Android spinner close

  public static void hideSpinnerDropDown(Spinner spinner) {
    try {
        Method method = Spinner.class.getDeclaredMethod("onDetachedFromWindow");
        method.setAccessible(true);
        method.invoke(spinner);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

This works for me:

class SomeAdapter extends BaseAdapter implements SpinnerAdapter {
    //......   
    public View getDropDownView(int position, View convertView, ViewGroup parent) {
        View view = convertView;
        if (view == null) {
            //......
        }
        view.setOnClickListener(new ItemOnClickListener(parent));
        return view;
    }
    //.....
}

and the click listener:

class ItemOnClickListener implements View.OnClickListener {
    private View _parent;

    public ItemOnClickListener(ViewGroup parent) {
        _parent = parent;
    }

    @Override
    public void onClick(View view) {
        //.......
        // close the dropdown
        View root = _parent.getRootView();
        root.dispatchKeyEvent(new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_BACK));
        root.dispatchKeyEvent(new KeyEvent(KeyEvent.ACTION_UP, KeyEvent.KEYCODE_BACK));
    }
}

Well its a little complicated than I thought.

I am adding the step by step details here. Try to follow it. I was able to achieve this in api level 10.

And this solution assumes that you are supposed to close the prompt dialog programatically when the user clicks on Home Button or If you had to move to next activity without user interaction

The first step is to create a Custom Spinner by extending Spinner Class. Let's say, I have created a class called CustomSpinner in the package com.bts.sampleapp

My CustomSpinner class looks like this,

package com.bts.sampleapp;

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

    public class CustomSpinner extends Spinner{
        Context context=null;

        public CustomSpinner(Context context) {
            super(context);
            this.context=context;
        }

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

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

        @Override
        public void onDetachedFromWindow() {
            super.onDetachedFromWindow();
        }
    }

Now in your Xml file, replace Spinner element by this custom spinner,

        <com.bts.sampleapp.CustomSpinner
        android:id="@+id/spin"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

The next step is to initialize and set adapter to this spinner in your Activity class,

    @Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    CustomSpinner spin=null;
    spin=(CustomSpinner)findViewById(R.id.spin);
    spin.setAdapter(spinnerAdapter); //you can set your adapter here.
}

The final step is to close the dialog when the user clicks on HomeButton or When the Activity moves to background. To do this, we override the onPause() like this,

@Override
    protected void onPause() {
        Log.i("Life Cycle", "onPause");
        spin.onDetachedFromWindow();
        super.onPause();
    }

Now within the onPause() call the method spin.onDetachedFromWindow(); which does the job of closing the prompt dialog for you.

Now that being said, calling spin.onDetachedFromWindow(); from anywhere in your Activity should help you to close the spinner programatically. So if this is what you want, then remove the onpause().