package com.example.wordlist; import androidx.annotation.NonNull; import androidx.annotation.Nullable; import androidx.appcompat.app.AppCompatActivity; import androidx.lifecycle.Observer; import androidx.lifecycle.ViewModelProviders;…

package com.example.wordlist; import android.content.Context; import android.os.AsyncTask; import androidx.annotation.NonNull; import androidx.room.Database; import androidx.room.Entity; import androidx.room.Room; import androidx.room.RoomDatabase; import androidx.sqlite.db.SupportSQLiteDatabase; @Database(entities = Words.class, version = 1) public abstract class WordRoomDb extends RoomDatabase { private static WordRoomDb instance; public abstract WordsDao wordsDao(); //Singlton public static synchronized WordRoomDb getInstance(Context context) { if (instance == null) { instance = Room.databaseBuilder(context.getApplicationContext(), WordRoomDb.class, "word3-database") .fallbackToDestructiveMigration() .addCallback(roomCallBack) .build(); } return instance; } private static RoomDatabase.Callback roomCallBack = new RoomDatabase.Callback() { @Override public void onCreate(@NonNull SupportSQLiteDatabase db) { super.onCreate(db); new PopulateDataAsyncTask(instance).execute(); } }; private static class PopulateDataAsyncTask extends AsyncTask<Void,Void, Void> { private WordsDao mWordsDao; PopulateDataAsyncTask(WordRoomDb db) { mWordsDao = db.wordsDao(); } @Override protected Void doInBackground(Void... voids) { mWordsDao.insert(new Words("book", "Book", "noun")); mWordsDao.insert(new Words("book", "Book", "noun")); mWordsDao.insert(new Words("book", "Book", "noun")); return null; } } }
ROOM JAVA Android – سلسلة دروس أندرويد – part 5 – Room class
في الدقيق 1:05
اسنتي قيمة version = 1
sr
@)atabase(entities : (Words.class). version : I)
كيف نعرف قيمة ال version لل database