CODEWITHSUNDEEP
androidandroid-sqliteandroid-roomdao
Squall Huang
Squall Huang

Reputation: 705

How to solve this Android SQLite Room DAO error message?

I don't know what's wrong with below problem?

Code:

CategoryDAO.kt

@Dao
interface CategoryDAO {
    @Query("select * from CategoryDesign")
    suspend fun getCategory(): MutableLiveData<List<CategoryDesign>>


}

CategoryDesign.kt

@Entity
data class CategoryDesign (
    @PrimaryKey
    var categoryDesignID:String,
    var designImage:String,
    var designTitle:String){
    constructor() : this("","","")

    override fun toString(): String {
        return designTitle
    }
}

Press Run App button will show error like below:

error: Not sure how to convert a Cursor to this method's return type (androidx.lifecycle.MutableLiveData<java.util.List<com.squall.searchdesigner.model.CategoryDesign>>).
    public abstract java.lang.Object getCategory(@org.jetbrains.annotations.NotNull()


w: [kapt] Incremental annotation processing requested, but support is disabled because the following processors are not incremental: androidx.room.RoomProcessor (DYNAMIC), android.databinding.annotationprocessor.ProcessDataBinding (DYNAMIC).

dependencies:

dependencies {
    def room_version = "2.2.3"
kapt "androidx.room:room-compiler:$room_version"
implementation "androidx.room:room-ktx:$room_version"
}

Upvotes: 0

Views: 308

Answers (2)

Squall Huang
Squall Huang

Reputation: 705

Thank you all. I used below code and rebuild project and invalidate caches seems solve this problem.

@Dao
interface CategoryDAO {
    @Query("select * from CategoryDesign")
    fun getCategory(): LiveData<MutableList<CategoryDesign>>


}

Upvotes: 0

Ilia Kuzmin
Ilia Kuzmin

Reputation: 165

It's seems like you can use only LiveData return type. Maybe Room not allows you to use MutableLiveData?

Upvotes: 0

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