多线程：AsyncTask

/**
     * @param Params... Void    传入后台任务的参数，此处为不传参数
     * @param Progress  Integer 进度单位
     * @param Result    Boolean 返回值类型
     */

    class DemoTask extends AsyncTask<Void,Integer,Boolean>{
        @Override
        protected void onPreExecute() {
            progressDialog.show();
        }

        @Override
        protected void onPostExecute(Boolean aBoolean) {
            progressDialog.dismiss();
            if(aBoolean){
                ...
            }
        }

        @Override
        protected void onProgressUpdate(Integer... values) {
            progressDialog.setMessage("sss"+values[0])
        }

        @Override
        protected Boolean doInBackground(Void... voids) {
           doThing();
   //        publishProgress(xx);
        }
    }