Android - 按下后退按钮时停止AsyncTask并返回上一个Activity

Question

我有一个AsyncTask,我希望它按下后退按钮时执行.我还希望应用程序返回到之前显示的Activity.似乎我已经设法停止任务,但应用程序没有返回到上一个活动.有任何想法吗？这是我的代码摘录

private class MyTask extends AsyncTask<Void, Void, Void> implements OnDismissListener{
    private boolean exception= false;

    @Override
    protected void onPreExecute(){
        pd = ProgressDialog.show(
                IscrizioniActivity.this,
                "Please wait...",
                "Loading the data",
                true,
                true,
                new DialogInterface.OnCancelListener(){
                    public void onCancel(DialogInterface dialog) {
                        MyTask.this.cancel(true);
                    }
                }
        );
    }

    @Override
    protected Void doInBackground(Void... voids) {
        //do something
        return (null);
    }

    @Override
    protected void onPostExecute(Void voids) {
        pd.dismiss();
        //do something

    }

    public void onDismiss(DialogInterface dialog) {

        this.cancel(true);
    }

}

问候.

Answer 1

pd.setCancelable(true);
    pd.setOnCancelListener(cancelListener);
    bCancelled=false;

 pd is your progressdialog box

现在使用cancelListner

    OnCancelListener cancelListener=new OnCancelListener(){
    @Override
    public void onCancel(DialogInterface arg0){
        bCancelled=true;
        finish();
    }
};