我正在尝试制作一个像这个的轮子选择器。我尝试下载了该项目，但.zip文件中仅包含wheel-demo.apk和notes.txt两个文件。Notes.txt没有任何关于如何在android studio中使用此文件的说明。我找到了一篇文章建议使用ListViews创建相同的效果。我花了另外一天搜索互联网，找到了这里的源代码，但是当我将文件导入我的项目时，IDE显示了数十个错误。通过试错，我设法修复了除3个错误以外的所有错误。我相信下面是相关的代码：
MainActivity.java:OnWheelScrollListener scrolledListener = new OnWheelScrollListener()
{
public void onScrollingStarted(WheelView wheel)
{
wheelScrolled = true;// "Cannot resolve symbol wheelScrolled
}
public void onScrollingFinished(WheelView wheel)
{
wheelScrolled = false;// "Cannot resolve symbol wheelScrolled
updateStatus();
}
};
// Wheel changed listener
private final OnWheelChangedListener changedListener = new OnWheelChangedListener()
{
public void onChanged(WheelView wheel, int oldValue, int newValue)
{
if (!wheelScrolled)// "Cannot resolve symbol wheelScrolled
{
updateStatus();
}
}
};
private void initWheel1(int id)
{
WheelView wheel = (WheelView) findViewById(id);
wheel.setAdapter(new ArrayWheelAdapter<String>(wheelMenu1)); //cannot resolve method 'setAdapter(com.projectname.ArrayWheelAdapter<Java.lang.String>)
wheel.setVisibleItems(2);
wheel.setCurrentItem(0);
wheel.addChangingListener(changedListener);
wheel.addScrollingListener(scrolledListener);
}
OnWheelScrollListener.java:
public interface OnWheelScrollListener {
/**
* Callback method to be invoked when scrolling started.
* @param wheel the wheel view whose state has changed.
*/
void onScrollingStarted(WheelView wheel);
/**
* Callback method to be invoked when scrolling ended.
* @param wheel the wheel view whose state has changed.
*/
void onScrollingFinished(WheelView wheel);}
OnWheelChangedListener.java:
public interface OnWheelChangedListener {
/**
* Callback method to be invoked when current item changed
* @param wheel the wheel view whose state has changed
* @param oldValue the old value of current item
* @param newValue the new value of current item
*/
void onChanged(WheelView wheel, int oldValue, int newValue);
}
ArrayWheelAdapter.java
public class ArrayWheelAdapter<T> extends AbstractWheelTextAdapter {
// items
private T items[];
/**
* Constructor
* @param context the current context
* @param items the items
*/
public ArrayWheelAdapter(Context context, T items[]) {
super(context);
//setEmptyItemResource(TEXT_VIEW_ITEM_RESOURCE);
this.items = items;
}
@Override
public CharSequence getItemText(int index) {
if (index >= 0 && index < items.length) {
T item = items[index];
if (item instanceof CharSequence) {
return (CharSequence) item;
}
return item.toString();
}
return null;
}
@Override
public int getItemsCount() {
return items.length;
}
}
所有3个.java文件已经在MainActivity的导入列表中添加，认为这可能会解决问题，但并没有。感谢迄今为止的建议。
