IssueTracker

Library version used: androidx.car.app:app:1.3.0-rc01 Devices/Android versions reproduced on: Google Pixel 6 Pro, Android 13 Android Auto version reproduced on: 10.1.633034-release

I have a screen that has two tabs

@OptIn(ExperimentalCarApi::class)
class TasksHomeScreen(context: CarContext) : Screen(context),
  TabTemplate.TabCallback,
  Toggle.OnCheckedChangeListener {
  private val builder = TabTemplate.Builder(this)

  override fun onGetTemplate(): Template = builder
    .setHeaderAction(Action.APP_ICON)
    .addTab(TaskTab(carContext))
    .setTabContents(TasksContent())
    .addTab(SettingsTab(carContext))
    .setTabContents(SettingsContent(this))
    .build()

  override fun onTabSelected(tabContentId: String) {
  }

  override fun onCheckedChange(isChecked: Boolean) {
  }
}

Two tabs and their content are as follows

private const val CONTENT_ID = "tasks"

@OptIn(ExperimentalCarApi::class)
fun TaskTab(carContext: CarContext): Tab = Tab.Builder()
  .setTitle("Tasks")
  .setIcon(
    CarIcon.Builder(IconCompat.createWithResource(carContext, R.drawable.ic_event))
      .build()
  )
  .setActive(true)
  .setContentId(CONTENT_ID)
  .build()

@OptIn(ExperimentalCarApi::class)
fun TasksContent(): TabContents = TabContents.Builder(
  ListTemplate.Builder()
    .setLoading(false)
    .setSingleList(
      ItemList.Builder()
        .addItem(
          Row.Builder()
            .setTitle("Incidents")
            .build()
        )
        .build()
    )
    .build()
)
.build()

This crashes with

    java.lang.RuntimeException: androidx.car.app.HostException: Remote getTemplate onSuccess call failed
    	at androidx.car.app.utils.RemoteUtils.lambda$dispatchCallFromHost$0(RemoteUtils.java:154)
    	at androidx.car.app.utils.RemoteUtils$$ExternalSyntheticLambda1.run(Unknown Source:6)
    	at androidx.car.app.utils.ThreadUtils.runOnMain(ThreadUtils.java:39)
    	at androidx.car.app.utils.RemoteUtils.dispatchCallFromHost(RemoteUtils.java:146)
    	at androidx.car.app.utils.RemoteUtils.lambda$dispatchCallFromHost$1(RemoteUtils.java:185)
    	at androidx.car.app.utils.RemoteUtils$$ExternalSyntheticLambda2.run(Unknown Source:8)
    	at android.os.Handler.handleCallback(Handler.java:942)
    	at android.os.Handler.dispatchMessage(Handler.java:99)
    	at android.os.Looper.loopOnce(Looper.java:201)
    	at android.os.Looper.loop(Looper.java:288)
    	at android.app.ActivityThread.main(ActivityThread.java:7884)
    	at java.lang.reflect.Method.invoke(Native Method)
    	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
    	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936)
    Caused by: androidx.car.app.HostException: Remote getTemplate onSuccess call failed
    	at androidx.car.app.utils.RemoteUtils.dispatchCallToHostForResult(RemoteUtils.java:92)
    	at androidx.car.app.utils.RemoteUtils.dispatchCallToHost(RemoteUtils.java:105)
    	at androidx.car.app.utils.RemoteUtils.sendSuccessResponseToHost(RemoteUtils.java:221)
    	at androidx.car.app.utils.RemoteUtils.lambda$dispatchCallFromHost$0(RemoteUtils.java:149)
    	at androidx.car.app.utils.RemoteUtils$$ExternalSyntheticLambda1.run(Unknown Source:6) 
    	at androidx.car.app.utils.ThreadUtils.runOnMain(ThreadUtils.java:39) 
    	at androidx.car.app.utils.RemoteUtils.dispatchCallFromHost(RemoteUtils.java:146) 
    	at androidx.car.app.utils.RemoteUtils.lambda$dispatchCallFromHost$1(RemoteUtils.java:185) 
    	at androidx.car.app.utils.RemoteUtils$$ExternalSyntheticLambda2.run(Unknown Source:8) 
    	at android.os.Handler.handleCallback(Handler.java:942) 
    	at android.os.Handler.dispatchMessage(Handler.java:99) 
    	at android.os.Looper.loopOnce(Looper.java:201) 
    	at android.os.Looper.loop(Looper.java:288) 
    	at android.app.ActivityThread.main(ActivityThread.java:7884) 
    	at java.lang.reflect.Method.invoke(Native Method) 
    	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548) 
    	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936) 
    Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Class java.lang.Object.getClass()' on a null object reference
    	at android.os.Parcel.createExceptionOrNull(Parcel.java:3017)
    	at android.os.Parcel.createException(Parcel.java:2995)
    	at android.os.Parcel.readException(Parcel.java:2978)
    	at android.os.Parcel.readException(Parcel.java:2920)
    	at androidx.car.app.IOnDoneCallback$Stub$Proxy.onSuccess(IOnDoneCallback.java:119)
    	at androidx.car.app.utils.RemoteUtils.lambda$sendSuccessResponseToHost$3(RemoteUtils.java:223)
    	at androidx.car.app.utils.RemoteUtils$$ExternalSyntheticLambda0.call(Unknown Source:6)
    	at androidx.car.app.utils.RemoteUtils.dispatchCallToHostForResult(RemoteUtils.java:86)
    	at androidx.car.app.utils.RemoteUtils.dispatchCallToHost(RemoteUtils.java:105) 
    	at androidx.car.app.utils.RemoteUtils.sendSuccessResponseToHost(RemoteUtils.java:221) 
    	at androidx.car.app.utils.RemoteUtils.lambda$dispatchCallFromHost$0(RemoteUtils.java:149) 
    	at androidx.car.app.utils.RemoteUtils$$ExternalSyntheticLambda1.run(Unknown Source:6) 
    	at androidx.car.app.utils.ThreadUtils.runOnMain(ThreadUtils.java:39) 
    	at androidx.car.app.utils.RemoteUtils.dispatchCallFromHost(RemoteUtils.java:146) 
    	at androidx.car.app.utils.RemoteUtils.lambda$dispatchCallFromHost$1(RemoteUtils.java:185) 
    	at androidx.car.app.utils.RemoteUtils$$ExternalSyntheticLambda2.run(Unknown Source:8) 
    	at android.os.Handler.handleCallback(Handler.java:942) 
    	at android.os.Handler.dispatchMessage(Handler.java:99) 
    	at android.os.Looper.loopOnce(Looper.java:201) 
    	at android.os.Looper.loop(Looper.java:288) 
    	at android.app.ActivityThread.main(ActivityThread.java:7884) 
    	at java.lang.reflect.Method.invoke(Native Method) 
    	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548) 
    	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936)