public class View implements Drawable.Callback, KeyEvent.Callback,
        AccessibilityEventSource {
    public boolean dispatchTouchEvent(MotionEvent event) {
            //noinspection SimplifiableIfStatement
            // 设置的 触摸监听器 就是封装在该对象中 
            ListenerInfo li = mListenerInfo;
            // 判断该组件是否被用户设置了 触摸监听器 OnTouchListener
            if (li != null && li.mOnTouchListener != null
                    && (mViewFlags & ENABLED_MASK) == ENABLED
                    // 执行被用户设置的 触摸监听器 OnTouchListener
                    && li.mOnTouchListener.onTouch(this, event)) {
                // 如果用户设置的 触摸监听器 OnTouchListener 触摸方法返回 true
                // 此时该分发方法的返回值就是 true 
                result = true;
            }
    }
}

public class View implements Drawable.Callback, KeyEvent.Callback,
        AccessibilityEventSource {
    public boolean dispatchTouchEvent(MotionEvent event) {
    // 如果上面为 true ( 触摸监听器的触摸事件处理返回 true ) , 就会阻断该分支的命中 , 该分支不执行了 
    // 也就不会调用 View 组件自己的 onTouchEvent 方法 
    // 因此 , 如果用户的 触摸监听器 OnTouchListener 返回 true 
    // 则 用户的 点击监听器 OnClickListener 会被屏蔽掉 
    // 如果同时设置了 点击监听器 OnClickListener 和 触摸监听器 OnTouchListener 
    // 触摸监听器 OnTouchListener 返回 false , 点击监听器 OnClickListener 才能被调用到 
            if (!result && onTouchEvent(event)) {
                result = true;
            }
    }
}

public class View implements Drawable.Callback, KeyEvent.Callback,
        AccessibilityEventSource {
    public boolean onTouchEvent(MotionEvent event) {
        if (clickable || (viewFlags & TOOLTIP) == TOOLTIP) {
            switch (action) {
                case MotionEvent.ACTION_UP:
                    // 点击事件 Click 是 按下 + 抬起 事件 
                    // 如果要判定点击 , 需要同时有 MotionEvent.ACTION_DOWN + MotionEvent.ACTION_UP 事件 
               
                        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) {
                                    // 此处创建点击对象 
                                    mPerformClick = new PerformClick();
                                }
                                // 调用点击事件 
                                if (!post(mPerformClick)) {
                                    performClickInternal();
                                }
                            }
                        }
    }
}

public class View implements Drawable.Callback, KeyEvent.Callback,
        AccessibilityEventSource {
    private boolean performClickInternal() {
        // Must notify autofill manager before performing the click actions to avoid scenarios where
        // the app has a click listener that changes the state of views the autofill service might
        // be interested on.
        notifyAutofillManagerOnClick();
        return performClick();
    }
}