Based on AppCompatAutoCompleteTextView suggestions

DropDownSpinner.java

import android.content.Context;
import android.graphics.Rect;
import android.support.v7.widget.AppCompatAutoCompleteTextView;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import android.widget.AdapterView;

// style it with @style/Widget.AppCompat.Spinner.Underlined
public class DropDownSpinner extends AppCompatAutoCompleteTextView {

    private boolean isPopup;

    public DropDownSpinner(Context context) {
        super(context);
        init();
    }

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

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

    private void init() {
        super.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                isPopup = false;
            }
        });
    }

    @Override
    public boolean enoughToFilter() {
        return true;
    }

    @Override
    protected void onFocusChanged(boolean focused, int direction, Rect previouslyFocusedRect) {
        super.onFocusChanged(focused, direction, previouslyFocusedRect);
        if (focused) {
            InputMethodManager imm = (InputMethodManager) getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
            imm.hideSoftInputFromWindow(getWindowToken(), 0);
            setKeyListener(null);
        } else {
            isPopup = false;
        }
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (MotionEvent.ACTION_UP == event.getAction()) {
            if (isPopup) {
                dismissDropDown();
                isPopup = false;
            } else {
                requestFocus();
                DropDownSpinner.super.showDropDown();
                isPopup = true;
            }
        }
        return super.onTouchEvent(event);
    }

    @Override
    public void dismissDropDown() {
        isPopup = false;
        super.dismissDropDown();
    }

    @Override
    public void showDropDown() {
        // XXX we can show it by click only
    }

    @Override
    public void setOnItemClickListener(AdapterView.OnItemClickListener l) {
        throw new RuntimeException("OnItemClickListener is used for internal stuff, use OnItemSelectedListener instead");
    }

}