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:andro
    xmlns:tools="/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="">




    <!-- 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 ;

import .;
import ;
import ;
import ;
import ;
import ;
import ;

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

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

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

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

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

            }
        });

    }
}

效果：