public class AsynkTaskJob<T> {

    private CustomAsyncTask mCustomAsyncTask;
    private Context context;


    public AsynkTaskJob(Job job) {
        mCustomAsyncTask = new CustomAsyncTask(job);

    }

    public AsynkTaskJob( Context context, Job job) {
        mCustomAsyncTask = new CustomAsyncTask(job, context);

    }

    public AsynkTaskJob( Context context, String loadingMessage, Job job) {
        mCustomAsyncTask = new CustomAsyncTask(job, context, loadingMessage);
    }

    public void start() {
        mCustomAsyncTask.execute();
    }

    // CustomAsyncTask
    private class CustomAsyncTask extends AsyncTask<Void, Void, T> {

        private Job<T> mJob;
        private Exception mException;
        private String loadingMessage = null;
        private Context context;
        private DialogUtils.DialogLoader dialogLoader;


        private CustomAsyncTask(Job job) {
            mJob = job;
        }

        public CustomAsyncTask(Job job, Context context) {
            this.context = context;
            mJob = job;
        }

        public CustomAsyncTask(Job job, Context context, String loadingMessage) {
            this.context = context;
            this.loadingMessage = loadingMessage;
            mJob = job;
        }

        @Override
        protected void onPreExecute() {
            super.onPreExecute();

            if(context != null){
                dialogLoader = DialogUtils.showLoader(context, loadingMessage);
                dialogLoader.setCancelable(false);
            }

        }

        @Override
        protected T doInBackground(Void... voids) {

            try {

                return mJob.onStart();
            } catch (Exception e) {
                e.printStackTrace();
                mException = e;
                return null;
            }
        }

        @Override
        protected void onPostExecute(T type) {
            super.onPostExecute(type);

            if (mException == null)
                mJob.onComplete(type);
            else
                mJob.onError(mException);


            if(dialogLoader != null)
                dialogLoader.dismiss();
        }
    }

    // The Job interface
    public interface Job<T> {
        public T onStart() throws Exception;
//        public void onStart() throws Exception;
        public void onComplete(T object);
        public void onError(Exception e);
    }

}