点击ViewGroup的空白区域，子View会变为点击态的bug原因及修复

来源：互联网发布：java商城项目经验编辑：程序博客网时间：2024/05/21 10:53

点击ViewGroup的空白区域，子View会变为点击态的bug原因及修复：

原因：在ViewGroup被点击时，会触发setPressed(boolean pressed)方法，如下：

public void setPressed(boolean pressed) {        final boolean needsRefresh = pressed != ((mPrivateFlags & PFLAG_PRESSED) == PFLAG_PRESSED);        if (pressed) {            mPrivateFlags |= PFLAG_PRESSED;        } else {            mPrivateFlags &= ~PFLAG_PRESSED;        }        if (needsRefresh) {            refreshDrawableState();        }        dispatchSetPressed(pressed);    }

执行完refreshDrawableState()刷新ViewGroup的背景之后会调用dispatchSetPressed(pressed)来讲press状态分发给子类处理

@Override    protected void dispatchSetPressed(boolean pressed) {        final View[] children = mChildren;        final int count = mChildrenCount;        for (int i = 0; i < count; i++) {            final View child = children[i];            // Children that are clickable on their own should not            // show a pressed state when their parent view does.            // Clearing a pressed state always propagates.            if (!pressed || (!child.isClickable() && !child.isLongClickable())) {                child.setPressed(pressed);            }        }    }

从代码可以看出如果子view的clickable == false && longclickable == false的情况下，子view会调用自己的setPressed(pressed)方法，来刷新自己的背景，如果子view的背景是一个StateListDrawable的话就会显示出处于press状态下的背景。

解决：重写ViewGroup的dispatchSetPressed方法，不做任何处理即可。

protected void dispatchSetPressed(boolean pressed) {}

0 0