MotionLayout可防止在所有视图上使用ClickListener [英] MotionLayout prevents ClickListener on all Views
问题描述
我正在将MotionLayout与scene-xml一起使用:
I am using a MotionLayout with a scene-xml:
<Transition
motion:constraintSetStart="@+id/start"
motion:constraintSetEnd="@+id/end"
>
<OnSwipe
motion:touchAnchorId="@+id/v_top_sheet"
motion:touchRegionId="@+id/v_top_sheet_touch_region"
motion:touchAnchorSide="bottom"
motion:dragDirection="dragDown" />
</Transition>
这两个 ConstraintSets
仅引用了两个View ID: v_notifications_container
和 v_top_sheet
.
The 2 ConstraintSets
are referencing only 2 View IDs: v_notifications_container
and v_top_sheet
.
在我的活动"中,我想为该MotionLayout中的其他视图之一设置普通的ClickListener:
In my Activity I want to set a normal ClickListener to one of the other Views in this MotionLayout:
iv_notification_status.setOnClickListener { Timber.d("Hello") }
该行已执行,但ClickListener从未触发.我搜索了其他帖子,但是大多数帖子都涉及在同一视图(即 motion:touchAnchorId
)上设置ClickListener的问题.这里不是这种情况.ClickListener设置为一个在MotionLayout设置中未曾提及的视图.如果删除 app:layoutDescription
属性,则单击有效.
This line is executed, but the ClickListener is never triggered. I searched other posts, but most of them deal with setting a ClickListener on the same View that is the motion:touchAnchorId
. This is not the case here. The ClickListener is set to a View that is not once mentioned in the MotionLayout setup. If I remove the app:layoutDescription
attribute, the click works.
我也尝试使用 setOnTouchListener
,但也从未使用过.
I also tried to use setOnTouchListener
, but it is also never called.
如何在MotionLayout中设置点击侦听器?
推荐答案
With the help of this great medium article I figured out that MotionLayout is intercepting click events even though the motion scene only contains an OnSwipe transition.
因此,我编写了一个自定义的MotionLayout,以仅处理 ACTION_MOVE
并将所有其他触摸事件传递到视图树.像魅力一样工作:
So I wrote a customized MotionLayout to only handle ACTION_MOVE
and pass all other touch events down the View tree. Works like a charm:
/**
* MotionLayout will intercept all touch events and take control over them.
* That means that View on top of MotionLayout (i.e. children of MotionLayout) will not
* receive touch events.
*
* If the motion scene uses only a onSwipe transition, all click events are intercepted nevertheless.
* This is why we override onInterceptTouchEvent in this class and only let swipe actions be handled
* by MotionLayout. All other actions are passed down the View tree so that possible ClickListener can
* receive the touch/click events.
*/
class ClickableMotionLayout: MotionLayout {
constructor(context: Context) : super(context)
constructor(context: Context, attrs: AttributeSet?) : super(context, attrs)
constructor(context: Context, attrs: AttributeSet?, defStyleAttr: Int) : super(context, attrs, defStyleAttr)
override fun onInterceptTouchEvent(event: MotionEvent?): Boolean {
if (event?.action == MotionEvent.ACTION_MOVE) {
return super.onInterceptTouchEvent(event)
}
return false
}
}
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