任何人都可以請解釋me實現微調的onNothingSelected()的利用實施例何時執行onNothingSelected方法?
public class SpinnerActivity extends Activity implements OnItemSelectedListener {
...
public void onItemSelected(AdapterView<?> parent, View view,
int pos, long id) {
Toast.makeText(this,"Selected Item is -"+ (TextView)view.getText().toString(),Toast.LENGTH_SHORT);
}
public void onNothingSelected(AdapterView<?> parent) {
// Another interface callback
Toast.makeText(this,"nothing is selected",Toast.LENGTH_SHORT);
}
}
來自android文檔 「當選擇從該視圖中消失時要調用的回調方法。例如,當激活觸摸或適配器變空時,選擇可能會消失。 –