SpinnerAdapter.java

package com.uservoice.uservoicesdk.ui;

import android.app.Activity;
import android.graphics.Color;
import android.util.TypedValue;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import com.uservoice.uservoicesdk.R;

import java.util.List;

public class SpinnerAdapter<T> extends BaseAdapter {

    private static int NONE = 0;
    private static int OBJECT = 1;

    private final List<T> objects;
    private LayoutInflater inflater;
    private int color;

    public SpinnerAdapter(Activity context, List<T> objects) {
        this.objects = objects;
        inflater = context.getLayoutInflater();
        TypedValue tv = new TypedValue();
        context.getTheme().resolveAttribute(android.R.attr.textColorPrimary, tv, true);
        color = context.getResources().getColor(tv.resourceId);
    }

    @Override
    public int getCount() {
        return objects.size() + 1;
    }

    @Override
    public Object getItem(int position) {
        if (position == 0)
            return null;
        return objects.get(position - 1);
    }

    @Override
    public long getItemId(int position) {
        return 0;
    }

    @Override
    public int getItemViewType(int position) {
        return position == 0 ? NONE : OBJECT;
    }

    @Override
    public View getDropDownView(int position, View convertView, ViewGroup parent) {
        View view = convertView;
        int type = getItemViewType(position);
        if (view == null) {
            view = inflater.inflate(android.R.layout.simple_list_item_1, null);
        }

        TextView textView = (TextView) view;
        if (type == OBJECT) {
            textView.setTextColor(color);
            textView.setText(getItem(position).toString());
        } else {
            textView.setTextColor(Color.GRAY);
            textView.setText(R.string.uv_select_none);
        }
        return view;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View view = convertView;
        int type = getItemViewType(position);
        if (view == null) {
            view = inflater.inflate(android.R.layout.simple_list_item_1, null);
        }

        TextView textView = (TextView) view;
        if (type == OBJECT) {
            textView.setTextColor(color);
            textView.setText(getItem(position).toString());
        } else {
            textView.setTextColor(color);
            textView.setText(R.string.uv_select_one);
        }
        return view;
    }

}