RecyclierView的notifyItemInserted不能与arrayList一起使用

Question

我有一个ArrayList和一个RecyclerView。从DB中检索数据并将其存储在ArrayList中，以便在RecyclerView中显示。将新项添加到RecyclerView中时，所有操作都可以正常工作，但没有添加动画。我知道我应该使用notifyItemInserted来添加动画，但它不起作用。未显示插入动画。现在，我必须返回到前一页，然后再次进入该页，以便显示添加的项目。那么，如何重新添加插入动画呢？

任何帮助都将不胜感激。谢谢。

传递数据和设置适配器的代码：

 db = new DatabaseHelper(this);
    dbList = new ArrayList<>();
    dbList = db.getFilteredItems();

    RecyclerView mRecyclerView = (RecyclerView) findViewById(R.id.recyclerView);
    mRecyclerView.setHasFixedSize(true);
    LinearLayoutManager llm = new LinearLayoutManager(this);
    llm.setOrientation(LinearLayoutManager.VERTICAL);

    //newest to oldest order (database stores from oldest to newest)
    llm.setReverseLayout(true);
    llm.setStackFromEnd(true);

    mRecyclerView.setLayoutManager(llm);
    mRecyclerView.setItemAnimator(new DefaultItemAnimator());

    adapter = new RecyclerAdapter(this, llm, dbList);
    mRecyclerView.setAdapter(adapter);

从DB检索数据的代码：

 //retrieve filtered data from DB
public List<AudioItem> getFilteredItems(){
    List<AudioItem> audioList = new ArrayList<>();
    String titleName = EditActivity.titleName;
    String query = "select * from " + TABLE_NAME + " where " + COLUMN_NAME_RECORDING_NAME + " like '" + titleName + "%'";

    SQLiteDatabase db = this.getWritableDatabase();
    Cursor cursor = db.rawQuery(query,null);

    if (cursor.moveToFirst()){
        do {
            AudioItem audio = new AudioItem();
            audio.setId(Integer.parseInt(cursor.getString(0)));
            audio.setName(cursor.getString(1));
            audio.setFilePath(cursor.getString(2));
            audio.setLength(Integer.parseInt(cursor.getString(3)));
            audio.setTime(Long.parseLong(cursor.getString(4)));
            audioList.add(audio);

        }while (cursor.moveToNext());
        cursor.close();
    }

    return audioList;
}

将数据插入数据库的代码：

/* Insert data into database */
public void addRecording(String recordingName, String filePath, long length) {

    SQLiteDatabase db = getWritableDatabase();
    ContentValues cv = new ContentValues();
    cv.put(COLUMN_NAME_RECORDING_NAME, recordingName);
    cv.put(COLUMN_NAME_RECORDING_FILE_PATH, filePath);
    cv.put(COLUMN_NAME_RECORDING_LENGTH, length);
    cv.put(COLUMN_NAME_TIME_ADDED, System.currentTimeMillis());
    db.insert(TABLE_NAME, null, cv);
    db.close();

    if (mOnDatabaseChangedListener != null) {
        mOnDatabaseChangedListener.onNewDatabaseEntryAdded();
    }
}

调用插入动画的代码：

 @Override
public void onNewDatabaseEntryAdded() {
    //item added to top of the list
    Log.e("Count: ", Integer.toString(getItemCount()));
   // notifyDataSetChanged();
    notifyItemInserted(getItemCount());
    //llm.scrollToPosition(getItemCount() - 1);
}