URL of codelab

https://developer.android.com/codelabs/basic-android-kotlin-training-persisting-data-room

In which task and step of the codelab can this issue be found?

When trying to run the project after the "Implement Application class" step.

Describe the problem

The build.gradle files are not the same in the starter and main branch. The starter file is out of date and makes the whole project build crash with an error like this :

/ItemDao.java:13: error: Type of the parameter must be a class annotated with @Entity or a collection/array of it.

The fix was to do git checkout main -- build.gradle, it took me hours to figure out what was the problem.

Steps to reproduce?

1. git clone [email protected]:google-developer-training/android-basics-kotlin-inventory-app.git
2. git checkout main
3. open the project in android studio
4. build the project
5. the build works
6. git checkout starter -- build.gradle
7. the build crashes.

Versions Android Studio version: 2020.3.1 API version of the emulator: N/A

Additional information Include screenshots if they would be useful in clarifying the problem.

URL of codelab https://developer.android.com/codelabs/basic-android-kotlin-training-persisting-data-room

In which task and step of the codelab can this issue be found? Solution code

Describe the problem I got this error: Type of the parameter must be a class annotated with @Entity or a collection/array of it, when I finished the codelab and I fixed it by updating the room_version defined in the build.gradle. It's currently using 2.2.6, I've updated to 2.3.0.

Steps to reproduce? Do all steps of the codelab, the run the app.

Additional information I checked the branch room and there, this version is already updated.

After all code chapter 5 at the end

    private fun getUpdatedItemEntry(itemId: Int, itemName: String, itemPrice: String, itemCount: String) =
        Item(itemId, itemName, itemPrice.toDouble(), itemCount.toInt())

There will be and error if you save it when in price field will be "," - it's possible because of formatter NumberFormat.getCurrencyInstance().format(itemPrice) possible fix:

    private fun getUpdatedItemEntry(itemId: Int, itemName: String, itemPrice: String, itemCount: String) =
        Item(itemId, itemName, itemPrice.replace(",", ".").toDouble(), itemCount.toInt())

URL of codelab https://developer.android.com/codelabs/basic-android-kotlin-training-persisting-data-room

In which task and step of the codelab can this issue be found? Probably step 6 and in step 9 when running the code

Describe the problem Build output shows a lot of error when running such as annotation and return type of the functions in DAO, specifically:

• error: Type of the parameter must be a class annotated with @Entity or a collection/array of it. kotlin.coroutines.Continuation<? super kotlin.Unit> continuation);

• error: Not sure how to handle insert method's return type. public abstract java.lang.Object insert(@org.jetbrains.annotations.NotNull()

• error: Not sure how to handle delete method's return type. Currently the supported return types are void, int or Int. public abstract java.lang.Object delete(@org.jetbrains.annotations.NotNull()

• error: Type of the parameter must be a class annotated with @Entity or a collection/array of it. kotlin.coroutines.Continuation<? super kotlin.Unit> continuation);

• error: Type of the parameter must be a class annotated with @Entity or a collection/array of it. kotlin.coroutines.Continuation<? super kotlin.Unit> continuation);

• error: Not sure how to handle update method's return type. Currently the supported return types are void, int or Int. public abstract java.lang.Object update(@org.jetbrains.annotations.NotNull()

Versions Android Studio version: Chipmunk 2021.2.1 API version of the emulator: API 31

Additional information

The 'Before you Begin' page mentions an image of how Room fits in with the overall architecture recommended in the course, however, the image seems to no longer be available.

Hi, it seems that Room version '2.2.6' in the starter code's gradle is bringing error when compiling at the end of the "Persist data with Room" module. Updating it to '2.3.0' makes it work.

-Under 'Persist data with room', item 7 (create a database instance)

Code at the end of the picture should 'instance' and not 'return instance'. As it is already a return statement

URL of codelab https://developer.android.com/codelabs/basic-android-kotlin-training-persisting-data-room?authuser=1#2

In which task and step of the codelab can this issue be found? first page of the code.

Describe the problem

When i am going to install the application after build, it shows only the Inventory page not and then when i am clicking add button then it is showing to add item and then item price and quantity in stock, then after if you are going to submit this by clicking save button then it shows no change on the page. Maybe it not connected to next page. Please fix this error

Steps to reproduce?

1. Go to...
2. Click on...
3. See error...

Versions Android Studio version: Android Studio 4.2.2 API version of the emulator: Android 11

Additional information Include screenshots if they would be useful in clarifying the problem.

The Room and the Main branch don't build properly for me. Working from the Starter code, it stopped working, I believe, in the 7th section of Persist Data with Room. E/LazyAlarmStore: Removed TIME_TICK alarm E/WifiDataStall: onDataConnectionStateChanged unexpected State: 3 E/MboOceController: onDataConnectionStateChanged unexpected State: 3

Solution code couldn't build.

Android Studio Version: BumbleBee | 2021.1.1. Patch 2 API Version of the emulator: 30

Reproduce steps: Just using the solution code is going to reproduce the bug.

Description of the problem: I am getting build error according to suspend function and coroutines.

I've followed the examples precisely and get the following error when I create the Database class:

Execution failed for task ':app:kaptDebugKotlin'.

A failure occurred while executing org.jetbrains.kotlin.gradle.internal.KaptWithoutKotlincTask$KaptExecutionWorkAction java.lang.reflect.InvocationTargetException (no error message)

• Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

Before creating the class there are no errors when I build and I'm just beginning in Android so not really sure how to resolve this.

I'm using a macbook pro with the new M1 Max chip.

I've tried switching from kapt "androidx.room:room-compiler:$room_version" to kapt "androidx.room:room-compiler:2.4.1" but then I get a different error:

error: cannot find symbol import androidx.room.migration.AutoMigrationSpec; ^ symbol: class AutoMigrationSpec location: package androidx.room.migration

companion object { @Volatile private var INSTANCE: ItemRoomDatabase? = null fun getDatabase(context: Context): ItemRoomDatabase { return INSTANCE ?: synchronized(this) { val instance = Room.databaseBuilder( context.applicationContext, ItemRoomDatabase::class.java, "item_database" ) .fallbackToDestructiveMigration() .build() INSTANCE = instance return instance -----------------------> this need delete "return" } } }

companion object {
       private val DiffCallback = object : DiffUtil.ItemCallback<Item>() {
           override fun areItemsTheSame(oldItem: Item, newItem: Item): Boolean {
               return oldItem === newItem
           }

           override fun areContentsTheSame(oldItem: Item, newItem: Item): Boolean {
               return oldItem.itemName == newItem.itemName
           }
       }
   }

In this companion object, the function areItemsTheSame has the ===. I think it's an typo mistake.

InventoryViewModel.kt,

In "Step 5, Implement sell item", sub-step 'Update the entity using Room' sub-sub-step 4. states that inside the 'updateItem()' function, we are to make a call to the 'getUpdatedItemEntry()' function and assign the returned value to an immutable variable called 'updatedItem'.

"val updatedItem" is not used?

In Android Studio, this value is grey, indicating it isn't used in the app. I've checked the solution code, and I can't find the error.

Hi, I have errors happening both when I have followed step by step the tutorial using the starter code and also when I use the solution code.

Starter code branch name: starter Solution code branch name: room

The errors that happens, do happen in different scenario depending which code is used.

Error 1: When running starter code after all steps in the tutorial have been completed and the below scenario happens. Scenario:

• I have multiple inventory items, and I therefore they show up in the list view.
• I click on the item at the top of the list view which directs me to the detail page for that item.
• I then click 'Delete' button and click 'Yes' in the pop up confirmation dialogue and I am directed back to the list view.
• When back to the list view there is a split-second, where the deleted item, from previous step, is still visible in the list view until the list view updates to reflect that the item is deleted and hence not showing. If I am really fast and manage to click the item during that split-second, then the app crashes [Inventory has stopped].

Error 2: When running solution code and the below scenario happens. Scenario:

• I open/start the app for the very first time.
• I click the floating action button (+) to add a new item to my inventory, and I am directed to the Add Item page.
• I enter values for the required input fields (Item Name, Item Price, and Quantity in Stock) and press [Save] button which leads to the app crashes [Inventory has stopped].

Does anyone else experience that the app crashes in the above to scenarios? Either error (1) using the starter code after completing the tutorial. Or error (2) using the solution code.

I would appreciate if anyone would have time to help.

Kind regards Kirstine

error: Type of the parameter must be a class annotated with @Entity or a collection/array of it. kotlin.coroutines.Continuation<? super kotlin.Unit> continuation);