相关疑难解决方法(0)

我有一个列表视图,其中包含复选框.对于每个复选框(它们大约为3),它具有特定的AsyncTask.

我永远不知道用户选择什么样的复选框,所以我不能将异步任务放在AlertDialog的末尾,因为我永远不知道用户是否只选择了一个复选框,或者两个或三个.

因为AsyncTask是按步骤执行的(仅当第一个Async完成时才是第二个开始),我想到了一个新的AsyncTask与AlertDialog的结尾.

private class showMessageAsync extends AsyncTask<Void, Integer, String> {
    @Override
    protected String doInBackground(Void... params){
        AlertDialog alertDialog;
        alertDialog = new AlertDialog.Builder(getApplicationContext).create();
        alertDialog.setTitle("The Process");  
        alertDialog.setIcon(R.drawable.success);
        alertDialog.setCanceledOnTouchOutside(false);
        alertDialog.setMessage("All done!");  
        alertDialog.setButton(AlertDialog.BUTTON_NEUTRAL, "OK",
                              new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                Intent A = new Intent(DownloadActivity.this, Menu_activity.class);
                startActivity(A);
                finish();
            }
        });
        alertDialog.setOnDismissListener(new DialogInterface.OnDismissListener() {          
            @Override
            public void onDismiss(DialogInterface dialog) {
                Intent A = new Intent(DownloadActivity.this, Menu_activity.class);
                startActivity(A);
                finish();
            }
        });
        alertDialog.show();
        return "Executed";
    }
}

这是错误:

10-21 04:24:34.117: E/AndroidRuntime(1026): FATAL …