Spinner:获取状态或在打开时收到通知

Question

是否可以知道a Spinner是开放还是关闭？如果有一些onOpenListener for Spinners会更好.

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东西,窗口将会关闭(在executeSomething()中).但是如果我在对话框外单击,我也不会收到通知,这也会关闭微调器

Answer 1

观察这些事件的另一个选择是扩展Spinner类并使用其中一个方法(performClick()将触发其对话框/弹出窗口),然后监视持有此自定义的窗口的焦点Spinner.这应该为您提供所有可能的完成可能性(对于对话框或下拉模式)的所需闭合事件.

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;
    }

}

Answer 2

基于@Luksprog精彩的解决方案,我只想添加一个小的更改,如果有人在片段中使用CustomSpinner,这将非常有用.而不是使用该Activity.onWindowFocusChanged函数,我们重写该View.onWindowFocusChanged函数.因此整个CustomSpinner类成为

import android.content.Context;
import android.util.AttributeSet;
import android.widget.Spinner;

public class CustomSpinner extends Spinner {
    private static final String TAG = "CustomSpinner";
    private OnSpinnerEventsListener mListener;
    private boolean mOpenInitiated = false;

    public CustomSpinner(Context context, AttributeSet attrs, int defStyleAttr, int mode) {
        super(context, attrs, defStyleAttr, mode);
    }

    public CustomSpinner(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    public CustomSpinner(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public CustomSpinner(Context context, int mode) {
        super(context, mode);
    }

    public CustomSpinner(Context context) {
        super(context);
    }

    public interface OnSpinnerEventsListener {

        void onSpinnerOpened();

        void onSpinnerClosed();

    }

    @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;
    }

    @Override
    public void onWindowFocusChanged(boolean hasWindowFocus) {
        android.util.Log.d(TAG, "onWindowFocusChanged");
        super.onWindowFocusChanged(hasWindowFocus);
        if (hasBeenOpened() && hasWindowFocus) {
            android.util.Log.i(TAG, "closing popup");
            performClosedEvent();
        }
    }
}

Answer 3

嗨朋友我在过去的两天里在这个问题上苦苦挣扎,最后我得到了完成我的工作的以下解决方案.我尝试过,它完美无缺.谢谢

 mSpinner.setOnTouchListener(new OnTouchListener(){

                @Override
                public boolean onTouch(View v, MotionEvent event) {
                   if(event.getAction() == MotionEvent.ACTION_DOWN){
                       Toast.makeText(MapActivity.this,"down",Toast.LENGTH_LONG).show();
                    // Load your spinner here
                   }
                    return false;
                }

            });