public class View implements Drawable.Callback, KeyEvent.Callback,AccessibilityEventSource {……public interface OnClickListener {/*** Called when a view has been clicked.** @param v The view that was clicked.*/void onClick(View v);}……public interface OnTouchListener {/*** Called when a touch event is dispatched to a view. This allows listeners to* get a chance to respond before the target view.** @param v The view the touch event has been dispatched to.* @param event The MotionEvent object containing full information about*the event.* @return True if the listener has consumed the event, false otherwise.*/boolean onTouch(View v, MotionEvent event);}……public boolean dispatchTouchEvent(MotionEvent event) {if (mInputEventConsistencyVerifier != null) {mInputEventConsistencyVerifier.onTouchEvent(event, 0);}if (DBG_MOTION) {Xlog.d(VIEW_LOG_TAG, "(View)dispatchTouchEvent: event = " + event + ",this = " + this);}if (onFilterTouchEventForSecurity(event)) {//noinspection SimplifiableIfStatementListenerInfo li = mListenerInfo;if (li != null && li.mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED&& li.mOnTouchListener.onTouch(this, event)) {return true;}if (onTouchEvent(event)) {return true;}}if (mInputEventConsistencyVerifier != null) {mInputEventConsistencyVerifier.onUnhandledEvent(event, 0);}return false;}/*** Filter the touch event to apply security policies.** @param event The motion event to be filtered.* @return True if the event should be dispatched, false if the event should be dropped.** @see #getFilterTouchesWhenObscured*/public boolean onFilterTouchEventForSecurity(MotionEvent event) {//noinspection RedundantIfStatementif ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0&& (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) {// Window is obscured, drop this touch.return false;}return true;}…..public boolean onTouchEvent(MotionEvent event) {final int viewFlags = mViewFlags;if ((viewFlags & ENABLED_MASK) == DISABLED) {/// M: we need to reset the pressed state or remove prepressed callback either up or cancel event happens.final int action = event.getAction();if (action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_CANCEL) {if ((mPrivateFlags & PFLAG_PRESSED) != 0) {setPressed(false);} else if ((mPrivateFlags & PFLAG_PREPRESSED) != 0) {Xlog.d(VIEW_LOG_TAG, "View onTouch event, if view is DISABLED & PFLAG_PREPRESSED, remove callback mPrivateFlags = "+ mPrivateFlags + ", this = " + this);removeTapCallback();}}// A disabled view that is clickable still consumes the touch// events, it just doesn't respond to them.return (((viewFlags & CLICKABLE) == CLICKABLE ||(viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE));}if (mTouchDelegate != null) {if (mTouchDelegate.onTouchEvent(event)) {return true;}}if (((viewFlags & CLICKABLE) == CLICKABLE ||(viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) {switch (event.getAction()) {case MotionEvent.ACTION_UP:boolean prepressed = (mPrivateFlags & PFLAG_PREPRESSED) != 0;if (DBG_MOTION) {Xlog.d(VIEW_LOG_TAG, "(View)Touch up: prepressed = " + prepressed + ",this = " + this);}if ((mPrivateFlags & PFLAG_PRESSED) != 0 || prepressed) {// take focus if we don't have it already and we should in// touch mode.boolean focusTaken = false;if (isFocusable() && isFocusableInTouchMode() && !isFocused()) {focusTaken = requestFocus();}if (prepressed) {// The button is being released before we actually// showed it as pressed. Make it show the pressed// state now (before scheduling the click) to ensure// the user sees it.setPressed(true);}if (!mHasPerformedLongPress) {// This is a tap, so remove the longpress checkremoveLongPressCallback();// Only perform take click actions if we were in the pressed stateif (!focusTaken) {// Use a Runnable and post this rather than calling// performClick directly. This lets other visual state// of the view update before click actions start.if (mPerformClick == null) {mPerformClick = new PerformClick();}if (!post(mPerformClick)) {performClick();}}}if (mUnsetPressedState == null) {mUnsetPressedState = new UnsetPressedState();}if (prepressed) {postDelayed(mUnsetPressedState,ViewConfiguration.getPressedStateDuration());} else if (!post(mUnsetPressedState)) {// If the post failed, unpress right nowmUnsetPressedState.run();}removeTapCallback();}break;case MotionEvent.ACTION_DOWN:mHasPerformedLongPress = false;if (performButtonActionOnTouchDown(event)) {break;}// Walk up the hierarchy to determine if we're inside a scrolling container.boolean isInScrollingContainer = isInScrollingContainer();if (DBG_MOTION) {Xlog.d(VIEW_LOG_TAG, "(View)Touch down: isInScrollingContainer = "+ isInScrollingContainer + ",this = " + this);}// For views inside a scrolling container, delay the pressed feedback for// a short period in case this is a scroll.if (isInScrollingContainer) {mPrivateFlags |= PFLAG_PREPRESSED;if (mPendingCheckForTap == null) {mPendingCheckForTap = new CheckForTap();}postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout());} else {// Not inside a scrolling container, so show the feedback right awaysetPressed(true);checkForLongClick(0);}break;case MotionEvent.ACTION_CANCEL:if (DBG_MOTION) {Xlog.d(VIEW_LOG_TAG, "(View)Touch cancel: this = " + this);}setPressed(false);removeTapCallback();removeLongPressCallback();break;case MotionEvent.ACTION_MOVE:final int x = (int) event.getX();final int y = (int) event.getY();if (DBG_MOTION) {Xlog.d(VIEW_LOG_TAG, "(View)Touch move: x = " + x + ",y = " + y+ ",mTouchSlop = " + mTouchSlop + ",this = " + this);}// Be lenient about moving outside of buttonsif (!pointInView(x, y, mTouchSlop)) {// Outside buttonremoveTapCallback();if ((mPrivateFlags & PFLAG_PRESSED) != 0) {// Remove any future long press/tap checksremoveLongPressCallback();setPressed(false);}}break;}return true;}return false;}}
，流转的时光，都成为命途中美丽的点缀，
