Question

我不知道是什么导致错误。这是我第一次使用导航。请帮我。首先，从底部导航中输入活动。然后，错误代码是“致命异常：主要：

Process: com.example.manager1, PID: 9184
java.lang.IllegalStateException: ~~
 View does not have a NavController set "

它是在访问新活动（家庭）时发生的。

这是我的导航图：

<?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/nav_graph_household" 
app:startDestination="@+id/HouseholdFragment"> 

<!-- HouseholdFragment --> 

<fragment android:id="@+id/HouseholdFragment"
android:name="com.example.manager1.navigation.
HouseholdFragment" 
android:label="fragment_household" 
tools:layout="@layout/fragment_household" > 

<action 
android:id="@+id/action_HouseholdFragment_to_
ViewBalanceFragment" 
app:destination="@id/ViewBalanceFragment" />

<action 
android:id="@+id/action_HouseholdFragment_to_
ViewAnalysisFragment"
app:destination="@id/ViewAnalysisFragment" /> 

</fragment> 

 <!-- ViewBalanceFragment -->

 <fragment android:id="@+id/ViewBalanceFragment" ` 
 android:name="com.example.manager1.navigation.
 ViewBalanceFragment"
 android:label="fragment_view_balance" 
 tools:layout="@layout/fragment_view_balance" >
 </fragment>

<!-- ViewAnalysisFragment -->

<fragment android:id="@+id/ViewAnalysisFragment" 
android:name="com.example.manager1.navigation.
ViewAnalysisFragment"
android:label="fragment_view_analysis" 

</fragment>

</navigation>

这是我的片段（kotlin）

class HouseholdFragment : Fragment(),View.OnClickListener 
{

lateinit var navController: NavController
......

override fun onViewCreated(view: View, savedInstanceState: 
Bundle?) {
super.onViewCreated(view, savedInstanceState)
 navController = Navigation.findNavController(view)
 view.findViewById<Button> 
(R.id.view_balance_btn).setOnClickListener(this)
 view.findViewById<Button> 
(R.id.view_analysis_btn).setOnClickListener(this)
    }

这是我的主要活动

open class MainActivity : AppCompatActivity() 
,BottomNavigationView.OnNavigationItemSelectedListener {
override fun onNavigationItemSelected(p0: MenuItem): 
Boolean {
 when (p0.itemId) {
...
 R.id.action_houeshold -> {
 var householdFragment = HouseholdFragment()
  supportFragmentManager.beginTransaction()
 .replace(R.id.main_content, householdFragment).commit()
 startActivity(Intent(this, 
HouseholdActivity::class.java))
 finish()

 return true
...
}

这是我的manifest.xml

 <activity
  android:name=".LoadingActivity"
  android:theme="@style/LoadingTheme" >
 <intent-filter>
 <action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" 
 />
 </intent-filter>

</activity>

 <activity android:name=".MainActivity">
 </activity>
 <activity android:name=".HouseholdActivity">

 </activity>

因此，HouseholdActivity刚刚设置了ContentContentview（R.layout.actvitiy_household）

致命异常：视图未设置NavController（使用导航和BottomNavigation）

0 个答案: