java - 无法从静态方法调用 AsyncTask？

Question

我似乎无法从静态方法调用 AsyncTask。它说“不能从静态上下文中引用”。重要的是这个方法是静态的，我需要像我的其他几个进程一样使用它。

有没有办法从方法中调用 AsyncTask？

public static void UpdateResults(String requestSearch){
    new GetSearchResults(requestSearch).execute(); //shows an error
}

class GetSearchResults extends AsyncTask<Void, Void, Void> {

    String requestSearch;

    GetSearchResults(String searchtext){
        this.requestSearch = searchtext;
    }

    @Override
    protected Void doInBackground(Void... params) {
        //functions continuing 
    }
}

编辑:Anands 解决方案有效，但它一到达方法就抛出此异常:

FATAL EXCEPTION: AsyncTask #1
    Process: com.eproject.eproject.emobile, PID: 26831
    java.lang.RuntimeException: An error occured while executing doInBackground()
            at android.os.AsyncTask$3.done(AsyncTask.java:300)
            at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
            at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
            at java.util.concurrent.FutureTask.run(FutureTask.java:242)
            at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
            at java.lang.Thread.run(Thread.java:841)
     Caused by: java.lang.NullPointerException
            at com.eproject.eproject.emobile.SearchTabs.SearchPeopleTab$GetSearchResults.doInBackground(SearchPeopleTab.java:78)
            at com.eproject.eproject.emobile.SearchTabs.SearchPeopleTab$GetSearchResults.doInBackground(SearchPeopleTab.java:63)

显示空指针的第 78 行指向这行代码:

SharedPreferences accPref = getActivity().getSharedPreferences(
                    "accPref", Context.MODE_PRIVATE);

看起来它现在无法从 AsyncTask 方法中获取 SharedPreferences。它以前工作得很好。有什么问题吗？

Answer 1

如果Async 类是Activity 中的非静态 内部类，那么您需要一个实例 为了实例化内部类。

你必须在 static 方法中这样调用:

SearchPeopleTab outerClass = new SearchPeopleTab(); //Outer class
        GetSearchResults task = outerClass.new GetSearchResults(requestSearch);
        task.execute();