Android 下拉列表 Spinner
16lz
2021-01-23
为了方便用户，不让用户填写这些信息，下拉列表就可以派上用场了。在Android中开发下拉列表步骤：
1、在布局文件中定义Spinner组件
2、将可选内容通过ArrayAdapter和下拉列表框连接起来
3、获得用户选择项，设定相应的监听信息
不多说，直接上代码，如下：
public class SpinnerActivity extends Activity {private static final String[] MCOUNTRY = {"中国","美国","日本","印度","英国"};private TextView mTextView;private Spinner mSpinner;private ArrayAdapter<String> mAdapter; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mTextView = (TextView)findViewById(R.id.tv); mSpinner = (Spinner)findViewById(R.id.sp); mAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,MCOUNTRY); mSpinner.setAdapter(mAdapter); mSpinner.setOnItemSelectedListener(new OnItemSelectedListener() {public void onItemSelected(AdapterView<?> arg0, View arg1,int arg2, long arg3) {// TODO Auto-generated method stubmTextView.setText("你的国家是： " + MCOUNTRY[arg2]);arg0.setVisibility(View.VISIBLE);}public void onNothingSelected(AdapterView<?> arg0) {// TODO Auto-generated method stub}}); }} 其中布局代码如下：
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <TextView android:id="@+id/tv" android:layout_width="fill_parent" android:layout_height="wrap_content" /> <Spinner android:id="@+id/sp" android:layout_width="wrap_content" android:layout_height="wrap_content" /></LinearLayout>
完成后的图片如下所示：
