我想顯示正在讀取的文件的進(jìn)度，并將其放入數(shù)組列表中。這樣做時，在應(yīng)用程序以列表視圖向用戶顯示數(shù)組列表之前，我想顯示通過 AsyncTask 讀取了多少文件。目前短暫顯示白屏。正在讀取的文件由大約 20000 行組成。AsyncTask( MyTask)在onCreate()方法中執(zhí)行，如下： private class MyAsync extends AsyncTask<Void, Integer, ArrayList<Movie>> {    ProgressDialog mProgressDialog;    ArrayList<Movie> movies;    @Override    protected void onPreExecute() {        super.onPreExecute();        //Show progress to user        mProgressDialog = new ProgressDialog(MovieRatingsActivity.this);        mProgressDialog.setTitle("Reading file");        mProgressDialog.setMessage("Reading file, Please Wait!");        mProgressDialog.setIndeterminate(false);        mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);        mProgressDialog.show();    }    @Override    protected ArrayList<Movie> doInBackground(Void... voids) {        try {            InputStream inputStream = getResources().openRawResource(R.raw.ratings);            int count = inputStream.available();            // onProgressUpdate( (amount read by inputstream / size of file )* 100 );            movies = Movie.loadFromFile(inputStream);            return movies;        } catch (Exception e) {            e.printStackTrace();        }        return null;    }    @Override    protected void onProgressUpdate(Integer... progress) {        super.onProgressUpdate(progress);        mProgressDialog.setProgress(progress[0]);    }    @Override    protected void onPostExecute(ArrayList<Movie> movies) {        super.onPostExecute(movies);        mProgressDialog.dismiss();        mInflater = (LayoutInflater) getApplicationContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);        setListAdapter(new RowIconAdapter(getApplicationContext(), R.layout.listrow, R.id.row_label, movies));    }}