Android 应用程序不会启动，也不会列出错误/警告。使用片段和问题似乎与 var args = ViewFragmentArgs
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【中文标题】Android 应用程序不会启动，也不会列出错误/警告。使用片段和问题似乎与 var args = ViewFragmentArgs【英文标题】：Android app won't start and doesn't list errors/warnings. Using fragments and issue seems to be with var args = ViewFragmentArgs 【发布时间】：2021-12-20 20:47:58 【问题描述】：我正在尝试构建一个如下所示的计算器应用程序： image of calculator
显示部分和键盘部分是独立的片段，键盘片段需要更新显示片段。
已根据 Jetpack 更新 gradle 文件，以实现安全 args 和导航。另外，我正在使用视图绑定，并且所有内容都已相应更新。
以下代码用于将信息发送到显示文件的片段键盘文件（我认为这部分没问题，但我可能对最后一行有问题，因为它将数据发送到显示文件 -> findNavController().navigate(KeysFragmentDirections.actionKeysFragmentToViewFragment(completeNumber)))
package com.test.cis2818_proj2.ui.main
import android.os.Bundle
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.navigation.fragment.findNavController
import com.test.cis2818_proj2.databinding.FragmentKeysBinding
class KeysFragment : Fragment()
private lateinit var binding: FragmentKeysBinding
var completeNumber = ""
var operand1 = 0.0f
var operand2 = 0.0f
var operation = ""
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View?
binding = FragmentKeysBinding.inflate(inflater)
binding.keysFragmentBt0.setOnClickListener createNumber("0")
binding.keysFragmentBt1.setOnClickListener createNumber("1")
binding.keysFragmentBt2.setOnClickListener createNumber("2")
binding.keysFragmentBt3.setOnClickListener createNumber("3")
binding.keysFragmentBt4.setOnClickListener createNumber("4")
binding.keysFragmentBt5.setOnClickListener createNumber("5")
binding.keysFragmentBt6.setOnClickListener createNumber("6")
binding.keysFragmentBt7.setOnClickListener createNumber("7")
binding.keysFragmentBt8.setOnClickListener createNumber("8")
binding.keysFragmentBt9.setOnClickListener createNumber("9")
binding.keysFragmentBtDot.setOnClickListener createNumber(".")
return binding.root
private fun createNumber(stringNum: String)
if (completeNumber == "" && stringNum == ".")
completeNumber = "0"
if (completeNumber == "" && stringNum == "0")
completeNumber = ""
else
completeNumber += stringNum
binding.keysFragmentTvTester.text = completeNumber
findNavController().navigate(KeysFragmentDirections.actionKeysFragmentToViewFragment(completeNumber))
这是显示文件的所有代码：
package com.test.cis2818_proj2.ui.main
import android.os.Bundle
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import com.test.cis2818_proj2.databinding.FragmentViewBinding
class ViewFragment : Fragment()
private lateinit var binding: FragmentViewBinding
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View?
binding = FragmentViewBinding.inflate(inflater)
var args = ViewFragmentArgs.fromBundle(requireArguments())
binding.viewFragmentTvDisplay.text = args.displayData
return binding.root
问题似乎与以下代码有关：
var args = ViewFragmentArgs.fromBundle(requireArguments())
binding.viewFragmentTvDisplay.text = args.displayData
当我删除此代码时，应用程序运行并且看起来很好。使用应用程序中的代码，它根本无法启动并崩溃。
感谢任何帮助了解我的问题所在！
navigation.xml 代码如下：
<?xml version="1.0" encoding="utf-8"?>
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/navigation"
app:startDestination="@id/keysFragment">
<fragment
android:id="@+id/keysFragment"
android:name="com.test.cis2818_proj2.ui.main.KeysFragment"
android:label="fragment_keys"
tools:layout="@layout/fragment_keys" >
<action
android:id="@+id/action_keysFragment_to_viewFragment"
app:destination="@id/viewFragment" />
</fragment>
<fragment
android:id="@+id/viewFragment"
android:name="com.test.cis2818_proj2.ui.main.ViewFragment"
android:label="fragment_view"
tools:layout="@layout/fragment_view" >
<argument
android:name="display_data"
app:argType="string"
app:nullable="true" />
</fragment>
</navigation>
来自 logcat 的错误（不确定这是否与堆栈跟踪相同...抱歉）
2021-11-07 15:42:59.034 20955-20955/com.test.cis2818_proj2 E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.test.cis2818_proj2, PID: 20955
java.lang.IllegalStateException: Fragment ViewFragmentf3bb415 (4c06d0b7-8565-4b91-b844-7e691229f22c id=0x7f0a0106) does not have any arguments.
at androidx.fragment.app.Fragment.requireArguments(Fragment.java:748)
at com.test.cis2818_proj2.ui.main.ViewFragment.onCreateView(ViewFragment.kt:19)
at androidx.fragment.app.Fragment.performCreateView(Fragment.java:2963)
at androidx.fragment.app.FragmentStateManager.createView(FragmentStateManager.java:518)
at androidx.fragment.app.FragmentStateManager.moveToExpectedState(FragmentStateManager.java:282)
at androidx.fragment.app.FragmentStore.moveToExpectedState(FragmentStore.java:112)
at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1647)
at androidx.fragment.app.FragmentManager.dispatchStateChange(FragmentManager.java:3128)
at androidx.fragment.app.FragmentManager.dispatchActivityCreated(FragmentManager.java:3072)
at androidx.fragment.app.FragmentController.dispatchActivityCreated(FragmentController.java:251)
at androidx.fragment.app.FragmentActivity.onStart(FragmentActivity.java:502)
at androidx.appcompat.app.AppCompatActivity.onStart(AppCompatActivity.java:246)
at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1435)
at android.app.Activity.performStart(Activity.java:8018)
at android.app.ActivityThread.handleStartActivity(ActivityThread.java:3475)
at android.app.servertransaction.TransactionExecutor.performLifecycleSequence(TransactionExecutor.java:221)
at android.app.servertransaction.TransactionExecutor.cycleToPath(TransactionExecutor.java:201)
at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:173)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:97)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2066)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:223)
at android.app.ActivityThread.main(ActivityThread.java:7656)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
这里是main_activity.xml：
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_
android:layout_
android:layout_margin="5dp"
android:background="@color/desert_sand"
android:padding="10dp"
tools:context=".MainActivity">
<androidx.fragment.app.FragmentContainerView
android:id="@+id/main_activity_ct_view_fragment"
android:name="com.test.cis2818_proj2.ui.main.ViewFragment"
android:layout_
android:layout_
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:layout="@layout/fragment_view" />
<androidx.fragment.app.FragmentContainerView
android:id="@+id/fragmentContainerView2"
android:name="com.test.cis2818_proj2.ui.main.KeysFragment"
android:layout_
android:layout_
android:layout_marginTop="32dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/main_activity_ct_view_fragment"
app:layout_constraintVertical_bias="0.0"
tools:layout="@layout/fragment_keys" />
</androidx.constraintlayout.widget.ConstraintLayout>
这里是 MainActivity.kt：
package com.test.cis2818_proj2
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
class MainActivity : AppCompatActivity()
override fun onCreate(savedInstanceState: Bundle?)
super.onCreate(savedInstanceState)
setContentView(R.layout.main_activity)
另外，这里是 frament_keys.xml：
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_
android:layout_
android:background="@color/desert_sand"
tools:context=".ui.main.KeysFragment">
<Button
android:id="@+id/keys_fragment_bt_1"
android:layout_
android:layout_
android:backgroundTint="@color/rich_black_fogra_29"
android:fontFamily="@font/squada_one"
android:padding="5dp"
android:text="@string/button_1"
android:textAlignment="center"
android:textSize="24sp"
app:cornerRadius="20dp"
app:layout_constraintBottom_toBottomOf="@+id/keys_fragment_bt_clear_entry"
app:layout_constraintEnd_toStartOf="@+id/keys_fragment_bt_2"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toEndOf="@+id/keys_fragment_bt_clear_entry"
app:layout_constraintTop_toTopOf="@+id/keys_fragment_bt_clear_entry" />
<Button
android:id="@+id/keys_fragment_bt_2"
android:layout_
android:layout_
android:backgroundTint="@color/rich_black_fogra_29"
android:fontFamily="@font/squada_one"
android:padding="5dp"
android:text="@string/button_2"
android:textAlignment="center"
android:textSize="24sp"
app:cornerRadius="20dp"
app:layout_constraintBottom_toBottomOf="@+id/keys_fragment_bt_1"
app:layout_constraintEnd_toStartOf="@+id/keys_fragment_bt_3"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toEndOf="@+id/keys_fragment_bt_1"
app:layout_constraintTop_toTopOf="@+id/keys_fragment_bt_1" />
<Button
android:id="@+id/keys_fragment_bt_3"
android:layout_
android:layout_
android:backgroundTint="@color/rich_black_fogra_29"
android:fontFamily="@font/squada_one"
android:padding="5dp"
android:text="@string/button_3"
android:textAlignment="center"
android:textSize="24sp"
app:cornerRadius="20dp"
app:layout_constraintBottom_toBottomOf="@+id/keys_fragment_bt_2"
app:layout_constraintEnd_toStartOf="@+id/keys_fragment_bt_subtract"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toEndOf="@+id/keys_fragment_bt_2"
app:layout_constraintTop_toTopOf="@+id/keys_fragment_bt_2" />
<Button
android:id="@+id/keys_fragment_bt_8"
android:layout_
android:layout_
android:backgroundTint="@color/rich_black_fogra_29"
android:fontFamily="@font/squada_one"
android:padding="5dp"
android:text="@string/button_8"
android:textAlignment="center"
android:textSize="24sp"
app:cornerRadius="20dp"
app:layout_constraintBottom_toBottomOf="@+id/keys_fragment_bt_7"
app:layout_constraintEnd_toStartOf="@+id/keys_fragment_bt_9"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toEndOf="@+id/keys_fragment_bt_7"
app:layout_constraintTop_toTopOf="@+id/keys_fragment_bt_7" />
<Button
android:id="@+id/keys_fragment_bt_mult"
android:layout_
android:layout_
android:backgroundTint="@color/dark_electric_blue"
android:fontFamily="@font/squada_one"
android:padding="5dp"
android:text="@string/button_multiply"
android:textAlignment="center"
android:textSize="24sp"
app:cornerRadius="20dp"
app:layout_constraintBottom_toBottomOf="@+id/keys_fragment_bt_6"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toEndOf="@+id/keys_fragment_bt_6"
app:layout_constraintTop_toTopOf="@+id/keys_fragment_bt_6" />
<Button
android:id="@+id/keys_fragment_bt_6"
android:layout_
android:layout_
android:backgroundTint="@color/rich_black_fogra_29"
android:fontFamily="@font/squada_one"
android:padding="5dp"
android:text="@string/button_6"
android:textAlignment="center"
android:textSize="24sp"
app:cornerRadius="20dp"
app:layout_constraintBottom_toBottomOf="@+id/keys_fragment_bt_5"
app:layout_constraintEnd_toStartOf="@+id/keys_fragment_bt_mult"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toEndOf="@+id/keys_fragment_bt_5"
app:layout_constraintTop_toTopOf="@+id/keys_fragment_bt_5" />
<Button
android:id="@+id/keys_fragment_bt_7"
android:layout_
android:layout_
android:backgroundTint="@color/rich_black_fogra_29"
android:fontFamily="@font/squada_one"
android:padding="5dp"
android:text="@string/button_7"
android:textAlignment="center"
android:textSize="24sp"
app:cornerRadius="20dp"
app:layout_constraintBottom_toBottomOf="@+id/keys_fragment_bt_modulus"
app:layout_constraintEnd_toStartOf="@+id/keys_fragment_bt_8"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toEndOf="@+id/keys_fragment_bt_modulus"
app:layout_constraintTop_toTopOf="@+id/keys_fragment_bt_modulus" />
<Button
android:id="@+id/keys_fragment_bt_div"
android:layout_
android:layout_
android:backgroundTint="@color/dark_electric_blue"
android:fontFamily="@font/squada_one"
android:padding="5dp"
android:text="@string/button_divide"
android:textAlignment="center"
android:textSize="24sp"
app:cornerRadius="20dp"
app:layout_constraintBottom_toBottomOf="@+id/keys_fragment_bt_9"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toEndOf="@+id/keys_fragment_bt_9"
app:layout_constraintTop_toTopOf="@+id/keys_fragment_bt_9" />
<Button
android:id="@+id/keys_fragment_bt_4"
android:layout_
android:layout_
android:backgroundTint="@color/rich_black_fogra_29"
android:fontFamily="@font/squada_one"
android:padding="5dp"
android:text="@string/button_4"
android:textAlignment="center"
android:textSize="24sp"
app:cornerRadius="20dp"
app:layout_constraintBottom_toBottomOf="@+id/keys_fragment_bt_sqrt"
app:layout_constraintEnd_toStartOf="@+id/keys_fragment_bt_5"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toEndOf="@+id/keys_fragment_bt_sqrt"
app:layout_constraintTop_toTopOf="@+id/keys_fragment_bt_sqrt" />
<Button
android:id="@+id/keys_fragment_bt_sqrt"
android:layout_
android:layout_
android:backgroundTint="@color/dark_electric_blue"
android:fontFamily="@font/squada_one"
android:padding="5dp"
android:text="@string/button_sqrt"
android:textAlignment="center"
android:textSize="20sp"
app:cornerRadius="20dp"
app:layout_constraintBottom_toTopOf="@+id/keys_fragment_bt_clear_entry"
app:layout_constraintEnd_toStartOf="@+id/keys_fragment_bt_4"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent" />
<Button
android:id="@+id/keys_fragment_bt_modulus"
android:layout_
android:layout_
android:backgroundTint="@color/dark_electric_blue"
android:fontFamily="@font/squada_one"
android:padding="5dp"
android:text="@string/button_modulus"
android:textAlignment="center"
android:textSize="24sp"
app:cornerRadius="20dp"
app:layout_constraintBottom_toTopOf="@+id/keys_fragment_bt_sqrt"
app:layout_constraintEnd_toStartOf="@+id/keys_fragment_bt_7"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent" />
<Button
android:id="@+id/keys_fragment_bt_5"
android:layout_
android:layout_
android:backgroundTint="@color/rich_black_fogra_29"
android:fontFamily="@font/squada_one"
android:padding="5dp"
android:text="@string/button_5"
android:textAlignment="center"
android:textSize="24sp"
app:cornerRadius="20dp"
app:layout_constraintBottom_toBottomOf="@+id/keys_fragment_bt_4"
app:layout_constraintEnd_toStartOf="@+id/keys_fragment_bt_6"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toEndOf="@+id/keys_fragment_bt_4"
app:layout_constraintTop_toTopOf="@+id/keys_fragment_bt_4" />
<Button
android:id="@+id/keys_fragment_bt_9"
android:layout_
android:layout_
android:backgroundTint="@color/rich_black_fogra_29"
android:fontFamily="@font/squada_one"
android:padding="5dp"
android:text="@string/button_9"
android:textAlignment="center"
android:textSize="24sp"
app:cornerRadius="20dp"
app:layout_constraintBottom_toBottomOf="@+id/keys_fragment_bt_8"
app:layout_constraintEnd_toStartOf="@+id/keys_fragment_bt_div"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toEndOf="@+id/keys_fragment_bt_8"
app:layout_constraintTop_toTopOf="@+id/keys_fragment_bt_8" />
<Button
android:id="@+id/keys_fragment_bt_dot"
android:layout_
android:layout_
android:backgroundTint="@color/rich_black_fogra_29"
android:fontFamily="@font/squada_one"
android:padding="5dp"
android:text="@string/button_dot"
android:textAlignment="center"
android:textSize="24sp"
app:cornerRadius="20dp"
app:layout_constraintBottom_toBottomOf="@+id/keys_fragment_bt_0"
app:layout_constraintEnd_toStartOf="@+id/keys_fragment_bt_neg_sign"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toEndOf="@+id/keys_fragment_bt_0"
app:layout_constraintTop_toTopOf="@+id/keys_fragment_bt_0" />
<Button
android:id="@+id/keys_fragment_bt_equals"
android:layout_
android:layout_
android:layout_marginStart="16dp"
android:layout_marginEnd="16dp"
android:backgroundTint="@color/dark_electric_blue"
android:fontFamily="@font/squada_one"
android:padding="5dp"
android:text="@string/button_equals"
android:textAlignment="center"
android:textSize="24sp"
app:cornerRadius="20dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/keys_fragment_bt_clear_all" />
<Button
android:id="@+id/keys_fragment_bt_add"
android:layout_
android:layout_
android:backgroundTint="@color/dark_electric_blue"
android:fontFamily="@font/squada_one"
android:padding="5dp"
android:text="@string/button_add"
android:textAlignment="center"
android:textSize="24sp"
app:cornerRadius="20dp"
app:layout_constraintBottom_toBottomOf="@+id/keys_fragment_bt_neg_sign"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toEndOf="@+id/keys_fragment_bt_neg_sign"
app:layout_constraintTop_toTopOf="@+id/keys_fragment_bt_neg_sign" />
<Button
android:id="@+id/keys_fragment_bt_clear_all"
android:layout_
android:layout_
android:backgroundTint="@color/dark_electric_blue"
android:fontFamily="@font/squada_one"
android:padding="5dp"
android:text="@string/button_clear_all"
android:textAlignment="center"
android:textSize="24sp"
app:cornerRadius="20dp"
app:layout_constraintEnd_toStartOf="@+id/keys_fragment_bt_0"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/keys_fragment_bt_clear_entry" />
<Button
android:id="@+id/keys_fragment_bt_0"
android:layout_
android:layout_
android:backgroundTint="@color/rich_black_fogra_29"
android:fontFamily="@font/squada_one"
android:padding="5dp"
android:text="@string/button_0"
android:textAlignment="center"
android:textSize="24sp"
app:cornerRadius="20dp"
app:layout_constraintBottom_toBottomOf="@+id/keys_fragment_bt_clear_all"
app:layout_constraintEnd_toStartOf="@+id/keys_fragment_bt_dot"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toEndOf="@+id/keys_fragment_bt_clear_all"
app:layout_constraintTop_toTopOf="@+id/keys_fragment_bt_clear_all" />
<Button
android:id="@+id/keys_fragment_bt_neg_sign"
android:layout_
android:layout_
android:backgroundTint="@color/rich_black_fogra_29"
android:fontFamily="@font/squada_one"
android:padding="5dp"
android:text="@string/button_neg_sign"
android:textAlignment="center"
android:textSize="24sp"
app:cornerRadius="20dp"
app:layout_constraintBottom_toBottomOf="@+id/keys_fragment_bt_dot"
app:layout_constraintEnd_toStartOf="@+id/keys_fragment_bt_add"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toEndOf="@+id/keys_fragment_bt_dot"
app:layout_constraintTop_toTopOf="@+id/keys_fragment_bt_dot" />
<Button
android:id="@+id/keys_fragment_bt_clear_entry"
android:layout_
android:layout_
android:backgroundTint="@color/dark_electric_blue"
android:fontFamily="@font/squada_one"
android:padding="5dp"
android:text="@string/button_clear_entry"
android:textAlignment="center"
android:textSize="24sp"
app:cornerRadius="20dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="@+id/keys_fragment_bt_1"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/keys_fragment_bt_subtract"
android:layout_
android:layout_
android:backgroundTint="@color/dark_electric_blue"
android:fontFamily="@font/squada_one"
android:padding="5dp"
android:text="@string/button_subtract"
android:textAlignment="center"
android:textSize="24sp"
app:cornerRadius="20dp"
app:layout_constraintBottom_toBottomOf="@+id/keys_fragment_bt_3"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toEndOf="@+id/keys_fragment_bt_3"
app:layout_constraintTop_toTopOf="@+id/keys_fragment_bt_3" />
<TextView
android:id="@+id/keys_fragment_tv_tester"
android:layout_
android:layout_
android:text="@string/tester"
android:textAlignment="center"
android:textSize="24sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/keys_fragment_bt_equals" />
</androidx.constraintlayout.widget.ConstraintLayout>
【问题讨论】：
那么崩溃信息是什么？请包含整个堆栈跟踪。 对不起，我是新来的。堆栈跟踪是 logcat 吗？ 是的，你得到了正确的堆栈跟踪。从该消息看来，您已直接或通过您的布局 XML 将ViewFragment 直接添加到您的 Activity 的 supportFragmentManager 中，与对 navigate() 的调用完全分开，这将用您的 @987654334 替换您的 KeysFragment @。那是你在做什么？能否包含您的活动代码和活动的布局 XML？
如果我理解你的问题...是的。我没有将 KeysFragment 替换为 ViewFragment，而是将两者都添加到 main_activity.xml 并尝试直接更新 ViewFragment。
【参考方案1】：
Navigation Component 涉及在您的 Activity 中使用单个 NavHostFragment 来确定需要使用导航图显示的片段。每次调用navigate() 都会用新片段替换当前片段。
您没有在活动 XML 中使用NavHostFragment，并且实际上不希望将一个片段替换为另一个片段。相反，您的两个片段是兄弟片段 - 两个独立添加的片段，它们都存在于您的活动布局中。这不是你会使用 Navigation、它的导航图或 Safe Args 的东西。
相反，您想Communicate between fragments using the Fragment Result API。此 API 专门用于在 Fragment 之间发送信息 - 例如在您的 ViewFragment 和 KeyFragment 之间。
这意味着您的 ViewFragment 看起来更像：
class ViewFragment : Fragment()
private lateinit var binding: FragmentViewBinding
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View?
binding = FragmentViewBinding.inflate(inflater)
// Uses the Kotlin extension available in fragment-ktx
setFragmentResultListener("keySelected") _, bundle ->
val displayData = bundle.getString("displayData")
binding.viewFragmentTvDisplay.text = args.displayData
return binding.root
您的KeysFragment 的createNumber 看起来更像：
private fun createNumber(stringNum: String)
if (completeNumber == "" && stringNum == ".")
completeNumber = "0"
if (completeNumber == "" && stringNum == "0")
completeNumber = ""
else
completeNumber += stringNum
binding.keysFragmentTvTester.text = completeNumber
// Uses the Kotlin extension in fragment-ktx
setFragmentResult("keySelected", bundleOf("displayData" to completeNumber))
【讨论】：
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