<Spinner

         android:layout_width="match_parent"

         android:layout_height="wrap_content"

         android:id="@+id/spinner">

     </Spinner>

     <TextView

         android:layout_width="wrap_content"

         android:layout_height="wrap_content"

         android:text="苏州"

         android:textSize="20sp"

         android:id="@+id/textview"

         android:layout_below="@+id/spinner"

         android:layout_centerHorizontal="true"

         android:layout_marginTop="155dp" />

 package com.example.administrator.testmyadapter;

 import android.support.v7.app.AppCompatActivity;

 import android.os.Bundle;

 import android.view.LayoutInflater;

 import android.view.View;

 import android.view.ViewGroup;

 import android.widget.AdapterView;

 import android.widget.ArrayAdapter;

 import android.widget.BaseAdapter;

 import android.widget.ListView;

 import android.widget.Spinner;

 import android.widget.TextView;

 import java.util.ArrayList;

 import java.util.List;

 public class MainActivity extends AppCompatActivity {

     private Spinner spinner;

     private List<String> list;

     private ArrayAdapter<String> myAdapter;

     private TextView textView;

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_main);

         spinner = (Spinner) findViewById(R.id.spinner);

         textView = (TextView) findViewById(R.id.textview);

         list = new ArrayList<String>();

         list.add("苏州");

         list.add("南京");

         list.add("广州");

         list.add("南昌");

         list.add("深圳");

         list.add("无锡");

         list.add("上海");

         list.add("天津");

         list.add("重庆");

         list.add("成都");

         list.add("宁波");

         spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

             @Override

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

                 textView.setText(list.get(position));

             }

             @Override

             public void onNothingSelected(AdapterView<?> parent) {

             }

         });

         myAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, list);

         spinner.setAdapter(myAdapter);

     }

 }