android-room

来源： https://stackoverflow.com/questions/56102730/jetpack-navigation-how-to-handle-dependency-warning-when-adding-nav-graph-xml

来源： https://stackoverflow.com/questions/61778041/what-format-should-the-db-file-take-in-a-call-to-room-createfromassetinitia

来源： https://stackoverflow.com/questions/50775527/getdatabase-called-recursively-using-room

来源： https://stackoverflow.com/questions/50775527/getdatabase-called-recursively-using-room

来源： https://stackoverflow.com/questions/50775527/getdatabase-called-recursively-using-room

来源： https://stackoverflow.com/questions/49221753/exposing-a-room-database-to-other-apps

来源： https://stackoverflow.com/questions/63382855/how-to-add-embedded-and-relation-to-room-database

来源： https://stackoverflow.com/questions/59710677/collection-contains-no-element-matching-the-predicate

问题 I am new to android development. In my app, I need to have a user table in the database. I have created the database using room. Now, if I allow to run the db in the main thread, my app is running fine. But, I don't want to run it in the main thread. So, I created the repository and viewmodel classes and calling the db in the main thread using the viewmodel. Still if I don't put allowMainThreadQueries() in the database building statement, java.lang.IllegalStateException: Cannot access

问题 Using the @Relation annotation. I can query a one to many relationship using the following: @Dao public interface PostDao { @Query("SELECT * FROM post") List<PostWithComments> getPostWithComments(); } Here are the entities @Entity public class Post { @PrimrayKey private int id; private String title; private String content; } @Entity public class Comment { @PrimrayKey private int id; private int post_id; private String content; private String status; } public class PostWithComments { @Embedded