androidstudio下拉菜单spinner用法

androidstudio下拉菜单spinner用法

直接上代码
布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.admin.myspinner.MainActivity">




    <!-- 定义下拉菜单-->
    <Spinner
        android:id = "@+id/Spinner_id"
        android:layout_width = "wrap_content"
        android:layout_height ="wrap_content" >
    </Spinner >

</LinearLayout>

Java

package com.example.admin.myspinner;

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.Spinner;
import android.widget.TextView;

import java.util.ArrayList;
//android下拉菜单spinner的使用方法
public class MainActivity extends AppCompatActivity {

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

        Spinner mSpinner = (Spinner)findViewById(R.id.Spinner_id);
        ArrayList<String> list = new ArrayList<String>();
        list.add("aaa");
        list.add("bbb");
        list.add("ccc");
        list.add("ddd");
        list.add("eee");
        list.add("fff");

        //为下拉列表定义一个适配器
        final ArrayAdapter<String> ad = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item, list);
        //设置下拉菜单样式。
        ad.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
       //添加数据
        mSpinner.setAdapter(ad);
        //点击响应事件
        mSpinner.setOnItemSelectedListener(new Spinner.OnItemSelectedListener(){
            public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) {

            }
            public void onNothingSelected(AdapterView<?> arg0) {

            }
        });

    }
}

效果：