Question

I have an Activity which extends ExpandableListActivity and which contains some Parent Groups and some Child Entries…
Left of the entries inside the groups i put an icon. Whenever I open an entry it randomly takes out icons and it’s not showing them anymore… I couldn’t find a pattern there so I’m not quite sure where my mistake is (Maybe I am recycling my objects the wrong way?!)

Here is my BaseExpandableListAdapter:

@Override
    public View getChildView(int groupPosition, int childPosition,
            boolean isLastChild, View convertView, ViewGroup parent) {

        if (convertView == null) {
            LayoutInflater inflater = (LayoutInflater) myContext
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = inflater.inflate(R.layout.child_row, null);
        }

        TextView tvName = (TextView) convertView.findViewById(R.id.tvName);
        tvName .setText(arrChildelements[groupPosition][childPosition]);
        ImageView tvIcon = (ImageView) convertView.findViewById(R.id.imageViewIcon);

        switch (childPosition) {
            case 0:
                tvIcon.setImageResource(R.drawable.ic_1);
                break;
            case 1:
                tvIcon.setAlpha(0);
                break;
            case 2:
                tvIcon.setImageResource(R.drawable.ic_2);
                break;
            case 3:
                tvIcon.setImageResource(R.drawable.ic_3);
                break;
            case 4:
                tvIcon.setImageResource(R.drawable.ic_4);
                break;
            case 5:
                tvIcon.setImageResource(R.drawable.ic_5);
                break;
            case 6:
                tvIcon.setImageResource(R.drawable.ic_6);
                break;
        }

        return convertView;
    }

And here is my child_row.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="40dp"
    android:gravity="center_vertical"
    android:orientation="horizontal" >

    <ImageView
        android:id="@+id/imageViewIcon"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center_vertical"
        android:paddingLeft="40dp"
        android:src="@drawable/empty" />

    <TextView
        android:id="@+id/tvName"
        android:layout_width="wrap_content"
        android:layout_height="30dp"
        android:autoLink="all"
        android:gravity="center_vertical"
        android:paddingLeft="10dp"
        android:textSize="18sp" >
    </TextView>

</LinearLayout>

If you need any additional information and/or code, please let me know!

Thanks in advance for your help and please excuse my english…

Answer 1

it because tvIcon.setAlpha(0); and ListView optimalization …
you should set alpha to 1 in other cases (tvIcon.setAlpha(1); before switch statment)…

Edit:

or instead tvIcon.setAlpha(0); try tvIcon.setImageResource(R.drawable.empty);