为什么我的动态创建的图像按钮不会显示在片段中？

Question

我有一个小问题。我动态创建了我的TableLayout，但它不会显示出来。

这是我的片段XML文件：

<?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="match_parent"
android:orientation="vertical" >

<Spinner
    android:id="@+id/spinner1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />

<TableLayout
    android:id="@+id/resourcesAvailableTable"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@drawable/back" >

</TableLayout>

当微调器被更改时，它会调用

onItemSelected(AdapterView<?> parent, View view, int position, long id)

这就是我相应填写TableLayout的地方。这是我填写的方式。

public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
    quickVesselRef = optimizer.Reference.vesselAlloys;
    //I destroy the buttons and TableRows that were displayed previously
    if (oreButtons != null){
        availableRes.removeAllViews();
    }
    int[] imageRef = quickVesselRef[position].getCombinedOreResVessel();
    oreButtons = new ImageButton[imageRef.length];

    //create rows
    oreRows = new TableRow[(int)  Math.ceil(oreButtons.length /((screenWidth / (double)(buttonSize + padding))))];
    for(int i = 0; i < oreRows.length; i++){
        oreRows[i] = new TableRow(getActivity());
        availableRes.addView(oreRows[i]);
    }

    //create j buttons per i rows
    int buttonsPerRow = screenWidth / (buttonSize + padding);
    for (int i = 0; i < oreRows.length; i++){
        for (int j = 0; j < buttonsPerRow; j++){
            if (i * buttonsPerRow + j >= imageRef.length)
                break;
            ImageButton button = new ImageButton(getActivity());
            oreButtons[i * buttonsPerRow + j] = button;
            button.setScaleType(ScaleType.FIT_CENTER);
            button.setLayoutParams(new LayoutParams(buttonSize, buttonSize));
            button.setImageResource(imageRef[i * buttonsPerRow + j]);
            oreRows[i].addView(button);
        }
    }
}

我的TableLayout被调用：

availableRes

此代码不会崩溃，但它不显示我创建的TableLayout，我不知道为什么。