Android Room 问题： protected void onCreate(SupportSQLiteDatabase _db)

Question

这是错误代码

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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\n      protected void onCreate(SupportSQLiteDatabase _db) {\n                     ^\n  attempting to assign weaker access privileges; was public\n

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您至少可以分享我的错误或您使用的房间代码或者可以举个例子吗？

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这是我的错误代码，它引导我到这里：（AppDatabase_Impl.java）

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@Override\n  protected void onCreate(SupportSQLiteDatabase _db) {\n    if (mCallbacks != null) {\n      for (int _i = 0, _size = mCallbacks.size(); _i < _size; _i++) {\n        mCallbacks.get(_i).onCreate(_db);\n      }\n    }\n  }\n

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这是我关注的列表

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文件夹布局

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com.name.test\n \xe2\x94\xa3 database\n \xe2\x94\x83 \xe2\x94\x97 AppDatabase.java\n \xe2\x94\x83 \xe2\x94\x97 Words.java\n \xe2\x94\x83 \xe2\x94\x97 WordsDao.java\n \xe2\x94\xa3 MainActivity.java\n

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应用程序数据库.java

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 package com.name.test.database;\n    \n    import androidx.room.Database;\n    import androidx.room.RoomDatabase;\n    \n    @Database(entities = {Words.class}, version = 1)\n    public abstract class AppDatabase extends RoomDatabase {\n        public abstract WordsDao wordsDao();\n    }\n

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字

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package com.name.test.database;\n\nimport androidx.room.ColumnInfo;\nimport androidx.room.Entity;\nimport androidx.room.PrimaryKey;\n\n@Entity\npublic class Words {\n\n    @PrimaryKey\n    public int uid;\n\n    @ColumnInfo(name = "words")\n    public String words;\n}\n

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词道

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package com.name.test.database;\n\nimport androidx.room.Dao;\nimport androidx.room.Delete;\nimport androidx.room.Insert;\nimport androidx.room.Query;\n\nimport java.util.List;\n\n@Dao\npublic interface WordsDao {\n\n    @Query("SELECT * FROM words")\n    List<Words> getAll();\n\n    @Insert\n    void insertAll(Words... words);\n\n    @Delete\n    void delete(Words words);\n}\n

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主要活动

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package com.name.test;\n\nimport androidx.appcompat.app.AppCompatActivity;\nimport androidx.room.Room;\n\nimport android.nfc.Tag;\nimport android.os.Bundle;\nimport android.util.Log;\nimport android.view.View;\n\nimport com.droidbane.test.database.AppDatabase;\nimport com.droidbane.test.database.Words;\nimport com.droidbane.test.database.WordsDao;\n\nimport java.util.List;\n\npublic class MainActivity extends AppCompatActivity {\n\n    @Override\n    protected void onCreate(Bundle savedInstanceState) {\n        super.onCreate(savedInstanceState);\n        setContentView(R.layout.activity_main);\n\n\n    }\n\n    public void ChangeTextClick(View view) {\n\n        AppDatabase db = Room.databaseBuilder(getApplicationContext(),\n                AppDatabase.class, "database-name").build();\n\n\n        WordsDao wordsDao = db.wordsDao();\n        List<Words> words = wordsDao.getAll();\n        Log.w("asd", "ChangeTextClick: " + words);\n    }\n}\n

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这个错误是我造成的还是文档造成的？代码是旧的吗？我做错什么了吗？

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Answer 1

只需将以下所有依赖项设置为同一版本即可：

//Room database
implementation "androidx.room:room-runtime:2.5.1"
implementation "androidx.room:room-ktx:2.5.1"
kapt "androidx.room:room-compiler:2.5.1"
androidTestImplementation "androidx.room:room-testing:2.5.1"

Answer 2

我通过降低版本解决了我的问题：

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'