来源AsyncTask.execute未找到（） [英] Source not found on AsyncTask.execute()

问题描述

我想用的AsyncTask相处..
什么我的问题是，我是动态生成textviews的表的基础上，过程的输出。但后来我想通，通过使用AsyncTask的我可以更高效way..So做到这一点，我所做的是如下

I am trying to get along with AsyncTask.. what my problem was that i was building a table of textviews dynamically, based on the output of a procedure.. But then i figured that by using asynctask i can do it in a more efficient way..So, what i did is as follows:

private class DisplayReport extends AsyncTask<Void, Void, Boolean>{
    protected void onPreExecute(){
        //Message -- "Please wait while the Report Loads..."
    }

    @Override
    protected Boolean doInBackground(Void... params) {
        //Here i fetch the data from the procedure via a web service
        //parse the result of web service and set a bool variable true or false based on whether the dataset fetched is empty or not.
    }
    protected void onPostExecute(Boolean value){
        if(value == true){
                 "Please try again later!!"
        }
        else{
                 runOnUiThread(GenTable);
        }
    }
    private Runnable GenTable = new Runnable(){
        public void run(){
            try {
                displayReport(result); // in this method i build the table.
            } catch (Exception e) {
                ad.setTitle("Error..");
                ad.setMessage(e.toString());
            }
        }
    };
}

以上异步类是我的主类的内部类延伸活动。
这就是我如何执行的AsyncTask ..

the above async class is an inner class in my main class which extends activity. and this is how i am executing the asynctask..

DisplayReport dr = new DisplayReport();
dr.execute();

现在，当我调试，我得到的上dr.execute错误（）找不到源..
我试着在网上搜索了很多，但我根本无法找到任何具体。另外，请让我知道如果我的做法是不正确..
这个问题似乎很愚蠢，但我是新来的Andr​​oid和Java以及任何帮助将是真正伟大的..

now when i debug, i get the "source not found" error on dr.execute().. i tried searching a lot on the net, but i simply cannot find out anything concrete. Also, please let me know if my approach is incorrect.. this question might seem very silly, but i am new to android and java as well and any help would be really great..

谢谢！

推荐答案

onPostExecute 已经被在UI线程中运行，所以你不应该创建另一个可运行它。只要你的 onPostExecute 是这样的：

onPostExecute is already being run in the UI thread, so you should not create another runnable for it. Just make your onPostExecute like this:

 protected void onPostExecute(Boolean value){
            if(value == true){
                     String message = "Please try again later!!";
                     // Do something here with your message
            }
            else{
                     displayReport(result);
            }
        }

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