首先:我之前使用过回收器视图和滚动侦听器,一切都很棒,但这是第一次使用协调器布局并在嵌套滚动视图中使用片段,所以我认为与设计有关的问题
这是我的滚动代码摘要
categoryRecyclerView?.addOnScrollListener(object : RecyclerView.OnScrollListener() {
override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
super.onScrolled(recyclerView, dx, dy)
Log.e("scrolling","scroll")
if (dy > 0) {
Log.e("scrolling","vertical")
因此,当我滚动时,无论我是否滚动,我都不会在logcat中看到(“滚动”,“垂直”),但是我只会看到一次(“滚动”,“滚动”)
这是我的活动xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:background="@color/layoutBackground">
<android.support.design.widget.AppBarLayout
android:id="@+id/app_bar_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?actionBarSize"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
</android.support.design.widget.AppBarLayout>
<android.support.v4.widget.NestedScrollView
android:id="@+id/nestedScroll"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clipToPadding="false"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
<FrameLayout
android:padding="8dp"
android:id="@+id/fragmentContainer"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</android.support.v4.widget.NestedScrollView>
<android.support.design.widget.BottomNavigationView
android:id="@+id/bottomNavigationView"
android:layout_width="match_parent"
android:layout_height="56dp"
android:layout_gravity="bottom"
android:background="@color/colorPrimary"
android:padding="8dp"
app:layout_behavior="@string/hide_bottom_view_on_scroll_behavior"
app:itemIconTint="@drawable/navigation_item_selector"
app:itemTextColor="@android:color/white"
app:menu="@menu/navigation_menu" />
</android.support.design.widget.CoordinatorLayout>
这是我的xml片段
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/layoutBackground"
tools:context=".fragments.AllItemsFragment">
<android.support.v7.widget.RecyclerView
android:id="@+id/categoryRecyclerView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:listitem="@layout/entertainment_recycler_view_item" />
<ProgressBar
android:id="@+id/loadingCategoryList"
style="?android:attr/progressBarStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
在onActivty中创建在我设置的片段中
scrollView.isNestedScrollingEnabled = false
,在初始化recyclerview代码中,我将recyclerview设置为
categoryRecyclerView?.isNestedScrollingEnabled = false
categoryRecyclerView?.setHasFixedSize(false);
答案 0 :(得分:0)
设置
categoryRecyclerView?.isNestedScrollingEnabled = true
而不是使用recyclerview.addOnScrollListener(),而是使用nestedScrollView.setOnScrollChangeListener()。
nestedScrollView.setOnScrollChangeListener(new NestedScrollView.OnScrollChangeListener() {
@Override
public void onScrollChange(NestedScrollView v, int scrollX, int scrollY, int oldScrollX,
int oldScrollY) {
LinearLayoutManager layoutManager = (LinearLayoutManager) questionRecyclerView.getLayoutManager();
if (layoutManager != null) {
int visibleItemCount = layoutManager.getChildCount();
int totalItemCount = layoutManager.getItemCount();
int firstVisibleItemPosition = layoutManager.findFirstVisibleItemPosition();
if (!questionAdapter.isLoading()) {
if (visibleItemCount +firstVisibleItemPosition >= totalItemCount
&& firstVisibleItemPosition >= 0
&& totalItemCount >= PAGE_SIZE) {
// loadMore();
}
}
}
}
}});