How to set default value to spinner dropdown in Android?

 In Android, if you want to set a default value for a `Spinner` dropdown, you can achieve this by adding the default value to the adapter and selecting it programmatically. Here's an example:

import android.os.Bundle;

import android.view.View;

import android.widget.AdapterView;

import android.widget.ArrayAdapter;

import android.widget.Spinner;

import androidx.appcompat.app.AppCompatActivity;

import java.util.ArrayList;

import java.util.List;

public class MainActivity extends AppCompatActivity {

    private Spinner spinner;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        spinner = findViewById(R.id.spinner);

        // Create a list of items for the spinner

        List<String> items = new ArrayList<>();

        items.add("Default Value"); // Add your default value here

        items.add("Item 1");

        items.add("Item 2");

        items.add("Item 3");

        // Create an ArrayAdapter using the string array and a default spinner layout

        ArrayAdapter<String> adapter = new ArrayAdapter<>(this, android.R.layout.simple_spinner_item, items);

        // Specify the layout to use when the list of choices appears

        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

        // Apply the adapter to the spinner

        spinner.setAdapter(adapter);

        // Set the default value as the selected item

        spinner.setSelection(0); // 0 is the index of the default value

        // Set a listener to handle spinner item selection events

        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

            @Override

            public void onItemSelected(AdapterView<?> parentView, View selectedItemView, int position, long id) {

                // Handle the selected item

                String selectedValue = (String) parentView.getItemAtPosition(position);

                // Do something with the selected value

            }

            @Override

            public void onNothingSelected(AdapterView<?> parentView) {

                // Do nothing here

            }

        });

    }

}

In this example, "Default Value" is added to the list of items, and `spinner.setSelection(0);` is used to set it as the default selected item. Adjust the code based on your specific use case and UI elements.