestedScrollEstablish = startNestedScroll(ViewCompat.SCROLL_AXIS_VERTICAL); mScrollHorizontalEstablish = false; mScrollVerticalEstablish = false; initOrResetVelocityTracker(); mVelocityTracker.addMovement(ev); break; case MotionEvent.ACTION_CANCEL: if (mNestedScrollEstablish) { returnValue = super.onTouchEvent(event); // end NestedScroll stopNestedScroll(); } else { returnValue = super.onTouchEvent(event); } mScrollHorizontalEstablish = false; mScrollVerticalEstablish = false; mFrozenX = 0; recycleVelocityTracker(); break; case MotionEvent.ACTION_UP: if (mNestedScrollEstablish) { if (mScrollHorizontalEstablish) { // ? event.offsetLocation(0, mLastY - eventY); } returnValue = super.onTouchEvent(event); final VelocityTracker velocityTracker = mVelocityTracker; velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity); int initialVelocity = (int) velocityTracker.getYVelocity(); if ((Math.abs(initialVelocity) > mMinimumVelocity) && getScrollY() == 0) { flingWithNestedDispatch(-initialVelocity); } else {// end NestedScroll stopNestedScroll(); } } else { returnValue = super.onTouchEvent(event); } mScrollHorizontalEstablish = false; mScrollVerticalEstablish = false; mFrozenX = 0; recycleVelocityTracker(); break; } return returnValue; }
From source file:com.conduit.plastic.widget.NestedWebView.java
@Override public boolean onTouchEvent(MotionEvent ev) { if (this.position == ScrollStateChangedListener.ScrollState.MIDDLE) { switch (ev.getAction()) { case MotionEvent.ACTION_DOWN: { this.mIsBeingDragged = false; this.mActivePointerId = MotionEventCompat.getPointerId(ev, 0); this.startNestedScroll(2); break; }//from w ww . j av a 2 s . co m case MotionEvent.ACTION_UP: case MotionEvent.ACTION_CANCEL: { this.endTouch(); break; } } super.onTouchEvent(ev); return true; } final int actionMasked = MotionEventCompat.getActionMasked(ev); initVelocityTrackerIfNotExists(); MotionEvent vtev = MotionEvent.obtain(ev); final int index = MotionEventCompat.getActionIndex(ev); if (actionMasked == MotionEvent.ACTION_DOWN) { mNestedYOffset = 0; } vtev.offsetLocation(0, mNestedYOffset); this.consumedY = 0; this.direction = 0; boolean onTouchEvent = false; switch (actionMasked) { case MotionEvent.ACTION_DOWN: { // Remember where the motion event started onTouchEvent = super.onTouchEvent(ev); mLastMotionY = (int) (ev.getY() + 0.5f); mActivePointerId = MotionEventCompat.getPointerId(ev, 0); this.preY = vtev.getY(); this.mIsBeingDragged = false; startNestedScroll(ViewCompat.SCROLL_AXIS_VERTICAL); break; } case MotionEventCompat.ACTION_POINTER_DOWN: { onTouchEvent = super.onTouchEvent(ev); mLastMotionY = (int) (MotionEventCompat.getY(ev, index) + 0.5f); mActivePointerId = MotionEventCompat.getPointerId(ev, index); break; } case MotionEvent.ACTION_MOVE: final int activePointerIndex = MotionEventCompat.findPointerIndex(ev, mActivePointerId); if (activePointerIndex == -1) { Log.e(TAG, "Invalid pointerId=" + mActivePointerId + " in onTouchEvent"); break; } if (!mIsBeingDragged && Math.abs(vtev.getY() - this.preY) > mTouchSlop) { final ViewParent parent = getParent(); if (parent != null) { parent.requestDisallowInterceptTouchEvent(true); } mIsBeingDragged = true; } // if(!mIsBeingDragged){ // setLongClickEnable(true); // } final int y = (int) (MotionEventCompat.getY(ev, activePointerIndex) + 0.5f); Log.i(TAG, "mLastMotionY=====" + mLastMotionY); Log.i(TAG, "YYYYYYY=====" + y); int deltaY = mLastMotionY - y; if (deltaY != 0) { this.direction = this.directionDetector.getDirection(deltaY, true, this.scrollStateChangedListener); } if (dispatchNestedPreScroll(0, deltaY, mScrollConsumed, mScrollOffset)) { deltaY -= mScrollConsumed[1]; vtev.offsetLocation(0, mScrollOffset[1]); mNestedYOffset += mScrollOffset[1]; } if (mIsBeingDragged) { // setJavaScriptEnable(true); // Scroll to follow the motion event mLastMotionY = y - mScrollOffset[1]; Log.i(TAG, "deltaY===" + deltaY); Log.i(TAG, "this.consumedY===" + this.consumedY); final int unconsumedY = deltaY - this.consumedY; Log.i(TAG, " child consumed = " + this.mScrollConsumed[1] + " un_consumed = " + unconsumedY + " position = " + this.position + " direction = " + this.direction); onTouchEvent = super.onTouchEvent(ev); if (this.position == ScrollStateChangedListener.ScrollState.MIDDLE) { return true; } switch (this.direction) { case 1: { if ((this.position != ScrollStateChangedListener.ScrollState.BOTTOM) && (this.contentHeight != this.webviewHeight)) { scrollBy(0, unconsumedY); break; } Log.i(TAG, "1111111consumedY===" + consumedY + " unconsumedY==" + unconsumedY); if (dispatchNestedScroll(0, this.consumedY, 0, unconsumedY, this.mScrollOffset)) { vtev.offsetLocation(0.0F, this.mScrollOffset[1]); this.mNestedYOffset += this.mScrollOffset[1]; this.mLastMotionY -= this.mScrollOffset[1]; } } break; case 2: if ((this.position == ScrollStateChangedListener.ScrollState.TOP) || (this.contentHeight == this.webviewHeight)) { Log.i(TAG, "2222222consumedY===" + consumedY + " unconsumedY==" + unconsumedY); if (dispatchNestedScroll(0, this.consumedY, 0, unconsumedY, this.mScrollOffset)) { vtev.offsetLocation(0.0F, this.mScrollOffset[1]); this.mNestedYOffset += this.mScrollOffset[1]; this.mLastMotionY -= this.mScrollOffset[1]; } } else { scrollBy(0, unconsumedY); } break; default: break; } } break; case MotionEvent.ACTION_CANCEL: onTouchEvent = super.onTouchEvent(ev); break; case MotionEvent.ACTION_UP: onTouchEvent = super.onTouchEvent(ev); if (mIsBeingDragged) { final VelocityTracker velocityTracker = mVelocityTracker; velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity); int initialVelocity = (int) VelocityTrackerCompat.getYVelocity(velocityTracker, mActivePointerId); if ((Math.abs(initialVelocity) > mMinimumVelocity)) { flingWithNestedDispatch(-initialVelocity); } } mActivePointerId = INVALID_POINTER; endTouch(); break; case MotionEventCompat.ACTION_POINTER_UP: onTouchEvent = super.onTouchEvent(ev); onSecondaryPointerUp(ev); mLastMotionY = (int) (MotionEventCompat.getY(ev, MotionEventCompat.findPointerIndex(ev, mActivePointerId)) + 0.5F); break; } if (mVelocityTracker != null) { mVelocityTracker.addMovement(vtev); } vtev.recycle(); return onTouchEvent; }
From source file:com.coco.slidinguppanel.SlidingUpPanel.java
@Override public boolean onTouchEvent(MotionEvent ev) { if (getState() == STATE_OPENED) { // disable touch handle when in opened state. return false; }/* w w w . ja v a 2 s . c o m*/ final int action = MotionEventCompat.getActionMasked(ev); if (action == MotionEvent.ACTION_DOWN && ev.getEdgeFlags() != 0) { // Don't handle edge touches immediately -- they may actually belong to one of our descendants. return false; } if (mVelocityTracker == null) { mVelocityTracker = VelocityTracker.obtain(); } mVelocityTracker.addMovement(ev); switch (action) { case MotionEvent.ACTION_DOWN: { onTouchDown(ev, false); DEBUG_LOG("Down at " + mLastMotionX + "," + mLastMotionY + " mIsBeingDragged=" + mIsBeingDragged + " mIsUnableToDrag=" + mIsUnableToDrag); break; } case MotionEvent.ACTION_MOVE: { final int activePointerId = mActivePointerId; if (activePointerId == INVALID_POINTER || mIsUnableToDrag) { // 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 y = MotionEventCompat.getY(ev, pointerIndex); final float xDiff = Math.abs(x - mInitialMotionX); final float yDiff = Math.abs(y - mInitialMotionY); DEBUG_LOG("Moved to " + x + "," + y + " diff=" + xDiff + "," + yDiff); onTouchMove(x, y, xDiff, yDiff, false); break; } case MotionEvent.ACTION_UP: { if (mIsBeingDragged) { final VelocityTracker velocityTracker = mVelocityTracker; velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity); final int initialVelocity = (int) VelocityTrackerCompat.getYVelocity(velocityTracker, mActivePointerId); final int pointerIndex = MotionEventCompat.findPointerIndex(ev, mActivePointerId); final float y = MotionEventCompat.getY(ev, pointerIndex); final int totalDelta = (int) (y - mInitialMotionY); boolean toOpen = determineToOpen(initialVelocity, totalDelta); startFling(toOpen, initialVelocity); endDrag(); } DEBUG_LOG("Touch up!!!"); break; } case MotionEvent.ACTION_CANCEL: { if (mIsBeingDragged) { startFling(isOpen(), 0); endDrag(); } DEBUG_LOG("Touch cancel!!!"); break; } case MotionEventCompat.ACTION_POINTER_DOWN: { final int pointerIndex = MotionEventCompat.getActionIndex(ev); final float x = MotionEventCompat.getX(ev, pointerIndex); final float y = MotionEventCompat.getY(ev, pointerIndex); mLastMotionX = x; mLastMotionY = y; mActivePointerId = MotionEventCompat.getPointerId(ev, pointerIndex); break; } case MotionEvent.ACTION_POINTER_UP: onTouchPointerUp(ev); break; } return true; }
From source file:com.gitstudy.rili.liarbry.CalendarLayout.java
@SuppressLint("ClickableViewAccessibility") @Override/*w ww .ja v a 2 s.com*/ public boolean onTouchEvent(MotionEvent event) { if (mDelegate.isShowYearSelectedLayout) { return false; } if (mContentView == null) { return false; } int action = event.getAction(); float y = event.getY(); mVelocityTracker.addMovement(event); switch (action) { case MotionEvent.ACTION_DOWN: int index = MotionEventCompat.getActionIndex(event); mActivePointerId = MotionEventCompat.getPointerId(event, index); mLastY = downY = y; return true; case MotionEventCompat.ACTION_POINTER_DOWN: { final int indexx = MotionEventCompat.getActionIndex(event); mActivePointerId = MotionEventCompat.getPointerId(event, indexx); if (mActivePointerId == 0) { //?? dy = y- mLastY == 0?? mLastY = MotionEventCompat.getY(event, mActivePointerId); } break; } case MotionEvent.ACTION_MOVE: if (mGestureMode == GESTURE_MODE_DISABLED || mCalendarShowMode == CALENDAR_SHOW_MODE_ONLY_MONTH_VIEW || mCalendarShowMode == CALENDAR_SHOW_MODE_ONLY_WEEK_VIEW) {//???? return false; } getPointerIndex(event, mActivePointerId); if (mActivePointerId == INVALID_POINTER) { //?mLastY?y????? dy== 0?? mLastY = y; mActivePointerId = ACTIVE_POINTER; } float dy = y - mLastY; //?contentView? if (dy < 0 && mContentView.getTranslationY() == -mContentViewTranslateY) { //mContentView.onTouchEvent(event); showWeek(); mLastY = y; return false; } hideWeek(); //?contentView? if (dy > 0 && mContentView.getTranslationY() + dy >= 0) { mContentView.setTranslationY(0); translationViewPager(); mLastY = y; return super.onTouchEvent(event); } //?contentView??contentView? if (dy < 0 && mContentView.getTranslationY() + dy <= -mContentViewTranslateY) { mContentView.setTranslationY(-mContentViewTranslateY); translationViewPager(); mLastY = y; return super.onTouchEvent(event); } //? mContentView.setTranslationY(mContentView.getTranslationY() + dy); translationViewPager(); mLastY = y; break; case MotionEvent.ACTION_CANCEL: case MotionEvent.ACTION_POINTER_UP: int pointerIndex = getPointerIndex(event, mActivePointerId); if (mActivePointerId == INVALID_POINTER) break; mLastY = MotionEventCompat.getY(event, pointerIndex); break; case MotionEvent.ACTION_UP: final VelocityTracker velocityTracker = mVelocityTracker; velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity); float mYVelocity = velocityTracker.getYVelocity(); if (mContentView.getTranslationY() == 0 || mContentView.getTranslationY() == mContentViewTranslateY) { break; } if (Math.abs(mYVelocity) >= 800) { if (mYVelocity < 0) { shrink(); } else { expand(); } return super.onTouchEvent(event); } if (event.getY() - downY > 0) { expand(); } else { shrink(); } break; } return super.onTouchEvent(event); }
From source file:com.yj.ecard.ui.views.viewflow.ViewFlow.java
@Override public boolean onInterceptTouchEvent(MotionEvent ev) { if (getChildCount() == 0) return false; if (mVelocityTracker == null) { mVelocityTracker = VelocityTracker.obtain(); }/*from w w w .java 2s . c om*/ mVelocityTracker.addMovement(ev); final int action = ev.getAction(); final float x = ev.getX(); switch (action) { case MotionEvent.ACTION_DOWN: if (parentViewpager != null) parentViewpager.requestDisallowInterceptTouchEvent(true); /* * 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; if (handler != null) { handler.removeMessages(0); } break; case MotionEvent.ACTION_MOVE: if (parentViewpager != null) parentViewpager.requestDisallowInterceptTouchEvent(true); final int xDiff = (int) Math.abs(x - mLastMotionX); boolean xMoved = xDiff > mTouchSlop; if (xMoved) { // Scroll if the user moved far enough along the X axis mTouchState = TOUCH_STATE_SCROLLING; } if (mTouchState == TOUCH_STATE_SCROLLING) { // Scroll to follow the motion event final int deltaX = (int) (mLastMotionX - x); 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 (parentViewpager != null) parentViewpager.requestDisallowInterceptTouchEvent(true); 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; // action_up????? if (handler != null) { Message message = handler.obtainMessage(0); handler.sendMessageDelayed(message, timeSpan); } break; case MotionEvent.ACTION_CANCEL: if (parentViewpager != null) parentViewpager.requestDisallowInterceptTouchEvent(true); mTouchState = TOUCH_STATE_REST; } return false; }
From source file:com.yj.ecard.ui.views.viewflow.ViewFlow.java
@Override public boolean onTouchEvent(MotionEvent ev) { if (getChildCount() == 0) return false; if (mVelocityTracker == null) { mVelocityTracker = VelocityTracker.obtain(); }//from w ww. j av a 2 s . c o m mVelocityTracker.addMovement(ev); 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; // ?? if (handler != null) handler.removeMessages(0); break; case MotionEvent.ACTION_MOVE: final int xDiff = (int) Math.abs(x - mLastMotionX); boolean xMoved = xDiff > mTouchSlop; if (xMoved) { // Scroll if the user moved far enough along the X axis mTouchState = TOUCH_STATE_SCROLLING; } if (mTouchState == TOUCH_STATE_SCROLLING) { // Scroll to follow the motion event final int deltaX = (int) (mLastMotionX - x); 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, 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 if (velocityX < -SNAP_VELOCITY // && mCurrentScreen == getChildCount() - 1) { // snapToScreen(0); // } // else if (velocityX > SNAP_VELOCITY // && mCurrentScreen == 0) { // snapToScreen(getChildCount() - 1); // } else { snapToDestination(); } if (mVelocityTracker != null) { mVelocityTracker.recycle(); mVelocityTracker = null; } } mTouchState = TOUCH_STATE_REST; // action_up????? if (handler != null) { Message message = handler.obtainMessage(0); handler.sendMessageDelayed(message, timeSpan); } break; case MotionEvent.ACTION_CANCEL: snapToDestination(); mTouchState = TOUCH_STATE_REST; } return true; }
From source file:com.jp.fristandroidapp.widget.adview.AdViewFlow.java
@Override public boolean onInterceptTouchEvent(MotionEvent ev) { if (getChildCount() == 0) return false; if (mVelocityTracker == null) { mVelocityTracker = VelocityTracker.obtain(); }// w w w .j a v a2 s .c o m mVelocityTracker.addMovement(ev); final int action = ev.getAction(); final float x = ev.getX(); switch (action) { case MotionEvent.ACTION_DOWN: setIsInterceptParent(true); setIsInterceptParent2(true); setIsInterceptParent3(true); setIsInterceptParent4(true); /* * 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; if (handler != null) handler.removeMessages(0); break; case MotionEvent.ACTION_MOVE: final int xDiff = (int) Math.abs(x - mLastMotionX); boolean xMoved = xDiff > mTouchSlop; if (xMoved) { // Scroll if the user moved far enough along the X axis mTouchState = TOUCH_STATE_SCROLLING; } if (mTouchState == TOUCH_STATE_SCROLLING) { // Scroll to follow the motion event final int deltaX = (int) (mLastMotionX - x); 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, 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; setIsInterceptParent(false); setIsInterceptParent2(false); setIsInterceptParent3(false); setIsInterceptParent4(false); if (handler != null) { Message message = handler.obtainMessage(0); handler.sendMessageDelayed(message, timeSpan); } break; case MotionEvent.ACTION_CANCEL: mTouchState = TOUCH_STATE_REST; setIsInterceptParent(false); setIsInterceptParent2(false); setIsInterceptParent3(false); setIsInterceptParent4(false); } return false; }
From source file:com.jp.fristandroidapp.widget.adview.AdViewFlow.java
@Override public boolean onTouchEvent(MotionEvent ev) { if (getChildCount() == 0) return false; if (mVelocityTracker == null) { mVelocityTracker = VelocityTracker.obtain(); }/*from w w w . ja v a2 s. com*/ mVelocityTracker.addMovement(ev); 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; if (handler != null) handler.removeMessages(0); break; case MotionEvent.ACTION_MOVE: final int xDiff = (int) Math.abs(x - mLastMotionX); boolean xMoved = xDiff > mTouchSlop; if (xMoved) { // Scroll if the user moved far enough along the X axis mTouchState = TOUCH_STATE_SCROLLING; } if (mTouchState == TOUCH_STATE_SCROLLING) { // Scroll to follow the motion event final int deltaX = (int) (mLastMotionX - x); 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, 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 if (velocityX < -SNAP_VELOCITY // && mCurrentScreen == getChildCount() - 1) { // snapToScreen(0); // } // else if (velocityX > SNAP_VELOCITY // && mCurrentScreen == 0) { // snapToScreen(getChildCount() - 1); // } else { snapToDestination(); } if (mVelocityTracker != null) { mVelocityTracker.recycle(); mVelocityTracker = null; } } mTouchState = TOUCH_STATE_REST; if (handler != null) { Message message = handler.obtainMessage(0); handler.sendMessageDelayed(message, timeSpan); } break; case MotionEvent.ACTION_CANCEL: snapToDestination(); mTouchState = TOUCH_STATE_REST; if (handler != null) { Message message = handler.obtainMessage(0); handler.sendMessageDelayed(message, timeSpan); } } return true; }
From source file:com.gu.swiperefresh.SwipeRefreshPlush.java
@Override public boolean onInterceptTouchEvent(MotionEvent ev) { ensureTarget();/* w w w. j av a 2 s. c o m*/ final int action = MotionEventCompat.getActionMasked(ev); int pointerIndex; if (mReturningToStart && action == MotionEvent.ACTION_DOWN) { mReturningToStart = false; } if (!isEnabled() || (!canLoadMore() && !canRefresh()) || mReturningToStart || mRefreshController.isRefresh() || mNestedScrollInProgress) { // Fail fast if we're not in a state where a swipe is possible return false; } switch (action) { case MotionEvent.ACTION_DOWN: mRefreshController.setTargetOffsetTopAndBottom( mRefreshController.getCurrentTargetOffsetTop() - mRefreshView.getTop(), true); mActivePointerId = ev.getPointerId(0); mIsBeingDragUp = false; mIsBeingDragDown = false; pointerIndex = ev.findPointerIndex(mActivePointerId); if (pointerIndex < 0) { return false; } mInitialDownY = ev.getY(pointerIndex); initOrResetVelocityTracker(); mVelocityTracker.addMovement(ev); break; case MotionEvent.ACTION_MOVE: if (mActivePointerId == INVALID_POINTER) { return false; } mVelocityTracker.addMovement(ev); pointerIndex = ev.findPointerIndex(mActivePointerId); if (pointerIndex < 0) { return false; } final float y = ev.getY(pointerIndex); startDragging(y); break; case MotionEventCompat.ACTION_POINTER_UP: onSecondaryPointerUp(ev); break; case MotionEvent.ACTION_UP: final VelocityTracker velocityTracker = mVelocityTracker; velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity); float initialVelocity = velocityTracker.getYVelocity(mActivePointerId); Log.d(TAG, "fling:" + initialVelocity); if (Math.abs(initialVelocity) > mMinimumVelocity) { flingWithNestedDispatch(0, -initialVelocity); } releaseVelocityTracker(); break; case MotionEvent.ACTION_CANCEL: mIsBeingDragUp = false; mActivePointerId = INVALID_POINTER; break; } return mIsBeingDragUp || mIsBeingDragDown; }