no route to host Chromium网页输入事件捕捉和手势检测过程分析(2)

参数event指向的MotionEvent对象描写叙述的就是当前发生的Touch事件。no route to hostContentView类的成员变量mContentViewCore指向的是一个ContentViewCore对象，ContentView类的成员函数onTouchEvent调用这个ContentViewCore对象的成员函数onTouchEvent处理参数event所描写叙述的Touch事件。

ContentViewCore类的成员函数onTouchEvent的实现例如以下所看到的：

public class ContentViewCore
        implements NavigationClient, AccessibilityStateChangeListener, ScreenOrientationObserver {
    ......

    public boolean onTouchEvent(MotionEvent event) {
        TraceEvent.begin("onTouchEvent");
        try {
            ......

            final int pointerCount = event.getPointerCount();
            final boolean consumed = nativeOnTouchEvent(mNativeContentViewCore, event,
                    event.getEventTime(), eventAction,
                    pointerCount, event.getHistorySize(), event.getActionIndex(),
                    event.getX(), event.getY(),
                    pointerCount > 1 ? event.getX(1) : 0,
                    pointerCount > 1 ?
 event.getY(1) : 0,
                    event.getPointerId(0), pointerCount > 1 ?
 event.getPointerId(1) : -1,
                    event.getTouchMajor(), pointerCount > 1 ? event.getTouchMajor(1) : 0,
                    event.getRawX(), event.getRawY(),
                    event.getToolType(0),
                    pointerCount > 1 ?
 event.getToolType(1) : MotionEvent.TOOL_TYPE_UNKNOWN,
                    event.getButtonState());

            ......
            return consumed;
        } finally {
            TraceEvent.end("onTouchEvent");
        }
    }

    ......
}

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