如何更新我ListView中CheckBox項的顯示標記爲check？

Question

當我第一次運行我的應用時，我的ListView中的CheckBox項未選中。在我的layout.xml我有一個CheckBox以上我的ListView項目。當檢測到我的ListView以上的單個CheckBox被選中時，它應該將我的ListView中的所有CheckBox項標記爲選中狀態。我的下面的代碼不會更新我的ListView中CheckBox項的顯示，但當我試圖通過調用checkItem.isChecked()來獲取我ListView中每個CheckBox項的布爾值並讓它顯示在我的logcat中時，它將返回true。我錯過了什麼？

package com.usjr.sss.fragment; 

import java.util.ArrayList; 
import com.usjr.sss.R; 
import com.usjr.sss.activity.CourseFragmentActivity; 
import com.usjr.sss.adapter.InfoTechAdapter; 
import com.usjr.sss.adapter.SubjectDbAdapter; 
import android.database.Cursor; 
import android.os.Bundle; 
import android.support.v4.app.Fragment; 
import android.util.Log; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.view.ViewGroup; 
import android.widget.CheckBox; 
import android.widget.ListView; 
import android.widget.Toast; 

public class InfoTechFirstYearFragment extends Fragment { 

private CheckBox checkFirstYearFirstSem; 
private ListView listItFirstYearFirstSem; 
private ListView listItFirstYearSecondSem; 
private InfoTechAdapter infoTechAdapter; 

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

    return inflater.inflate(R.layout.fragment_it_first_year, container, 
      false); 
} 

@Override 
public void onActivityCreated(Bundle savedInstanceState) { 
    super.onActivityCreated(savedInstanceState); 
    Log.i("InfoTechFirstYearFragment", "onActivityCreated"); 

    listItFirstYearFirstSem = (ListView) getActivity().findViewById(
      R.id.listItFirstYearFirstSem); 
    listItFirstYearSecondSem = (ListView) getActivity().findViewById(
      R.id.listItFirstYearSecondSem); 
} 

@Override 
public void onStart() { 
    super.onStart(); 
    Log.i("InfoTechFirstYearFragment", "onStart"); 

    SubjectDbAdapter subjectDbAdapter = new SubjectDbAdapter(getActivity()); 
    subjectDbAdapter.open(); 

    Cursor cursor = subjectDbAdapter.fetchAllSubjects(); 
    ArrayList<String> arrayListSubject = new ArrayList<String>(); 
    ArrayList<String> arrayListFirstSem = new ArrayList<String>(); 
    ArrayList<String> arrayListSecondSem = new ArrayList<String>(); 

    while (cursor.moveToNext()) { 
     String subject = cursor.getString(cursor 
       .getColumnIndexOrThrow(SubjectDbAdapter.SUBJECT_ID)); 
     arrayListSubject.add(subject); 
    }// end while 

    subjectDbAdapter.close(); 

    int index; 

    /** 
    * 1st yr 1st sem 
    */ 
    for (index = 0; index < 9; index++) { 
     arrayListFirstSem.add(arrayListSubject.get(index)); 
    } 

    infoTechAdapter = new InfoTechAdapter(
      (CourseFragmentActivity) getActivity(), arrayListFirstSem); 
    listItFirstYearFirstSem.setAdapter(infoTechAdapter); 

    /** 
    * 1st yr 2nd sem 
    */ 
    for (index = 9; index < 18; index++) { 
     arrayListSecondSem.add(arrayListSubject.get(index)); 
    } 

    infoTechAdapter = new InfoTechAdapter(
      (CourseFragmentActivity) getActivity(), arrayListSecondSem); 
    listItFirstYearSecondSem.setAdapter(infoTechAdapter); 

    /** 
    * MARK ALL THE CHECKBOX AS CHECKED 
    */ 
    checkFirstYearFirstSem = (CheckBox) getActivity().findViewById(
      R.id.checkFirstYearFirstSem); 
    checkFirstYearFirstSem.setOnClickListener(new OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      if (checkFirstYearFirstSem.isChecked()) { 
       Toast.makeText(getActivity(), "ckecked", Toast.LENGTH_SHORT) 
         .show(); 
       int count = listItFirstYearFirstSem.getCount(); 
       for (int index = 0; index < count; index++) { 

        // View viewMy = 
        // listItFirstYearFirstSem.getChildAt(index); 
        // Object id = v.getTag(); 

        View viewItem = (View) listItFirstYearFirstSem 
          .getAdapter().getView(index, getView(), 
            listItFirstYearFirstSem); 
        CheckBox checkItem = (CheckBox) viewItem 
          .findViewById(R.id.subject); 
        checkItem.setChecked(true); 

        listItFirstYearFirstSem.setItemChecked(index, true); 

        infoTechAdapter.notifyDataSetChanged(); 
        Log.i("checkItem", 
          String.valueOf(checkItem.getText().toString())); 
        Log.i("checkItem", 
          String.valueOf(checkItem.isChecked())); 
       } 

      } else { 
       Toast.makeText(getActivity(), "unckecked", 
         Toast.LENGTH_SHORT).show(); 
      }// end if-else(checkFirstYearFirstSem.isChecked()) 
     }// end onClick 
    });// end OnClickListener 
}// end onStart() 
} 

Answer 1

我自己解決了！

而不是使用

View viewItem = (View) listItFirstYearFirstSem.getAdapter().getView(index, getView(), listItFirstYearFirstSem); 

我用

View viewItem = listItFirstYearFirstSem.getChildAt(index); 

然後

CheckBox checkItem = (CheckBox) viewMy.findViewById(R.id.subject); 
checkItem.setChecked(true);