Android实现WheelView

        在iOS里面有一种控件------滚筒控件（Wheel View），这通常用于设置时间/日期，非常方便，但Android SDK并没有提供类似的控件。这里说一下我的实现。
先看效果图

 

• 1. checkout代码

            网上有开源的代码实现了改功能。svn地址：。checkout代码后加入项目中。
          2. 实现WheelViewAdapter
            

package com.ccn.ui;

import java.util.List;

import android.content.Context;
import android.database.DataSetObserver;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import com.ccn.R;
import com.ccn.widget.WheelViewAdapter;

/**
 * @todo 货币适配器
 * @author ShuLiQun
 * @date 2013-6-8
 */
public class CurrencyAdapter implements WheelViewAdapter {
    private List<String> lists;
    private Context context;

    public void setLists(List<String> lists, Context context) {
        this.lists = lists;
        this.context = context;
    }

    @Override
    public int getItemsCount() {
        return lists.size();
    }

    @Override
    public View getItem(int index, View convertView, ViewGroup parent) {
        Info info;
        if (convertView == null) {
            convertView = LayoutInflater.from(context).inflate(R.layout.cc_item, null);
            info = new Info();
            info.tv = (TextView) convertView.findViewById(R.id.text1);
            convertView.setTag(info);
        } else {
            info = (Info) convertView.getTag();
        }

        info.tv.setText(lists.get(index));
        return convertView;
    }

    private static class Info {
        TextView tv;
    }

    @Override
    public View getEmptyItem(View convertView, ViewGroup parent) {
        return null;
    }

    @Override
    public void registerDataSetObserver(DataSetObserver observer) {

    }

    @Override
    public void unregisterDataSetObserver(DataSetObserver observer) {

    }

}

        3. 布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android=""
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@color/transport"
    android:orientation="vertical" >

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="0dp"
        android:layout_weight="4"
        android:background="@drawable/wheel_view_bg"
        android:orientation="horizontal" >

        <LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_margin="10dp"
            android:orientation="horizontal" >

            <com.ccn.widget.WheelView
                android:id="@+id/wvCurrency1"
                android:layout_width="0dp"
                android:layout_height="fill_parent"
                android:layout_weight="1" />

            <com.ccn.widget.WheelView
                android:id="@+id/wvCurrency2"
                android:layout_width="0dp"
                android:layout_height="fill_parent"
                android:layout_weight="1" />

            <com.ccn.widget.WheelView
                android:id="@+id/wvCurrency3"
                android:layout_width="0dp"
                android:layout_height="fill_parent"
                android:layout_weight="1" />

            <com.ccn.widget.WheelView
                android:id="@+id/wvCurrency4"
                android:layout_width="0dp"
                android:layout_height="fill_parent"
                android:layout_weight="1" />
        </LinearLayout>

        <View
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:visibility="gone" />
    </LinearLayout>

</LinearLayout>

        4. 在界面添加
     

package com.ccn.ui;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.Animation;
import android.view.animation.TranslateAnimation;
import android.widget.ImageView;
import android.widget.LinearLayout;

import com.ccn.R;
import com.ccn.util.ImageUtil;
import com.ccn.widget.OnWheelScrollListener;
import com.ccn.widget.WheelView;

/**
 * @todo Tab页面手势滑动切换以及动画效果
 * @author ShuLiQun
 * @date 2013-6-7
 */
public class ConversionUI extends Activity implements OnClickListener, OnPageChangeListener, OnWheelScrollListener {
    private WheelView wv1;
    private WheelView wv2;
    private WheelView wv3;
    private WheelView wv4;


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.conversion);

        initWheelView();
    }

    /**
     * @todo 初始化滚筒
     * @date 2013-6-8
     */
    private void initWheelView() {
        wv1 = (WheelView) llConverter.findViewById(R.id.wvCurrency1);
        wv2 = (WheelView) llConverter.findViewById(R.id.wvCurrency2);
        wv3 = (WheelView) llConverter.findViewById(R.id.wvCurrency3);
        wv4 = (WheelView) llConverter.findViewById(R.id.wvCurrency4);
        String[] items = getResources().getStringArray(R.array.money);
        lists = Arrays.asList(items);
        currencyAdapter.setLists(lists, this);
        wv1.setViewAdapter(currencyAdapter);
        wv2.setViewAdapter(currencyAdapter);
        wv3.setViewAdapter(currencyAdapter);
        wv4.setViewAdapter(currencyAdapter);

        wv1.addScrollingListener(this);
        wv2.addScrollingListener(this);
        wv3.addScrollingListener(this);
        wv4.addScrollingListener(this);
    }

    @Override
    public void onScrollingStarted(WheelView wheel) {


    }

    @Override
    public void onScrollingFinished(WheelView wheel) {
        if (wheel == wv1) {
            System.err.println("wv1============="+lists.get(wheel.getCurrentItem()));
        }else if (wheel == wv2) {
            System.err.println("wv2============="+lists.get(wheel.getCurrentItem()));
        }else if (wheel == wv3) {
            System.err.println("wv3============="+lists.get(wheel.getCurrentItem()));
        }else if (wheel == wv4) {
            System.err.println("wv4============="+lists.get(wheel.getCurrentItem()));
        }


    }
}

        5. 总结
            代码是在一个项目中，就只贴了部分代码，我也正在研究中。