这个库包含两种类型的滚轮：普通滚轮和立体滚轮，普通滚轮调用WheelView，立体滚轮调用Wheel3DView。两种滚轮实现原理相同，但显示效果不同。立体滚轮类似IOS时间选择控件，效果如下。
compile 'com.cncoderx.wheelview:library:1.2.7'
<com.cncoderx.wheelview.Wheel3DView
android:id="@+id/wheel3d"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
app:wheelCyclic="true"
app:wheelEntries="@array/default_array"
app:wheelItemCount="9"
app:wheelItemWidth="160dp"
app:wheelItemHeight="40dp"
app:wheelTextSize="@dimen/wheel_text_size"
app:wheelTextColor="@color/wheel_text_color"
app:wheelSelectedTextColor="@color/wheel_selected_text_color"
app:wheelDividerColor="@color/wheel_divider_color"
app:wheelHighlightColor="@color/wheel_highlight_color" />WheelView wheelView = (WheelView) findViewById(R.id.wheel);
wheelView.setOnWheelChangedListener(new OnWheelChangedListener() {
@Override
public void onChanged(WheelView view, int oldIndex, int newIndex) {
CharSequence text = view.getItem(newIndex);
Log.i("WheelView", String.format("index: %d, text: %s", newIndex, text));
}
});