Spinner的setOnItemSelectedListener(

第一个颜色选择Spinner数据来源于Values文件夹内的arrays.xml文件，
<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string-array name="colors">
        <item>红色</item>
        <item>橙色</item>
        <item>黄色</item>
        <item>绿色</item>
        <item>蓝色</item>
        <item>紫色</item>
    </string-array>
</resources>
通过下面的方法从一个资源XML文件中加载数据，创建一个数组类的适配器对象，布局文件是使用系统提供的layout.simple_spinner_item，这里布局文件设置的是Spinner布局样式。
   final ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
              this, R.array.colors, android.R.layout.simple_spinner_item);
而弹出的下拉列表的样式是由Spinner的适配器的setDropDownViewResource()方法设置的。
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
第二个Spinner用于星座选择，数据是用数组存储的。这两个Spinner的setOnItemSelectedListener()方法的事件处理如下：
s1.setOnItemSelectedListener(
      new OnItemSelectedListener() {
           public void onItemSelected(
                  AdapterView<?> parent, View view, int position, long id) {
                  txt2.setText(adapter.getItem(position).toString());
            }

public void onNothingSelected(AdapterView<?> parent) {
txt2.setText("没选中的");
}
});
其中的onItemSelected(AdapterView<?> parent, View view, int position, long id)方法是选中选择项目时触发的，其中的position选择项目的位置，id是选择项目的编号。而什么都不选的方法是onNothingSelected(AdapterView<?> parent)。http://heziji0672.blog.com/
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