Java – Android spinner has a different background for each line

I know this topic has been solved many times. I have found several such problems, but I can't meet my needs I want a list of colors in the spinner I did, but my spinner was empty

In my oncreate():

spinner = (Spinner) findViewById(R.id.spinner1); 
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
    this,R.array.androidcolors,android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(
    android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);

In the folder value, I created a file colors xml：

<resources>

<item name="blue" type="color">#FF33B5E5</item>
<item name="purple" type="color">#FFAA66CC</item>
<item name="green" type="color">#FF99CC00</item>
<item name="orange" type="color">#FFFFBB33</item>
<item name="red" type="color">#FFFF4444</item>
<item name="darkblue" type="color">#FF0099CC</item>
<item name="darkpurple" type="color">#FF9933CC</item>
<item name="darkgreen" type="color">#FF669900</item>
<item name="darkorange" type="color">#FFFF8800</item>
<item name="darkred" type="color">#FFCC0000</item>

<integer-array name="androidcolors">
    <item>@color/blue</item>
    <item>@color/purple</item>
    <item>@color/green</item>
    <item>@color/orange</item>
    <item>@color/red</item>
    <item>@color/darkblue</item>
    <item>@color/darkpurple</item>
    <item>@color/darkgreen</item>
    <item>@color/darkorange</item>
    <item>@color/darkred</item>
</integer-array>

</resources>

Solution

It's simple. You have to do it

1. Write your own custom adapter for the spinner. How do you do this

class SpinnerAdapter extends BaseAdapter
{
    ArrayList<Integer> colors;
    Context context;

    public SpinnerAdapter(Context context) 
    {
        this.context=context;
        colors=new ArrayList<Integer>();
        int retrieve []=context.getResources().getIntArray(R.array.androidColors);
        for(int re:retrieve)
        {
            colors.add(re);
        }
    }
    @Override
    public int getCount() 
    {
        return colors.size();
    }
    @Override
    public Object getItem(int arg0) 
    {
            return colors.get(arg0);
    }
    @Override
    public long getItemId(int arg0) 
    {
        return arg0;
    }
    @Override
    public View getView(int pos,View view,ViewGroup parent) 
    {
        LayoutInflater inflater=LayoutInflater.from(context);
        view=inflater.inflate(android.R.layout.simple_spinner_dropdown_item,null);
        TextView txv=(TextView)view.findViewById(android.R.id.text1);
        txv.setBackgroundColor(colors.get(pos));
        txv.setTextSize(20f);
        txv.setText("Text  "+pos);
        return view;
    }

}

2. Set the adapter like this

spnColors=(Spinner)findViewById(R.id.spnColor);
spnColors.setAdapter(new SpinnerAdapter(this));

The end result is

Please accept the answer if it helps!