Android下拉框如何实现？

Android下拉框

Activity_main.xml

MainActivity.java

package pw.gutao.android_08_0628;

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.AutoCompleteTextView;
import android.widget.MultiAutoCompleteTextView;
import android.widget.Spinner;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    private AutoCompleteTextView autoCompleteTextView;
    private MultiAutoCompleteTextView multiAutoCompleteTextView;
    private Spinner spinner;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

              //获取下拉列表
        spinner = (Spinner) findViewById(R.id.s_main_1);


        //定义数组，保存省份
        final String[] provinces = {"湖南","湖北","河南","河北","山东","山西"};
        //创建适配器
        ArrayAdapter adapters = new ArrayAdapter(this,android.R.layout.simple_list_item_1,provinces);
        //设置适配器
        spinner.setAdapter(adapters);
        //获取当前选中的选项
        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView parent, View view, int position, long id) {
                Toast.makeText(MainActivity.this,provinces[position]+"省",Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onNothingSelected(AdapterView parent) {

            }
        });
    }
}