1. Event distribution of View
process
- dispatchTouchEvent():
- OnTouchListener — – > the onTouch method
- onTouchEvent
- An onClickListener — – > the onClick method
ListenerInfo
static class ListenerInfo {
/**
* Listener used to dispatch focus change events.
* This field should be made private, so it is hidden from the SDK.
* {@hide} * /
protected OnFocusChangeListener mOnFocusChangeListener;
/** * Listeners for layout change events. */
private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners;
protected OnScrollChangeListener mOnScrollChangeListener;
/** * Listeners for attach events. */
private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners;
/**
* Listener used to dispatch click events.
* This field should be made private, so it is hidden from the SDK.
* {@hide} * /
public OnClickListener mOnClickListener;
/**
* Listener used to dispatch long click events.
* This field should be made private, so it is hidden from the SDK.
* {@hide} * /
protected OnLongClickListener mOnLongClickListener;
/**
* Listener used to dispatch context click events. This field should be made private, so it
* is hidden from the SDK.
* {@hide} * /
protected OnContextClickListener mOnContextClickListener;
/**
* Listener used to build the context menu.
* This field should be made private, so it is hidden from the SDK.
* {@hide} * /
protected OnCreateContextMenuListener mOnCreateContextMenuListener;
private OnKeyListener mOnKeyListener;
private OnTouchListener mOnTouchListener;
private OnHoverListener mOnHoverListener;
private OnGenericMotionListener mOnGenericMotionListener;
private OnDragListener mOnDragListener;
private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener;
OnApplyWindowInsetsListener mOnApplyWindowInsetsListener;
OnCapturedPointerListener mOnCapturedPointerListener;
}
Copy the codedispatchTouchEvent
public boolean dispatchTouchEvent(MotionEvent event) {
// If the event should be handled by accessibility focus first.
if (event.isTargetAccessibilityFocus()) {
// We don't have focus or no virtual descendant has it, do not handle the event.
if(! isAccessibilityFocusedViewOrHost()) {return false;
}
// We have focus and got the event, then use normal event dispatch.
event.setTargetAccessibilityFocus(false);
}
boolean result = false;
if(mInputEventConsistencyVerifier ! =null) {
mInputEventConsistencyVerifier.onTouchEvent(event, 0);
}
final int actionMasked = event.getActionMasked();
if (actionMasked == MotionEvent.ACTION_DOWN) {
// Defensive cleanup for new gesture
stopNestedScroll();
}
if (onFilterTouchEventForSecurity(event)) {
if ((mViewFlags & ENABLED_MASK) == ENABLED && handleScrollBarDragging(event)) {
result = true;
}
//noinspection SimplifiableIfStatement
ListenerInfo li = mListenerInfo;
if(li ! =null&& li.mOnTouchListener ! =null
&& (mViewFlags & ENABLED_MASK) == ENABLED
&& li.mOnTouchListener.onTouch(this, event)) {
result = true;
}
if(! result && onTouchEvent(event)) { result =true; }}if(! result && mInputEventConsistencyVerifier ! =null) {
mInputEventConsistencyVerifier.onUnhandledEvent(event, 0);
}
// Clean up after nested scrolls if this is the end of a gesture;
// also cancel it if we tried an ACTION_DOWN but we didn't want the rest
// of the gesture.
if(actionMasked == MotionEvent.ACTION_UP || actionMasked == MotionEvent.ACTION_CANCEL || (actionMasked == MotionEvent.ACTION_DOWN && ! result)) { stopNestedScroll(); }return result;
}
Copy the codeonTouchEvent
/**
* Implement this method to handle touch screen motion events.
* <p>
* If this method is used to detect click actions, it is recommended that
* the actions be performed by implementing and calling
* {@link #performClick()}. This will ensure consistent system behavior,
* including:
* <ul>
* <li>obeying click sound preferences
* <li>dispatching OnClickListener calls
* <li>handling {@link AccessibilityNodeInfo#ACTION_CLICK ACTION_CLICK} when
* accessibility features are enabled
* </ul>
*
* @param event The motion event.
* @return True if the event was handled, false otherwise.
*/
public boolean onTouchEvent(MotionEvent event) {
final float x = event.getX();
final float y = event.getY();
final int viewFlags = mViewFlags;
final int action = event.getAction();
final boolean clickable = ((viewFlags & CLICKABLE) == CLICKABLE
|| (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)
|| (viewFlags & CONTEXT_CLICKABLE) == CONTEXT_CLICKABLE;
if ((viewFlags & ENABLED_MASK) == DISABLED) {
if(action == MotionEvent.ACTION_UP && (mPrivateFlags & PFLAG_PRESSED) ! =0) {
setPressed(false);
}
mPrivateFlags3 &= ~PFLAG3_FINGER_DOWN;
// A disabled view that is clickable still consumes the touch
// events, it just doesn't respond to them.
return clickable;
}
if(mTouchDelegate ! =null) {
if (mTouchDelegate.onTouchEvent(event)) {
return true; }}if (clickable || (viewFlags & TOOLTIP) == TOOLTIP) {
switch (action) {
case MotionEvent.ACTION_UP:
mPrivateFlags3 &= ~PFLAG3_FINGER_DOWN;
if ((viewFlags & TOOLTIP) == TOOLTIP) {
handleTooltipUp();
}
if(! clickable) { removeTapCallback(); removeLongPressCallback(); mInContextButtonPress =false;
mHasPerformedLongPress = false;
mIgnoreNextUpEvent = false;
break;
}
booleanprepressed = (mPrivateFlags & PFLAG_PREPRESSED) ! =0;
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, x, y);
}
if(! mHasPerformedLongPress && ! mIgnoreNextUpEvent) {// This is a tap, so remove the longpress check
removeLongPressCallback();
// Only perform take click actions if we were in the pressed state
if(! 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 now
mUnsetPressedState.run();
}
removeTapCallback();
}
mIgnoreNextUpEvent = false;
break;
case MotionEvent.ACTION_DOWN:
if (event.getSource() == InputDevice.SOURCE_TOUCHSCREEN) {
mPrivateFlags3 |= PFLAG3_FINGER_DOWN;
}
mHasPerformedLongPress = false;
if(! clickable) { checkForLongClick(0, x, y);
break;
}
if (performButtonActionOnTouchDown(event)) {
break;
}
// Walk up the hierarchy to determine if we're inside a scrolling container.
boolean isInScrollingContainer = isInScrollingContainer();
// 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();
}
mPendingCheckForTap.x = event.getX();
mPendingCheckForTap.y = event.getY();
postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout());
} else {
// Not inside a scrolling container, so show the feedback right away
setPressed(true, x, y);
checkForLongClick(0, x, y);
}
break;
case MotionEvent.ACTION_CANCEL:
if (clickable) {
setPressed(false);
}
removeTapCallback();
removeLongPressCallback();
mInContextButtonPress = false;
mHasPerformedLongPress = false;
mIgnoreNextUpEvent = false;
mPrivateFlags3 &= ~PFLAG3_FINGER_DOWN;
break;
case MotionEvent.ACTION_MOVE:
if (clickable) {
drawableHotspotChanged(x, y);
}
// Be lenient about moving outside of buttons
if(! pointInView(x, y, mTouchSlop)) {// Outside button
// Remove any future long press/tap checks
removeTapCallback();
removeLongPressCallback();
if((mPrivateFlags & PFLAG_PRESSED) ! =0) {
setPressed(false);
}
mPrivateFlags3 &= ~PFLAG3_FINGER_DOWN;
}
break;
}
return true;
}
return false;
}
Copy the codeperformClick
/**
* Call this view's OnClickListener, if it is defined. Performs all normal
* actions associated with clicking: reporting accessibility event, playing
* a sound, etc.
*
* @return True there was an assigned OnClickListener that was called, false
* otherwise is returned.
*/
public boolean performClick(a) {
final boolean result;
final ListenerInfo li = mListenerInfo;
if(li ! =null&& li.mOnClickListener ! =null) {
playSoundEffect(SoundEffectConstants.CLICK);
li.mOnClickListener.onClick(this);
result = true;
} else {
result = false;
}
sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED);
notifyEnterOrExitForAutoFillIfNeeded(true);
return result;
}
Copy the code天安门事件
public class MyButton extends android.support.v7.widget.AppCompatButton { public MyButton(Context context) { super(context); } public MyButton(Context context, AttributeSet attrs) { super(context, attrs); } @Override public boolean dispatchTouchEvent(MotionEvent event) { Log.i("kpioneer", "dispatchTouchEvent:action--" + event.getAction()); return super.dispatchTouchEvent(event); } @Override public boolean onTouchEvent(MotionEvent event) { Log.i("kpioneer", "onTouchEvent:action--" + event.getAction()); return super.onTouchEvent(event); }}Copy the codeimport android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.RelativeLayout;
/** * Created by Xionghu on 2018/6/5. * Desc: */
public class MainActivity extends Activity implements View.OnTouchListener.View.OnClickListener {
private Button button1;
private RelativeLayout layout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button1 = (Button)findViewById(R.id.button1);
layout = (RelativeLayout)findViewById(R.id.layout);
layout.setOnTouchListener(this);
button1.setOnTouchListener(this);
layout.setOnClickListener(this);
button1.setOnClickListener(this);
}
@Override
public boolean onTouch(View v, MotionEvent event) {
Log.i("kpioneer"."OnTouchListener:acton--"+event.getAction()+"----view:"+v);
return false;
}
@Override
public void onClick(View v) {
Log.i("kpioneer"."OnClickListener----view:"+v); }}Copy the code<? xml version="1.0" encoding="utf-8"? > <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/layout"
>
<com.haocai.eventdemo.MyButton
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="14dp"
android:text="Button" />
</RelativeLayout>
Copy the codeConclusion:
- Control Listener events are triggered in the order onTouch followed by onClick
- Control onTouch returns true, making the onClick event null – preventing the event from being delivered. Return false to pass the onClick event.
- If the onTouch method of onTouchListener returns true, the onTouchEvent in the View will not be called. Order dispatchTouchEvent – > onTouchListener return false – – > onTouchEvent
- If the view is disenable, the onTouchListener will not execute, but the onTouchEvent(event) method will
- OnTouchEvent triggers an onClick event in the ACTION_UP branch of onTouchListener–>onTouch returns true, consuming the event. OnTouchListener –>onTouch returns false and does not consume this event
2. Event distribution of ViewGroup+View
ViewGroup inherited the View
- dispatchTouchEvent()
- OnInterceptTouchEvent () (intercepting touches, ViewGroup only)
- onTouchEvent()
dispatchTouchEvent
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
if(mInputEventConsistencyVerifier ! =null) {
mInputEventConsistencyVerifier.onTouchEvent(ev, 1);
}
// If the event targets the accessibility focused view and this is it, start
// normal event dispatch. Maybe a descendant is what will handle the click.
if (ev.isTargetAccessibilityFocus() && isAccessibilityFocusedViewOrHost()) {
ev.setTargetAccessibilityFocus(false);
}
boolean handled = false;
if (onFilterTouchEventForSecurity(ev)) {
final int action = ev.getAction();
final int actionMasked = action & MotionEvent.ACTION_MASK;
// Handle an initial down.
if (actionMasked == MotionEvent.ACTION_DOWN) {
// Throw away all previous state when starting a new touch gesture.
// The framework may have dropped the up or cancel event for the previous gesture
// due to an app switch, ANR, or some other state change.
cancelAndClearTouchTargets(ev);
resetTouchState();
}
// Check for interception.
final boolean intercepted;
if(actionMasked == MotionEvent.ACTION_DOWN || mFirstTouchTarget ! =null) {
final booleandisallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) ! =0;
if(! disallowIntercept) { intercepted = onInterceptTouchEvent(ev); ev.setAction(action);// restore action in case it was changed
} else {
intercepted = false; }}else {
// There are no touch targets and this action is not an initial down
// so this view group continues to intercept touches.
intercepted = true;
}
// If intercepted, start normal event dispatch. Also if there is already
// a view that is handling the gesture, do normal event dispatch.
if(intercepted || mFirstTouchTarget ! =null) {
ev.setTargetAccessibilityFocus(false);
}
// Check for cancelation.
final boolean canceled = resetCancelNextUpFlag(this)
|| actionMasked == MotionEvent.ACTION_CANCEL;
// Update list of touch targets for pointer down, if needed.
final booleansplit = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) ! =0;
TouchTarget newTouchTarget = null;
boolean alreadyDispatchedToNewTouchTarget = false;
if(! canceled && ! intercepted) {// If the event is targeting accessiiblity focus we give it to the
// view that has accessibility focus and if it does not handle it
// we clear the flag and dispatch the event to all children as usual.
// We are looking up the accessibility focused host to avoid keeping
// state since these events are very rare.
View childWithAccessibilityFocus = ev.isTargetAccessibilityFocus()
? findChildWithAccessibilityFocus() : null;
if (actionMasked == MotionEvent.ACTION_DOWN
|| (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN)
|| actionMasked == MotionEvent.ACTION_HOVER_MOVE) {
final int actionIndex = ev.getActionIndex(); // always 0 for down
final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex)
: TouchTarget.ALL_POINTER_IDS;
// Clean up earlier touch targets for this pointer id in case they
// have become out of sync.
removePointersFromTouchTargets(idBitsToAssign);
final int childrenCount = mChildrenCount;
if (newTouchTarget == null&& childrenCount ! =0) {
final float x = ev.getX(actionIndex);
final float y = ev.getY(actionIndex);
// Find a child that can receive the event.
// Scan children from front to back.
final ArrayList<View> preorderedList = buildTouchDispatchChildList();
final boolean customOrder = preorderedList == null
&& isChildrenDrawingOrderEnabled();
final View[] children = mChildren;
for (int i = childrenCount - 1; i >= 0; i--) {
final int childIndex = getAndVerifyPreorderedIndex(
childrenCount, i, customOrder);
final View child = getAndVerifyPreorderedView(
preorderedList, children, childIndex);
// If there is a view that has accessibility focus we want it
// to get the event first and if not handled we will perform a
// normal dispatch. We may do a double iteration but this is
// safer given the timeframe.
if(childWithAccessibilityFocus ! =null) {
if(childWithAccessibilityFocus ! = child) {continue;
}
childWithAccessibilityFocus = null;
i = childrenCount - 1;
}
if(! canViewReceivePointerEvents(child) || ! isTransformedTouchPointInView(x, y, child,null)) {
ev.setTargetAccessibilityFocus(false);
continue;
}
newTouchTarget = getTouchTarget(child);
if(newTouchTarget ! =null) {
// Child is already receiving touch within its bounds.
// Give it the new pointer in addition to the ones it is handling.
newTouchTarget.pointerIdBits |= idBitsToAssign;
break;
}
resetCancelNextUpFlag(child);
if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) {
// Child wants to receive touch within its bounds.
mLastTouchDownTime = ev.getDownTime();
if(preorderedList ! =null) {
// childIndex points into presorted list, find original index
for (int j = 0; j < childrenCount; j++) {
if (children[childIndex] == mChildren[j]) {
mLastTouchDownIndex = j;
break; }}}else {
mLastTouchDownIndex = childIndex;
}
mLastTouchDownX = ev.getX();
mLastTouchDownY = ev.getY();
newTouchTarget = addTouchTarget(child, idBitsToAssign);
alreadyDispatchedToNewTouchTarget = true;
break;
}
// The accessibility focus didn't handle the event, so clear
// the flag and do a normal dispatch to all children.
ev.setTargetAccessibilityFocus(false);
}
if(preorderedList ! =null) preorderedList.clear();
}
if (newTouchTarget == null&& mFirstTouchTarget ! =null) {
// Did not find a child to receive the event.
// Assign the pointer to the least recently added target.
newTouchTarget = mFirstTouchTarget;
while(newTouchTarget.next ! =null) { newTouchTarget = newTouchTarget.next; } newTouchTarget.pointerIdBits |= idBitsToAssign; }}}// Dispatch to touch targets.
if (mFirstTouchTarget == null) {
// No touch targets so treat this as an ordinary view.
handled = dispatchTransformedTouchEvent(ev, canceled, null,
TouchTarget.ALL_POINTER_IDS);
} else {
// Dispatch to touch targets, excluding the new touch target if we already
// dispatched to it. Cancel touch targets if necessary.
TouchTarget predecessor = null;
TouchTarget target = mFirstTouchTarget;
while(target ! =null) {
final TouchTarget next = target.next;
if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) {
handled = true;
} else {
final boolean cancelChild = resetCancelNextUpFlag(target.child)
|| intercepted;
if (dispatchTransformedTouchEvent(ev, cancelChild,
target.child, target.pointerIdBits)) {
handled = true;
}
if (cancelChild) {
if (predecessor == null) {
mFirstTouchTarget = next;
} else {
predecessor.next = next;
}
target.recycle();
target = next;
continue; } } predecessor = target; target = next; }}// Update list of touch targets for pointer up or cancel, if needed.
if (canceled
|| actionMasked == MotionEvent.ACTION_UP
|| actionMasked == MotionEvent.ACTION_HOVER_MOVE) {
resetTouchState();
} else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) {
final int actionIndex = ev.getActionIndex();
final int idBitsToRemove = 1<< ev.getPointerId(actionIndex); removePointersFromTouchTargets(idBitsToRemove); }}if(! handled && mInputEventConsistencyVerifier ! =null) {
mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1);
}
return handled;
}
Copy the codeonInterceptTouchEvent
public boolean onInterceptTouchEvent(MotionEvent ev) {
if (ev.isFromSource(InputDevice.SOURCE_MOUSE)
&& ev.getAction() == MotionEvent.ACTION_DOWN
&& ev.isButtonPressed(MotionEvent.BUTTON_PRIMARY)
&& isOnScrollbarThumb(ev.getX(), ev.getY())) {
return true;
}
return false;
}
Copy the codeThe sample
import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.widget.RelativeLayout;
/** * Created by Xionghu on 2018/6/6. * Desc: */
public class MyRelativeLayout extends RelativeLayout {
public MyRelativeLayout(Context context) {
super(context);
}
public MyRelativeLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
Log.i("kpioneer"."dispatchTouchEvent:action--"+ev.getAction()+"---view:MyRelativeLayout");
return super.dispatchTouchEvent(ev);
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
Log.i("kpioneer"."onInterceptTouchEvent:action--"+ev.getAction()+"---view:MyRelativeLayout");
return super.onInterceptTouchEvent(ev);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
Log.i("kpioneer"."onTouchEvent:action--"+event.getAction()+"---view:MyRelativeLayout");
return super.onTouchEvent(event); }}Copy the codeClick on the Button
06-06 11:05:18. 340, 27438-27438 / com. Haocai. Eventdemo I/kpioneer: DispatchTouchEvent: action - 0 - view: MyRelativeLayout 06-06 11:05:18. 340, 27438-27438 / com. Haocai. Eventdemo I/kpioneer: OnInterceptTouchEvent: action - 0 - view: MyRelativeLayout 06-06 11:05:18. 340, 27438-27438 / com. Haocai. Eventdemo I/kpioneer: DispatchTouchEvent: action - 0 06-06 11:05:18. 340, 27438-27438 / com. Haocai. Eventdemo I/kpioneer: OnTouchListener:acton--0----view:com.haocai.eventdemo.MyButton{8e32527 VFED.. C.. . 0 and - 264186 # 7 f070022 app: id/for} 06-06 11:05:18. 340, 27438-27438 / com. Haocai. Eventdemo I/kpioneer: OnTouchEvent: action - 0 06-06 11:05:18. 370, 27438-27438 / com. Haocai. Eventdemo I/kpioneer: DispatchTouchEvent: action - 2 - view: MyRelativeLayout 06-06 11:05:18. 370, 27438-27438 / com. Haocai. Eventdemo I/kpioneer: OnInterceptTouchEvent: action - 2 - view: MyRelativeLayout 06-06 11:05:18. 370, 27438-27438 / com. Haocai. Eventdemo I/kpioneer: DispatchTouchEvent: action - 06-06 11:05:18. 2, 370, 27438-27438 / com. Haocai. Eventdemo I/kpioneer: OnTouchListener:acton--2----view:com.haocai.eventdemo.MyButton{8e32527 VFED.. C.. . P.... 0 and - 264186 # 7 f070022 app: id/for} 06-06 11:05:18. 380, 27438-27438 / com. Haocai. Eventdemo I/kpioneer: OnTouchEvent: action - 06-06 11:05:18. 2, 390, 27438-27438 / com. Haocai. Eventdemo I/kpioneer: DispatchTouchEvent: action - 2 - view: MyRelativeLayout 06-06 11:05:18. 390, 27438-27438 / com. Haocai. Eventdemo I/kpioneer: OnInterceptTouchEvent: action - 2 - view: MyRelativeLayout 06-06 11:05:18. 390, 27438-27438 / com. Haocai. Eventdemo I/kpioneer: DispatchTouchEvent: action - 06-06 11:05:18. 2, 390, 27438-27438 / com. Haocai. Eventdemo I/kpioneer: OnTouchListener:acton--2----view:com.haocai.eventdemo.MyButton{8e32527 VFED.. C.. . P.... 0 and - 264186 # 7 f070022 app: id/for} 06-06 11:05:18. 390, 27438-27438 / com. Haocai. Eventdemo I/kpioneer: OnTouchEvent: action - 06-06 11:05:18. 2, 400, 27438-27438 / com. Haocai. Eventdemo I/kpioneer: DispatchTouchEvent: action - 2 - view: MyRelativeLayout 06-06 11:05:18. 400, 27438-27438 / com. Haocai. Eventdemo I/kpioneer: OnInterceptTouchEvent: action - 2 - view: MyRelativeLayout 06-06 11:05:18. 400, 27438-27438 / com. Haocai. Eventdemo I/kpioneer: DispatchTouchEvent: action - 06-06 11:05:18. 2, 400, 27438-27438 / com. Haocai. Eventdemo I/kpioneer: OnTouchListener:acton--2----view:com.haocai.eventdemo.MyButton{8e32527 VFED.. C.. . P.... 0 and - 264186 # 7 f070022 app: id/for} 06-06 11:05:18. 410, 27438-27438 / com. Haocai. Eventdemo I/kpioneer: OnTouchEvent: action - 06-06 11:05:18. 2, 410, 27438-27438 / com. Haocai. Eventdemo I/kpioneer: DispatchTouchEvent: action - 1 - - - the view: MyRelativeLayout 06-06 11:05:18. 410, 27438-27438 / com. Haocai. Eventdemo I/kpioneer: OnInterceptTouchEvent: action - 1 - - - the view: MyRelativeLayout 06-06 11:05:18. 410, 27438-27438 / com. Haocai. Eventdemo I/kpioneer: DispatchTouchEvent: action - 06-06 11:05:18. 1, 410, 27438-27438 / com. Haocai. Eventdemo I/kpioneer: OnTouchListener:acton--1----view:com.haocai.eventdemo.MyButton{8e32527 VFED.. C.. . P.... 0 and - 264186 # 7 f070022 app: id/for} 06-06 11:05:18. 410, 27438-27438 / com. Haocai. Eventdemo I/kpioneer: OnTouchEvent: action - 06-06 11:05:18. 1, 410, 27438-27438 / com. Haocai. Eventdemo I/kpioneer: OnClickListener----view:com.haocai.eventdemo.MyButton{8e32527 VFED.. C.. . P.... 0 and - 264186 # 7 f070022 app: id/for the}Copy the codeIn this example, the Button event click:
- The parent container touches the event first
- ViewGroup order: DispatchTouchEvent –>onInterceptTouchevent–>dispatchTouchEvent (Button) –>OnTouchListener(Button) –>return false– > OnTouchEvent (Button) (consumable event) —– onTouchEvent (this sample parent layout is not called)