尝试替换片段时出错，片段事务中的活动已销毁

我试图用另一个片段替换我当前的片段，当我在一个可解释视图中单击一个图像时，当我单击该图像时，应用程序崩溃，并且logcat说这是由于活动被破坏而导致的。
主活动.java

public class MainActivity extends FragmentActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Check that the activity is using the layout version with
        // the fragment_container FrameLayout
        if (findViewById(R.id.fragment_container) != null) {

            // However, if we're being restored from a previous state,
            // then we don't need to do anything and should return or else
            // we could end up with overlapping fragments.
            if (savedInstanceState != null) {
                return;
            }

            // Create a new Fragment to be placed in the activity layout
            QuestionsFragment firstFragment = new QuestionsFragment();

            // In case this activity was started with special instructions from an
            // Intent, pass the Intent's extras to the fragment as arguments
            firstFragment.setArguments(getIntent().getExtras());

            // Add the fragment to the 'fragment_container' FrameLayout
            getFragmentManager().beginTransaction()
                    .add(R.id.fragment_container, firstFragment).commit();
        }

    }

    public void thanksFragment(){
        //Adicionando código responsável pela transição do
        //Fragmento para tela de agradecimento
        ThanksFragment thanks = new ThanksFragment();

        FragmentTransaction transaction = getFragmentManager().beginTransaction();
        // Replace whatever is in the fragment_container view with this fragment,
        // and add the transaction to the back stack if needed
        transaction.replace(R.id.fragment_container, thanks);
        transaction.addToBackStack(null);
        // Commit the transaction
        transaction.commit();
    }
}

问题碎片.java

public class QuestionsFragment extends Fragment{

    MyExpandableListAdapter listAdapter;
    ExpandableListView expListView;
    List<String> listDataHeader;
    HashMap<String, Emoticons> listDataChild;

    //private ArrayAdapter<String> mQuestionAdapter;

    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        View rootView = inflater.inflate(R.layout.questions_fragment, container, false);

        //Get the ListView
        expListView = (ExpandableListView) rootView.findViewById(R.id.list_view);

        //Prepare ListData
        prepareListData();

        listAdapter = new MyExpandableListAdapter(QuestionsFragment.this.getActivity().getApplicationContext(), listDataHeader, listDataChild);

        expListView.setAdapter(listAdapter);

        // Inflate the layout for this fragment
        return rootView;
    }

    /*
     * Preparing the list data
     */
    public void prepareListData() {

        listDataHeader = new ArrayList<String>();
        listDataChild = new HashMap<String, Emoticons>();

        // Adding child data
        listDataHeader.add("Rapidez e Eficiência no Check in:");
        listDataHeader.add("Rapidez e Eficiência no Check out:");
        listDataHeader.add("Cordialidade:");
        listDataHeader.add("Limpeza do Apartamento:");
        listDataHeader.add("Conforto do Apartamento:");
        listDataHeader.add("Artigos de Banho:");
        listDataHeader.add("Café da Manha:");
        listDataHeader.add("Refeições:");
        listDataHeader.add("Serviços de Internet:");
        listDataHeader.add("Serviços de Estacionamento:");

        // Adding child data
        listDataChild.put(listDataHeader.get(0), new Emoticons());
        listDataChild.put(listDataHeader.get(1),new Emoticons());
        listDataChild.put(listDataHeader.get(2),new Emoticons());
        listDataChild.put(listDataHeader.get(3),new Emoticons());
        listDataChild.put(listDataHeader.get(4),new Emoticons());
        listDataChild.put(listDataHeader.get(5),new Emoticons());
        listDataChild.put(listDataHeader.get(6),new Emoticons());
        listDataChild.put(listDataHeader.get(7),new Emoticons());
        listDataChild.put(listDataHeader.get(8),new Emoticons());
        listDataChild.put(listDataHeader.get(9),new Emoticons());

    }

}

myexpandablelistadapter.java文件

public class MyExpandableListAdapter extends BaseExpandableListAdapter {

    private static int img1;
    private static int img2;
    private static int img3;
    private static int img4;
    private static int img5;

    private Context _context;
    private List<String> _listDataHeader; // header titles
    // child data in format of header title, child title
    private HashMap<String, Emoticons> _listDataChild;

    public MyExpandableListAdapter(Context context, List<String> listDataHeader,
                                 HashMap<String, Emoticons> listChildData) {
        this._context = context;
        this._listDataHeader = listDataHeader;
        this._listDataChild = listChildData;

    }

    public long getChildId(int groupPosition, int childPosition) {
        return childPosition;
    }

    public View getChildView(int groupPosition, final int childPosition,
                             boolean isLastChild, View convertView, ViewGroup parent) {

        if (convertView == null) {
            LayoutInflater infalInflater = (LayoutInflater) this._context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = infalInflater.inflate(R.layout.emoticons_question_list_item, null);
        }

        //Linha Importante, pois instancio um objeto que receberá o valor do Objeto armazenado no HashMap
        final Emoticons getQuestionEmoticons = (Emoticons)_listDataChild.get(_listDataHeader.get(groupPosition));

        final ImageView imgBad = (ImageView) convertView.findViewById(R.id.image_bad);
        imgBad.setImageResource(getQuestionEmoticons.getImgBad());

        final ImageView imgBad2 = (ImageView) convertView.findViewById(R.id.image_bad2);
        imgBad2.setImageResource(getQuestionEmoticons.getImgBad2());

        final ImageView imgNormal = (ImageView) convertView.findViewById(R.id.image_normal);
        imgNormal.setImageResource(getQuestionEmoticons.getImgNormal());

        final ImageView imgGood = (ImageView) convertView.findViewById(R.id.image_good);
        imgGood.setImageResource(getQuestionEmoticons.getImgGood());

        final ImageView imgExcelent = (ImageView) convertView.findViewById(R.id.image_excelent);
        imgExcelent.setImageResource(getQuestionEmoticons.getImgExcelent());

        //Aqui foram adicionados os listners
        imgBad.setClickable(true);
        imgBad.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                getQuestionEmoticons.changeEmoticons(1);

                imgBad.setImageResource(getQuestionEmoticons.getImgBad());
                imgBad2.setImageResource(getQuestionEmoticons.getImgBad2());
                imgNormal.setImageResource(getQuestionEmoticons.getImgNormal());
                imgGood.setImageResource(getQuestionEmoticons.getImgGood());
                imgExcelent.setImageResource(getQuestionEmoticons.getImgExcelent());

                MainActivity main = new MainActivity();
                main.thanksFragment();
            }
        });

        imgBad2.setClickable(true);
        imgBad2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                getQuestionEmoticons.changeEmoticons(2);

                imgBad.setImageResource(getQuestionEmoticons.getImgBad());
                imgBad2.setImageResource(getQuestionEmoticons.getImgBad2());
                imgNormal.setImageResource(getQuestionEmoticons.getImgNormal());
                imgGood.setImageResource(getQuestionEmoticons.getImgGood());
                imgExcelent.setImageResource(getQuestionEmoticons.getImgExcelent());
            }
        });

        imgNormal.setClickable(true);
        imgNormal.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                getQuestionEmoticons.changeEmoticons(3);

                imgBad.setImageResource(getQuestionEmoticons.getImgBad());
                imgBad2.setImageResource(getQuestionEmoticons.getImgBad2());
                imgNormal.setImageResource(getQuestionEmoticons.getImgNormal());
                imgGood.setImageResource(getQuestionEmoticons.getImgGood());
                imgExcelent.setImageResource(getQuestionEmoticons.getImgExcelent());
            }
        });

        imgGood.setClickable(true);
        imgGood.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                getQuestionEmoticons.changeEmoticons(4);

                imgBad.setImageResource(getQuestionEmoticons.getImgBad());
                imgBad2.setImageResource(getQuestionEmoticons.getImgBad2());
                imgNormal.setImageResource(getQuestionEmoticons.getImgNormal());
                imgGood.setImageResource(getQuestionEmoticons.getImgGood());
                imgExcelent.setImageResource(getQuestionEmoticons.getImgExcelent());
            }
        });

        imgExcelent.setClickable(true);
        imgExcelent.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                getQuestionEmoticons.changeEmoticons(5);

                imgBad.setImageResource(getQuestionEmoticons.getImgBad());
                imgBad2.setImageResource(getQuestionEmoticons.getImgBad2());
                imgNormal.setImageResource(getQuestionEmoticons.getImgNormal());
                imgGood.setImageResource(getQuestionEmoticons.getImgGood());
                imgExcelent.setImageResource(getQuestionEmoticons.getImgExcelent());
            }
        });

          return convertView;
    }

    public Object getGroup(int groupPosition) {
        return this._listDataHeader.get(groupPosition);
    }

    @Override
    public Object getChild(int groupPosition, int childPosition) {
        return null;
    }

    public int getGroupCount() {
        return this._listDataHeader.size();
    }

    @Override
    public int getChildrenCount(int groupPosition) {
        return 1;
    }

    public long getGroupId(int groupPosition) {
        return groupPosition;
    }

    public View getGroupView(int groupPosition, boolean isExpanded,
                             View convertView, ViewGroup parent) {
        String headerTitle = (String) getGroup(groupPosition);
        if (convertView == null) {
            LayoutInflater infalInflater = (LayoutInflater) this._context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = infalInflater.inflate(R.layout.question_list_item, null);
        }

        TextView txtListGroup = (TextView) convertView
                .findViewById(R.id.question_list_item_textview);
        txtListGroup.setText(headerTitle);

        return convertView;
    }

    public boolean hasStableIds() {
        return false;
    }

    public boolean isChildSelectable(int groupPosition, int childPosition) {
        return true;
    }

}

我得到的错误是：

FATAL EXCEPTION: main
                                                                              Process: br.ind.uptech.princessfeedback, PID: 6631
                                                                              java.lang.IllegalStateException: Activity has been destroyed
                                                                                  at android.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1365)
                                                                                  at android.app.BackStackRecord.commitInternal(BackStackRecord.java:729)
                                                                                  at android.app.BackStackRecord.commit(BackStackRecord.java:705)
                                                                                  at br.ind.uptech.princessfeedback.MainActivity.thanksFragment(MainActivity.java:54)
                                                                                  at 

    br.ind.uptech.princessfeedback.MyExpandableListAdapter$1.onClick(MyExpandableListAdapter.java:96)
                                                                                      at android.view.View.performClick(View.java:5242)
                                                                                      at android.view.View$PerformClick.run(View.java:21156)
                                                                                      at android.os.Handler.handleCallback(Handler.java:739)
                                                                                      at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                                      at android.os.Looper.loop(Looper.java:145)
                                                                                      at android.app.ActivityThread.main(ActivityThread.java:6862)
                                                                                      at java.lang.reflect.Method.invoke(Native Method)
                                                                                      at java.lang.reflect.Method.invoke(Method.java:372)
                                                                                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
                                                                                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)

非常感谢！

尝试替换片段时出错，片段事务中的活动已销毁

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