Spinner of Android Common UI

In the application, we often use the drop-down list to select the operation, such as we click the drop-down list to select the provinces and cities, choose gender and so on. We can do this in a variety of ways, such as using the ListView to display the data, and then using the Onitemclicklistner () event to handle the selection. But the better option is to use the Android-brought drop-down list control spinner.

--------------------------Ultra-Simple layout--------------------------------------------------

<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>

-------------------------Code Implementation------------------------------------

public class Mainactivity extends Activity {
/** Text Display textview*/
Private TextView Mtextview;
/** drop-down list spinner */
Private Spinner Mspinner;
public void OnCreate (Bundle savedinstancestate) {
Super.oncreate (savedinstancestate);
Setcontentview (R.layout.activity_main);
Findviewbyid ();
}
/** Initialization Control */
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 ()));
}

/** Custom Selection Event class */
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) {
Pending processing
}
};

/** set some initial data */
Private List<string> GetData () {
list<string> list = new arraylist<string> ();
for (int i = 0; i < i++) {
List.add ("ldm_" + i);
}
return list;
}
}

Spinner of Android Common UI