Spinner的使用（android:entries指定列表项）

系统管理员 2021-05-03 09:45 581阅读 0赞

列表添加列表项有两种方法:，下面例子：  
\- spinner1通过android:entries指定了列表的项数组  
\- spinner2通过ArrayAdapter适配器使用数组来确定列表项

activity\_main.xml

string.xml

<?xml version="1.0" encoding="utf-8"?>
    <resources>
    
        <string name="app_name">SpinnerDemo</string>
        <string name="action_settings">Settings</string>
        <string name="spinnerTitle">请选择</string>
        <string-array name="books">
            <item >Java基础教程</item>
            <item >web开发项目实训</item>
            <item >Android基础教程</item>
            <item >计算机网络</item>
        </string-array>
    
    </resources>

MainActivity.java

package com.example.spinnerdemo;
    
    public class MainActivity extends ActionBarActivity { 
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
            Spinner sp2 = (Spinner)findViewById(R.id.spinner2);
            final TextView tv = (TextView)findViewById(R.id.textView1);
            final String[] citys = new String[]{
       "北京","上海","广州"};
            //创建适配器，并设置给spinner2
            ArrayAdapter aa = new ArrayAdapter(this,android.R.layout.simple_list_item_1,citys);
            sp2.setAdapter(aa);
            //添加监听器，监听点击事件
            sp2.setOnItemSelectedListener(new OnItemSelectedListener(){
                @Override
                public void onItemSelected(AdapterView<?> parent, View view,
                        int position, long id) {
                    tv.setText("选择"+citys[position]);
                }
    
                @Override
                public void onNothingSelected(AdapterView<?> parent) {
                }
    
            });
        }
    }