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,我需要像我的其他一些过程那样.

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解决方案工作,但它一旦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);

看起来现在无法从AsyncTask方法获取SharedPreferences.之前运作良好.这有什么问题？

Answer 1

如果Asyncclass是non-static你内部的一个内部类Activity,那么你需要一个instance封闭类来instantiate实现inner class.

你必须在方法内部调用这样的方式static:

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