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：//数据可以放在res\values中添加一个city资源数组文件使用ArrayAdapter  2.数据放入容器集合自定义Adapter 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() {@Overridepublic void onItemSelected(AdapterView<?> arg0, View arg1,int arg2, long arg3) {Log.e("arg2",arg2);//position id}@Overridepublic void onNothingSelected(AdapterView<?> arg0) {}});ArrayAdapter adapter =ArrayAdapter.createFromResource(this,R.array.city,android.R.layout.simple_spinner_dropdown_item);sp.setAdapter(adapter);sp.setSelection(0);//默认选择第一项/////////////////////////////////////////////////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() {@Overridepublic void onItemSelected(AdapterView<?> arg0, View arg1,int arg2, long arg3) {Log.e("arg2",arg2);//position id}@Overridepublic void onNothingSelected(AdapterView<?> arg0) {}});ArrayAdapter<String> adapter =new ArrayAdapter<String>(this,android.R.layout.simple_spinner_dropdown_item,al);//加图片可自定义适配器sp.setAdapter(adapter);sp.setSelection(1);//默认选择第二项//注：setAdapter()方法添加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;//spinner.setPrompt()设置标题 布局xml需要为 style="@android:style/Widget.Spinner" //setSelection()方法在setAdapter后执行，否则无法选择指定项;初始化时不选中setSelection(0,true);//资源文件转数组：getResources().getStringArray(R.array.x);