一分钟掌握Android spinner下拉框

Android 自带的spinner下拉框控件是一个不错的系统控件。主要有两种实现方式：

1.静态的spinner

在res\values中加入一个city资源数组文件

 2 <resources>

 3

 4     <string-array name="city">

 5         <item>北京</item>

 6         <item>上海</item>

 7         <item>广州</item>

 8         <item>厦门</item>

 9     </string-array>

10

11 </resources>

设置代码

		Spinner sp = (Spinner) findViewById(R.id.spinner1);

		sp.setOnItemSelectedListener(new Spinner.OnItemSelectedListener() {

			@Override

			public void onItemSelected(AdapterView<?> arg0, View arg1,

					int arg2, long arg3) {

				Log.e("arg2",arg2);//id

			}

			@Override

			public void onNothingSelected(AdapterView<?

> arg0) {

			}

		});

		ArrayAdapter adapter =ArrayAdapter.createFromResource(this,R.array.city, android.R.layout.simple_spinner_item);

		sp.setAdapter(adapter);

		sp.setSelection(0);//默认选择第一项

2.动态的spinner

 ArrayList<String> al=new ArrayList<String>();

		al.add("北京");

		al.add("上海");

		Spinner sp = (Spinner)findViewById(R.id.spinner1);

		sp.setOnItemSelectedListener(new Spinner.OnItemSelectedListener() {

			@Override

			public void onItemSelected(AdapterView<?> arg0, View arg1,

					int arg2, long arg3) {

				Log.e("arg2",arg2);//id

			}

			@Override

			public void onNothingSelected(AdapterView<?> arg0) {

			}

		});

		ArrayAdapter<String> adapter =new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,al);//要加图片可自己定义适配器

		sp.setAdapter(adapter);

		sp.setSelection(1);//默认选择第二项

注：setAdapter()方法加入的时机必须在容器集合获取到相关数据后，否则spinner内容无法显示;

setSelection()方法必须最后运行，否则无法选择指定项;

资源文件转数组：getResources().getStringArray(R.array.x);