Android的 - 在执行职务中的AsyncTask [英] Android - on post execute in AsyncTask

问题描述

目前，我有一个的AsyncTask 这在preexecute开始装载酒吧，在后台送东西到服务器，并在后期执行关闭对话框并启用按钮。然而，我的职位是执行不因doInBackground执行返回null。我试图找出什么我可以做做得到postExecute运行。有任何想法吗？谢谢

code：

 类DatabaseAsync扩展的AsyncTask＆LT;太虚，太虚，太虚＆GT; {
        @覆盖
        在preExecute保护无效（）{
            对话框= ProgressDialog.show（MainFeedActivity.this，空发布...）;
        }        @覆盖
        保护无效doInBackground（虚空......为arg0）{
            Log.d（TAG，发送到DATABSE）;
            SendToDatabase（）;
            Log.d（TAG，发送到数据库 - 完成）;            //dialog.dismiss（）;            //sendButton.setEnabled(true）;            返回null;
        }        保护无效onPostExecute（）{
            Log.d（TAG，P执行）;
            dialog.dismiss（）;
            sendButton.setEnabled（真）;
            Log.d（TAG，执行完毕）;
        }    }
 

解决方案

这是完全可以返回空从 doInBackground（）你的情况。只要确保onPostExecute（）看起来是这样的：

  @覆盖
保护无效onPostExecute（虚空结果）{
    Log.d（TAG，P执行）;
    dialog.dismiss（）;
    sendButton.setEnabled（真）;
    Log.d（TAG，执行完毕）;
}
 

I currently have an asyncTask which on preexecute begins a loading bar, in background send something to a server, and on post execute dismisses the dialog and enables a button. However, my post execute is not executing due to doInBackground returning null. I'm trying to figure out what I can do do get the postExecute to run. any ideas? thanks

code:

class DatabaseAsync extends AsyncTask<Void,Void,Void>{
        @Override
        protected void onPreExecute(){
            dialog = ProgressDialog.show(MainFeedActivity.this, null, "Posting...");
        }

        @Override
        protected Void doInBackground(Void... arg0) {
            Log.d(TAG, "send to databse");
            SendToDatabase();
            Log.d(TAG, "sent to database - DONE");

            //dialog.dismiss();

            //sendButton.setEnabled(true);

            return null;
        }

        protected void onPostExecute(){
            Log.d(TAG, "p execute");
            dialog.dismiss();
            sendButton.setEnabled(true);
            Log.d(TAG, "done executing");
        }

    }

解决方案

It is completely Ok to return null from doInBackground() in your case. Just make sure onPostExecute() looks like this:

@Override
protected void onPostExecute(Void result) {
    Log.d(TAG, "p execute");
    dialog.dismiss();
    sendButton.setEnabled(true);
    Log.d(TAG, "done executing");
}

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