是否可以知道Spinner是打开还是关闭？如果有一些用于Spinners的onOpenListener，那就更好了。
我试过像这样使用OnItemSelectedListener:
spinnerType.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
executeSomething();
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
Log.d("nothing" , "selected");
}
});
我知道，如果选择了某些内容(在executeSomething()中)，则窗口将关闭。但是，如果我在对话框外部单击也不会收到通知，该对话框也会关闭微调器
最佳答案
监视这些事件的另一种方法是扩展Spinner类并使用其方法之一(performClick()将触发其对话框/弹出窗口)，然后监视包含此自定义Spinner的窗口的焦点。这应该为您提供所有可能的结束可能性所需的关闭事件(对于对话框或下拉模式)。
自定义Spinner类:
public class CustomSpinner extends Spinner {
/**
* An interface which a client of this Spinner could use to receive
* open/closed events for this Spinner.
*/
public interface OnSpinnerEventsListener {
/**
* Callback triggered when the spinner was opened.
*/
void onSpinnerOpened(Spinner spinner);
/**
* Callback triggered when the spinner was closed.
*/
void onSpinnerClosed(Spinner spinner);
}
private OnSpinnerEventsListener mListener;
private boolean mOpenInitiated = false;
// implement the Spinner constructors that you need
@Override
public boolean performClick() {
// register that the Spinner was opened so we have a status
// indicator for when the container holding this Spinner may lose focus
mOpenInitiated = true;
if (mListener != null) {
mListener.onSpinnerOpened(this);
}
return super.performClick();
}
@Override
public void onWindowFocusChanged (boolean hasFocus) {
if (hasBeenOpened() && hasFocus) {
performClosedEvent();
}
}
/**
* Register the listener which will listen for events.
*/
public void setSpinnerEventsListener(
OnSpinnerEventsListener onSpinnerEventsListener) {
mListener = onSpinnerEventsListener;
}
/**
* Propagate the closed Spinner event to the listener from outside if needed.
*/
public void performClosedEvent() {
mOpenInitiated = false;
if (mListener != null) {
mListener.onSpinnerClosed(this);
}
}
/**
* A boolean flag indicating that the Spinner triggered an open event.
*
* @return true for opened Spinner
*/
public boolean hasBeenOpened() {
return mOpenInitiated;
}
}