java.lang.IllegalStateException:片段未附加到android中的Activity问题

在使用Fragment用法调用我的活动时,我遇到了一个奇怪的问题.我得到的错误就像,

java.lang.IllegalStateException:Fragment ScoreFragment {ee2b833 id = 0x7f0e0198}未附加到Activity

在第146行.我的片段代码有错误如下所示

if(mPageFlag.equalsIgnoreCase(getString(R.string.winners))){

我的完整代码如下,

 @Override
public void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
  if (getArguments() != null) {
    mPageFlag = getArguments().getString(ARG_PAGE_FLAG); 
  } 
}

@Override
public void setUserVisibleHint(boolean isVisibleToUser) {
    super.setUserVisibleHint(isVisibleToUser);
    if(isVisibleToUser && !mIsPageLoaded){
        mContext = getActivity();
        mIsPageLoaded = true;
        if(mPageFlag.equalsIgnoreCase(getString(R.string.winners))){
            new getcontestscorewinners(mContext).execute();
        }else{ //

            new getcontestscorewinnersNew(mContext).execute();
        }
    }
}


public class getcontestscorewinners extends AsyncTask {
    boolean response = false;

    private Context mContext;

    public getcontestscorewinners(Context context) {
        mContext = context;
    }

    @Override
    protected void onPreExecute() {

        progress = ProgressDialog.show(mContext, "Processing...",
                "Please wait....");
    }

    @Override
    protected String doInBackground(String... params) {

        NetworkTask.getContestScoreWinners(winnerHandler);


        return "";

    }

    @Override
    protected void onPostExecute(String result) {


    }

    @Override
    protected void onProgressUpdate(Void... values) {

    }
}

如果有人可以帮助我摆脱它,请告诉我.谢谢.

尝试使用 isAdded():

如果片段当前已添加到其活动,则返回true.

所以你的代码应该是这样的:

if(isAdded() && mPageFlag.equalsIgnoreCase(getString(R.string.winners))){