android系统（5） android 输入事件处理流程（下）

深入解析Android触摸事件处理机制

最新推荐文章于 2025-11-26 16:17:36 发布

最新推荐文章于 2025-11-26 16:17:36 发布 · 109 阅读

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#移动开发 #java

接着3讲

PhoneWindow中


public boolean dispatchTouchEvent(MotionEvent ev) {
            final Callback cb = getCallback();
            return cb != null && mFeatureId < 0 ? cb.dispatchTouchEvent(ev) : super.dispatchTouchEvent(ev);
}

callback 其实就是 activity (Activity attach 方法中可见)


public boolean dispatchTouchEvent(MotionEvent ev) {
        if (ev.getAction() == MotionEvent.ACTION_DOWN) {
            onUserInteraction();
        }
        if (getWindow().superDispatchTouchEvent(ev)) {
            return true;
        }
        return onTouchEvent(ev);
}

activity首先调用 phonewindow的 superDispatchTouchEvent然后调用自己的onTouchEvent

PhoneWindow.java


@Override
public boolean superDispatchTouchEvent(MotionEvent event) {
	return mDecor.superDispatchTouchEvent(event);
}


private final class DecorView extends FrameLayout 

public boolean superDispatchTouchEvent(MotionEvent event) {
            return super.dispatchTouchEvent(event);
}

decorview 继承 ViewGroup


public boolean dispatchTouchEvent(MotionEvent ev) {
      ...
     final int count = mChildrenCount;
    for (int i = count - 1; i >= 0; i--) {
        final View child = children[i];
        if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE
                            || child.getAnimation() != null) {
            child.getHitRect(frame);
            if (frame.contains(scrolledXInt, scrolledYInt)) {
                ev.setLocation(xc, yc);
                child.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT;
                if (child.dispatchTouchEvent(ev))  {
                     mMotionTarget = child;
                     return true;
                }
             }
        }
    }
     ...