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我正在尝试使用Scala开发Android应用程序。当从非活动调用时,findViewById返回null
当我的应用程序启动就立即显示一个对话框,如下所示:
override def onCreate(savedInstanceState: Bundle) {
super.onCreate(savedInstanceState)
competitionSetupDialogFragment.show(getFragmentManager(), HomeScreenActivity.CompetitionDialog)
}
override def onStart() {
super.onStart
resourceHelper.setActivity(this)
}
我的片段如下:
class CompetitionSetupDialogFragment extends DialogFragment {
@Inject
var competitionSetupDialogHandler: CompetitionSetupDialogHandler = null
@Inject
var resourceHelper: ResourceHelper = null
override def onCreateDialog(savedInstanceState: Bundle): Dialog = {
val builder = new AlertDialog.Builder(getActivity())
builder.setMessage(getString(R.string.competitionSetupDialogMessage))
.setCancelable(false)
.setView(getActivity().getLayoutInflater.inflate(R.layout.competition_setup, null))
.setNegativeButton(R.string.cancel, new OnClickListener {
def onClick(dialog: DialogInterface, which: Int) {
dismiss()
}
})
.setPositiveButton(R.string.create, new OnClickListener {
def onClick(dialog: DialogInterface, which: Int) {
val competitionNameInput = resourceHelper.findViewById(R.id.competitionNameInput).asInstanceOf[EditText]
val numberOfPlayersInput = resourceHelper.findViewById(R.id.numberOfPlayersInput).asInstanceOf[EditText]
val numberOfSubsInput = resourceHelper.findViewById(R.id.numberOfSubsInput).asInstanceOf[EditText]
val lengthOfHalfInput = resourceHelper.findViewById(R.id.lengthOfHalfInput).asInstanceOf[EditText]
competitionSetupDialogHandler.retrieveValuesAndSave(competitionNameInput, numberOfPlayersInput, numberOfSubsInput, lengthOfHalfInput)
}
})
builder.create()
}
}
最后,ResourceHelper包含以下内容:
public View findViewById(int viewID) {
return activity.findViewById(viewID);
}
我的问题是,我的resourceHelper.findViewById总是返回null,即使这些都是有效的观点。
我的想法是,在onClick()被调用时,视图已被销毁,或类似的东西。 我该如何解决这个问题?
这里有一点要补充的是,我的对话框显示细腻,只有当onClick函数执行,我已经解决了这个问题