Invoking method on null reference kotlin extensions

huangapple
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英文:

Invoking method on null reference kotlin extensions

问题

我在我的碎片中遇到了一个非常奇怪的错误：

  1. java.lang.NullPointerException: 尝试在空对象引用上调用虚拟方法 'void android.view.View.setOnClickListener(android.view.View$OnClickListener)' 
  2.         at com.halalrishtey.ProfessionalDetailsFragment.onViewCreated(ProfessionalDetailsFragment.kt:47)
  3.         at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:892)
  4.         at androidx.fragment.app.FragmentManagerImpl.addAddedFragments(FragmentManagerImpl.java:2100)
  5.         at androidx.fragment.app.FragmentManagerImpl.executeOpsTogether(FragmentManagerImpl.java:1874)
  6.         at androidx.fragment.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManagerImpl.java:1830)
  7.         at androidx.fragment.app.FragmentManagerImpl.execPendingActions(FragmentManagerImpl.java:1727)
  8.         at androidx.fragment.app.FragmentManagerImpl$2.run(FragmentManagerImpl.java:150)
  9.         at android.os.Handler.handleCallback(Handler.java:751)
  10.         at android.os.Handler.dispatchMessage(Handler.java:95)
  11.         at android.os.Looper.loop(Looper.java:154)
  12.         at android.app.ActivityThread.main(ActivityThread.java:6077)
  13.         at java.lang.reflect.Method.invoke(Native Method)
  14.         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)
  15.         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:756)

我在onViewCreated函数中通过kotlin-extensions访问按钮时出现了空引用的错误，代码如下：

  1. uploadAdhar_Button.setOnClickListener {
  2.     findNavController().navigate(R.id.action_professionalDetails_to_uploadImageFragment)
  3. }

之前是正常工作的，我不知道出了什么问题，请帮忙解决！

英文:

So, I'm getting a really weird error in my fragment:

  1. java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.View.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
  2.         at com.halalrishtey.ProfessionalDetailsFragment.onViewCreated(ProfessionalDetailsFragment.kt:47)
  3.         at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:892)
  4.         at androidx.fragment.app.FragmentManagerImpl.addAddedFragments(FragmentManagerImpl.java:2100)
  5.         at androidx.fragment.app.FragmentManagerImpl.executeOpsTogether(FragmentManagerImpl.java:1874)
  6.         at androidx.fragment.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManagerImpl.java:1830)
  7.         at androidx.fragment.app.FragmentManagerImpl.execPendingActions(FragmentManagerImpl.java:1727)
  8.         at androidx.fragment.app.FragmentManagerImpl$2.run(FragmentManagerImpl.java:150)
  9.         at android.os.Handler.handleCallback(Handler.java:751)
  10.         at android.os.Handler.dispatchMessage(Handler.java:95)
  11.         at android.os.Looper.loop(Looper.java:154)
  12.         at android.app.ActivityThread.main(ActivityThread.java:6077)
  13.         at java.lang.reflect.Method.invoke(Native Method)
  14.         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)
  15.         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:756)

I'm getting null reference on a button which I access inside onViewCreated function through kotlin-extensions like so:

  1. uploadAdhar_Button.setOnClickListener {
  2.     findNavController().navigate(R.id.action_professionalDetails_to_uploadImageFragment)
  3. }

It was working before, I don't know what went wrong please help!

答案1

得分: 1

去到ProfessionalDetailsFragment的import语句并导入正确的合成布局。它应该是由ProfessionalDetailsFragment充气的同一个xml。

我最好的猜测是uploadAdhar_Button的id也被另一个.xml文件中的某些其他视图使用！

  1. import kotlinx.android.synthetic.main.fragment_professional_details.*

同时删除未使用的.xml的另一个import语句。

英文:

Go to the import statements of ProfessionalDetailsFragment and import the correct synthetic. It should be the same xml which is inflated by ProfessionalDetailsFragment.

My best guess is that uploadAdhar_Button id is used by some other views in another .xml file too !

  1. import kotlinx.android.synthetic.main.fragment_professional_details.*

Also delete the other import statement of the unused .xml

huangapple
  • 本文由 发表于 2020年1月7日 01:42:21
  • 转载请务必保留本文链接：https://go.coder-hub.com/59616604.html
  • android
  • kotlin
  • nullpointerexception
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