TLDR：问题可以使用嵌套图来解决。有关详细信息，请参阅本文。
更长的答案
让我们定义简单的片段FragmentRed，FragmentGreen并FragmentBlue为每个简单的布局添加相应的背景颜色：
<?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"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/holo_red_dark">
<TextView
android:id="@+id/textView"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:gravity="center"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
并像这样声明片段类：
class FragmentRed : Fragment() {
private val args: FragmentRedArgs by navArgs()
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
val view = inflater.inflate(R.layout.red, container, false)
view.findViewById<TextView>(R.id.textView).text = args.foo.toString()
return view
}
}
FragmentGreen并被FragmentBlue复制粘贴，但用相应的颜色文本替换所有颜色文本，即FragmentRedArgs-> FragmentBlueArgs，R.layout.red-> R.layout.blue。
让我们这样声明主要活动布局：
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:id="@+id/content"
android:layout_height="match_parent">
<fragment
android:id="@+id/nav_host_fragment"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:defaultNavHost="true"
app:navGraph="@navigation/main_graph" />
</FrameLayout>
在哪里main_graph：
<?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_graph"
app:startDestination="@id/fragment_red">
<fragment
android:id="@+id/fragment_red"
android:name="com.playground.FragmentRed">
<argument
android:name="foo"
android:defaultValue="0"
app:argType="integer" />
<action
android:id="@+id/action_fragment_red_to_fragment_green"
app:destination="@id/fragment_green" />
</fragment>
<navigation
android:id="@+id/secondLevel"
app:startDestination="@id/fragment_green">
<fragment
android:id="@+id/fragment_green"
android:name="com.playground.FragmentGreen">
<argument
android:name="bar"
android:defaultValue="0"
app:argType="integer" />
<action
android:id="@+id/action_fragment_green_to_fragment_blue"
app:destination="@id/fragment_blue" />
</fragment>
<fragment
android:id="@+id/fragment_blue"
android:name="com.playground.FragmentBlue">
<argument
android:name="zar"
android:defaultValue="0"
app:argType="integer" />
</fragment>
</navigation>
</navigation>
现在MainActivity让我们在内部生成一个新通知，为每个片段传递参数：“foo”（红色）- 1、“bar”（绿色）- 2、“zar”（蓝色）- 3。
我们的期望是点击通知以打开带有文本 3 的蓝屏，在返回点击时会看到带有 2 的绿屏，再次点击应该会在屏幕上显示带有 1 的红屏：
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
val navController = findNavController(R.id.nav_host_fragment)
val pendingIntent = navController.createDeepLink()
.setGraph(R.navigation.main_graph)
.setDestination(R.id.fragment_blue)
.setArguments(bundleOf("foo" to 1, "bar" to 2, "zar" to 3))
.createPendingIntent()
createNotificationChannel() // outside of the scope of this answer
val builder = NotificationCompat.Builder(this, "my_channel")
.setContentTitle("title")
.setContentText("content text")
.setPriority(NotificationCompat.PRIORITY_DEFAULT)
.setContentIntent(pendingIntent)
.setSmallIcon(R.drawable.android)
.setAutoCancel(true)
.setChannelId("channelId")
with(NotificationManagerCompat.from(this)) {
notify(100, builder.build())
}
}
}
这是设备上的实际行为：
