android - ListViewAutoScrollHelper.canTargetScrollVertically处的NullPointerException(ListViewAutoScrollHelper.java:73)

Question

我在Google Play控制台中有错误报告。
在此堆栈跟踪中没有找到我的代码的任何一行-因此，我不了解此崩溃的根源。
有谁能够帮助我？

昨天上午6:56在应用程序版本158上
三星Galaxy A50(a50)，3840MB RAM，Android 10
报告3之1

java.lang.NullPointerException: 
  at androidx.core.widget.ListViewAutoScrollHelper.canTargetScrollVertically (ListViewAutoScrollHelper.java:73)
  at androidx.core.widget.AutoScrollHelper.shouldAnimate (AutoScrollHelper.java:506)
  at androidx.core.widget.AutoScrollHelper.onTouch (AutoScrollHelper.java:485)
  at androidx.appcompat.widget.DropDownListView.onForwardedEvent (DropDownListView.java:529)
  at androidx.appcompat.widget.ForwardingListener.onTouchForwarded (ForwardingListener.java:276)
  at androidx.appcompat.widget.ForwardingListener.onTouch (ForwardingListener.java:97)
  at androidx.appcompat.widget.AppCompatSpinner.onTouchEvent (AppCompatSpinner.java:420)
  at android.view.View.dispatchTouchEvent (View.java:14376)
  at android.view.ViewGroup.dispatchTransformedTouchEvent (ViewGroup.java:3857)
  at android.view.ViewGroup.dispatchTouchEvent (ViewGroup.java:3535)
  at android.view.ViewGroup.dispatchTransformedTouchEvent (ViewGroup.java:3863)
  at android.view.ViewGroup.dispatchTouchEvent (ViewGroup.java:3551)
  at android.view.ViewGroup.dispatchTransformedTouchEvent (ViewGroup.java:3863)
  at android.view.ViewGroup.dispatchTouchEvent (ViewGroup.java:3551)
  at android.view.ViewGroup.dispatchTransformedTouchEvent (ViewGroup.java:3863)
  at android.view.ViewGroup.dispatchTouchEvent (ViewGroup.java:3551)
  at android.view.ViewGroup.dispatchTransformedTouchEvent (ViewGroup.java:3863)
  at android.view.ViewGroup.dispatchTouchEvent (ViewGroup.java:3551)
  at android.view.ViewGroup.dispatchTransformedTouchEvent (ViewGroup.java:3863)
  at android.view.ViewGroup.dispatchTouchEvent (ViewGroup.java:3551)
  at android.view.ViewGroup.dispatchTransformedTouchEvent (ViewGroup.java:3863)
  at android.view.ViewGroup.dispatchTouchEvent (ViewGroup.java:3551)
  at android.view.ViewGroup.dispatchTransformedTouchEvent (ViewGroup.java:3863)
  at android.view.ViewGroup.dispatchTouchEvent (ViewGroup.java:3551)
  at android.view.ViewGroup.dispatchTransformedTouchEvent (ViewGroup.java:3863)
  at android.view.ViewGroup.dispatchTouchEvent (ViewGroup.java:3551)
  at android.view.ViewGroup.dispatchTransformedTouchEvent (ViewGroup.java:3863)
  at android.view.ViewGroup.dispatchTouchEvent (ViewGroup.java:3551)
  at android.view.ViewGroup.dispatchTransformedTouchEvent (ViewGroup.java:3863)
  at android.view.ViewGroup.dispatchTouchEvent (ViewGroup.java:3551)
  at android.view.ViewGroup.dispatchTransformedTouchEvent (ViewGroup.java:3863)
  at android.view.ViewGroup.dispatchTouchEvent (ViewGroup.java:3551)
  at android.view.ViewGroup.dispatchTransformedTouchEvent (ViewGroup.java:3863)
  at android.view.ViewGroup.dispatchTouchEvent (ViewGroup.java:3551)
  at com.android.internal.policy.DecorView.superDispatchTouchEvent (DecorView.java:729)
  at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent (PhoneWindow.java:1922)
  at android.app.Activity.dispatchTouchEvent (Activity.java:4051)
  at androidx.appcompat.view.WindowCallbackWrapper.dispatchTouchEvent (WindowCallbackWrapper.java:69)
  at androidx.appcompat.view.WindowCallbackWrapper.dispatchTouchEvent (WindowCallbackWrapper.java:69)
  at com.android.internal.policy.DecorView.dispatchTouchEvent (DecorView.java:687)
  at android.view.View.dispatchPointerEvent (View.java:14644)
  at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent (ViewRootImpl.java:6522)
  at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess (ViewRootImpl.java:6309)
  at android.view.ViewRootImpl$InputStage.deliver (ViewRootImpl.java:5747)
  at android.view.ViewRootImpl$InputStage.onDeliverToNext (ViewRootImpl.java:5800)
  at android.view.ViewRootImpl$InputStage.forward (ViewRootImpl.java:5766)
  at android.view.ViewRootImpl$AsyncInputStage.forward (ViewRootImpl.java:5922)
  at android.view.ViewRootImpl$InputStage.apply (ViewRootImpl.java:5774)
  at android.view.ViewRootImpl$AsyncInputStage.apply (ViewRootImpl.java:5979)
  at android.view.ViewRootImpl$InputStage.deliver (ViewRootImpl.java:5747)
  at android.view.ViewRootImpl$InputStage.onDeliverToNext (ViewRootImpl.java:5800)
  at android.view.ViewRootImpl$InputStage.forward (ViewRootImpl.java:5766)
  at android.view.ViewRootImpl$InputStage.apply (ViewRootImpl.java:5774)
  at android.view.ViewRootImpl$InputStage.deliver (ViewRootImpl.java:5747)
  at android.view.ViewRootImpl.deliverInputEvent (ViewRootImpl.java:8906)
  at android.view.ViewRootImpl.doProcessInputEvents (ViewRootImpl.java:8767)
...

Answer 1

您可以像这样检查您的代码吗？

final ListView list = (ListView) findViewById(android.R.id.list);
final ListViewAutoScrollHelper scrollHelper = new ListViewAutoScrollHelper(list);
scrollHelper.setEnabled(true);
list.setOnTouchListener(scrollHelper);

并发布您的ListViewAutoScrollHelper代码