Room Invalidation跟踪器初始化了两次 [英] Room Invalidation tracker is initialized twice

问题描述

我有一个水平的回收站视图，其中包含自定义项目.每个项目都可以在回收者"视图中保留当前项目的位置.我想在使用拖放功能移动项目时更新项目位置.但是，当水平视图中有三项以上时，数据将被删除.请帮帮我. 源代码

I have a horizontal recycler view with custom items in it . Each item can hold the position of current item in the Recycler view . I want to update the item position when item is moved using drag and drop . However the data is getting deleted when there are more then three items in horizontal view.Please Help me out . Source Code

这就是我在Logcat中得到的:

This is what i am getting in Logcat:

E/ROOM:无效跟踪器被初始化两次:/.

E/ROOM: Invalidation tracker is initialized twice :/.

E/物品已移动:Counterfrom3

E/Item moved: Counterfrom3

下一项:to2

在onCreate中初始化数据库.

Initialization of database in onCreate.

 db = Room.databaseBuilder(getApplicationContext(), AppDatabase.class, DB_NAME)
                .fallbackToDestructiveMigration()
                .allowMainThreadQueries()
                .build();

RecyclerView适配器代码.

RecyclerView Adapter code.

@Override
public boolean onItemMove(int fromPosition, int toPosition) {
    String name = dataSet.get(fromPosition).getName();
    //this will make "Add item" do not move from its first position..
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
        if (!(Objects.equals(name, "Add") || (toPosition == 0 && fromPosition == 1))) {
            Collections.swap(dataSet, fromPosition, toPosition);
            MoveItem(fromPosition, toPosition);
            notifyItemMoved(fromPosition, toPosition);
            return true;
        }
    }
    return false;
}

移动项目时更新数据的代码.

The code to update the data when items are moved.

 public static void MoveItem(int fromPosition,int toPosition){
        String name = data.get(fromPosition).getName(); //This gets the current item name in the view 
        String nexName = data.get(toPosition).getName(); //This gets the next item name in the view 

        ContentValues fromContentValues = new ContentValues();
        fromContentValues.put("posItem", toPosition); //adding data to ContentValues
        ContentValues toContentValues = new ContentValues();
        toContentValues.put("posItem", fromPosition);
        Log.e("Item moved", name + "from" + fromPosition + "\n" + "next item:" + "to" + toPosition);

        db.beginTransaction();
        try {
        db.getOpenHelper().getWritableDatabase().update(name,
                0, fromContentValues, "posItem =" + fromPosition, null);

        db.getOpenHelper().getWritableDatabase().update(nexName,
                0, toContentValues, "posItem =" + toPosition, null);
        db.setTransactionSuccessful(); //setting Transaction Successful
        } finally {
            db.endTransaction(); // commit or rollback
            db.close(); //closing database
        }
    }

推荐答案

当我迁移数据库版本时，会发生相同的错误E/ROOM: Invalidation tracker is initialized twice，杀死该应用程序，然后重新打开工作.当我开始使用Room v1.1.0时.

When I migrate the database version, same error happens E/ROOM: Invalidation tracker is initialized twice, kills the app, and reopens work. When I started using Room v1.1.0.

但是，如果我将所有内容保持不变并重新使用Room v1.0.0，则不会发生此类问题，并且一切正常.

But if I keep everything the same and go back to using Room v1.0.0, no such problem occurs and everything works perfectly.

所以，可能是Room v1.1.0问题

So, May be Room v1.1.0 issue

Google问题

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