确定我从轮式机器人中选择了什么

Question

我正在使用来自here的轮子选择器的代码。假设我想实现像citiesactivities.java这样的东西。代码如下。我现在想要的是:当用户使用滑块选择他想要的东西时，按下按钮Go并将他带到一个新的活动。所以我必须在某个地方插入一个buttonOnClickListener，但是我不知道在哪里？我的意思是，在代码中，用户选择的项目是在哪里指定的？我的意思是，如果选择加拿大和温哥华，请按go并将他带到多伦多，如果是多伦多到CanadaTorontoActivity，依此类推。

代码如下：

package kankan.wheel.demo;

import kankan.wheel.R;
import kankan.wheel.widget.OnWheelChangedListener;
import kankan.wheel.widget.OnWheelScrollListener;
import kankan.wheel.widget.WheelView;
import kankan.wheel.widget.adapters.AbstractWheelTextAdapter;
import kankan.wheel.widget.adapters.ArrayWheelAdapter;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;

public class CitiesActivity extends Activity {
    // Scrolling flag
    private boolean scrolling = false;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.cities_layout);

        final WheelView country = (WheelView) findViewById(R.id.country);
        country.setVisibleItems(3);
        country.setViewAdapter(new CountryAdapter(this));

        final String cities[][] = new String[][] {
                new String[] {"New York", "Washington", "Chicago", "Atlanta", "Orlando"},
                new String[] {"Ottawa", "Vancouver", "Toronto", "Windsor", "Montreal"},
                new String[] {"Kiev", "Dnipro", "Lviv", "Kharkiv"},
                new String[] {"Paris", "Bordeaux"},
                };

        final WheelView city = (WheelView) findViewById(R.id.city);
        city.setVisibleItems(5);

        country.addChangingListener(new OnWheelChangedListener() {
            public void onChanged(WheelView wheel, int oldValue, int newValue) {
                if (!scrolling) {
                    updateCities(city, cities, newValue);
                }
            }
        });

        country.addScrollingListener( new OnWheelScrollListener() {
            public void onScrollingStarted(WheelView wheel) {
                scrolling = true;
            }
            public void onScrollingFinished(WheelView wheel) {
                scrolling = false;
                updateCities(city, cities, country.getCurrentItem());
            }
        });

        country.setCurrentItem(1);
    }

    /**
     * Updates the city wheel
     */
    private void updateCities(WheelView city, String cities[][], int index) {
        ArrayWheelAdapter<String> adapter =
            new ArrayWheelAdapter<String>(this, cities[index]);
        adapter.setTextSize(18);
        city.setViewAdapter(adapter);
        city.setCurrentItem(cities[index].length / 2);        
    }

    /**
     * Adapter for countries
     */
    private class CountryAdapter extends AbstractWheelTextAdapter {
        // Countries names
        private String countries[] =
            new String[] {"USA", "Canada", "Ukraine", "France"};
        // Countries flags
        private int flags[] =
            new int[] {R.drawable.usa, R.drawable.canada, R.drawable.ukraine, R.drawable.france};

        /**
         * Constructor
         */
        protected CountryAdapter(Context context) {
            super(context, R.layout.country_layout, NO_RESOURCE);

            setItemTextResource(R.id.country_name);
        }

        @Override
        public View getItem(int index, View cachedView, ViewGroup parent) {
            View view = super.getItem(index, cachedView, parent);
            ImageView img = (ImageView) view.findViewById(R.id.flag);
            img.setImageResource(flags[index]);
            return view;
        }

        @Override
        public int getItemsCount() {
            return countries.length;
        }

        @Override
        protected CharSequence getItemText(int index) {
            return countries[index];
        }
    }
}

Answer 1

我终于找到了答案。包中有一个名为getCurrentItem()的函数。