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在使用 snaphelper这个类的时候,好多时候会抛出一个异常"illegalstateexception an instance of
onflinglistener already set".
java.lang.IllegalStateException: An instance of OnFlingListener already set.
at android.support.v7.widget.SnapHelper.setupCallbacks(SnapHelper.java:114)
at android.support.v7.widget.SnapHelper.attachToRecyclerView(SnapHelper.java:102)
at com.abc.ui.trm.TrCard.setupCardView(TrCard.java:62)
at com.abc.ui.trm.TrCard.setupCardView(TrCard.java:29)
at com.abc.ui.core.card.BaseCardView.processCardView(BaseCardView.java:134)
at com.abc.ui.card.CardRecyclerAdapter.onViewAttachedToWindow(CardRecyclerAdapter.java:398)
at android.support.v7.widget.RecyclerView.dispatchChildAttached(RecyclerView.java:6758)
at android.support.v7.widget.RecyclerView$5.addView(RecyclerView.java:696)
at android.support.v7.widget.ChildHelper.addView(ChildHelper.java:107)。。。。。。等等
在源码中可以看到
private void setupCallbacks() throws IllegalStateException {
if (mRecyclerView.getOnFlingListener() != null) {
throw new IllegalStateException("An instance of OnFlingListener already set.");
}
mRecyclerView.addOnScrollListener(mScrollListener);
mRecyclerView.setOnFlingListener(this);
}
直接说解决办法:
在
snapHelper.attachToRecyclerView(recyList)
之前加上一句代码:
recycler.setOnFlingListener(null);
大功告成