Difference Between Getview & Getdropdownview in Spinneradapter

Difference between getView & getDropDownView in SpinnerAdapter

If we look at the following code, we have name and value array in getView and getDropDownView.

private void initView() {
    SpinnerDropDownAdapter sddadapter = new SpinnerDropDownAdapter(this);
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
            android.R.layout.simple_spinner_item, sddadapter.name);

    Spinner getViewSP = (Spinner) findViewById(R.id.getview_sp);
    getViewSP.setAdapter(adapter);

    Spinner getViewWDropDownSP = (Spinner) findViewById(R.id.getview_w_drop_down_sp);
    getViewWDropDownSP.setAdapter(sddadapter);
}

static class SpinnerDropDownAdapter extends BaseAdapter implements
        SpinnerAdapter {
    Context context;

    SpinnerDropDownAdapter(Context ctx) {
        context = ctx;
    }

    String[] name = { " One", " Two", " Three", " Four", " Five", " Six",
            " Seven", " Eight" };
    String[] value = { " 1", " 2", " 3", " 4", " 5", " 6", " 7", " 8" };

    @Override
    public int getCount() {
        return name.length;
    }

    @Override
    public String getItem(int pos) {
        // TODO Auto-generated method stub
        return name[pos];
    }

    @Override
    public long getItemId(int arg0) {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        TextView text = new TextView(context);
        text.setTextColor(Color.BLACK);
        text.setText(name[position]);
        return text;
    }

    @Override
    public View getDropDownView(int position, View convertView,
            ViewGroup parent) {
        TextView text = new TextView(context);
        text.setTextColor(Color.BLACK);
        text.setText(value[position]);
        return text;
    }
}

If getDropDownView method is not implemented, the drop down pop up will get the view from getView. Thus, it will only show name.

When both getView and getDropDownView is implemented, the former getting name and the latter getting value, the spinner at rest will get name from getview and the drop down pop up will get value.

Same code on getView and getDropDownView on ANDROID spinner

call getView from your getDropDownView and return result

@Override
public View getDropDownView(int position, View convertView, ViewGroup parent) {
    return getView(position, convertView, parent);
}

Override of getDropDownView in ArrayAdapter in order to change color of particular row in dropdown also change color of another rows

I found the problem. Here is the correct version.

final ArrayAdapter<CharSequence> sprache_ratoromanisch_adapter =
            new ArrayAdapter<CharSequence>(
                    getContext(),
                    android.R.layout.simple_spinner_item,
                    list_sprache_ratoromanisch) {

                @Override
                public View getDropDownView (int position, View convertView, ViewGroup parent){
                    View row = null;

                    if(position == 0) {
                        row = super.getDropDownView(position, convertView, parent);
                        row.setBackgroundColor(Color.LTGRAY);
                     }
                    else {
                        row = super.getDropDownView(position, null, parent);
                    }
                    return row;
                }
            };

Android Spinner with different layouts for drop down state and closed state?

You have to create a custom Adapter class for the Spinner and overwrite the two methods getView() for the normal closed view and getDropDownView() for the drop down list view. Both methods must return a View object for a single element.

Have a look at this tutorial it might help you getting started.

How to correctly overwrite methods of SpinnerAdapter

Thanks for the answers, but nevertheless I want to share with you the solution I used after searching more references:

Instead that just implementing SpinnerAdapter in my Adapter, I extend BaseAdapter and implement SpinnerAdapter:

private class ListAdapter extends BaseAdapter implements SpinnerAdapter {

        @Override
        public int getCount() {
            return allLists.size();
        }

        @Override
        public Object getItem(int position) {
            return allLists.get(position);
        }

        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        public View getView(int position, View view, ViewGroup parent) {
            TextView text = new TextView(lexs);
            text.setText(allLists.get(position).getName());
            return text;
        }

    }

Then it isn't necessary to override all this strange methods such as isEmpty(), registerDataObserver(), etc.

And if necessry one can still override getDropDownView(...)

Additionally using this solution, one can call adapter.notifyDatasetChanged() which isn't as easy if the adapter just implements SpinnerAdapter and doesn't extend BaseAdapter.

Spinner usage on Android

You need to set getView() and getDropDownView() in your adapter.

getView() will set the layout for your picture 1, and getDropDownView() sets the -as the name says- drop down view for your picture 4.

Check this well written answer

Android data binding spinner adapter

It's actually not a databinding-issue. It's because TextView arent wrapped by default and also doesnt have elipses if you dont set them.

You may want to try either to create your own Layout which gets inflated, or you may use

textView.setSingleLine(false)
textView.setMaxLines(2)

If this doesnt work you need to overwrite getDropDownView

@Override
public View getDropDownView(final int position, View convertView, ViewGroup parent) {
    if (convertView == null) {
        convertView = new TextView(_context);
    }

    TextView item = (TextView) convertView;
    item.setText(yourItems.getItem(position));
    final TextView finalItem = item;
    item.post(new Runnable() {
        @Override
        public void run() {
            finalItem.setSingleLine(false);
        }
    });
    return item;
}

Easiest solution is just switch your Spinner using dialog design by putting this into your xml.

 <Spinner android:spinnerMode="dialog" />

---

Related Topics