本文介绍了SwipeRefreshLayout会干扰ViewPager中的GridView的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
java部分 public class MultiSwipeRefreshLayout extends SwipeRefreshLayout { private GridView [] mSwipeableChildren; private int visibleView = 0; public MultiSwipeRefreshLayout（上下文上下文）{ super（context）; mSwipeableChildren =新的GridView [3]; public MultiSwipeRefreshLayout（Context context，AttributeSet attrs）{ super（context，attrs）; mSwipeableChildren =新的GridView [3]; } public void addGridView（GridView v，int i） { mSwipeableChildren [i] = v; } / ** *此方法控制触发刷新手势的时间。通过在这里返回false *我们表示视图处于刷新姿态可以开始的状态。 * *< p>由于{@link android.support.v4.widget.SwipeRefreshLayout}仅支持 * default的一个直接子元素，因此我们需要手动迭代可滑动的子元素看看是否有任何处于 *状态来触发该手势。如果是这样，我们返回false来开始手势。 * / @Override public boolean canChildScrollUp（）{ if（mSwipeableChildren！= null&& mSwipeableChildren.length> 0）{ for int i = 0; i <3; i ++） { if（（i == visibleView）&& mSwipeableChildren [i]！= null&&！canViewScrollUp（mSwipeableChildren [i ]）） { return false; } } } 返回true; } / ** *检查{@link View}是否可以从当前位置向上滚动的实用方法。 *处理平台版本差异，提供 *所需的向后兼容功能。 * / private static boolean canViewScrollUp（GridView视图） {返回view.getChildCount（）> 0&& （view.getFirstVisiblePosition（）> 0 || view.getChildAt（0）.getTop（）< view.getPaddingTop（））; } public void setVisibleView（int i） { visibleView = i; } }
对于主布局，我有一个 ViewPager ，其中3个片段为页面，其中2个为 GrideView 里面有他们。
主页代码：
< android .support.v4.widget.SwipeRefreshLayout xmlns：android =schemas.android/apk/res/android android：id =@ + id / mainRefreshLayout android：layout_width =match_parent android：layout_height =match_parent> < android.support.v4.view.ViewPager android：id =@ + id / main_pager android：layout_width =match_parent android ：layout_height = match_parent > < /android.support.v4.view.ViewPager> < /android.support.v4.widget.SwipeRefreshLayout>第一个片段的代码：
< GridView android：id =@ + id / firstCategoryGridView android：layout_width =match_parent android：layout_height =match_parent android：numColumns =1 android：stretchMode =columnWidth android：scrollbars =none android：listSelector =＃00000000> < / GridView>网格视图充满了项目。在列表中间，当我向上滚动 SwipeRefreshLayout 时，会在列表达到顶部之前触发。 我如何解决这个问题？
解决方案）。
因此，您可以从Google SwipeRefreshMultipleViews ，在类 MultiSwipeRefreshLayout 中稍作改动，我设法解决了这个问题。
< RelativeLayout xmlns：android =schemas.android/apk/res/android android：layout_width =match_parent android：layout_height =match_parent android：background =@ color / black> < android.support.v7.widget.Toolbar xmlns：app =schemas.android/apk/res-auto android：id =@ android：layout_width =match_parent android：layout_height =？attr / actionBarSize android：background =@ color / dark_blue app： theme =@ style / Theme.AppCompat android：layout_alignParentTop =true/> < com.mehdok.slidingtabs.SlidingTabLayout android：id =@ + id / main_sliding_tabs android：background =@ color / blue android：layout_width =match_parent android：layout_height =wrap_content android：layout_below =@ id / main_toolbar/>
i have a ViewPager for the main layout, with 3 fragment as pages, 2 of them has a GrideView inside them.
the main page code:
<android.support.v4.widget.SwipeRefreshLayout xmlns:android="schemas.android/apk/res/android" android:id="@+id/mainRefreshLayout" android:layout_width="match_parent" android:layout_height="match_parent"> <android.support.v4.view.ViewPager android:id="@+id/main_pager" android:layout_width="match_parent" android:layout_height="match_parent"> </android.support.v4.view.ViewPager> </android.support.v4.widget.SwipeRefreshLayout>code of first fragment:
<GridView android:id="@+id/firstCategoryGridView" android:layout_width="match_parent" android:layout_height="match_parent" android:numColumns="1" android:stretchMode="columnWidth" android:scrollbars="none" android:listSelector="#00000000"> </GridView>the grid view is filled with items. in the middle of list when i scroll upward the SwipeRefreshLayout get triggered before the list reach top. how can i solve this?
解决方案i hate answering my own question, but i always do:).
so from an example of google SwipeRefreshMultipleViews, with a little change in class MultiSwipeRefreshLayout i managed to solve the problem.
<RelativeLayout xmlns:android="schemas.android/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@color/black"> <android.support.v7.widget.Toolbar xmlns:app="schemas.android/apk/res-auto" android:id="@+id/main_toolbar" android:layout_width="match_parent" android:layout_height="?attr/actionBarSize" android:background="@color/dark_blue" app:theme="@style/Theme.AppCompat" android:layout_alignParentTop="true"/> <com.mehdok.slidingtabs.SlidingTabLayout android:id="@+id/main_sliding_tabs" android:background="@color/blue" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@id/main_toolbar" /> <fr.castorflex.android.smoothprogressbar.SmoothProgressBar xmlns:android="schemas.android/apk/res/android" xmlns:app="schemas.android/apk/res-auto" android:layout_width="match_parent" android:layout_height="4dp" android:indeterminate="true" app:spb_sections_count="4" app:spb_color="@color/white" app:spb_speed="0.5" app:spb_stroke_width="4dp" app:spb_stroke_separator_length="4dp" app:spb_reversed="false" app:spb_mirror_mode="false" app:spb_progressiveStart_activated="false" app:spb_progressiveStart_speed="1.5" app:spb_progressiveStop_speed="3.4" android:layout_below="@id/main_toolbar" android:visibility="gone" android:id="@+id/downloadBar"/> <com.mehdok.views.MultiSwipeRefreshLayout android:id="@+id/swiperefresh" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_below="@id/main_sliding_tabs"> <android.support.v4.view.ViewPager android:id="@+id/main_pager" android:layout_width="match_parent" android:layout_height="match_parent" > </android.support.v4.view.ViewPager> </com.mehdok.views.MultiSwipeRefreshLayout> </RelativeLayout>the java part
public class MultiSwipeRefreshLayout extends SwipeRefreshLayout { private GridView[] mSwipeableChildren; private int visibleView = 0; public MultiSwipeRefreshLayout(Context context) { super(context); mSwipeableChildren = new GridView[3]; } public MultiSwipeRefreshLayout(Context context, AttributeSet attrs) { super(context, attrs); mSwipeableChildren = new GridView[3]; } public void addGridView(GridView v, int i) { mSwipeableChildren[i] = v; } /** * This method controls when the swipe-to-refresh gesture is triggered. By returning false here * we are signifying that the view is in a state where a refresh gesture can start. * * <p>As {@link android.support.v4.widget.SwipeRefreshLayout} only supports one direct child by * default, we need to manually iterate through our swipeable children to see if any are in a * state to trigger the gesture. If so we return false to start the gesture. */ @Override public boolean canChildScrollUp() { if (mSwipeableChildren != null && mSwipeableChildren.length > 0) { for(int i = 0; i < 3; i++) { if((i == visibleView) && mSwipeableChildren[i] != null && !canViewScrollUp(mSwipeableChildren[i])) { return false; } } } return true; } /** * Utility method to check whether a {@link View} can scroll up from it's current position. * Handles platform version differences, providing backwards compatible functionality where * needed. */ private static boolean canViewScrollUp(GridView view) { return view.getChildCount() > 0 && (view.getFirstVisiblePosition() > 0 || view.getChildAt(0).getTop() < view.getPaddingTop()); } public void setVisibleView(int i) { visibleView = i; } }
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SwipeRefreshLayout会干扰ViewPager中的GridView
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