MainActivity.java
package com.cfsuman.androidtutorials;
import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;
import androidx.annotation.NonNull;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Get the widgets reference from XML layout
Spinner spinner = findViewById(R.id.spinner);
// Initializing a String Array
String[] plants = new String[]{
"Laceflower",
"California sycamore",
"Mountain mahogany",
"Butterfly weed",
"Carrot weed"
};
// Convert array to a list
List<String> plantsList = new ArrayList<>
(Arrays.asList(plants));
// Initializing an ArrayAdapter
ArrayAdapter<String> spinnerArrayAdapter
= new ArrayAdapter<String>(
this,
android.R.layout.simple_dropdown_item_1line,
plantsList
){
public View getDropDownView(
int position, View convertView,
@NonNull ViewGroup parent) {
View view = super.getDropDownView(
position, convertView, parent);
TextView textView = (TextView) view;
if(position%2 == 1) {
// Set the item text color
textView.setTextColor(
Color.parseColor("#0018A8"));
// Set the item background color
textView.setBackgroundColor(
Color.parseColor("#FEFEFA"));
}
else {
// Alternate item text color
textView.setTextColor(
Color.parseColor("#A2006D"));
// Alternate item background color
textView.setBackgroundColor(
Color.parseColor("#FFFAF0"));
}
return view;
}
};
// Set the drop down view resource
spinnerArrayAdapter.setDropDownViewResource(
android.R.layout.simple_dropdown_item_1line
);
// Finally, data bind the spinner object with adapter
spinner.setAdapter(spinnerArrayAdapter);
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#DCDCDC"
android:padding="64dp">
<Spinner
android:id="@+id/spinner"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

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