Android学习笔记之——Spinner

package com.example.zyallz.spinnerdemo;

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

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

public class MainActivity extends AppCompatActivity implements AdapterView.OnItemSelectedListener {

private Spinner spinner;
private List<String > list;
private TextView textView;
private ArrayAdapter<String > adapter;

@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<>();
list.add("北京");
list.add("上海");
list.add("深圳");
list.add("广州");

adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, list);
spinner.setAdapter(adapter);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setOnItemSelectedListener(this);

}

@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
textView.setText("您选择了：" +adapter.getItem(position));
}

@Override
public void onNothingSelected(AdapterView<?> parent) {

}
}