微调：获得国家或得到通知打开时 [英] Spinner: get state or get notified when opens

问题描述

是否有可能知道是否微调是打开还是关闭？它甚至会更好，如果有对纱厂某种onOpenListener的。

Is it possible to know whether a Spinner is open or closed? It would even be better if there was some sort of onOpenListener for Spinners.

我使用的是OnItemSelectedListener这样的尝试：

I've tried using an OnItemSelectedListener like this:

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，如果事情是选择的窗口将关闭（在executeSomething（））。但是，我没有得到通知，如果我点击对话，这也关闭了微调之外

I can know that the window will close if something is selected (in executeSomething()). But I don't get notified if I click outside of the Dialog, which also closes the spinner

推荐答案

，以观察这些事件的另一个选择是延长微调类，并使用它的方法之一（ performClick 将触发其对话框/弹出），通过监测活动的焦点。这应该给你想要关闭的事件所有可能整理的可能性（对于对话框或下拉列表模式）：

Another option to watch for those events is to extend the Spinner class and use one of its methods(performClick which will trigger its dialog/popup) followed by monitoring the focus of the Activity. This should give you the wanted closed event for all the possible finishing possibilities(for either the dialog or dropdown mode):

public interface OnSpinnerEventsListener {

    void onSpinnerOpened();

    void onSpinnerClosed();

}

自定义微调类：

public static class CustomSpinner extends Spinner {

    private OnSpinnerEventsListener mListener;
    private boolean mOpenInitiated = false;

    // the Spinner constructors

    @Override
    public boolean performClick() {
        // register that the Spinner was opened so we have a status
        // indicator for the activity(which may lose focus for some other
        // reasons)
        mOpenInitiated = true;
        if (mListener != null) {
            mListener.onSpinnerOpened();
        }
        return super.performClick();
    }

    public void setSpinnerEventsListener(
            OnSpinnerEventsListener onSpinnerEventsListener) {
        mListener = onSpinnerEventsListener;
    }

    /**
     * Propagate the closed Spinner event to the listener from outside.
     */
    public void performClosedEvent() {
        mOpenInitiated = false;
        if (mListener != null) {
            mListener.onSpinnerClosed();
        }
    }

    /**
     * A boolean flag indicating that the Spinner triggered an open event.
     * 
     * @return true for opened Spinner 
     */
    public boolean hasBeenOpened() {
        return mOpenInitiated;
    }

}

和的活动的重点手表：

@Override
public void onWindowFocusChanged(boolean hasFocus) {
    super.onWindowFocusChanged(hasFocus);
    // mSpin is our custom Spinner
    if (mSpin.hasBeenOpened() && hasFocus) {
        mSpin.performClosedEvent();
    }
}

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