【发布时间】：2021-08-28 12:35:24
【问题描述】：
在添加 setFragmentResultListener 后，我使用它来将从另一个片段获取的数据添加到表中，我得到以下 logcat 错误：
2021-06-11 16:45:13.689 29090-29090/com.example.nlp_expense_tracker E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.nlp_expense_tracker, PID: 29090
java.lang.IllegalStateException: Fragment HistoryFragment{dcdb784} (1d63faf6-f003-4a57-a9ee-a3ea2331063e id=0x7f0901bb tag=android:switcher:2131296699:1) did not return a View from onCreateView() or this was called before onCreateView().
at androidx.fragment.app.Fragment.requireView(Fragment.java:1964)
at com.example.nlp_expense_tracker.fragments.HistoryFragment.onCreate(HistoryFragment.kt:30)
我也尝试在 onCreate 函数中添加表格部分的代码，但我得到了同样的错误。
这是我的片段代码： 如果有一种方法可以更简单地编写此代码，我也总是愿意接受建议。 刚开始学习编程。
class HistoryFragment : Fragment() {
private val dataStore = ArrayList<String>()
private val dataAmount = ArrayList<String>()
private val dataDate = ArrayList<String>()
private lateinit var textview2: TextView
private lateinit var textView3: TextView
private lateinit var textView4: TextView
private lateinit var store: TextView
private lateinit var amount: TextView
private lateinit var date: TextView
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
}
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,savedInstanceState: Bundle?):
View {val view: View = inflater.inflate(R.layout.fragment_history, container, false)
textview2 = view.findViewById(R.id.textView2)
textView3 = view.findViewById(R.id.textView3)
textView4 = view.findViewById(R.id.textView4)
val table : TableLayout = requireView().findViewById(R.id.tableHistorie)
val row : TableRow = requireView().findViewById(R.id.tableRowOne)
// Use the Kotlin extension in the fragment-ktx artifact
setFragmentResultListener("requestKey") { requestKey, bundle ->
// We use a String here, but any type that can be put in a Bundle is supported
val result = bundle.getString("bundleKey")
dataStore.add(result.toString())
for(i in dataStore.indices)
{
val storeName = dataStore [i]
store.text = storeName
}
row.addView(store)
table.addView(row)
}
setFragmentResultListener("requestKey2") { requestKey, bundle ->
// We use a String here, but any type that can be put in a Bundle is supported
val result2 = bundle.getString("bundleKey2")
// Do something with the result
dataAmount.add(result2.toString())
for(i in dataAmount.indices)
{
val storeName = dataAmount [i]
amount.text = storeName
}
row.addView(amount)
table.addView(row)
}
setFragmentResultListener("requestKey3") { requestKey, bundle ->
// We use a String here, but any type that can be put in a Bundle is supported
val result3 = bundle.getString("bundleKey3")
// Do something with the result
dataDate.add(result3.toString())
for(i in dataDate.indices)
{
val storeName = dataDate [i]
date.text = storeName
}
row.addView(date)
table.addView(row)
}
return view
}
}
【问题讨论】：
标签： android kotlin fragment illegalstateexception