android中下拉框控件——Spinner

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android中，用spinner控件很容易实现下拉框的功能。

下面是具体实现的步骤：

在layout中添加spinner控件：

    <Spinner         android:id="@+id/SpinnerAPDU"         android:layout_width="fill_parent"        android:layout_height="wrap_content">            </Spinner>

在Activity中添加如下代码：

private static final String[] mAPDU={"0x00, 0x84, 0x00, 0x00, 0x08 ","0x00, 0xc0, 0x00, 0x00, 0x0a","..."};private Spinner spinner;private ArrayAdapter<String> adapter;private static int mApduIndex = -1;    @Override    protected void onCreate(Bundle savedInstanceState) {        // TODO Auto-generated method stub        super.onCreate(savedInstanceState);        requestWindowFeature(Window.FEATURE_NO_TITLE);          setContentView(R.layout.iccard);        mQuery = (EditText) findViewById(R.id.textViewQuery);        mRuternData = (EditText) findViewById(R.id.textViewRuternData);        spinner = (Spinner) findViewById(R.id.SpinnerAPDU);//将可选内容与ArrayAdapter连接起来adapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,mAPDU);//设置下拉列表的风格adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);//将adapter 添加到spinner中spinner.setAdapter(adapter);//添加事件Spinner事件监听  spinner.setOnItemSelectedListener(new SpinnerSelectedListener(){});//设置默认值spinner.setVisibility(View.VISIBLE);//使用数组形式操作abstract class SpinnerSelectedListener implements OnItemSelectedListener{public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,long arg3) {mApduIndex = arg2;}public void onNothingSelected(AdapterView<?> arg0) {}}