MainActivity.java

package com.example.bestever.challenge3;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity implements AdapterView.OnItemSelectedListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        final Spinner spinner = (Spinner) findViewById(R.id.spinner);
        final TextView textView = (TextView) findViewById(R.id.txt);

        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.names, android.R.layout.simple_spinner_item);
        adapter.setDropDownViewResource(R.layout.support_simple_spinner_dropdown_item);
        spinner.setAdapter(adapter);
        spinner.setOnItemSelectedListener(this);


         Button button = (Button) findViewById(R.id.btn);
        button.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {

                String item = spinner.getSelectedItem().toString();
                textView.setText(item);

            }
        });

    }


    public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {

        parent.getItemAtPosition(pos);
    }

    public void onNothingSelected(AdapterView<?> parent) {

    }


}