Question

I have asked this question before with other adapters like SimpleAdapter but the solution for the simple adapter is not working for ArrayAdapter. In a SimpleAdapter I got the screen width & height then passed that to my RelativeLayout for the data row. The effect was that only one record filling the entire screen was shown at a time. That was fine with static data but now I want to use mutable data.

In short I really don’t want to pass the height and width at all. My XML layout is using dip so the screen sizes can change all they want. What I am REALLY after is a way to control the getView call to just one record at a time.

Anyway using the workaround from SimpleAdapter I thought passing the height and width just like before would work but for some reason this time I’m getting an error I can’t figure out. Here is the code that sets the width and height:

RelativeLayout.LayoutParams szParms = new RelativeLayout.LayoutParams(mWidth, mHeight);
vw_BigRow.setLayoutParams(szParms);

The height and width are determined elsewhere and are accurate across all devices I’ve tested with.
Not really sure what else to post so just tell me and I add that code / info to the question.

E/AndroidRuntime(404): FATAL EXCEPTION: main
E/AndroidRuntime(404): java.lang.ClassCastException: android.widget.RelativeLayout$LayoutParams

Edit

As has been correctly pointed out my error occurs with a CastClassException however I am still not doing the assignment right as I continue to get the error. I have tried in the activity to set the height / width with the following:

AbsListView.LayoutParams szParms = new AbsListView.LayoutParams(mWidth, mHeight);
lstvw_LiftData.setLayoutParams(szParms);

E/AndroidRuntime(1886): FATAL EXCEPTION: main
E/AndroidRuntime(1886): java.lang.ClassCastException: android.widget.AbsListView$LayoutParams

and

ListView.LayoutParams szParms = new ListView.LayoutParams(mWidth, mHeight);
lstvw_LiftData.setLayoutParams(szParms);

E/AndroidRuntime(1886): FATAL EXCEPTION: main
E/AndroidRuntime(1886): java.lang.ClassCastException: android.widget.AbsListView$LayoutParams

the lstvw_LiftData is a valid ref and not null.

Inside the getView() override of the ArrayAdapter I also try to set the values with the same result

@Override 
public View getView(int position, View convertView, ViewGroup parent) 
{...}

The only thing I can get to work is this and then a couple, Not All, but a couple of my elements are ignoring their layout positioning and going straight to the bottom.

View vw_BigRow = convertView;
    
if (vw_BigRow == null) 
{
    LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    vw_BigRow = inflater.inflate(R.layout.liftdatalayout, null);
}
    
vw_BigRow.setMinimumHeight(mHeight);
vw_BigRow.setMinimumWidth(mWidth);

Answer 1

1.If you want call to just one record at a time, just control the getCount of the adapter you implemented to return 1.

2.The java.lang.ClassCastException: android.widget.RelativeLayout$LayoutParams exception is because the view want added to the listview should use AbsListView.LayoutParams instead of other LayoutParams such as RelativeLayout$LayoutParams.

EDIT:

See below getView code which is recommended by google.

/**
 * Make a view to hold each row.
 *
 * @see android.widget.ListAdapter#getView(int, android.view.View,
 *      android.view.ViewGroup)
 */
public View getView(int position, View convertView, ViewGroup parent) {
    // A ViewHolder keeps references to children views to avoid unneccessary calls
    // to findViewById() on each row.
    ViewHolder holder;

    // When convertView is not null, we can reuse it directly, there is no need
    // to reinflate it. We only inflate a new View when the convertView supplied
    // by ListView is null.
    if (convertView == null) {
        convertView = mInflater.inflate(R.layout.list_item_icon_text, null);

        // Creates a ViewHolder and store references to the two children views
        // we want to bind data to.
        holder = new ViewHolder();
        holder.text = (TextView) convertView.findViewById(R.id.text);
        holder.icon = (ImageView) convertView.findViewById(R.id.icon);

        convertView.setTag(holder);
    } else {
        // Get the ViewHolder back to get fast access to the TextView
        // and the ImageView.
        holder = (ViewHolder) convertView.getTag();
    }

    // Bind the data efficiently with the holder.
    holder.text.setText(DATA[position]);
    holder.icon.setImageBitmap((position & 1) == 1 ? mIcon1 : mIcon2);

    return convertView;
}

static class ViewHolder {
    TextView text;
    ImageView icon;
}