android-room

How to get rid of Incremental annotation processing requested warning?

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I have just started using android development and trying to use Room library. Since yesterday I am facing this warning message w: [kapt] Incremental annotation processing requested, but support is disabled because the following processors are not incremental: androidx.lifecycle.LifecycleProcessor (NON_INCREMENTAL), androidx.room.RoomProcessor (NON_INCREMENTAL). I have tried to research and fix but unable to avoid this error … Read more

Android Room – Get the id of new inserted row with auto-generate

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This is how I am inserting data into database using Room Persistence Library: Entity: @Entity class User { @PrimaryKey(autoGenerate = true) public int id; //… } Data access object: @Dao public interface UserDao{ @Insert(onConflict = IGNORE) void insertUser(User user); //… } Is it possible to return the id of User once the insertion is completed … Read more

Android Room – simple select query – Cannot access database on the main thread

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I am trying a sample with Room Persistence Library. I created an Entity: @Entity public class Agent { @PrimaryKey public String guid; public String name; public String email; public String password; public String phone; public String licence; } Created a DAO class: @Dao public interface AgentDao { @Query(“SELECT COUNT(*) FROM Agent where email = :email … Read more

Android room persistent: AppDatabase_Impl does not exist

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My app database class @Database(entities = {Detail.class}, version = Constant.DATABASE_VERSION) public abstract class AppDatabase extends RoomDatabase { private static AppDatabase INSTANCE; public abstract FavoritesDao favoritesDao(); public static AppDatabase getAppDatabase(Context context) { if (INSTANCE == null) { INSTANCE = Room.databaseBuilder(context.getApplicationContext(), AppDatabase.class, Constant.DATABASE).allowMainThreadQueries().build(); //Room.inMemoryDatabaseBuilder(context.getApplicationContext(),AppDatabase.class).allowMainThreadQueries().build(); } return INSTANCE; } public static void destroyInstance() { INSTANCE = null; } … Read more

How to make primary key as autoincrement for Room Persistence lib

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I am creating an Entity (Room Persistence Library) class Food, where I want to make foodId as autoincrement. @Entity class Food(var foodName: String, var foodDesc: String, var protein: Double, var carbs: Double, var fat: Double) { @PrimaryKey var foodId: Int = 0 var calories: Double = 0.toDouble() } How can I set foodId an autoincrement … Read more

Room – Schema export directory is not provided to the annotation processor so we cannot export the schema

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I am using Android Database Component Room I’ve configured everything, but when I compile, Android Studio gives me this warning: Schema export directory is not provided to the annotation processor so we cannot export the schema. You can either provide room.schemaLocation annotation processor argument OR set exportSchema to false. As I understand it is the … Read more