IndexOutOfBoundException在Expanda

IndexOutOfBoundException在Expanda

本文介绍了IndexOutOfBoundException在ExpandableListView的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我发现了很多关于这个问题的问题,但我不能修复它。我有一整天我没能解决消费。我重新检查我的循环还

如果我有亲值7,如果我在第4父单击它的膨胀和我再次对2号母单击其消费和工作的罚款。但如果我点击第五或第六或第七父我得到这个错误..我不知道我错了,在我的code ..

LogCat中:

  11月7日至12日:56:24.504:E / AndroidRuntime(3548):致命异常:主要
11月7日至12日:56:24.504:E / AndroidRuntime(3548):java.lang.IndexOutOfBoundsException:无效指数1,大小为0
11月7日至12日:56:24.504:E / AndroidRuntime(3548):在java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:251)
11月7日至12日:56:24.504:E / AndroidRuntime(3548):在java.util.ArrayList.add(ArrayList.java:143)
11月7日至12日:56:24.504:E / AndroidRuntime(3548):在android.widget.ExpandableListConnector.expandGroup(ExpandableListConnector.java:685)
11月7日至12日:56:24.504:E / AndroidRuntime(3548):在android.widget.ExpandableListView.handleItemClick(ExpandableListView.java:562)
11月7日至12日:56:24.504:E / AndroidRuntime(3548):在android.widget.ExpandableListView.performItemClick(ExpandableListView.java:522)
11月7日至12日:56:24.504:E / AndroidRuntime(3548):在android.widget.AbsListView $ PerformClick.run(AbsListView.java:2812)
11月7日至12日:56:24.504:E / AndroidRuntime(3548):在android.widget.AbsListView $ 1.run(AbsListView.java:3571)
11月7日至12日:56:24.504:E / AndroidRuntime(3548):在android.os.Handler.handleCallback(Handler.java:725)
11月7日至12日:56:24.504:E / AndroidRuntime(3548):在android.os.Handler.dispatchMessage(Handler.java:92)
11月7日至12日:56:24.504:E / AndroidRuntime(3548):在android.os.Looper.loop(Looper.java:153)
11月7日至12日:56:24.504:E / AndroidRuntime(3548):在android.app.ActivityThread.main(ActivityThread.java:5297)
11月7日至12日:56:24.504:E / AndroidRuntime(3548):在java.lang.reflect.Method.invokeNative(本机方法)
11月7日至12日:56:24.504:E / AndroidRuntime(3548):在java.lang.reflect.Method.invoke(Method.java:511)
11月7日至12日:56:24.504:E / AndroidRuntime(3548):在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:833)
11月7日至12日:56:24.504:E / AndroidRuntime(3548):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
11月7日至12日:56:24.504:E / AndroidRuntime(3548):在dalvik.system.NativeStart.main(本机方法)

的Java

  mAdapter =新MyExpandableListAdapter(MainActivity.this,listchapt,
                空值);        elvForDialog.setIndicatorBounds(宽 - 20,宽度); // 130
        elvForDialog.setAdapter(mAdapter);        elvForDialog.setOnGroupClickListener(新OnGroupClickListener(){            公共布尔onGroupClick(ExpandableListView为arg0,ARG1查看,
                    INT ARG2,长ARG3)抛出的RuntimeException {
                字符串POS =(字符串)mAdapter.getGroup(ARG2);
                的System.out.println(位置+ POS)
                清单<串GT;孩子=新的ArrayList<串GT;();
                children.clear();
                listNames.clear();
                的for(int i = 0; I< listchapt.size();我++){                    dbHelper.openDataBase();
                    孩子= dbHelper.GetSubchapt(POS)
                    dbHelper.close();
                    listNames.add(儿童); //线143号
                }                的System.out.println(位置+ POS)
                显示newDisplay = getWindowManager()getDefaultDisplay()。
                INT宽度= newDisplay.getWidth();
                mAdapter =新MyExpandableListAdapter(MainActivity.this,
                        listchapt,listNames);
                elvForDialog.setIndicatorBounds(宽 - 20,宽度); // 130
                elvForDialog.setAdapter(mAdapter);
                的System.out.println(explist+ listSubchapt);                尝试{                    Log.v(LH,ssetOnGroupClickListener);
                    Log.v(LH,+ viewListLastSelected.toString());
                    Log.v(LH
                            +((TextView的)viewListLastSelected).getText());                }赶上(例外五){
                    Log.v(LH,ERROR @的onCreate:+ e.toString());
                }
                返回false;
            }
        });        elvForDialog.setOnChildClickListener(新OnChildClickListener(){            公共布尔onChildClick(ExpandableListView为arg0,ARG1查看,
                    INT ARG2,诠释ARG3,长ARG4)抛出的RuntimeException {                currentChapt = listchapt.get(ARG2)的ToString();
                currentSubchapt = listNames.get(ARG2)获得(参数3)的ToString();
                的System.out.println(是它显示子+ currentChapt
                        + currentSubchapt);
                // createExpandableListViewDialog(1);                在意向=新意图(MainActivity.this,WebContent.class);
                in.putExtra(chapterid,currentChapt);
                in.putExtra(subchaptid,currentSubchapt);
                startActivity(在);                elvForDialog.clearChildFocus(viewListLastSelected);                尝试{                    viewListLastSelected.setBackgroundDrawable(NULL);
                    ((的TextView)viewListLastSelected).setTextColor(Color.GRAY);
                }赶上(例外五){
                }
                ((的TextView)ARG1).setTextColor(Color.WHITE);
                viewListLastSelected = ARG1;                返回false;
            }
        });        elvForDialog.setOnGroupExpandListener(新OnGroupExpandListener(){            公共无效onGroupExpand(INT groupPosition){
                INT LEN = mAdapter.getGroupCount();                的for(int i = 0; I< LEN,我++){
                    如果(我!= groupPosition){
                        elvForDialog.collapseGroup(ⅰ);
                    }
                }
            }        });

MyAdapter类

 公共类MyExpandableListAdapter扩展BaseExpandableListAdapter {
    活动活动;
    清单<串GT; listGroup =新的ArrayList<串GT;();
    清单<名单,LT;弦乐>> listChild =新的ArrayList<名单,LT;弦乐>>();    私人INT _posGroup = 0;
    私人INT _posChild = 0;    公共MyExpandableListAdapter(活动一,表<弦乐基团,名单,LT;名单<串GT;>儿童){
        超();
        活性=一个;
        listGroup =组;
        listChild =儿童;
    }
    公共对象getChild(INT groupPosition,诠释childPosition){
        返回listChild.get(groupPosition)获得(childPosition);
    }
    众长getChildId(INT groupPosition,诠释childPosition){
        //Log.v(\"LH,childID的:+ childPosition);
        _posGroup = groupPosition;
        _posChild = childPosition;
        返回childPosition;
    }
    公众诠释getChildrenCount(INT groupPosition){
        返回listChild.get(groupPosition).size(); //行没有51
    }
    公共查看getChildView(INT groupPosition,诠释childPosition,
            布尔isLastChild,查看convertView,父母的ViewGroup){
        串串= listChild.get(groupPosition)获得(childPosition);
        查看查看= getGenericChildView(字符串);        TextView的文本=(TextView的)视图。
        如果(this._posGroup == groupPosition&放大器;&安培;
                   this._posChild == childPosition)
                {
                    text.setTextColor(Color.rgb(85,85,85));
                    text.setTypeface(NULL,Typeface.BOLD);
                }
       view.setBackgroundResource(R.drawable.menu_submenubg);        返回视图。
    }
    //组方法存根    公共对象getGroup(INT groupPosition){
        返回listGroup.get(groupPosition);
    }    公众诠释getGroupCount(){
        返回listGroup.size();
    }
    众长getGroupId(INT groupPosition){
        //Log.v(\"LH,组ID:+ groupPosition);
        返回groupPosition;
    }
    公共查看getGroupView(INT groupPosition,布尔isExpanded,
            查看convertView,父母的ViewGroup){
        串串= listGroup.get(groupPosition);
        查看结果= getGenericGroupView(字符串);
        result.setBackgroundResource(R.drawable.menu_hoverbg);
        返回结果;
    }    公众的TextView getGenericChildView(String s)将{
        AbsListView.LayoutParams LP =新AbsListView.LayoutParams(
                ViewGroup.LayoutParams.FILL_PARENT,0);
        lp.height = 73; // 73,50
        TextView的文本=新的TextView(活动);
        text.setLayoutParams(LP);
        text.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
        text.setPadding(50,0,0,0);
        text.setTextColor(Color.rgb(85,85,85));
        text.setTypeface(NULL,Typeface.BOLD);
        text.setTextSize(15);
        text.setText(多个);
        返回文本;
    }
    公众的TextView getGenericGroupView(String s)将{
        AbsListView.LayoutParams LP =新AbsListView.LayoutParams(
                ViewGroup.LayoutParams.FILL_PARENT,0);
        lp.height = 60;
        TextView的文本=新的TextView(活动);
        text.setLayoutParams(LP);
        text.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
        text.setPadding(20,0,0,0);
        text.setTextSize(20);
        text.setTextColor(Color.WHITE);
        text.setText(多个);
        返回文本;
    }
    公共布尔hasStableIds(){
        返回false;
    }
    公共布尔isChildSelectable(INT groupPosition,诠释childPosition){
        返回true;
    }

感谢提前..

修改:
DBHelper

 公共类DBHelper扩展SQLiteOpenHelper {
    公众诠释GetCursor;
    私人语境myContext;
    公共字符串DB_PATH =数据/数据​​/ com.redcaso.mia /数据库/; //路径    公共静态字符串DB_NAME =Test.sqlite; //你的数据库名称
    静态字符串ASSETS_DB_FOLDER =DB;
    私人SQLiteDatabase分贝;    公共DBHelper(上下文的背景下){
        超级(上下文,DB_NAME,空,2);
        如果(DB = NULL&放大器;!&安培; db.isOpen())
            关();        this.myContext =背景;
        // DB_NAME = DB_NAME;        尝试{
            的CreateDatabase();
            的openDatabase();
        }赶上(IOException异常五){
            //的System.out.println(异常创作的数据库:+
            // e.getMessage());
            e.printStackTrace();
        }    }    公共无效的CreateDatabase()抛出IOException
        布尔dbExist = checkDataBase();        如果(dbExist){
            //的System.out.println(数据库中不存在);
        }其他{
            this.getReadableDatabase();            尝试{
                copyDatabase();
            }赶上(IOException异常五){
                抛出新的错误(错误复制数据库);
            }
        }
    }    私人无效copyDatabase()抛出IOException
        输入的InputStream = myContext.getAssets()开(DB_NAME)。
        字符串outputFileName = DB_PATH + DB_NAME;
        OutputStream的输出=新的FileOutputStream(outputFileName);        字节[]缓冲区=新的字节[1024];
        INT长;
        而((长度= input.read(缓冲液))大于0){
            output.write(缓冲液,0,长度);
        }        //关闭流
        output.flush();
        output.close();
        input.close();
        //的System.out.println(DB_NAME +数据库复制!);
    }    @覆盖
    公共无效的onCreate(SQLiteDatabase DB){    }    @覆盖
    公共无效onUpgrade(SQLiteDatabase分贝,INT oldVersion,诠释静态网页){    }    公共无效的openDatabase()抛出的SQLException {
        //打开数据库
        字符串mypath中= DB_PATH + DB_NAME;
        DB = SQLiteDatabase.openDatabase(mypath中,空,
                SQLiteDatabase.OPEN_READWRITE);
    }    公共布尔isOpen会(){
        如果(DB!= NULL)
            返回db.isOpen();
        返回false;
    }    @覆盖
    公共同步无效的close(){
        如果(DB!= NULL)
            db.close();
        super.close();
    }    私人布尔checkDataBase(){
        SQLiteDatabase CHECKDB = NULL;
        尝试{
            字符串mypath中= DB_PATH + DB_NAME;
            CHECKDB = SQLiteDatabase.openDatabase(mypath中,空,
                    SQLiteDatabase.OPEN_READWRITE);        }赶上(例外五){
            //数据库开不存在。
        }        如果(CHECKDB!= NULL){
            checkDB.close();
        }        返回CHECKDB!= NULL?真假;
    }    公共光标execCursorQuery(SQL字符串){
        光标光标= NULL;
        尝试{
            光标= db.rawQuery(SQL,NULL);
            GetCursor = cursor.getCount();
            Log.i(内部execCursorQuery尝试,SQL);
        }赶上(例外五){
            Log.i(内部execCursorQuery异常,e.getMessage());
        }
        返回游标;
    }    公共无效execNonQuery(SQL字符串){
        尝试{
            db.execSQL(SQL);
            // Log.d(SQL,SQL);
        }赶上(例外五){
            // Log.e(ERR,e.getMessage());
        } {最后
            // closeDb();
        }
    }    公众的ArrayList<串GT; GetchapterID(){
        SQL字符串=;
            //System.out.println(\"Inside数据库);
            SQL =选择不同的(ChapterId)的内容;        ArrayList的<串GT;名单=新的ArrayList<串GT;();
        光标光标= db.rawQuery(SQL,NULL);        尝试{
        如果(指针!= NULL){
        如果(cursor.moveToFirst()){
            做{
                list.add(cursor.getString(0));
            }
            而(cursor.moveToNext());
        }
        如果(光标=空&放大器;!&放大器;!cursor.isClosed()){
            cursor.close();
        }
        }
     其他
            Toast.makeText(myContext,在DB没有价值,Toast.LENGTH_SHORT).show();
        }
        赶上(例外五){
            的System.out.println(GetGradeNames():+ E);
        }
        返回列表;
    }
    公众的ArrayList<串GT; GetSubchapt(字符串类型){
        SQL字符串=;
            SQL =选择的内容不同(SubchapterId),其中ChapterId ='+类型+';        ArrayList的<串GT;名单=新的ArrayList<串GT;();
        光标光标= db.rawQuery(SQL,NULL);        尝试{
        如果(指针!= NULL){
        如果(cursor.moveToFirst()){
            做{
                list.add(cursor.getString(0));
            }
            而(cursor.moveToNext());
        }
        如果(光标=空&放大器;!&放大器;!cursor.isClosed()){
            cursor.close();
        }
        }
     其他
            Toast.makeText(myContext,没有财产的DB,Toast.LENGTH_SHORT).show();
        }
        赶上(例外五){
            的System.out.println(GetLevelNames():+ E);
        }
        返回列表;
    }
    公众的ArrayList<串GT;的GetName(章字符串,字符串subchapt){
        SQL字符串=;
            SQL ='+ subchapt +和ChapterId ='+章+',从那里SubchapterId =内容选择不同的(文件名)';        ArrayList的<串GT;名单=新的ArrayList<串GT;();
        光标光标= db.rawQuery(SQL,NULL);
        //list.add(\"All主题 - 整个+级);
        尝试{
        如果(指针!= NULL){
        如果(cursor.moveToFirst()){
            做{
                list.add(cursor.getString(0));
            }
            而(cursor.moveToNext());
        }
        如果(光标=空&放大器;!&放大器;!cursor.isClosed()){
            cursor.close();
        }
        }
     其他
            Toast.makeText(myContext,在DB没有地址,Toast.LENGTH_SHORT).show();
        }
        赶上(例外五){
            //System.out.println(GetBasicTopicNames():+ E);
        }
        返回列表;
    }


解决方案

您错了存储你的孩子,你不必每次添加新的儿童时重新创建您的适配器。

下面是一些修正,让您的code功能:

更改适配器的构造函数,所以它只能接收活动和组:

 公共MyExpandableListAdapter(活动一,表<弦乐基团){
    this.activity =一个;
    this.listGroup =组;
}

更改您的孩子列表的类型,因此您可以通过groupPosition访问它们,就像这样:

  SparseArray<名单,LT;弦乐>> listChild =新SparseArray<名单,LT;弦乐>>();

现在创建它增加了儿童的适配器内部的新方法:

 公共addChildren(INT groupPosition,列表与LT;弦乐>儿童){
    this.listChild.put(groupPosition,子女);
}

现在该适配器的照顾,解决您的OnGroupClick事件。不是每次都设置新的适配器,添加或删除的儿童(根据是否已存在的儿童):

  expList.setOnGroupClickListener(新ExpandableListView.OnGroupClickListener(){
    @覆盖
    公共布尔onGroupClick(ExpandableListView父视图V,INT groupPosition,长ID){
        如果(mAdapter.getChildrenCount == 0){
            dbHelper.openDataBase();
            孩子= dbHelper.GetSubchapt(POS)
            dbHelper.close();
            mAdapter.addChildren(groupPosition,子女);
        }
        其他
            mAdapter.removeChildren(groupPosition);
        返回false;
    }
});

群组相关事件现在已修正。剩下的就是调整getChildrenCount方法,这样就不会抛出NPE:

 公众诠释getChildrenCount(INT groupPosition){
    如果(listChild.get(groupPosition)== NULL){
        Log.e(mAdapter.getChildrenCount,试图访​​问组的+
        groupPosition +尚未被添加儿童!);
        返回0;
    }
    其他
        返回listChild.get(groupPosition).size();
}

发表任何可能出现进一步的错误,因为这code未与您的设置进行测试。

I found a lot of question about this problem, but I can't fix it. I have spend a whole day i couldn't solve. I rechecked my for loop also

If i have parent value 7 if i click on 4th parent its expands and again i click on 2nd parent its expends and working fine. but if i click 5th or 6th or 7th parent i am getting this error.. i don't know where i am wrong in my code..

LogCat :

07-12 11:56:24.504: E/AndroidRuntime(3548): FATAL EXCEPTION: main
07-12 11:56:24.504: E/AndroidRuntime(3548): java.lang.IndexOutOfBoundsException: Invalid index 1, size is 0
07-12 11:56:24.504: E/AndroidRuntime(3548):     at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:251)
07-12 11:56:24.504: E/AndroidRuntime(3548):     at java.util.ArrayList.add(ArrayList.java:143)
07-12 11:56:24.504: E/AndroidRuntime(3548):     at android.widget.ExpandableListConnector.expandGroup(ExpandableListConnector.java:685)
07-12 11:56:24.504: E/AndroidRuntime(3548):     at android.widget.ExpandableListView.handleItemClick(ExpandableListView.java:562)
07-12 11:56:24.504: E/AndroidRuntime(3548):     at android.widget.ExpandableListView.performItemClick(ExpandableListView.java:522)
07-12 11:56:24.504: E/AndroidRuntime(3548):     at android.widget.AbsListView$PerformClick.run(AbsListView.java:2812)
07-12 11:56:24.504: E/AndroidRuntime(3548):     at android.widget.AbsListView$1.run(AbsListView.java:3571)
07-12 11:56:24.504: E/AndroidRuntime(3548):     at android.os.Handler.handleCallback(Handler.java:725)
07-12 11:56:24.504: E/AndroidRuntime(3548):     at android.os.Handler.dispatchMessage(Handler.java:92)
07-12 11:56:24.504: E/AndroidRuntime(3548):     at android.os.Looper.loop(Looper.java:153)
07-12 11:56:24.504: E/AndroidRuntime(3548):     at android.app.ActivityThread.main(ActivityThread.java:5297)
07-12 11:56:24.504: E/AndroidRuntime(3548):     at java.lang.reflect.Method.invokeNative(Native Method)
07-12 11:56:24.504: E/AndroidRuntime(3548):     at java.lang.reflect.Method.invoke(Method.java:511)
07-12 11:56:24.504: E/AndroidRuntime(3548):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
07-12 11:56:24.504: E/AndroidRuntime(3548):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
07-12 11:56:24.504: E/AndroidRuntime(3548):     at dalvik.system.NativeStart.main(Native Method)

Java

mAdapter = new MyExpandableListAdapter(MainActivity.this, listchapt,
                null);

        elvForDialog.setIndicatorBounds(width - 20, width);// 130
        elvForDialog.setAdapter(mAdapter);

        elvForDialog.setOnGroupClickListener(new OnGroupClickListener() {

            public boolean onGroupClick(ExpandableListView arg0, View arg1,
                    int arg2, long arg3) throws RuntimeException {
                String pos = (String)mAdapter.getGroup(arg2);
                System.out.println("position" + pos);
                List<String> children = new ArrayList<String>();
                children.clear();
                listNames.clear();
                for (int i = 0; i < listchapt.size(); i++) {

                    dbHelper.openDataBase();
                    children = dbHelper.GetSubchapt(pos);
                    dbHelper.close();
                    listNames.add(children);  // line no.143
                }

                System.out.println("position" + pos);
                Display newDisplay = getWindowManager().getDefaultDisplay();
                int width = newDisplay.getWidth();
                mAdapter = new MyExpandableListAdapter(MainActivity.this,
                        listchapt, listNames);
                elvForDialog.setIndicatorBounds(width - 20, width);// 130
                elvForDialog.setAdapter(mAdapter);
                System.out.println("explist" + listSubchapt);

                try {

                    Log.v("LH", "ssetOnGroupClickListener");
                    Log.v("LH", "" + viewListLastSelected.toString());
                    Log.v("LH",
                            "" + ((TextView) viewListLastSelected).getText());

                } catch (Exception e) {
                    Log.v("LH", "ERROR@onCreate: " + e.toString());
                }
                return false;
            }
        });

        elvForDialog.setOnChildClickListener(new OnChildClickListener() {

            public boolean onChildClick(ExpandableListView arg0, View arg1,
                    int arg2, int arg3, long arg4) throws RuntimeException {

                currentChapt = listchapt.get(arg2).toString();
                currentSubchapt = listNames.get(arg2).get(arg3).toString();
                System.out.println("Yes it shows child " + currentChapt
                        + currentSubchapt);
                // createExpandableListViewDialog(1);

                Intent in = new Intent(MainActivity.this, WebContent.class);
                in.putExtra("chapterid", currentChapt);
                in.putExtra("subchaptid", currentSubchapt);
                startActivity(in);

                elvForDialog.clearChildFocus(viewListLastSelected);

                try {

                    viewListLastSelected.setBackgroundDrawable(null);
                    ((TextView) viewListLastSelected).setTextColor(Color.GRAY);
                } catch (Exception e) {
                }
                ((TextView) arg1).setTextColor(Color.WHITE);
                viewListLastSelected = arg1;

                return false;
            }
        });

        elvForDialog.setOnGroupExpandListener(new OnGroupExpandListener() {

            public void onGroupExpand(int groupPosition) {
                int len = mAdapter.getGroupCount();

                for (int i = 0; i < len; i++) {
                    if (i != groupPosition) {
                        elvForDialog.collapseGroup(i);
                    }
                }
            }

        });

MyAdapter class

public class MyExpandableListAdapter extends BaseExpandableListAdapter {
    Activity activity;
    List<String> listGroup = new ArrayList<String>();
    List<List<String>> listChild = new ArrayList<List<String>>();

    private int _posGroup = 0;
    private int _posChild = 0;



    public MyExpandableListAdapter(Activity a, List<String> group, List<List<String>> children){
        super();
        activity = a;
        listGroup = group;
        listChild = children;
    }


    public Object getChild(int groupPosition, int childPosition) {
        return listChild.get(groupPosition).get(childPosition);
    }


    public long getChildId(int groupPosition, int childPosition) {
        //Log.v("LH", "ChildID: " + childPosition);
        _posGroup = groupPosition;
        _posChild = childPosition;
        return childPosition;
    }


    public int getChildrenCount(int groupPosition) {
        return listChild.get(groupPosition).size();    //line no 51
    }


    public View getChildView(int groupPosition, int childPosition,
            boolean isLastChild, View convertView, ViewGroup parent) {
        String string = listChild.get(groupPosition).get(childPosition);
        View view = getGenericChildView(string);

        TextView text = (TextView) view;
        if(this._posGroup==groupPosition &&
                   this._posChild==childPosition)
                {
                    text.setTextColor(Color.rgb(85, 85, 85));
                    text.setTypeface(null, Typeface.BOLD);
                }
       view.setBackgroundResource(R.drawable.menu_submenubg);

        return view;
    }


    //group method stub

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

    public int getGroupCount() {
        return listGroup.size();
    }


    public long getGroupId(int groupPosition) {
        //Log.v("LH", "GroupID: " + groupPosition);
        return groupPosition;
    }


    public View getGroupView(int groupPosition, boolean isExpanded,
            View convertView, ViewGroup parent) {
        String string = listGroup.get(groupPosition);
        View result=getGenericGroupView(string);
        result.setBackgroundResource(R.drawable.menu_hoverbg);
        return result;
    }

    public TextView getGenericChildView(String s) {
        AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
                ViewGroup.LayoutParams.FILL_PARENT, 0);
        lp.height=73; //73,50
        TextView text = new TextView(activity);
        text.setLayoutParams(lp);
        text.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
        text.setPadding(50, 0, 0, 0);
        text.setTextColor(Color.rgb(85, 85, 85));
        text.setTypeface(null, Typeface.BOLD);
        text.setTextSize(15);
        text.setText(s);
        return text;
    }


    public TextView getGenericGroupView(String s) {
        AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
                ViewGroup.LayoutParams.FILL_PARENT, 0);
        lp.height=60;
        TextView text = new TextView(activity);
        text.setLayoutParams(lp);
        text.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
        text.setPadding(20, 0, 0, 0);
        text.setTextSize(20);
        text.setTextColor(Color.WHITE);
        text.setText(s);
        return text;
    }


    public boolean hasStableIds() {
        return false;
    }


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

Thank in advance..

Edit :DBHelper

public class DBHelper extends SQLiteOpenHelper {
    public int GetCursor;
    private Context myContext;
    public String DB_PATH = "data/data/com.redcaso.mia/databases/"; // path

    public static String DB_NAME = "Test.sqlite";// your database name
    static String ASSETS_DB_FOLDER = "db";
    private SQLiteDatabase db;

    public DBHelper(Context context) {
        super(context, DB_NAME, null, 2);
        if (db != null && db.isOpen())
            close();

        this.myContext = context;
        //DB_NAME = db_name;

        try {
            createDataBase();
            openDataBase();
        } catch (IOException e) {
            // System.out.println("Exception in creation of database : "+
            // e.getMessage());
            e.printStackTrace();
        }

    }



    public void createDataBase() throws IOException {
        boolean dbExist = checkDataBase();

        if (dbExist) {
            // System.out.println("Database Exist");
        } else {
            this.getReadableDatabase();

            try {
                copyDatabase();
            } catch (IOException e) {
                throw new Error("Error copying database");
            }
        }
    }

    private void copyDatabase() throws IOException {
        InputStream input = myContext.getAssets().open(DB_NAME);
        String outputFileName = DB_PATH + DB_NAME;
        OutputStream output = new FileOutputStream(outputFileName);

        byte[] buffer = new byte[1024];
        int length;
        while ((length = input.read(buffer)) > 0) {
            output.write(buffer, 0, length);
        }

        // Close the streams
        output.flush();
        output.close();
        input.close();
        // System.out.println(DB_NAME + "Database Copied !");
    }

    @Override
    public void onCreate(SQLiteDatabase db) {

    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

    }

    public void openDataBase() throws SQLException {
        // Open the database
        String myPath = DB_PATH + DB_NAME;
        db = SQLiteDatabase.openDatabase(myPath, null,
                SQLiteDatabase.OPEN_READWRITE);
    }

    public boolean isOpen() {
        if (db != null)
            return db.isOpen();
        return false;
    }

    @Override
    public synchronized void close() {
        if (db != null)
            db.close();
        super.close();
    }

    private boolean checkDataBase() {
        SQLiteDatabase checkDB = null;
        try {
            String myPath = DB_PATH + DB_NAME;
            checkDB = SQLiteDatabase.openDatabase(myPath, null,
                    SQLiteDatabase.OPEN_READWRITE);

        } catch (Exception e) {
            // database does't exist yet.
        }

        if (checkDB != null) {
            checkDB.close();
        }

        return checkDB != null ? true : false;
    }

    public Cursor execCursorQuery(String sql) {
        Cursor cursor = null;
        try {
            cursor = db.rawQuery(sql, null);
            GetCursor = cursor.getCount();
            Log.i("Inside execCursorQuery try", sql);
        } catch (Exception e) {
            Log.i("Inside execCursorQuery exception", e.getMessage());
        }
        return cursor;
    }

    public void execNonQuery(String sql) {
        try {
            db.execSQL(sql);
            // Log.d("SQL", sql);
        } catch (Exception e) {
            // Log.e("Err", e.getMessage());
        } finally {
            // closeDb();
        }
    }

    public ArrayList<String> GetchapterID(){
        String sql="";
            //System.out.println("Inside Database");
            sql="select distinct(ChapterId) from contents";

        ArrayList<String> list = new ArrayList<String>();
        Cursor cursor=db.rawQuery(sql, null);

        try{
        if(cursor != null){
        if (cursor.moveToFirst()) {
            do {
                list.add(cursor.getString(0));
            }
            while (cursor.moveToNext());
        }
        if (cursor != null && !cursor.isClosed()) {
            cursor.close();
        }
        }
     else
            Toast.makeText(myContext, "No values in DB", Toast.LENGTH_SHORT).show();
        }
        catch(Exception e){
            System.out.println("GetGradeNames(): " +e);
        }
        return list;
    }
    public ArrayList<String> GetSubchapt(String type){
        String sql="";
            sql="select distinct(SubchapterId) from contents where ChapterId='"+type+"'";

        ArrayList<String> list = new ArrayList<String>();
        Cursor cursor=db.rawQuery(sql, null);

        try{
        if(cursor != null){
        if (cursor.moveToFirst()) {
            do {
                list.add(cursor.getString(0));
            }
            while (cursor.moveToNext());
        }
        if (cursor != null && !cursor.isClosed()) {
            cursor.close();
        }
        }
     else
            Toast.makeText(myContext, "No Property in DB", Toast.LENGTH_SHORT).show();
        }
        catch(Exception e){
            System.out.println("GetLevelNames(): " +e);
        }
        return list;
    }
    public ArrayList<String> GetName(String chapter,String subchapt){
        String sql="";
            sql="select distinct(filename) from contents where SubchapterId='"+subchapt+"' and ChapterId='"+chapter+"'";

        ArrayList<String> list = new ArrayList<String>();
        Cursor cursor=db.rawQuery(sql, null);
        //list.add("All Topics - Entire "+grade);
        try{
        if(cursor != null){
        if (cursor.moveToFirst()) {
            do {
                list.add(cursor.getString(0));
            }
            while (cursor.moveToNext());
        }
        if (cursor != null && !cursor.isClosed()) {
            cursor.close();
        }
        }
     else
            Toast.makeText(myContext, "No Address in DB", Toast.LENGTH_SHORT).show();
        }
        catch(Exception e){
            //System.out.println("GetBasicTopicNames(): " +e);
        }
        return list;
    }
解决方案

You are storing your children wrong and you don't have to re-create your adapter every time you add new children.

Here are some fixes to get your code functional:

Change your adapters constructor to, so it receives only activity and groups:

public MyExpandableListAdapter(Activity a, List<String> group){
    this.activity = a;
    this.listGroup = group;
}

Change the type of your children list, so you can access them by groupPosition, like this:

SparseArray<List<String>> listChild = new SparseArray<List<String>>();

Now create a new method inside the adapter which adds children:

public addChildren(int groupPosition, List<String> children) {
    this.listChild.put(groupPosition, children);
}

Now that the adapter is taken care of, fix your OnGroupClick event. Instead of setting a new adapter each time, add or remove the children (based on whether the children already exist):

expList.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
    @Override
    public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {
        if (mAdapter.getChildrenCount == 0) {
            dbHelper.openDataBase();
            children = dbHelper.GetSubchapt(pos);
            dbHelper.close();
            mAdapter.addChildren(groupPosition, children);
        }
        else
            mAdapter.removeChildren(groupPosition);
        return false;
    }
});

GroupClick event has been fixed now. What's left is to adjust your getChildrenCount method so it wouldn't throw a NPE:

public int getChildrenCount(int groupPosition) {
    if (listChild.get(groupPosition) == null) {
        Log.e("mAdapter.getChildrenCount", "Tried to access group's "+
        groupPosition+" children which have not yet been added!");
        return 0;
    }
    else
        return listChild.get(groupPosition).size();
}

Post any further errors that might occur, as this code is not tested with your setup.

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08-15 21:02