在做应用时，经常要用到下拉列表选择操作，比如我们点击下拉列表选择省市区，选择性别等。我们可以用多种方法实现，比如可以用ListView显示数据，再用onItemClickListner()事件来处理选择操作。不过更好的选择是用Android自带的下拉列表控件Spinner。
--------------------------超简单布局--------------------------------------------------
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/view_city"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/hello_world" />
<Spinner
android:id="@+id/my_pinner"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</LinearLayout>
-------------------------代码实现------------------------------------
public class MainActivity extends Activity {
/**文字显示TextView*/
private TextView mTextView;
/**下拉列表Spinner */
private Spinner mSpinner;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewById();
}
/**初始化控件*/
private void findViewById() {
mTextView = (TextView) findViewById(R.id.view_city);
mSpinner = (Spinner) findViewById(R.id.my_spinner);
mSpinner.setOnItemSelectedListener(new DefultOnItemSelectedListener());
mSpinner.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_checked, getData()));
}
/**自定义选择事件类 */
class DefultOnItemSelectedListener implements Spinner.OnItemSelectedListener {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
mTextView.setText(parent.getItemAtPosition(position).toString());
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
//暂未处理
}
};
/**设置些初始数据*/
private List<String> getData() {
List<String> list = new ArrayList<String>();
for (int i = 0; i < 10; i++) {
list.add("ldm_" + i);
}
return list;
}
}