今天没事跟群里面侃大山，有个哥们说道AndroidWheel这个控件，以为是Andriod内置的控件，google一把，发现是个github上的一个控件。 下载地址：https://code.google.com/p/android-wheel/ 发现很适合做省市县三级联动就做了一个。 先看下效果图： 1 、首先导
今天没事跟群里面侃大山，有个哥们说道Android Wheel这个控件，以为是Andriod内置的控件，google一把，发现是个github上的一个控件。
下载地址：https://code.google.com/p/android-wheel/ 发现很适合做省市县三级联动就做了一个。
先看下效果图：
1、首先导入github上的wheel项目
2、新建个项目，然后选择记得右键->Properties->Android中将wheel添加为lib：
上面两个步骤是导入所有开源项目的过程了。
3、下面开始代码的编写：首先是省市区的json文件，放置在asserts的city.json中：
大概的格式先了解一下，一会代码会根据这样的格式解析
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{"citylist":
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[{"p":"河北",
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"c":[{"n":"石家庄",
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"a":[{"s":"长安区"},{"s":"桥东区"}，{"s":"鹿泉市"}]
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}]
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}
4、布局文件，比较简单就3个WheelView分别代表省，市，县，还有一个按钮：
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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:tools="http://schemas.android.com/tools"
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android:layout_width="match_parent"
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android:layout_height="match_parent"
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android:background="#000000"
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android:orientation="vertical" >
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<TextView
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:layout_gravity="center"
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android:layout_margin="10dp"
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android:text="请选择城市"
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android:textColor="#ffffff"
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android:textSize="20sp" />
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<LinearLayout
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android:layout_width="fill_parent"
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android:layout_height="wrap_content"
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android:background="@drawable/layout_bg"
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android:orientation="horizontal" >
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<kankan.wheel.widget.WheelView
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android:id="@+id/id_province"
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android:layout_width="0dp"
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android:layout_height="wrap_content"
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android:layout_weight="1" >
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</kankan.wheel.widget.WheelView>
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<kankan.wheel.widget.WheelView
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android:id="@+id/id_city"
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android:layout_width="0dp"
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android:layout_height="wrap_content"
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android:layout_weight="1" >
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</kankan.wheel.widget.WheelView>
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<kankan.wheel.widget.WheelView
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android:id="@+id/id_area"
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android:layout_width="0dp"
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android:layout_height="wrap_content"
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android:layout_weight="1" >
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</kankan.wheel.widget.WheelView>
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</LinearLayout>
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<Button
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android:onClick="showChoose"
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android:layout_gravity="right"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:text="确定"
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/>
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</LinearLayout>
5、Activity的编写：注释相当详细，节不赘述了。
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package com.example.wheel_province;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.HashMap;
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import java.util.Map;
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import kankan.wheel.widget.OnWheelChangedListener;
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import kankan.wheel.widget.WheelView;
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import kankan.wheel.widget.adapters.ArrayWheelAdapter;
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import org.json.JSONArray;
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import org.json.JSONException;
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import org.json.JSONObject;
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import android.app.Activity;
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import android.os.Bundle;
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import android.view.View;
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import android.widget.Toast;
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public class CitiesActivity extends Activity implements OnWheelChangedListener
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{
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private JSONObject mJsonObj;
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private WheelView mProvince;
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private WheelView mCity;
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private WheelView mArea;
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private String[] mProvinceDatas;
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private Map<String, String[]> mCitisDatasMap = new HashMap<String, String[]>();
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private Map<String, String[]> mAreaDatasMap = new HashMap<String, String[]>();
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private String mCurrentProviceName;
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private String mCurrentCityName;
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private String mCurrentAreaName ="";
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@Override
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protected void onCreate(Bundle savedInstanceState)
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{
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super.onCreate(savedInstanceState);
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setContentView(R.layout.citys);
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initJsonData();
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mProvince = (WheelView) findViewById(R.id.id_province);
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mCity = (WheelView) findViewById(R.id.id_city);
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mArea = (WheelView) findViewById(R.id.id_area);
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initDatas();
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mProvince.setViewAdapter(new ArrayWheelAdapter<String>(this, mProvinceDatas));
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mProvince.addChangingListener(this);
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mCity.addChangingListener(this);
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mArea.addChangingListener(this);
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mProvince.setVisibleItems(5);
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mCity.setVisibleItems(5);
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mArea.setVisibleItems(5);
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updateCities();
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updateAreas();
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}
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private void updateAreas()
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{
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int pCurrent = mCity.getCurrentItem();
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mCurrentCityName = mCitisDatasMap.get(mCurrentProviceName)[pCurrent];
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String[] areas = mAreaDatasMap.get(mCurrentCityName);
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if (areas == null)
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{
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areas = new String[] { "" };
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}
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mArea.setViewAdapter(new ArrayWheelAdapter<String>(this, areas));
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mArea.setCurrentItem(0);
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}
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private void updateCities()
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{
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int pCurrent = mProvince.getCurrentItem();
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mCurrentProviceName = mProvinceDatas[pCurrent];
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String[] cities = mCitisDatasMap.get(mCurrentProviceName);
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if (cities == null)
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{
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cities = new String[] { "" };
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}
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mCity.setViewAdapter(new ArrayWheelAdapter<String>(this, cities));
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mCity.setCurrentItem(0);
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updateAreas();
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}
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private void initDatas()
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{
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try
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{
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JSONArray jsonArray = mJsonObj.getJSONArray("citylist");
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mProvinceDatas = new String[jsonArray.length()];
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for (int i = 0; i < jsonArray.length(); i++)
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{
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JSONObject jsonP = jsonArray.getJSONObject(i);
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String province = jsonP.getString("p");
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mProvinceDatas[i] = province;
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JSONArray jsonCs = null;
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try
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{
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jsonCs = jsonP.getJSONArray("c");
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} catch (Exception e1)
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{
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continue;
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}
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String[] mCitiesDatas = new String[jsonCs.length()];
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for (int j = 0; j < jsonCs.length(); j++)
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{
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JSONObject jsonCity = jsonCs.getJSONObject(j);
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String city = jsonCity.getString("n");
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mCitiesDatas[j] = city;
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JSONArray jsonAreas = null;
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try
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{
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jsonAreas = jsonCity.getJSONArray("a");
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} catch (Exception e)
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{
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continue;
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}
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String[] mAreasDatas = new String[jsonAreas.length()];
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for (int k = 0; k < jsonAreas.length(); k++)
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{
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String area = jsonAreas.getJSONObject(k).getString("s");
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mAreasDatas[k] = area;
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}
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mAreaDatasMap.put(city, mAreasDatas);
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}
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mCitisDatasMap.put(province, mCitiesDatas);
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}
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} catch (JSONException e)
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{
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e.printStackTrace();
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}
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mJsonObj = null;
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}
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private void initJsonData()
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{
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try
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{
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StringBuffer sb = new StringBuffer();
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InputStream is = getAssets().open("city.json");
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int len = -1;
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byte[] buf = new byte[1024];
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while ((len = is.read(buf)) != -1)
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{
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sb.append(new String(buf, 0, len, "gbk"));
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}
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is.close();
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mJsonObj = new JSONObject(sb.toString());
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} catch (IOException e)
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{
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e.printStackTrace();
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} catch (JSONException e)
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{
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e.printStackTrace();
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}
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}
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@Override
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public void onChanged(WheelView wheel, int oldValue, int newValue)
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{
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if (wheel == mProvince)
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{
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updateCities();
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} else if (wheel == mCity)
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{
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updateAreas();
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} else if (wheel == mArea)
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{
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mCurrentAreaName = mAreaDatasMap.get(mCurrentCityName)[newValue];
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}
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}
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public void showChoose(View view)
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{
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Toast.makeText(this, mCurrentProviceName + mCurrentCityName + mCurrentAreaName, 1).show();
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}
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}
这样就完成了代码的编写，如果这篇文章对你有帮助，可以顶一个~嘿嘿~
如果要实现省市区三级联动的滚轮效果，可以参考这篇文章：http://www.codesocang.com/anzhuoyuanma/boke/34165.html
源码下载点击这里
Android 省市县 三级联动（android-wheel的使用）
转载https://www.codesocang.com/appboke/34167.html
