我有一个 ListView
始终启用 fastScroll
和 SwipeRefresh
实现。当我向下滑动列表时,它会刷新列表。我的问题是 fastScroll
。如果列表的第一个项目可见或位于初始顶部,则如果向下滚动 fastScrollThumb
,它会产生 Swipe
效果,而不是向下滚动。无论如何/解决方案,如果我按下 fastScrollThumb
,那么它不应该做 Swipe
刷新效果,而是应该向下滚 Action 为它的自然行为。
已编辑
我的 XML 布局
如下:
<?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"
android:background="@color/white" >
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent" >
<RelativeLayout
android:id="@+id/buttons_layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_marginTop="10dp">
<ImageView
android:id="@+id/SubmitButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/neoo_tab_selector" />
</RelativeLayout>
<ListView
android:id="@id/android:list"
style="@style/NeeoContactListView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@+id/buttons_layout"
android:layout_marginTop="10dp" />
</RelativeLayout>
</android.support.v4.widget.SwipeRefreshLayout>
我用于启用/禁用 SwipeRefresh
的onScroll 逻辑
是:
getListView().setOnScrollListener(new OnScrollListener() {
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
boolean enable = false;
if(getListView() != null && getListView().getChildCount() > 0){
// check if the first item of the list is visible
boolean firstItemVisible = getListView().getFirstVisiblePosition() == 0;
// check if the top of the first item is visible
boolean topOfFirstItemVisible = getListView().getChildAt(0).getTop() == 0;
// enabling or disabling the refresh layout
enable = firstItemVisible && topOfFirstItemVisible;
}
if(enable){
enableSwipe();
}else{
disableSwipe();
}
}
});
最佳答案
我刚刚查看了 the documentation SwipeRefreshLayout
的,我认为他们提到了您正在寻找的内容:
... If the listener determines there should not be a refresh, it must call
setRefreshing(false)
to cancel any visual indication of a refresh. If an activity wishes to show just the progress animation, it should callsetRefreshing(true)
. To disable the gesture and progress animation, callsetEnabled(false)
on the view.
所以你有几个选择,我会首先尝试使用 setEnabled()
或 setRefreshing()
,但要正确使用这些方法,我们首先需要能够检测 ListView
是否正在快速滚动。没有用于快速滚动的监听器或任何东西,但您可以通过反射获取状态!基于this excellent and seriously underrated answer我写了一个 FastScrollListener
,它可以像 OnScrollListener
一样使用:
this.listView.setFastScrollEnabled(true);
this.listView.setOnScrollListener(new FastScrollListener(this.listView) {
@Override
protected void onFastScrollStateChanged(AbsListView view, FastScrollState state) {
// This line disabled the SwipeRefreshLayout
// whenever the user is fast scrolling
swipeRefreshLayout.setEnabled(state != FastScrollState.DRAGGING);
}
@Override
protected void onFastScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
}
});
如果 setEnabled()
不起作用,您也可以尝试调用 setRefreshing()
而不是 setEnabled()
。
这里是FastScrollListener
的代码:
public abstract class FastScrollListener implements AbsListView.OnScrollListener {
private final int STATE_DRAGGING;
private final int STATE_VISIBLE;
private final int STATE_NONE;
public enum FastScrollState {
DRAGGING,
VISIBLE,
NONE,
UNKNOWN
}
private FastScrollState fastScrollState = FastScrollState.UNKNOWN;
private Field stateField;
private Object mFastScroller;
public FastScrollListener(AbsListView listView) {
try {
final Field fastScrollerField = AbsListView.class.getDeclaredField("mFastScroller");
fastScrollerField.setAccessible(true);
mFastScroller = fastScrollerField.get(listView);
final Field stateDraggingField = mFastScroller.getClass().getDeclaredField("STATE_DRAGGING");
stateDraggingField.setAccessible(true);
STATE_DRAGGING = stateDraggingField.getInt(mFastScroller);
final Field stateVisibleField = mFastScroller.getClass().getDeclaredField("STATE_VISIBLE");
stateVisibleField.setAccessible(true);
STATE_VISIBLE = stateVisibleField.getInt(mFastScroller);
final Field stateNoneField = mFastScroller.getClass().getDeclaredField("STATE_NONE");
stateNoneField.setAccessible(true);
STATE_NONE = stateNoneField.getInt(mFastScroller);
stateField = mFastScroller.getClass().getDeclaredField("mState");
stateField.setAccessible(true);
fastScrollState = getFastScrollState();
} catch (NoSuchFieldException e) {
throw new IllegalStateException("Could not find required fields for fast scroll detection!", e);
} catch (IllegalAccessException e) {
throw new IllegalStateException("Could not find required fields for fast scroll detection!", e);
}
}
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
updateFastScrollState(view);
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
updateFastScrollState(view);
updateFastScroll(view, firstVisibleItem, visibleItemCount, totalItemCount);
}
private void updateFastScrollState(AbsListView view) {
if (stateField != null) {
final FastScrollState state = getFastScrollState();
if (fastScrollState != state) {
fastScrollState = state;
onFastScrollStateChanged(view, state);
}
}
}
private void updateFastScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
if(fastScrollState == FastScrollState.DRAGGING) {
onFastScroll(view, firstVisibleItem, visibleItemCount, totalItemCount);
}
}
private FastScrollState getFastScrollState() {
try {
final int state = stateField.getInt(mFastScroller);
if (state == STATE_DRAGGING) {
return FastScrollState.DRAGGING;
}
if (state == STATE_VISIBLE) {
return FastScrollState.VISIBLE;
}
if (state == STATE_NONE) {
return FastScrollState.NONE;
}
return FastScrollState.UNKNOWN;
} catch (IllegalAccessException e) {
throw new IllegalStateException("Could not read fast scroll state!", e);
}
}
protected abstract void onFastScrollStateChanged(AbsListView view, FastScrollState state);
protected abstract void onFastScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount);
}
希望能帮到您,如果您还有其他问题,请随时提问!
编辑:试试这个,但我怀疑它是否有效:
@Override
protected void onFastScrollStateChanged(AbsListView view, FastScrollState state) {
boolean enable = false;
if (getListView().getChildCount() > 0) {
boolean firstItemVisible = getListView().getFirstVisiblePosition() == 0;
boolean topOfFirstItemVisible = getListView().getChildAt(0).getTop() == 0;
enable = firstItemVisible && topOfFirstItemVisible;
}
refreshLayout.setEnabled(enable);
}
关于android - 在 android 中快速滚动时避免滑动刷新,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/24863038/