SystemUI点击事件

点击状态栏弹出一部分

a.)Activity——>dispatchTouchEvent(){
if (getWindow().superDispatchTouchEvent(ev)) {——>mWindow=PolicyManager.makeNewWindow()——>PhoneWindow.
return true; superDispatchTouchEvent()——>DecorView(FrameLayout).
} superDispatchTouchEvent()——>ViewGroup.
return onTouchEvent(ev); DispatchTouchEvent()
}
b.)ViewGroup.DispatchTouchEvent()——>false:Activity.onTouchEvent(ev)
——>true:表示此事件被子view消费掉，此事件的传递也就到此为止

c.)ViewGroup.DispatchTouchEvent()中调用intercepted = onInterceptTouchEvent(ev);
——>如果设置了阻断：DispatchTouchEvent()返回false；那么这个事件不会再继续往下传递，false:Activity.onTouchEvent(ev)

e.)StatusBarWindowView:(extends FrameLayout)
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
boolean intercept = false;
if (mNotificationPanel.isFullyExpanded() && mScrollView.getVisibility() == View.VISIBLE) {
intercept = mExpandHelper.onInterceptTouchEvent(ev);
}
if (!intercept) {
super.onInterceptTouchEvent(ev);//默认false；不拦截事件的传递
}
if (intercept) {
MotionEvent cancellation = MotionEvent.obtain(ev);
cancellation.setAction(MotionEvent.ACTION_CANCEL);
latestItems.onInterceptTouchEvent(cancellation);
cancellation.recycle();
}
return intercept;
}
f.)ViewGroup中:
—> if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) {
// Child wants to receive touch within its bounds.
mLastTouchDownTime = ev.getDownTime();
mLastTouchDownIndex = childIndex;
mLastTouchDownX = ev.getX();
mLastTouchDownY = ev.getY();
newTouchTarget = addTouchTarget(child, idBitsToAssign);
alreadyDispatchedToNewTouchTarget = true;
break;
}

—>if (cancel || oldAction == MotionEvent.ACTION_CANCEL) {
event.setAction(MotionEvent.ACTION_CANCEL);
if (child == null) {
handled = super.dispatchTouchEvent(event);
} else {
handled = child.dispatchTouchEvent(event);
}
event.setAction(oldAction);
if (DBG_MOTION) {
Xlog.d(TAG, “Dispatch cancel action end: handled = ” + handled + “,oldAction = ”
+ oldAction + “,child = ” + child + “,this = ” + this);
}
return handled;
}
—>child.dispatchTouchEvent(event);

/com.android.systemui.statusbar.phone.PhoneStatusBarView(没做事件处理)
—>com.android.systemui.statusbar.phone.NotificationPanelView(extends PanelView)

—>View:
public boolean dispatchTouchEvent(MotionEvent event) {
if (mInputEventConsistencyVerifier != null) {
mInputEventConsistencyVerifier.onTouchEvent(event, 0);
…
if (onFilterTouchEventForSecurity(event)) {
//noinspection SimplifiableIfStatement
ListenerInfo li = mListenerInfo;
if (li != null && li.mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED
&& li.mOnTouchListener.onTouch(this, event)) {
/// M : add log to help debugging
if (DBG_TOUCH) {
Xlog.d(VIEW_LOG_TAG, “handle Touch event by listerner, listener = ” + li + “, event = ”
+ event + “, this = ” + this);
}
return true;
}

        if (onTouchEvent(event)) {
            /// M : add log to help debugging
            if (DBG_TOUCH) {
                Xlog.d(VIEW_LOG_TAG, "handle Touch event by onTouchEvent, event = "
                    + event + ", this = " + this);
            }
            return true;
        }
    }

}

—>如果view实现了OnTouchListener接口，则优先执行此方法;如果没有，则执行onTouchEvent(event)方法

—>PanelView:
@Override
public boolean onTouchEvent(MotionEvent event) {
return mHandleView.dispatchTouchEvent(event);
}

—>mHandleView.setOnTouchListener(new View.OnTouchListener() {
….

    switch (event.getActionMasked()) {
                    case MotionEvent.ACTION_DOWN:
                        mTracking = true;
                        mHandleView.setPressed(true);
                        postInvalidate(); // catch the press state change
                        mInitialTouchY = y;
                        mVelocityTracker = FlingTracker.obtain();
                        trackMovement(event);
                        mTimeAnimator.cancel(); // end any outstanding animations
                        mBar.onTrackingStarted(PanelView.this);
                        mTouchOffset = (rawY - mAbsPos[1]) - mExpandedHeight;
                        if (mExpandedHeight == 0) {
                            mJustPeeked = true;
                            runPeekAnimation();
                        }
                        break;

    ....

}

—>runPeekAnimation();

—>private void runPeekAnimation() {
if (DEBUG) logf(“peek to height=%.1f”, mPeekHeight);
if (mTimeAnimator.isStarted()) {
return;
}
if (mPeekAnimator == null) {
mPeekAnimator = ObjectAnimator.ofFloat(this,
“expandedHeight”, mPeekHeight)
.setDuration(250);
}
mPeekAnimator.start();
}