下面列出了android.view.MotionEvent#obtain ( ) 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。
private void onLongPress() {
clearCallbacks();
final View src = mSrc;
if (!src.isEnabled()) {
return;
}
if (!onForwardingStarted()) {
return;
}
// Don't let the parent intercept our events.
mSrc.getParent().requestDisallowInterceptTouchEvent(true);
// Make sure we cancel any ongoing source event stream.
final long now = SystemClock.uptimeMillis();
final MotionEvent e = MotionEvent.obtain(now, now, MotionEvent.ACTION_CANCEL, 0, 0, 0);
mSrc.onTouchEvent(e);
e.recycle();
mForwarding = true;
mWasLongPress = true;
}
/**
* Start a fake drag of the pager.
* <p>
* <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>
* <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);
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;
}
/**
* Start a fake drag of the pager.
* <p/>
* <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/>
* <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 );
mInitialMotionX = mLastMotionX = 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;
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
if (redirectTouchesToStickyView) {
ev.offsetLocation(0,
((getScrollY() + stickyViewTopOffset) - getTopForViewRelativeOnlyChild(currentlyStickingView)));
}
if (ev.getAction() == MotionEvent.ACTION_DOWN) {
hasNotDoneActionDown = false;
}
if (hasNotDoneActionDown) {
MotionEvent down = MotionEvent.obtain(ev);
down.setAction(MotionEvent.ACTION_DOWN);
super.onTouchEvent(down);
hasNotDoneActionDown = false;
}
if (ev.getAction() == MotionEvent.ACTION_UP || ev.getAction() == MotionEvent.ACTION_CANCEL) {
hasNotDoneActionDown = true;
}
return super.onTouchEvent(ev);
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
if(redirectTouchesToStickyView){
ev.offsetLocation(0, ((getScrollY() + stickyViewTopOffset) - getTopForViewRelativeOnlyChild(currentlyStickingView)));
}
if(ev.getAction()==MotionEvent.ACTION_DOWN){
hasNotDoneActionDown = false;
}
if(hasNotDoneActionDown){
MotionEvent down = MotionEvent.obtain(ev);
down.setAction(MotionEvent.ACTION_DOWN);
super.onTouchEvent(down);
hasNotDoneActionDown = false;
}
if(ev.getAction()==MotionEvent.ACTION_UP || ev.getAction()==MotionEvent.ACTION_CANCEL){
hasNotDoneActionDown = true;
}
return super.onTouchEvent(ev);
}
@Override
protected void handleStartProgressEvent(int actionCode, MotionEvent event){
switch (actionCode) {
case MotionEvent.ACTION_DOWN:
resetState(); // In case we missed an UP/CANCEL event
mPrevEvent = MotionEvent.obtain(event);
mTimeDelta = 0;
updateStateByEvent(event);
break;
case MotionEvent.ACTION_MOVE:
mGestureInProgress = mListener.onMoveBegin(this);
break;
}
}
private boolean touchMove(int x, int y) {
final long eventTime = SystemClock.uptimeMillis();
MotionEvent event = MotionEvent.obtain(mDownTime, eventTime,
MotionEvent.ACTION_MOVE, x, y, 1.0f, 1.0f, 0, 1.0f, 1.0f,
eventId, 0);
event.setSource(InputDevice.SOURCE_TOUCHSCREEN);
return injectEventSync(event);
}
protected void sendDownEvent(MotionEvent event) {
if (mHasSendDownEvent || (event == null && mLastMoveEvent == null)) {
return;
}
if (sDebug) {
Log.d(TAG, "sendDownEvent()");
}
final MotionEvent last = event == null ? mLastMoveEvent : event;
final long now = SystemClock.uptimeMillis();
final float[] rawOffsets = mIndicator.getRawOffsets();
final MotionEvent downEv =
MotionEvent.obtain(
now,
now,
MotionEvent.ACTION_DOWN,
last.getX() - rawOffsets[0],
last.getY() - rawOffsets[1],
0);
downEv.setSource(InputDevice.SOURCE_TOUCHSCREEN);
super.dispatchTouchEvent(downEv);
downEv.recycle();
final MotionEvent moveEv =
MotionEvent.obtain(now, now, MotionEvent.ACTION_MOVE, last.getX(), last.getY(), 0);
moveEv.setSource(InputDevice.SOURCE_TOUCHSCREEN);
mHasSendCancelEvent = false;
mHasSendDownEvent = true;
super.dispatchTouchEvent(moveEv);
moveEv.recycle();
}
public void touchMove(int x, int y)
{
if(!fingerDown)
touchStart(x,y);
else
{
int realX = getRealCoord(x);
int realY = getRealCoord(y);
long downTime = SystemClock.uptimeMillis();
// event time MUST be retrieved only by this way!
long eventTime = SystemClock.uptimeMillis();
MotionEvent event = MotionEvent.obtain(downTime, eventTime, MotionEvent.ACTION_MOVE, realX, realY, 0);
inst.sendPointerSync(event);
}
}
@Override
protected void handleInProgressEvent(int actionCode, MotionEvent event){
switch (actionCode) {
case MotionEvent.ACTION_POINTER_UP:
// Gesture ended but
updateStateByEvent(event);
if (!mSloppyGesture) {
mListener.onRotateEnd(this);
}
resetState();
break;
case MotionEvent.ACTION_CANCEL:
if (!mSloppyGesture) {
mListener.onRotateEnd(this);
}
resetState();
break;
case MotionEvent.ACTION_MOVE:
updateStateByEvent(event);
// Only accept the event if our relative pressure is within
// a certain limit. This can help filter shaky data as a
// finger is lifted.
if (mCurrPressure / mPrevPressure > PRESSURE_THRESHOLD) {
final boolean updatePrevious = mListener.onRotate(this);
if (updatePrevious) {
mPrevEvent.recycle();
mPrevEvent = MotionEvent.obtain(event);
}
}
break;
}
}
private boolean handleMoveEvent(MotionEvent motionEvent) {
if (mPaused || (mVelocityTracker == null)) {
return false;
}
mVelocityTracker.addMovement(motionEvent);
float deltaX = motionEvent.getRawX() - mDownX;
float deltaY = motionEvent.getRawY() - mDownY;
if (mTouchChildTouched && !mDisallowSwipe && Math.abs(deltaX) > mSlop && Math.abs(deltaX) > Math.abs(deltaY)) {
mSwiping = true;
mListView.requestDisallowInterceptTouchEvent(true);
// Cancel ListView's touch (un-highlighting the item)
MotionEvent cancelEvent = MotionEvent.obtain(motionEvent);
cancelEvent.setAction(MotionEvent.ACTION_CANCEL | (motionEvent.getActionIndex() << MotionEvent.ACTION_POINTER_INDEX_SHIFT));
mListView.onTouchEvent(cancelEvent);
}
if (mSwiping) {
if (!mSwipeInitiated) {
Log.d("SwipeDismissListViewTouchListener", "swipe/begin");
}
mSwipeInitiated = true;
ViewHelper.setTranslationX(mCurrentDismissData.view, deltaX);
ViewHelper.setAlpha(mCurrentDismissData.view, Math.max(0f, Math.min(1f, 1f - 2f * Math.abs(deltaX) / mViewWidth)));
return true;
}
return false;
}
public void run() {
if (checkingForLongPress && getParent() != null && currentPressCount == pressCount) {
checkingForLongPress = false;
performHapticFeedback(HapticFeedbackConstants.LONG_PRESS);
if (pressedLink >= 0) {
delegate.onLinkPress(links.get(pressedLink), true);
}
MotionEvent event = MotionEvent.obtain(0, 0, MotionEvent.ACTION_CANCEL, 0, 0, 0);
onTouchEvent(event);
event.recycle();
}
}
private void forceScroll() {
MotionEvent event = MotionEvent.obtain(System.currentTimeMillis(), System.currentTimeMillis(), MotionEvent.ACTION_MOVE, 570, -1, 0);
mScrollHelper.onTouch(mListViewLeft, event);
}
/**
* Fake drag by an offset in pixels. You must have called {@link #beginFakeDrag()} first.
*
* @param yOffset Offset in pixels to drag by.
* @see #beginFakeDrag()
* @see #endFakeDrag()
*/
public void fakeDragBy(float yOffset) {
if (!mFakeDragging) {
throw new IllegalStateException("No fake drag in progress. Call beginFakeDrag first.");
}
mLastMotionY += yOffset;
float oldScrollY = getScrollY();
float scrollY = oldScrollY - yOffset;
final int height = getClientHeight();
float topBound = height * mFirstOffset;
float bottomBound = height * mLastOffset;
final ItemInfo firstItem = mItems.get(0);
final ItemInfo lastItem = mItems.get(mItems.size() - 1);
if (firstItem.position != 0) {
topBound = firstItem.offset * height;
}
if (lastItem.position != mAdapter.getCount() - 1) {
bottomBound = lastItem.offset * height;
}
if (scrollY < topBound) {
scrollY = topBound;
} else if (scrollY > bottomBound) {
scrollY = bottomBound;
}
// Don't lose the rounded component
mLastMotionY += scrollY - (int) scrollY;
scrollTo(getScrollX(), (int) scrollY);
pageScrolled((int) scrollY);
// Synthesize an event for the VelocityTracker.
final long time = SystemClock.uptimeMillis();
final MotionEvent ev = MotionEvent.obtain(mFakeDragBeginTime, time, MotionEvent.ACTION_MOVE,
0, mLastMotionY, 0);
mVelocityTracker.addMovement(ev);
ev.recycle();
}
/**
* Fake drag by an offset in pixels. You must have called {@link #beginFakeDrag()} first.
*
* @param yOffset Offset in pixels to drag by.
* @see #beginFakeDrag()
* @see #endFakeDrag()
*/
public void fakeDragBy(float yOffset) {
if (!mFakeDragging) {
throw new IllegalStateException("No fake drag in progress. Call beginFakeDrag first.");
}
mLastMotionY += yOffset;
float oldScrollY = getScrollY();
float scrollY = oldScrollY - yOffset;
final int height = getClientHeight();
float topBound = height * mFirstOffset;
float bottomBound = height * mLastOffset;
final ItemInfo firstItem = mItems.get(0);
final ItemInfo lastItem = mItems.get(mItems.size() - 1);
if (firstItem.position != 0) {
topBound = firstItem.offset * height;
}
if (lastItem.position != mAdapter.getCount() - 1) {
bottomBound = lastItem.offset * height;
}
if (scrollY < topBound) {
scrollY = topBound;
} else if (scrollY > bottomBound) {
scrollY = bottomBound;
}
// Don't lose the rounded component
mLastMotionY += scrollY - (int) scrollY;
scrollTo(getScrollX(), (int) scrollY);
pageScrolled((int) scrollY);
// Synthesize an event for the VelocityTracker.
final long time = SystemClock.uptimeMillis();
final MotionEvent ev = MotionEvent.obtain(mFakeDragBeginTime, time, MotionEvent.ACTION_MOVE,
0, mLastMotionY, 0);
mVelocityTracker.addMovement(ev);
ev.recycle();
}
/**
* Fake drag by an offset in pixels. You must have called {@link #beginFakeDrag()} first.
*
* @param xOffset Offset in pixels to drag by.
* @see #beginFakeDrag()
* @see #endFakeDrag()
*/
public void fakeDragBy(float xOffset) {
if (!mFakeDragging) {
throw new IllegalStateException("No fake drag in progress. Call beginFakeDrag first.");
}
if (mAdapter == null) {
return;
}
mLastMotionX += xOffset;
float oldScrollX = getScrollX();
float scrollX = oldScrollX - xOffset;
final int width = getClientWidth();
float leftBound = width * mFirstOffset;
float rightBound = width * mLastOffset;
final CoolViewPager.ItemInfo firstItem = mItems.get(0);
final CoolViewPager.ItemInfo lastItem = mItems.get(mItems.size() - 1);
if (firstItem.position != 0) {
leftBound = firstItem.offset * width;
}
if (lastItem.position != mAdapter.getCount() - 1) {
rightBound = lastItem.offset * width;
}
if (scrollX < leftBound) {
scrollX = leftBound;
} else if (scrollX > rightBound) {
scrollX = rightBound;
}
// Don't lose the rounded component
mLastMotionX += scrollX - (int) scrollX;
scrollTo((int) scrollX, getScrollY());
pageScrolled((int) scrollX);
// Synthesize an event for the VelocityTracker.
final long time = SystemClock.uptimeMillis();
final MotionEvent ev = MotionEvent.obtain(mFakeDragBeginTime, time, MotionEvent.ACTION_MOVE,
mLastMotionX, 0, 0);
mVelocityTracker.addMovement(ev);
ev.recycle();
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
boolean handled = false;
boolean cancelSuper = false;
MotionEvent cancelEvent = null;
final int action = MotionEventCompat.getActionMasked(ev);
if (mBehaviorTouchView != null || (cancelSuper = performIntercept(ev, TYPE_ON_TOUCH))) {
// Safe since performIntercept guarantees that
// mBehaviorTouchView != null if it returns true
final LayoutParams lp = (LayoutParams) mBehaviorTouchView.getLayoutParams();
final Behavior b = lp.getBehavior();
if (b != null) {
handled = b.onTouchEvent(this, mBehaviorTouchView, ev);
}
}
// Keep the super implementation correct
if (mBehaviorTouchView == null) {
handled |= super.onTouchEvent(ev);
} else if (cancelSuper) {
if (cancelEvent == null) {
final long now = SystemClock.uptimeMillis();
cancelEvent = MotionEvent.obtain(now, now,
MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0);
}
super.onTouchEvent(cancelEvent);
}
if (!handled && action == MotionEvent.ACTION_DOWN) {
}
if (cancelEvent != null) {
cancelEvent.recycle();
}
if (action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_CANCEL) {
resetTouchBehaviors();
}
return handled;
}
private boolean detectNestedScroll(MotionEvent e) {
final MotionEvent vtev = MotionEvent.obtain(e);
final int action = MotionEventCompat.getActionMasked(e);
final int actionIndex = MotionEventCompat.getActionIndex(e);
if (action == MotionEvent.ACTION_DOWN) {
mNestedOffsets[0] = mNestedOffsets[1] = 0;
}
vtev.offsetLocation(mNestedOffsets[0], mNestedOffsets[1]);
switch (action) {
case MotionEvent.ACTION_DOWN:
mActivePointerId = e.getPointerId(0);
mLastTouchX = (int) e.getX();
mLastTouchY = (int) e.getY();
startNestedScroll(ViewCompat.SCROLL_AXIS_VERTICAL);
break;
case MotionEventCompat.ACTION_POINTER_DOWN:
mActivePointerId = e.getPointerId(actionIndex);
mLastTouchX = (int) e.getX(actionIndex);
mLastTouchY = (int) e.getY(actionIndex);
break;
case MotionEvent.ACTION_MOVE:
final int index = e.findPointerIndex(mActivePointerId);
if (index < 0) {
Log.e("TwinklingRefreshLayout", "Error processing scroll; pointer index for id " +
mActivePointerId + " not found. Did any MotionEvents get skipped?");
return false;
}
final int x = (int) e.getX(index);
final int y = (int) e.getY(index);
int dx = mLastTouchX - x;
int dy = mLastTouchY - y;
if (dispatchNestedPreScroll(dx, dy, mScrollConsumed, mScrollOffset)) {
dx -= mScrollConsumed[0];
dy -= mScrollConsumed[1];
vtev.offsetLocation(mScrollOffset[0], mScrollOffset[1]);
// Updated the nested offsets
mNestedOffsets[0] += mScrollOffset[0];
mNestedOffsets[1] += mScrollOffset[1];
}
if (!mIsBeingDragged && Math.abs(dy) > mTouchSlop) {
final ViewParent parent = getParent();
if (parent != null) {
parent.requestDisallowInterceptTouchEvent(true);
}
mIsBeingDragged = true;
if (dy > 0) {
dy -= mTouchSlop;
} else {
dy += mTouchSlop;
}
}
if (mIsBeingDragged) {
mLastTouchY = y - mScrollOffset[1];
final int scrolledDeltaY = 0;
final int unconsumedY = dy - scrolledDeltaY;
if (dispatchNestedScroll(0, scrolledDeltaY, 0, unconsumedY, mScrollOffset)) {
mLastTouchX -= mScrollOffset[0];
mLastTouchY -= mScrollOffset[1];
vtev.offsetLocation(mScrollOffset[0], mScrollOffset[1]);
mNestedOffsets[0] += mScrollOffset[0];
mNestedOffsets[1] += mScrollOffset[1];
}
}
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
stopNestedScroll();
mIsBeingDragged = false;
mActivePointerId = INVALID_POINTER;
break;
}
vtev.recycle();
return true;
}
/**
* Fake drawable_drag by an offset in pixels. You must have called {@link #beginFakeDrag()} first.
*
* @param xOffset Offset in pixels to drawable_drag by.
* @see #beginFakeDrag()
* @see #endFakeDrag()
*/
public void fakeDragBy(float xOffset) {
if (!mFakeDragging) {
throw new IllegalStateException("No fake drawable_drag in progress. Call beginFakeDrag first.");
}
mLastMotionX += xOffset;
float oldScrollX = getScrollX();
float scrollX = oldScrollX - xOffset;
final int width = getClientWidth();
float leftBound = width * mFirstOffset;
float rightBound = width * mLastOffset;
final ItemInfo firstItem = mItems.get(0);
final ItemInfo lastItem = mItems.get(mItems.size() - 1);
if (firstItem.position != 0) {
leftBound = firstItem.offset * width;
}
if (lastItem.position != mAdapter.getCount() - 1) {
rightBound = lastItem.offset * width;
}
if (scrollX < leftBound) {
scrollX = leftBound;
} else if (scrollX > rightBound) {
scrollX = rightBound;
}
// Don't lose the rounded component
mLastMotionX += scrollX - (int) scrollX;
scrollTo((int) scrollX, getScrollY());
pageScrolled((int) scrollX);
// Synthesize an event for the VelocityTracker.
final long time = SystemClock.uptimeMillis();
final MotionEvent ev = MotionEvent.obtain(mFakeDragBeginTime, time, MotionEvent.ACTION_MOVE,
mLastMotionX, 0, 0);
mVelocityTracker.addMovement(ev);
ev.recycle();
}
/**
* Fake drag by an offset in pixels. You must have called {@link #beginFakeDrag()} first.
*
* @param xOffset Offset in pixels to drag by.
* @see #beginFakeDrag()
* @see #endFakeDrag()
*/
public void fakeDragBy(float xOffset) {
if (!mFakeDragging) {
throw new IllegalStateException("No fake drag in progress. Call beginFakeDrag first.");
}
mLastMotionX += xOffset;
float oldScrollX = getScrollX();
float scrollX = oldScrollX - xOffset;
final int width = getClientWidth();
float leftBound = width * mFirstOffset;
float rightBound = width * mLastOffset;
final ItemInfo firstItem = mItems.get(0);
final ItemInfo lastItem = mItems.get(mItems.size() - 1);
if (firstItem.position != 0) {
leftBound = firstItem.offset * width;
}
if (lastItem.position != mAdapter.getCount() - 1) {
rightBound = lastItem.offset * width;
}
if (scrollX < leftBound) {
scrollX = leftBound;
} else if (scrollX > rightBound) {
scrollX = rightBound;
}
// Don't lose the rounded component
mLastMotionX += scrollX - (int) scrollX;
scrollTo((int) scrollX, getScrollY());
pageScrolled((int) scrollX);
// Synthesize an event for the VelocityTracker.
final long time = SystemClock.uptimeMillis();
final MotionEvent ev = MotionEvent.obtain(mFakeDragBeginTime, time, MotionEvent.ACTION_MOVE,
mLastMotionX, 0, 0);
mVelocityTracker.addMovement(ev);
ev.recycle();
}