doInBackground我正在嘗試讀取of內部的整數列表AsyncTask。當我將列表傳遞給 的構造函數時AsyncTask，它已滿。但是，當我到達該doInBackground函數時，它是空的。有任何想法嗎？public class floatingActionButtonClickListener implements View.OnClickListener{    @Override    public void onClick(View v) {        if(mAdapter.getDeleteModeStatus()){            // Delete items from database            ArrayList<Integer> IDsToDelete = mAdapter.getJournalIDsToDelete();            new DeleteDatabase().execute(IDsToDelete);            // Turn FAB back to regular button            mFAB.setImageResource(R.drawable.baseline_add_white_48); // Turn FAB to delete button            // Disable delete mode            mAdapter.exitDeleteMode();            // Load database            new LoadDatabase().execute();        }        else{            Intent intent = new Intent(getBaseContext(), AcitivtyJournal.class);            int journalType = Constants.JOURNALTYPE_FULL;            intent.putExtra(Constants.JOURNAL_TYPE, journalType);            startActivity(intent);        }    }}private class DeleteDatabase extends AsyncTask <ArrayList<Integer>, Void, Void> {    @Override    protected void onPreExecute() {        super.onPreExecute();        mProgressBarHolder.setVisibility(View.VISIBLE);    }    @Override    protected Void doInBackground(ArrayList<Integer>... arrayLists) {        ArrayList<Integer> IDsToDelete = arrayLists[0];        AppDatabase db = Room.databaseBuilder(getApplicationContext(), AppDatabase.class, "JournalEntries")                .build();        for(Integer idToDelete : IDsToDelete){            db.mJournalEntriesDao().deleteCompleteJournalEntry(idToDelete);        }        return null;    }    @Override    protected void onPostExecute(Void aVoid) {        mProgressBarHolder.setVisibility(View.GONE);    }}}