下面列出了android.view.MotionEvent#INVALID_POINTER_ID 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 int findIndex(int pointerId) {
for (int i = 0; i < mDownPointers; i++) {
if (mDownPointerId[i] == pointerId) {
return i;
}
}
if (mDownPointers == MAX_TRACKED_POINTERS || pointerId == MotionEvent.INVALID_POINTER_ID) {
return UNTRACKED_POINTER;
}
mDownPointerId[mDownPointers++] = pointerId;
return mDownPointers - 1;
}
@Override
public void onViewDetachedFromWindow(View v) {
mForwarding = false;
mActivePointerId = MotionEvent.INVALID_POINTER_ID;
if (mDisallowIntercept != null) {
mSrc.removeCallbacks(mDisallowIntercept);
}
}
/**
* Resets the component to the initial state.
*/
@TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
public void reset() {
mGestureInProgress = false;
mCount = 0;
for (int i = 0; i < MAX_POINTERS; i++) {
mId[i] = Build.VERSION.SDK_INT < Build.VERSION_CODES.ICE_CREAM_SANDWICH ?
-1 : MotionEvent.INVALID_POINTER_ID;
}
}
/**
* Resets the component to the initial state.
*/
public void reset() {
mGestureInProgress = false;
mPointerCount = 0;
for (int i = 0; i < MAX_POINTERS; i++) {
mId[i] = MotionEvent.INVALID_POINTER_ID;
}
}
private void updatePointersOnTap(MotionEvent event) {
mPointerCount = 0;
for (int i = 0; i < MAX_POINTERS; i++) {
int index = getPressedPointerIndex(event, i);
if (index == -1) {
mId[i] = MotionEvent.INVALID_POINTER_ID;
} else {
mId[i] = event.getPointerId(index);
mCurrentX[i] = mStartX[i] = event.getX(index);
mCurrentY[i] = mStartY[i] = event.getY(index);
mPointerCount++;
}
}
}
private int findIndex(int pointerId) {
for (int i = 0; i < mDownPointers; i++) {
if (mDownPointerId[i] == pointerId) {
return i;
}
}
if (mDownPointers == MAX_TRACKED_POINTERS || pointerId == MotionEvent.INVALID_POINTER_ID) {
return UNTRACKED_POINTER;
}
mDownPointerId[mDownPointers++] = pointerId;
return mDownPointers - 1;
}
/**
* Resets the component to the initial state.
*/
@TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
public void reset() {
mGestureInProgress = false;
mCount = 0;
for (int i = 0; i < MAX_POINTERS; i++) {
mId[i] = Build.VERSION.SDK_INT < Build.VERSION_CODES.ICE_CREAM_SANDWICH ?
-1 : MotionEvent.INVALID_POINTER_ID;
}
}
/**
* Resets the component to the initial state.
*/
public void reset() {
mGestureInProgress = false;
mCount = 0;
for (int i = 0; i < MAX_POINTERS; i++) {
mId[i] = MotionEvent.INVALID_POINTER_ID;
}
}
/**
* Resets the component to the initial state.
*/
public void reset() {
mGestureInProgress = false;
mCount = 0;
for (int i = 0; i < MAX_POINTERS; i++) {
mId[i] = MotionEvent.INVALID_POINTER_ID;
}
}
/**
* Resets the component to the initial state.
*/
@TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
public void reset() {
mGestureInProgress = false;
mCount = 0;
for (int i = 0; i < MAX_POINTERS; i++) {
mId[i] = Build.VERSION.SDK_INT < Build.VERSION_CODES.ICE_CREAM_SANDWICH ?
-1 : MotionEvent.INVALID_POINTER_ID;
}
}
/** Resets the component to the initial state. */
public void reset() {
mGestureInProgress = false;
mPointerCount = 0;
for (int i = 0; i < MAX_POINTERS; i++) {
mId[i] = MotionEvent.INVALID_POINTER_ID;
}
}
private void updatePointersOnTap(MotionEvent event) {
mPointerCount = 0;
for (int i = 0; i < MAX_POINTERS; i++) {
int index = getPressedPointerIndex(event, i);
if (index == -1) {
mId[i] = MotionEvent.INVALID_POINTER_ID;
} else {
mId[i] = event.getPointerId(index);
mCurrentX[i] = mStartX[i] = event.getX(index);
mCurrentY[i] = mStartY[i] = event.getY(index);
mPointerCount++;
}
}
}
private void resetTouch() {
mActivePointerId = MotionEvent.INVALID_POINTER_ID;
mIsDragging = false;
mOpenOnClick = false;
mInitialTouchX = mInitialTouchY = mLastTouchY = 0;
mVelocityTracker.clear();
}
@Override
public void onViewDetachedFromWindow(View v) {
mForwarding = false;
mActivePointerId = MotionEvent.INVALID_POINTER_ID;
if (mDisallowIntercept != null) {
mSrc.removeCallbacks(mDisallowIntercept);
}
}
@Override
public boolean onInterceptTouchEvent(CoordinatorLayout parent, V child, MotionEvent event) {
if (!child.isShown()) {
ignoreEvents = true;
return false;
}
int action = event.getActionMasked();
// Record the velocity
if (action == MotionEvent.ACTION_DOWN) {
reset();
}
if (velocityTracker == null) {
velocityTracker = VelocityTracker.obtain();
}
velocityTracker.addMovement(event);
switch (action) {
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
touchingScrollingChild = false;
activePointerId = MotionEvent.INVALID_POINTER_ID;
// Reset the ignore flag
if (ignoreEvents) {
ignoreEvents = false;
return false;
}
break;
case MotionEvent.ACTION_DOWN:
int initialX = (int) event.getX();
initialY = (int) event.getY();
// Only intercept nested scrolling events here if the view not being moved by the
// ViewDragHelper.
if (mNestedScrollingChildRefList != null) {
for (View childView : mNestedScrollingChildRefList) {
if (childView != null && parent.isPointInChildBounds(childView, initialX, initialY)) {
activePointerId = event.getPointerId(event.getActionIndex());
touchingScrollingChild = true;
}
}
}
ignoreEvents =
activePointerId == MotionEvent.INVALID_POINTER_ID
&& !parent.isPointInChildBounds(child, initialX, initialY);
break;
default: // fall out
}
if (!ignoreEvents
&& viewDragHelper != null
&& viewDragHelper.shouldInterceptTouchEvent(event)) {
return true;
}
// We have to handle cases that the ViewDragHelper does not capture the bottom sheet because
// it is not the top most view of its parent. This is not necessary when the touch event is
// happening over the scrolling content as nested scrolling logic handles that case.
//View scroll = nestedScrollingChildRef != null ? nestedScrollingChildRef.get() : null;
return action == MotionEvent.ACTION_MOVE
&& !ignoreEvents
&& state != STATE_DRAGGING
&& !isPointInsideChildScrollView(parent, (int) event.getX(), (int) event.getY())
&& viewDragHelper != null
&& Math.abs(initialY - event.getY()) > viewDragHelper.getTouchSlop();
}
@Override
public boolean onTouch(View v, MotionEvent event) {
if (null != mAnimator && mAnimator.isRunning()) return false;
if (null == mPopupWindow) return false;
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
LayoutParams params = mPopupWindow.getWindowParams();
aPID = event.getPointerId(0);
downX = (int) (params.x - event.getRawX());
downY = (int) (params.y - event.getRawY());
break;
case MotionEvent.ACTION_UP:
// Handle "snapping" to the right/ left edge of the screen.
if (null != mAnchor) {
final Rect mBounds = mPopupWindow.getBounds();
final int[] screen = mPopupWindow.getWindowDimensions();
switch (mAnchor) {
case AXIS_Y:
if (mBounds.left + (mBounds.width() / 2) > (screen[0] / 2)) { // Snap right.
snap(screen[0] - mBounds.width(), PopupWindow.POSITION_UNCHANGED);
} else { // Snap left.
snap(0, PopupWindow.POSITION_UNCHANGED);
}
break;
case AXIS_X:
if (mBounds.top + (mBounds.height() / 2) > (screen[1] / 2)) { // Snap bottom.
snap(PopupWindow.POSITION_UNCHANGED, screen[1] - mBounds.height());
} else { // Snap top.
snap(PopupWindow.POSITION_UNCHANGED, 0);
}
break;
case EDGES:
if (mBounds.top + (mBounds.height() / 2) > (screen[1] / 2)) { // Snap bottom half.
if (mBounds.left + (mBounds.width() / 2) > (screen[0] / 2)) // Snap bottom right.
snap(screen[0] - mBounds.width(), screen[1] - mBounds.height());
else // Snap bottom left.
snap(0, screen[1] - mBounds.height());
} else { // Snap top half.
if (mBounds.left + (mBounds.width() / 2) > (screen[0] / 2)) // Snap top right.
snap(screen[0] - mBounds.width(), 0);
else // Snap top left.
snap(0, 0);
}
break;
}
}
break;
case MotionEvent.ACTION_POINTER_UP:
// Extract the index of the pointer that left the touch sensor
final int pointerIndex = (event.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK) >> MotionEvent.ACTION_POINTER_INDEX_SHIFT;
final int pointerId = event.getPointerId(pointerIndex);
if (pointerId == aPID) {
// This was our active pointer going up. Choose a new
// active pointer and adjust accordingly.
final int newPointerIndex = (pointerIndex == 0) ? 1 : 0;
aPID = event.getPointerId(newPointerIndex);
}
case MotionEvent.ACTION_MOVE:
// Find the index of the active pointer and fetch its position
final int mPID = event.findPointerIndex(aPID);
float xMove = event.getRawX();
float yMove = event.getRawY();
// From http://android-developers.blogspot.com/2010/06/making-sense-of-multitouch.html
final int dx = (int) (xMove + downX);
final int dy = (int) (yMove + downY);
mPopupWindow.position(((lockX) ? PopupWindow.POSITION_UNCHANGED : dx),
((lockY) ? PopupWindow.POSITION_UNCHANGED : dy));
break;
case MotionEvent.ACTION_CANCEL:
aPID = MotionEvent.INVALID_POINTER_ID;
break;
}
return true;
}
@Override
public boolean onTouch(View v, MotionEvent event) {
if (null != mAnimator && mAnimator.isRunning()) return false;
if (null == mPopupWindow) return false;
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
LayoutParams params = mPopupWindow.getWindowParams();
aPID = event.getPointerId(0);
downX = (int) (params.x - event.getRawX());
downY = (int) (params.y - event.getRawY());
break;
case MotionEvent.ACTION_UP:
// Handle "snapping" to the right/ left edge of the screen.
if (null != mAnchor) {
final Rect mBounds = mPopupWindow.getBounds();
final int[] screen = mPopupWindow.getWindowDimensions();
switch (mAnchor) {
case AXIS_Y:
if (mBounds.left + (mBounds.width() / 2) > (screen[0] / 2)) { // Snap right.
snap(screen[0] - mBounds.width(), PopupWindow.POSITION_UNCHANGED);
} else { // Snap left.
snap(0, PopupWindow.POSITION_UNCHANGED);
}
break;
case AXIS_X:
if (mBounds.top + (mBounds.height() / 2) > (screen[1] / 2)) { // Snap bottom.
snap(PopupWindow.POSITION_UNCHANGED, screen[1] - mBounds.height());
} else { // Snap top.
snap(PopupWindow.POSITION_UNCHANGED, 0);
}
break;
case EDGES:
if (mBounds.top + (mBounds.height() / 2) > (screen[1] / 2)) { // Snap bottom half.
if (mBounds.left + (mBounds.width() / 2) > (screen[0] / 2)) // Snap bottom right.
snap(screen[0] - mBounds.width(), screen[1] - mBounds.height());
else // Snap bottom left.
snap(0, screen[1] - mBounds.height());
} else { // Snap top half.
if (mBounds.left + (mBounds.width() / 2) > (screen[0] / 2)) // Snap top right.
snap(screen[0] - mBounds.width(), 0);
else // Snap top left.
snap(0, 0);
}
break;
}
}
break;
case MotionEvent.ACTION_POINTER_UP:
// Extract the index of the pointer that left the touch sensor
final int pointerIndex = (event.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK) >> MotionEvent.ACTION_POINTER_INDEX_SHIFT;
final int pointerId = event.getPointerId(pointerIndex);
if (pointerId == aPID) {
// This was our active pointer going up. Choose a new
// active pointer and adjust accordingly.
final int newPointerIndex = (pointerIndex == 0) ? 1 : 0;
aPID = event.getPointerId(newPointerIndex);
}
case MotionEvent.ACTION_MOVE:
// Find the index of the active pointer and fetch its position
final int mPID = event.findPointerIndex(aPID);
float xMove = event.getRawX();
float yMove = event.getRawY();
// From http://android-developers.blogspot.com/2010/06/making-sense-of-multitouch.html
final int dx = (int) (xMove + downX);
final int dy = (int) (yMove + downY);
mPopupWindow.position(((lockX) ? PopupWindow.POSITION_UNCHANGED : dx),
((lockY) ? PopupWindow.POSITION_UNCHANGED : dy));
break;
case MotionEvent.ACTION_CANCEL:
aPID = MotionEvent.INVALID_POINTER_ID;
break;
}
return true;
}