Expandable list view child not show the all items of grid view

[AC Question]

CHILD ACTIVITY :`

<GridView
android:id="@+id/twoflagsview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:columnWidth="100dp"
android:drawSelectorOnTop="true"
android:gravity="center"
android:numColumns="3"

android:stretchMode="columnWidth"
android:verticalSpacing="0dp"
android:focusable="true"
android:clickable="true">
</GridView>
Expandable List view adapter :`

public class Myexpandablelistadapter extends BaseExpandableListAdapter
{
Context context;
List<String> langs;
Map<String, List<String>> topics;
GridView one_flag_gridview;

One_flag_gridadapter one_flag_griddapter;
public int[] mBackgroundResources ={

R.drawable.america_flag,
R.drawable.argentina_flag,
R.drawable.armenia_flag,
R.drawable.iplchenai_super_kings,
R.drawable.ipldehli_devils,
R.drawable.iplkings_xi_punjab,
};

Myexpandablelistadapter( Context context,List<String> langs, Map<String, List<String>> topics)
{
this.context=context;
this.langs=langs;
this.topics=topics;
}

@override
public int getGroupCount() {
return langs.size();
}

@override
public int getChildrenCount(int i) {
return topics.get(langs.get(i)).size();
}

@override
public Object getGroup(int i) {
return langs.get(i);
}

@override
public Object getChild(int i, int i1) {
return topics.get(langs.get(i)).get(i1);
}

@override
public long getGroupId(int i) {
return i;
}

@override
public long getChildId(int i, int i1) {
return i1;
}

@override
public boolean hasStableIds() {
return true;
}

@override
public View getGroupView(int i, boolean b, View view, ViewGroup viewGroup) {

String langs=(String)getGroup(i);
if(view==null)
{
LayoutInflater layoutInflater=(LayoutInflater) context.getSystemService(context.LAYOUT_INFLATER_SERVICE);
view=layoutInflater.inflate(R.layout.list_parent,null);
}
TextView textView=(TextView)view.findViewById(R.id.parent_litview);
textView.setText(langs);

return view;
}

@override
public View getChildView(int i, int i1, boolean b, View view, ViewGroup viewGroup) {
ViewGroup item = getViewGroupChild(view, viewGroup);

one_flag_gridview = (GridView) item.findViewById(R.id.twoflagsview);

one_flag_griddapter = new One_flag_gridadapter(context, R.layout.itemlist, getData1(),1);
one_flag_gridview.setAdapter(one_flag_griddapter);

return item;
}

@override
public boolean isChildSelectable(int i, int i1) {
return true;
}

private ArrayList<ImageItem> getData1() {
final ArrayList<ImageItem> imageItems = new ArrayList<>();

for (int i = 0; i < mBackgroundResources.length; i++) {

imageItems.add(new ImageItem(mBackgroundResources));
}
return imageItems;
}

private ViewGroup getViewGroupChild(View convertView, ViewGroup parent)
{
// The parent will be our ListView from the ListActivity
if (convertView instanceof ViewGroup)
{
return (ViewGroup) convertView;
}
Context context = parent.getContext();
LayoutInflater inflater = LayoutInflater.from(context);
ViewGroup item = (ViewGroup) inflater.inflate(R.layout.list_childe, null);
return item;
}

}
Grid view adapter here:

public class One_flag_gridadapter extends ArrayAdapter { private Context context;
private int layoutResourceId;
private ArrayList data = new ArrayList();
public int[] mBackgroundResources ={

R.drawable.america_flag,
R.drawable.argentina_flag,
R.drawable.armenia_flag,
R.drawable.iplchenai_super_kings,
R.drawable.ipldehli_devils,
R.drawable.iplkings_xi_punjab,
};

InputStream is;
int i11;

public One_flag_gridadapter(Context context, int layoutResourceId, ArrayList data,int i) {
super(context, layoutResourceId, data);
this.layoutResourceId = layoutResourceId;
this.context = context;
i11=i;

}

@override
public int getCount() {
return mBackgroundResources.length;
}

@override
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
ViewHolder holder = null;

if (row == null) {
LayoutInflater inflater = ((Activity) context).getLayoutInflater();
row = inflater.inflate(layoutResourceId, parent, false);
holder = new ViewHolder();

holder.image = (ImageView) row.findViewById(R.id.image);

row.setTag(holder);
} else {
holder = (ViewHolder) row.getTag();
}

is = context.getResources().openRawResource(mBackgroundResources[position]);

Bitmap mThumbnail = scaleBitmap(BitmapFactory.decodeStream(is));
holder.image.setImageBitmap(mThumbnail);

return row;
}

static class ViewHolder {
ImageView image;
TextView text;
}

private static Bitmap scaleBitmap2(Bitmap source) {
int maxSize = source.getWidth() > source.getHeight() ? source.getWidth() : source.getHeight();
return Bitmap.createScaledBitmap(source, source.getWidth() * 120 / maxSize, source
.getHeight() * 115 / maxSize, true);
}

private static Bitmap scaleBitmap(Bitmap source) {
int maxSize = source.getWidth() > source.getHeight() ? source.getWidth() : source.getHeight();
return Bitmap.createScaledBitmap(source, source.getWidth() * 120 / maxSize, source
.getHeight() * 96 / maxSize, true);
}
}
can anyone help ?