AsyncTask get() 方法无法正常工作 [英] AsyncTask get() method not working properly

问题描述

我正在使用以下代码:

//(...)
translationTextView.setText("Searching for translation...");
translationTextView.setVisibility(View.VISIBLE);

myAsyncTask = (MyAsyncTask) new MyAsyncTask().execute(someString);

try {
    //As I understand it should wait here until AsyncTask is completed. But why for the time of execution translateTextView value is ""?
    translationTextView.setText(translateTask.get() + "<BR>");
} catch (InterruptedException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
} catch (ExecutionException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}

问题是 translationTextView 的值是 ""，直到 myAsyncTask 完成.所以它看起来像

The problem is that translationTextView value is "" until myAsyncTask is finished. So it looks like

translationTextView.setText("Searching for translation...");

没有被调用.我做错了什么?

is not called. What did I do wrong?

推荐答案

它被调用但是你调用

translationTextView.setText(translateTask.get() + "<BR>");

和 get() 是一个阻塞调用

and get() is a blocking call

尝试在您的 onPostExecute() 中设置文本.如果我理解正确，那么这样的事情应该给你你想要的

Try instead to set the text in your onPostExecute(). If I understand you correctly then something like this should give you what you want

   //(...)
        translationTextView.setText("Searching for translation...");
        translationTextView.setVisibility(View.VISIBLE);

        myAsyncTask = (MyAsyncTask) new MyAsyncTask().execute(someString);

然后，假设 MyAsyncTask 是您的 Activity 调用的内部类 translationTextView.setText() 插入您试图从 <代码>doInBackground()

Then, assuming MyAsyncTask is an inner class of your Activity call translationTextView.setText() inserting whatever you are trying to return from doInBackground()

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