问题描述
我使用 ViewPager 来浏览页面,每个页面都包含一个 nestedScrollView 和一个 RecyclerView。 nestedScrollView 用于在分屏模式下滚动图表。
fragment_accounts:
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ProgressBar
android:id="@+id/mAccountsProgressbar"
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:visibility="gone"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:visibility="visible" />
<androidx.core.widget.nestedScrollView
android:id="@+id/mAccountsScrollView"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/mAccountsProgressbar">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<at.guger.moneybook.core.ui.widget.strokePieChart
android:id="@+id/mAccountsPieChart"
android:layout_width="match_parent"
android:layout_height="@dimen/default_chart_height"
app:accounts="@{viewmodel.accounts}"
app:bold="true"
app:fontResId="@font/eczar_regular"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/mAccountsProgressbar"
app:textSize="42sp"
tools:text="$ 1234,56" />
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/mAccountsRecyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="8dp"
tools:itemCount="4"
tools:listitem="@layout/item_account" />
</LinearLayout>
</androidx.core.widget.nestedScrollView>
</androidx.constraintlayout.widget.ConstraintLayout>
现在,我使用 OnTouchListener 来检测我的 RecyclerView 中的点击。在 ViewPager 中的页面之间滑动时,RecyclerView 还会检测长按 RecyclerView 中的项目。 如何确保 RecyclerView 在滑动到下一页时不使用触摸事件?
澄清:我想在 RecyclerView 中的项目上接收长按事件,但我不想在用户在 ViewPager 的页面之间滑动时接收它们!
OnItemTouchListener:
class OnItemTouchListener(context: Context,recyclerView: RecyclerView,private val onTouchCallback: ItemTouchListener) : RecyclerView.OnItemTouchListener {
//region Variables
private val gestureDetector: GestureDetectorCompat
//endregion
init {
gestureDetector = GestureDetectorCompat(context,object : GestureDetector.SimpleOnGestureListener() {
private val MIN_SWIPE_disTANCE: Int = 50
private lateinit var downMotionEvent: MotionEvent
override fun onDown(e: MotionEvent?): Boolean {
e?.let { downMotionEvent = it }
return super.onDown(e)
}
override fun onSingleTapUp(e: MotionEvent?): Boolean {
return true
}
override fun onLongPress(e: MotionEvent?) {
e?.let {
val child: View? = recyclerView.findChildViewUnder(it.x,it.y)
if (child != null && !isGestureSwipe(it)) {
onTouchCallback.onItemLongClick(child,recyclerView.getChildLayoutPosition(child),it)
}
}
super.onLongPress(e)
}
fun isGestureSwipe(e: MotionEvent): Boolean {
return downMotionEvent.x - e.x >= MIN_SWIPE_disTANCE
}
})
}
//region TouchHandler
override fun onInterceptTouchEvent(rv: RecyclerView,e: MotionEvent): Boolean {
val childView = rv.findChildViewUnder(e.x,e.y)
if (childView != null && gestureDetector.onTouchEvent(e)) {
onTouchCallback.onItemClick(childView,rv.getChildLayoutPosition(childView),e)
}
return false
}
override fun onRequestdisallowInterceptTouchEvent(disallowIntercept: Boolean) {
}
override fun onTouchEvent(rv: RecyclerView,e: MotionEvent) {
}
//endregion
interface ItemTouchListener {
fun onItemClick(view: View,pos: Int,e: MotionEvent)
fun onItemLongClick(view: View,e: MotionEvent)
}
companion object {
fun isViewClicked(container: View,@IdRes viewId: Int,e: MotionEvent): Boolean {
val view = container.findViewById<View>(viewId)
return isViewClicked(view,e)
}
fun isViewClicked(view: View,e: MotionEvent): Boolean {
val rect = Rect()
view.getGlobalVisibleRect(rect)
return view.isVisible && rect.contains(e.rawX.toInt(),e.rawY.toInt())
}
}
}
父片段,其中嵌入了 fragment_accounts:
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.constraintlayout.widget.ConstraintLayout
android:id="@+id/mHomeConstraintLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent">
<androidx.viewpager2.widget.ViewPager2
android:id="@+id/mHomeViewPager"
android:layout_width="0dp"
android:layout_height="0dp"
android:orientation="horizontal"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/mHoMetabs" />
<at.guger.moneybook.core.ui.widget.LabelVisibilityTabLayout
android:id="@+id/mHoMetabs"
style="@style/Widget.MaterialComponents.TabLayout"
android:layout_width="0dp"
android:layout_height="?attr/actionBarSize"
android:backgroundTint="@android:color/transparent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:tabIconTint="@color/tab_highlight_selector"
app:tabIndicator="@null"
app:tabInlineLabel="true"
app:tabMode="scrollable"
app:tabRippleColor="@color/colorRippleMaterialDark"
app:tabTextColor="@color/tab_highlight_selector" />
</androidx.constraintlayout.widget.ConstraintLayout>
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="@+id/fabHomeAddTransaction"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="16dp"
android:layout_marginBottom="16dp"
android:backgroundTint="?colorPrimary"
android:clickable="true"
android:contentDescription="@string/AddTransaction"
android:focusable="true"
android:src="@drawable/ic_add"
app:layout_anchor="@+id/mHomeConstraintLayout"
app:layout_anchorGravity="bottom|end"
app:tint="?colorOnPrimary" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>
所有其他代码都可以在 Github (https://github.com/guger/MoneyBook) 上找到。
解决方法
也许玩焦点可能会有所帮助,我的意思是,如果您要滑动,则从 RecyclerView 清除焦点,如果它没有聚焦,您现在可以确定 onTouch 事件() 不会被调用,否则你会为 RecyclerView 调用它。
否则我不知道如何让它工作,因为或者你滑动或者你在LongPress
,由于我在 OnItemTouchListener
中找不到错误,我分别使用 View.OnClickListener
和 OnLongClickListener
重写了 Click-/Long-Click-Detection。
这解决了我的问题,作为一种解决方法。