java - AsyncTask get() 方法无法正常工作

Question

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 值是 ""直到 myAsyncTask 完成。所以看起来像

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

未被调用。我做错了什么？

Answer 1

它被调用了，然后你调用了

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

和get()是阻塞调用

请尝试在 onPostExecute() 中设置文本。如果我对你的理解正确，那么像这样的东西应该会给你你想要的东西

   //(...)
        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 translationTextView.setText() 的内部类，插入您试图从 doInBackground()