‘boolean android.view.View.canScrollVertically(int)‘ on a null object reference解决

本文介绍了一个关于SwipeRefreshLayout组件使用中出现的典型错误及其解决方法。该错误源于未正确包裹需要实现下拉刷新功能的控件。通过正确的包裹方式,可以确保SwipeRefreshLayout正常工作。

适用swiperefreshlayout 一直报这个错误后续后续检查发现没有将需要下拉刷新的控件包裹进去,包裹进去后运行正常

错误代码

正确适用方法

time E FATAL EXCEPTION: main Process: com.example.kucun2, PID: 27145 java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.view.GestureDetector.onTouchEvent(android.view.MotionEvent)' on a null object reference at com.example.kucun2.View.HorizontalScrollTextView.onTouchEvent(HorizontalScrollTextView.java:99) at android.view.View.performOnTouchCallback(View.java:16744) at android.view.View.dispatchTouchEvent(View.java:16620) at android.view.ViewGroup.dispatchTransformedTouchEventInternal(ViewGroup.java:3198) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3141) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2803) at android.view.ViewGroup.dispatchTransformedTouchEventInternal(ViewGroup.java:3198) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3141) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2803) at android.view.ViewGroup.dispatchTransformedTouchEventInternal(ViewGroup.java:3198) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3141) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2803) at android.view.ViewGroup.dispatchTransformedTouchEventInternal(ViewGroup.java:3198) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3141) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2803) at android.view.ViewGroup.dispatchTransformedTouchEventInternal(ViewGroup.java:3198) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3141) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2803) at android.view.ViewGroup.dispatchTransformedTouchEventInternal(ViewGroup.java:3198) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3141) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2803) at android.view.ViewGroup.dispatchTransformedTouchEventInternal(ViewGroup.java:3198) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3141) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2803) at android.view.ViewGroup.dispatchTransformedTouchEventInternal(ViewGroup.java:3198) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3141) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2803) at android.view.ViewGroup.dispatchTransformedTouchEventInternal(ViewGroup.java:3198) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3141) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2803) at android.view.ViewGroup.dispatchTransformedTouchEventInternal(ViewGroup.java:3198) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3141) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2803) at android.view.ViewGroup.dispatchTransformedTouchEventInternal(ViewGroup.java:3198) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3141) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2803) at android.view.ViewGroup.dispatchTransformedTouchEventInternal(ViewGroup.java:3198) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3141) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2803) at android.view.ViewGroup.dispatchTransformedTouchEventInternal(ViewGroup.java:3198) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3141) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2803) at android.view.ViewGroup.dispatchTransformedTouchEventInternal(ViewGroup.java:3198) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3141) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2803) at com.android.internal.policy.DecorView.superDispatchTouchEvent(DecorView.java:609) at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:2093) at android.app.Activity.dispatchTouchEvent(Activity.java:4790) 2025-06-06 18:18:26.085 12182-12182 AndroidRuntime E FATAL EXCEPTION: main Process: com.example.kucun2, PID: 12182 java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.String at com.example.kucun2.ui.dingdan.OrderDisplayFragment.addTableRow(OrderDisplayFragment.java:127) at com.example.kucun2.ui.dingdan.OrderDisplayFragment.fillTableData(OrderDisplayFragment.java:94) at com.example.kucun2.ui.dingdan.OrderDisplayFragment.onCreateView(OrderDisplayFragment.java:57)
06-08
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