Android SwipeRefreshLayout如果子项不是ListView或ScrollView,如何实现canChildScrollUp
您好,我有一个SwipeRefreshLayout,其中包含一个相对布局,其中包含一个滚动视图和另一个视图。当我向下滚动列表时,有时不会向上滚动,而是运行onRefresh功能。除非视图位于顶部,否则如何防止它运行此操作?我读过canChildScrollUp,但没有找到正确实施它的方法 这是我的布局Android SwipeRefreshLayout如果子项不是ListView或ScrollView,如何实现canChildScrollUp,android,Android,您好,我有一个SwipeRefreshLayout,其中包含一个相对布局,其中包含一个滚动视图和另一个视图。当我向下滚动列表时,有时不会向上滚动,而是运行onRefresh功能。除非视图位于顶部,否则如何防止它运行此操作?我读过canChildScrollUp,但没有找到正确实施它的方法 这是我的布局 <?xml version="1.0" encoding="utf-8"?> <android.support.v4.widget.SwipeRefreshLayout
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.SwipeRefreshLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/swipe_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
>
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="none">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/profile"
android:background="@drawable/homepage_image_1">
<com.alldaypa.alldaypa.customviews.CircularImageView
android:layout_width="75dp"
android:layout_height="75dp"
app:border_color="#FFFFFF"
app:border_width="8dp"
app:shadow="false"
android:id="@+id/profile_image"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_marginLeft="70dp"
android:layout_marginTop="20dp"
android:src="@drawable/homepage_noimage_male"
android:clickable="true" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/profile_image"
android:layout_alignRight="@+id/profile_image"
android:src="@drawable/homepage_profile_add"
android:layout_marginRight="3dp"
android:layout_marginBottom="3dp"
/>
<TextView android:id="@+id/profile_name"
android:text="Name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20sp"
android:layout_alignTop="@+id/profile_image"
android:layout_toRightOf="@+id/profile_image"
android:layout_marginTop="20dp"
android:textColor="@color/darkgrey"
android:layout_marginLeft="10dp"/>
<TextView android:id="@+id/company"
android:text="Company"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="16sp"
android:layout_below="@+id/profile_name"
android:layout_alignLeft="@+id/profile_name"
android:textColor="@color/darkgrey"
android:layout_marginTop="-2dp"/>
</RelativeLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/availability"
android:background="@color/white"
android:padding="20dp"
android:layout_below="@+id/profile">
<TextView android:id="@+id/profile_status_title"
android:text="Your current availability status:"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="14sp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:textColor="@color/darkgrey"/>
<TextView android:id="@+id/profile_status"
android:text="Available"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="32sp"
android:layout_below="@+id/profile_status_title"
android:layout_centerHorizontal="true"
android:textColor="@color/green"
android:layout_marginTop="-2dp"/>
<TextView android:id="@+id/profile_status_reason"
android:text="On: 01924 501370"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="24sp"
android:layout_below="@+id/profile_status"
android:layout_centerHorizontal="true"
android:textColor="@color/pink"/>
</RelativeLayout>
<TextView
android:id="@+id/messages"
android:layout_width="match_parent"
android:layout_height="30dp"
android:layout_alignParentRight="true"
android:layout_below="@+id/availability"
android:ellipsize="end"
android:lines="1"
android:background="@color/pink"
android:textColor="@color/white"
android:textSize="14sp"
android:paddingLeft="10dp"
android:paddingTop="5dp"
android:gravity="left"
android:text="Messages" />
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_below="@+id/messages"
android:background="@color/midgrey">
<com.alldaypa.alldaypa.customviews.SwipeListView
xmlns:swipe="http://schemas.android.com/apk/res-auto"
android:id="@+id/list"
android:listSelector="#00000000"
android:layout_width="fill_parent"
android:layout_height="400dp"
swipe:swipeFrontView="@+id/front"
swipe:swipeBackView="@+id/back"
swipe:swipeActionLeft="reveal"
swipe:swipeMode="left"
swipe:swipeCloseAllItemsWhenMoveList="true"
swipe:swipeOpenOnLongPress="false"
swipe:swipeAnimationTime="0"
swipe:swipeOffsetLeft="200dp"
swipe:swipeOffsetRight="0dp"
android:focusable="false"
/>
<ImageView android:layout_height="1dp"
android:layout_width="match_parent"
android:background="@color/searchbg"
android:layout_below="@+id/list"
android:layout_alignLeft="@+id/list"
android:id="@+id/line"
/>
<Button
android:layout_width="match_parent"
android:layout_height="60dp"
android:background="@drawable/listitem"
android:textColor="@color/darkgrey"
android:textSize="18sp"
android:text="View all messages"
android:layout_below="@+id/line"
android:gravity="center"
android:layout_centerVertical="true"
android:id="@+id/viewall"
android:layout_centerHorizontal="true"
/>
</RelativeLayout>
</RelativeLayout>
</ScrollView>
<include layout="@layout/elv_undo_popup" android:id="@+id/undo" android:visibility="gone"/>
</RelativeLayout>
</android.support.v4.widget.SwipeRefreshLayout>
如果滚动视图位于或不位于顶部,则可能必须启用/禁用滑动布局 您可以查看此链接以获取灵感: 另一个可能对您有所帮助的示例:
我在使用水平滚动时遇到了另一个问题:多亏了@Twibit,我找到了一种方法来实现这一点。诀窍是检测scrollview的位置,如果位置为0,则将SwiperFreshLayout设置为enabled或disabled
scrollView.getViewTreeObserver().addOnScrollChangedListener(new OnScrollChangedListener() {
@Override
public void onScrollChanged() {
int scrollY = scrollView.getScrollY();
if(scrollY == 0) swipeLayout.setEnabled(true);
else swipeLayout.setEnabled(false);
}
});
canChildScrollUp()
,该方法确定视图是否可以向上滚动
//if you have several scrollable views,just iterate
for (View view : ...) {
if (view != null && view.isShown() && !canViewScrollUp(view)) {
// If the view is shown, and can not scroll upwards, return false and start the
// gesture.
return false;
}
return true;
canviewcrollup()
检查是否有任何视图无法向上滚动
private static boolean canViewScrollUp(View view) {
if (android.os.Build.VERSION.SDK_INT >= 14) {
// For ICS and above we can call canScrollVertically() to determine this
return ViewCompat.canScrollVertically(view, -1);
} else {
if (view instanceof AbsListView) {
// Pre-ICS we need to manually check the first visible item and the child view's top
// value
final AbsListView listView = (AbsListView) view;
return listView.getChildCount() > 0 &&
(listView.getFirstVisiblePosition() > 0
|| listView.getChildAt(0).getTop() < listView.getPaddingTop());
} else {
// For all other view types we just check the getScrollY() value
return view.getScrollY() > 0;
}
}
private静态布尔canViewScrollUp(视图){
如果(android.os.Build.VERSION.SDK_INT>=14){
//对于ICS及以上版本,我们可以调用canScrollVertical()来确定这一点
返回ViewCompat.CanScrollVertical(视图,-1);
}否则{
if(查看AbsListView的实例){
//在ICS之前,我们需要手动检查第一个可见项和子视图的顶部
//价值观
最终AbsListView listView=(AbsListView)视图;
返回listView.getChildCount()>0&&
(listView.getFirstVisiblePosition()>0
||getChildAt(0.getTop()0;
}
}
简短版本:
scrollView.getViewTreeObserver().addOnScrollChangedListener(新OnScrollChangedListener(){@Override public void onScrollChanged(){swipeLayout.setEnabled(scrollView.getScrollY()==0);};
如果我们用ListView替换上面的ScrollView,原则上解决方案仍然有效,但是onScrollChanged()方法内部的检查应该是:ListView.getChildAt(0.getTop()==0回答得很好!动态修复了我的问题:)这太糟糕了,先生:)
private static boolean canViewScrollUp(View view) {
if (android.os.Build.VERSION.SDK_INT >= 14) {
// For ICS and above we can call canScrollVertically() to determine this
return ViewCompat.canScrollVertically(view, -1);
} else {
if (view instanceof AbsListView) {
// Pre-ICS we need to manually check the first visible item and the child view's top
// value
final AbsListView listView = (AbsListView) view;
return listView.getChildCount() > 0 &&
(listView.getFirstVisiblePosition() > 0
|| listView.getChildAt(0).getTop() < listView.getPaddingTop());
} else {
// For all other view types we just check the getScrollY() value
return view.getScrollY() > 0;
}
}