レイアウトを動的に追加したい｡

レイアウトを動的に追加するコードを書いたのですが､うまく行かず表示されません｡
以下のthree_grid_row.xmlにgrid_item.xmlを3つ水平に並べたものを複数作成し､ルートビューであるfragment_video_info.xmlのLinearLayoutであるsuggestion_video_listに追加します｡
実行してみるとエラーは出ないのですがsuggest_video_listが表示されません｡

fragment_video_info.xmlの一部:

 <LinearLayout
        android:id="@+id/suggestion_video_list"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">
 </LinearLayout>

three_grid_row.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent" android:layout_height="wrap_content"
    android:orientation="horizontal">

</LinearLayout>

grid_item.xml:

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">
    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical">
        <RelativeLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content">
            <ImageView
                android:id="@+id/iv_thumbnail"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" />
            <TextView
                android:id="@+id/suggest_duration"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="65dp"
                android:layout_marginRight="4dp"
                android:background="@drawable/border"
                android:textColor="#FFFFFF"/>
        </RelativeLayout>
        <RelativeLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content">
            <TextView
                android:id="@+id/suggest_video_name"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:ellipsize="end"
                android:maxLines="2"
                android:textAppearance="?android:attr/textAppearanceMediumInverse"/>
            <TextView
                android:id="@+id/suggest_ch_name"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@+id/suggest_video_name"
                android:textAppearance="?android:attr/textAppearanceSmall"/>
            <TextView
                android:id="@+id/suggest_video_view"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@+id/suggest_ch_name"
                android:textAppearance="?android:attr/textAppearanceSmall"/>
        </RelativeLayout>

    </LinearLayout>
</FrameLayout>

処理部:

if (!relatedVideoList.isEmpty()) {
            //layoutInflaterを取得
            LayoutInflater inflater = (LayoutInflater) getActivity().getApplicationContext()
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

            //LinearLayoutを入れる配列を作る
            LinearLayout[] gridRowList = new LinearLayout[7];
            for (int i = 0; i < 3; i++) {
                gridRowList[i] = (LinearLayout) inflater.inflate(R.layout.three_grid_row, null);
            }
            for (int i = 3; i < 7; i++) {
                gridRowList[i] = (LinearLayout) inflater.inflate(R.layout.three_grid_row, null);
                gridRowList[i].setVisibility(View.GONE);
            }

            //LinearLayoutに追加
            int count = 0;
            for (VideoItems item : relatedVideoList) {
                FrameLayout gridItem = null;
                if (count < 3) {
                    gridItem = (FrameLayout) inflater.inflate(R.layout.grid_item, gridRowList[0], false);
                } else if (count >= 3 && count < 6) {
                    gridItem = (FrameLayout) inflater.inflate(R.layout.grid_item, gridRowList[1], false);
                } else if (count >= 6 && count < 9) {
                    gridItem = (FrameLayout) inflater.inflate(R.layout.grid_item, gridRowList[2], false);
                } else if (count >= 9 && count < 12) {
                    gridItem = (FrameLayout) inflater.inflate(R.layout.grid_item, gridRowList[3], false);
                } else if (count >= 12 && count < 15) {
                    gridItem = (FrameLayout) inflater.inflate(R.layout.grid_item, gridRowList[4], false);
                } else if (count >= 15 && count < 18) {
                    gridItem = (FrameLayout) inflater.inflate(R.layout.grid_item, gridRowList[5], false);
                } else if (count >= 18 && count < 21) {
                    gridItem = (FrameLayout) inflater.inflate(R.layout.grid_item, gridRowList[6], false);
                }

                //Viewをセット
                if (gridItem != null) {
                    SuggestViewHolder holder = new SuggestViewHolder();
                    setGridItemView(gridItem, holder);
                    setGridItemContents(holder, item);
                }
                count++;
            }

            //LinearLayoutにViewをセット
            LinearLayout suggestVideoContainer = (LinearLayout) view.findViewById(R.id.suggestion_video_list);
            for (LinearLayout item : gridRowList) {
                suggestVideoContainer.addView(item);
            }

            //関連動画を出すボタンの有無をセットする
            if (gridRowList.length < 4 ) {
                LinearLayout suggestButton = (LinearLayout)view.findViewById(R.id.suggest_exp_button);
                suggestButton.setVisibility(View.GONE);
            }
        }

setGridItemView:

 private void setGridItemView(FrameLayout gridItem, SuggestViewHolder holder){
    holder.suggestThumbnail = (ImageView)gridItem.findViewById(R.id.iv_thumbnail);
    holder.suggestDuration = (TextView)gridItem.findViewById(R.id.suggest_duration);
    holder.suggestVideoName = (TextView)gridItem.findViewById(R.id.suggest_video_name);
    holder.suggestChannelName = (TextView)gridItem.findViewById(R.id.suggest_ch_name);
    holder.suggestViewCount = (TextView)gridItem.findViewById(R.id.suggest_video_view);
}

setGridItemContents:

private void setGridItemContents(SuggestViewHolder holder, VideoItems videoItems){
    Picasso.with(getActivity()).load(videoItems.snippet.thumbnails.default1.url).into(holder.suggestThumbnail);
    holder.suggestChannelName.setText(videoItems.snippet.channelTitle);
    holder.suggestDuration.setText(durationConverter(videoItems.contentDetails.duration));
    holder.suggestVideoName.setText(videoItems.snippet.title);
    holder.suggestViewCount.setText(numberConverter(videoItems.statistics.viewCount, 0) + " " + getString(R.string.views));
}

なにか､間違えているところがありましたら教えて下さい｡よろしくお願いします｡