清空back stack后跳转 #15

wsdydeni · 2022-01-18T05:38:21Z

在看了这篇文章之后，里面有一个写法，目标是和标题一样，行为应该是切换了navigation和startDestination。

<?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"
    android:id="@+id/main_navigation"
    app:startDestination="@id/home_fragment">
    <action
        android:id="@+id/action_login"
        app:destination="@+id/login_navigation"
        app:popUpTo="@id/main_navigation"
        app:popUpToInclusive="true"
        app:launchSingleTop="true"/>
    <fragment
        android:id="@+id/home_fragment"
        android:name="com.example.HomeFragment" />
    <navigation
        android:id="@+id/login_navigation"
        app:startDestination="@id/login_fragment">
        <fragment
            android:id="@+id/login_fragment"
            android:name="com.example.LoginFragment" />
    </navigation>
</navigation>

结果发生了问题，对大佬的严格深有感悟，受制于自身水平，实在没办法探索。

2022-01-18 12:22:03.157 E/AndroidRuntime: FATAL EXCEPTION: main
Process: , PID: 16247
java.lang.RuntimeException: Unable to start activity ComponentInfo{/*******.module.main.mine.bankcard.BankCardManagerActivity}: java.lang.UnsupportedOperationException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2877)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2938)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1652)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6441)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:939)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:829)
Caused by: java.lang.UnsupportedOperationException
at java.util.AbstractList.remove(AbstractList.java:161)
at androidx.navigation.fragment.FragmentNavigator.popBackStack(FragmentNavigator.java:109)
at androidx.navigation.NavController.popBackStackInternal(NavController.java:323)
at androidx.navigation.NavController.navigate(NavController.java:1059)
at androidx.navigation.NavController.navigate(NavController.java:944)
at androidx.navigation.NavController.navigate(NavController.java:877)
at androidx.navigation.NavController.navigate(NavController.java:863)
at androidx.navigation.NavController.navigate(NavController.java:851)
at **************.module.main.mine.bankcard.BankCardManagerActivity.initView(BankCardManagerActivity.kt:30)
at com.wsdydeni.baselib.base.BaseActivity.onCreate(BaseActivity.kt:46)
at android.app.Activity.performCreate(Activity.java:6782)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2825)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2938)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1652)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6441)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:939)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:829)

具体是 FragmentNavigator.java:109

boolean isSingleTopReplacement = navOptions != null && !initialNavigation && navOptions.shouldLaunchSingleTop() && (Integer)this.mBackStack.peekLast() == destId;

The text was updated successfully, but these errors were encountered:

bananaCaptain · 2022-08-09T11:16:23Z

出现了一样的报错，需求是在启动一个activity时动态判断设置 setStartDestination（），如果在oncreate就报上面的错，如果是onstart（）就同过，个人理解是初始化未完成就开始清理栈。问题是之前的项目没有出现。

override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
// val binding = ActivityMainBinding.inflate(layoutInflater)
// setContentView(binding.root)
setContentView(R.layout.activity_main)
initNavGraph()
}

override fun onStart() {
    super.onStart()
    initNavGraph()
}


private fun initNavGraph() {
    val navHostFragment =
        supportFragmentManager.findFragmentById(R.id.nav_host_main) as NavHostFragment
    navHostFragment.navController
    val navController = navHostFragment.navController
    val navMainGraph = navController.navInflater.inflate(R.navigation.nav_main)
    //TODO 数据不应该直接出现在UI，这个模式数据应该放在 ShareViewModel 中 区局多次使用
    //判断是否已经选择了指定对讲模式，如果没有选择就显示选择对讲模式页，如果已经存在，直接进入对应的对讲主页
    val selectcallModeInt = AppConfigs.selectCallModeKVI.get()
    val startDestinationId = if (selectcallModeInt == -1) {
        R.id.selectModeFragment
    } else {

// R.id.homeFragment
R.id.selectModeFragment
}
navMainGraph.setStartDestination(startDestinationId)
navController.graph = navMainGraph

wsdydeni · 2022-08-09T11:19:34Z

出现了一样的报错，需求是在启动一个activity时动态判断设置 setStartDestination（），如果在oncreate就报上面的错，如果是onstart（）就同过，个人理解是初始化未完成就开始清理栈。问题是之前的项目没有出现。

override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) // val binding = ActivityMainBinding.inflate(layoutInflater) // setContentView(binding.root) setContentView(R.layout.activity_main) initNavGraph() }
override fun onStart() {
    super.onStart()
    initNavGraph()
}


private fun initNavGraph() {
    val navHostFragment =
        supportFragmentManager.findFragmentById(R.id.nav_host_main) as NavHostFragment
    navHostFragment.navController
    val navController = navHostFragment.navController
    val navMainGraph = navController.navInflater.inflate(R.navigation.nav_main)
    //TODO 数据不应该直接出现在UI，这个模式数据应该放在 ShareViewModel 中 区局多次使用
    //判断是否已经选择了指定对讲模式，如果没有选择就显示选择对讲模式页，如果已经存在，直接进入对应的对讲主页
    val selectcallModeInt = AppConfigs.selectCallModeKVI.get()
    val startDestinationId = if (selectcallModeInt == -1) {
        R.id.selectModeFragment
    } else {
// R.id.homeFragment R.id.selectModeFragment } navMainGraph.setStartDestination(startDestinationId) navController.graph = navMainGraph
}

兄弟你需要换种写法来获取NavController

bananaCaptain · 2022-08-09T12:20:45Z

出现了一样的报错，需求是在启动一个activity时动态判断设置 setStartDestination（），如果在oncreate就报上面的错，如果是onstart（）就同过，个人理解是初始化未完成就开始清理栈。问题是之前的项目没有出现。
override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) // val binding = ActivityMainBinding.inflate(layoutInflater) // setContentView(binding.root) setContentView(R.layout.activity_main) initNavGraph() }
override fun onStart() {
    super.onStart()
    initNavGraph()
}


private fun initNavGraph() {
    val navHostFragment =
        supportFragmentManager.findFragmentById(R.id.nav_host_main) as NavHostFragment
    navHostFragment.navController
    val navController = navHostFragment.navController
    val navMainGraph = navController.navInflater.inflate(R.navigation.nav_main)
    //TODO 数据不应该直接出现在UI，这个模式数据应该放在 ShareViewModel 中 区局多次使用
    //判断是否已经选择了指定对讲模式，如果没有选择就显示选择对讲模式页，如果已经存在，直接进入对应的对讲主页
    val selectcallModeInt = AppConfigs.selectCallModeKVI.get()
    val startDestinationId = if (selectcallModeInt == -1) {
        R.id.selectModeFragment
    } else {
// R.id.homeFragment R.id.selectModeFragment } navMainGraph.setStartDestination(startDestinationId) navController.graph = navMainGraph
}
兄弟你需要换种写法来获取NavController

具体怎么写？麻烦了

bananaCaptain · 2022-08-09T12:21:15Z

class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
lifecycleScope.launch {
//如果不加延迟就报错，加了就正常了
//java.lang.UnsupportedOperationException
// at java.util.AbstractList.remove(AbstractList.java:161)
// at androidx.navigation.fragment.FragmentNavigator.popBackStack(FragmentNavigator.java:109)
// delay(2)
initNavGraph()
}
}

private fun initNavGraph() {
    val navHostFragment =
        supportFragmentManager.findFragmentById(R.id.nav_host_main) as NavHostFragment
    val navController = navHostFragment.navController
    val navMainGraph = navController.navInflater.inflate(R.navigation.nav_main)
    navMainGraph.setStartDestination(R.id.homeFragment)
    navController.graph = navMainGraph
}

}
延迟 1微秒就不报错了

bananaCaptain · 2022-08-09T12:33:41Z

换了Navigation.findNavController 也是一样，延迟1毫秒就不报错，不延迟就报错，不知道有正解不？麻烦了
private fun initNavGraph2() {
val navController = Navigation.findNavController(this, R.id.nav_host_main)
val navMainGraph = navController.navInflater.inflate(R.navigation.nav_main)
navMainGraph.setStartDestination(R.id.homeFragment)
navController.graph = navMainGraph
}

wsdydeni · 2022-08-09T12:46:23Z

给你翻了下代码

        val navHostFragment = supportFragmentManager
            .findFragmentById(R.id.nav_host_fragment_bankcard) as NavHostFragment
        val navController = NavHostFragment.findNavController(navHostFragment)
        val bankCardCount = intent?.getIntExtra("bankCardCount",0)
        navController.setGraph(
            if(bankCardCount == 0) R.navigation.nav_bankcard_add
            else R.navigation.nav_bankcard,
            // 没有银行卡时，添加银行卡界面直接退出
            if(bankCardCount == 0) Bundle().apply { putBoolean("isReturnList",false) }
            else null
        )

<?xml version="1.0" encoding="utf-8"?>
<androidx.fragment.app.FragmentContainerView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/nav_host_fragment_bankcard"
    android:name="androidx.navigation.fragment.NavHostFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:defaultNavHost="true"
    />

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清空back stack后跳转 #15

清空back stack后跳转 #15

wsdydeni commented Jan 18, 2022

bananaCaptain commented Aug 9, 2022

wsdydeni commented Aug 9, 2022

bananaCaptain commented Aug 9, 2022

bananaCaptain commented Aug 9, 2022

bananaCaptain commented Aug 9, 2022

wsdydeni commented Aug 9, 2022 •

edited

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清空back stack后跳转 #15

清空back stack后跳转 #15

Comments

wsdydeni commented Jan 18, 2022

bananaCaptain commented Aug 9, 2022

wsdydeni commented Aug 9, 2022

bananaCaptain commented Aug 9, 2022

bananaCaptain commented Aug 9, 2022

bananaCaptain commented Aug 9, 2022

wsdydeni commented Aug 9, 2022 • edited Loading

wsdydeni commented Aug 9, 2022 •

edited

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