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this is the error code
C:\Users\huh\AndroidStudioProjects\test\app\build\generated\ap_generated_sources\debug\out\com\name\test\database\AppDatabase_Impl.java:56: error: onCreate(SupportSQLiteDatabase) in <anonymous com.droidbane.test.database.AppDatabase_Impl$1> cannot override onCreate(SupportSQLiteDatabase) in Delegate
protected void onCreate(SupportSQLiteDatabase _db) {
attempting to assign weaker access privileges; was public
Can you at least share my mistake or your Room code that you used or could give an example?
this is my error code and it leads me here: (AppDatabase_Impl.java)
@Override
protected void onCreate(SupportSQLiteDatabase _db) {
if (mCallbacks != null) {
for (int _i = 0, _size = mCallbacks.size(); _i < _size; _i++) {
mCallbacks.get(_i).onCreate(_db);
This is the list I followed
folder layout
📦com.name.test
┣ 📂database
┃ ┗ 📜AppDatabase.java
┃ ┗ 📜Words.java
┃ ┗ 📜WordsDao.java
┣ 📜MainActivity.java
AppDataBase.java
package com.name.test.database;
import androidx.room.Database;
import androidx.room.RoomDatabase;
@Database(entities = {Words.class}, version = 1)
public abstract class AppDatabase extends RoomDatabase {
public abstract WordsDao wordsDao();
Words
package com.name.test.database;
import androidx.room.ColumnInfo;
import androidx.room.Entity;
import androidx.room.PrimaryKey;
@Entity
public class Words {
@PrimaryKey
public int uid;
@ColumnInfo(name = "words")
public String words;
WordsDao
package com.name.test.database;
import androidx.room.Dao;
import androidx.room.Delete;
import androidx.room.Insert;
import androidx.room.Query;
import java.util.List;
public interface WordsDao {
@Query("SELECT * FROM words")
List<Words> getAll();
@Insert
void insertAll(Words... words);
@Delete
void delete(Words words);
MainActivity
package com.name.test;
import androidx.appcompat.app.AppCompatActivity;
import androidx.room.Room;
import android.nfc.Tag;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import com.droidbane.test.database.AppDatabase;
import com.droidbane.test.database.Words;
import com.droidbane.test.database.WordsDao;
import java.util.List;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
public void ChangeTextClick(View view) {
AppDatabase db = Room.databaseBuilder(getApplicationContext(),
AppDatabase.class, "database-name").build();
WordsDao wordsDao = db.wordsDao();
List<Words> words = wordsDao.getAll();
Log.w("asd", "ChangeTextClick: " + words);
Is this error caused by me or is it due to the document? Are the codes old? Did I do something wrong?
I solved my problem by decreasing the version:
implementation 'androidx.room:room-runtime:2.2.2'
annotationProcessor "android.arch.persistence.room:compiler:1.1.1"
kapt "android.arch.persistence.room:compiler:1.1.1"
kapt 'androidx.room:room-compiler:2.2.2'
// optional - RxJava2 support for Room
implementation 'androidx.room:room-rxjava2:2.2.2'
// optional - RxJava3 support for Room
implementation 'androidx.room:room-rxjava3:2.4.2'
// optional - Guava support for Room, including Optional and ListenableFuture
implementation 'androidx.room:room-guava:2.2.2'
// optional - Test helpers
testImplementation 'androidx.room:room-testing:2.2.2'
// optional - Paging 3 Integration
implementation 'androidx.room:room-paging:2.4.2'
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