android中下拉框控件——Spinner
16lz
2021-01-26
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) {}}
更多相关文章
- ListView 表格动态设置控件宽度
- Android重写ViewGroup实现卡片布局(三)
- Android:如何将位置信息模式默认设置为高精确度
- android:transcriptMode用法
- Android(4.Activity的基本控件)
- AutoCompleteTextView 无限制输入字符及获得焦点时显示
- Android(安卓)studio中给Button添加点击事件的4种方法
- Android通过泛型来简化findViewById
- Android(安卓)控件之ImageSwitcher图片切换器