实例介绍
【实例截图】
【核心代码】
package kankan.wheel.demo;
import com.example.wheeldemo.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;
import android.widget.TextView;
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);
TextView select_city = (TextView) findViewById(R.id.select_city);
select_city.setText(cities[index][getWheel(R.id.city).getCurrentItem()]);
}
private WheelView getWheel(int id) {
return (WheelView) findViewById(id);
}
/**
* 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];
}
}
}
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