Android 省市县 三级联动(android-wheel的使用)

jopen 9年前

转载请注明出处:http://blog.csdn.net/lmj623565791/article/details/23382805

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

{"citylist":   [{"p":"河北",     "c":[{"n":"石家庄",     "a":[{"s":"长安区"},{"s":"桥东区"},{"s":"鹿泉市"}]   }]  }

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:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"      xmlns:tools="http://schemas.android.com/tools"      android:layout_width="match_parent"      android:layout_height="match_parent"      android:background="#000000"      android:orientation="vertical" >        <TextView          android:layout_width="wrap_content"          android:layout_height="wrap_content"          android:layout_gravity="center"          android:layout_margin="10dp"          android:text="请选择城市"          android:textColor="#ffffff"          android:textSize="20sp" />        <LinearLayout          android:layout_width="fill_parent"          android:layout_height="wrap_content"          android:background="@drawable/layout_bg"          android:orientation="horizontal" >            <kankan.wheel.widget.WheelView              android:id="@+id/id_province"              android:layout_width="0dp"              android:layout_height="wrap_content"              android:layout_weight="1" >          </kankan.wheel.widget.WheelView>            <kankan.wheel.widget.WheelView              android:id="@+id/id_city"              android:layout_width="0dp"              android:layout_height="wrap_content"              android:layout_weight="1" >          </kankan.wheel.widget.WheelView>            <kankan.wheel.widget.WheelView              android:id="@+id/id_area"              android:layout_width="0dp"              android:layout_height="wrap_content"              android:layout_weight="1" >          </kankan.wheel.widget.WheelView>      </LinearLayout>            <Button     android:onClick="showChoose"    android:layout_gravity="right"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="确定"          />          </LinearLayout>
5、Activity的编写:注释相当详细,节不赘述了。
package com.example.wheel_province;    import java.io.IOException;  import java.io.InputStream;  import java.util.HashMap;  import java.util.Map;    import kankan.wheel.widget.OnWheelChangedListener;  import kankan.wheel.widget.WheelView;  import kankan.wheel.widget.adapters.ArrayWheelAdapter;    import org.json.JSONArray;  import org.json.JSONException;  import org.json.JSONObject;    import android.app.Activity;  import android.os.Bundle;  import android.view.View;  import android.widget.Toast;    /**   *    * @author zhy   *    */  public class CitiesActivity extends Activity implements OnWheelChangedListener  {   /**    * 把全国的省市区的信息以json的格式保存,解析完成后赋值为null    */   private JSONObject mJsonObj;   /**    * 省的WheelView控件    */   private WheelView mProvince;   /**    * 市的WheelView控件    */   private WheelView mCity;   /**    * 区的WheelView控件    */   private WheelView mArea;     /**    * 所有省    */   private String[] mProvinceDatas;   /**    * key - 省 value - 市s    */   private Map<String, String[]> mCitisDatasMap = new HashMap<String, String[]>();   /**    * key - 市 values - 区s    */   private Map<String, String[]> mAreaDatasMap = new HashMap<String, String[]>();     /**    * 当前省的名称    */   private String mCurrentProviceName;   /**    * 当前市的名称    */   private String mCurrentCityName;   /**    * 当前区的名称    */   private String mCurrentAreaName ="";     @Override   protected void onCreate(Bundle savedInstanceState)   {    super.onCreate(savedInstanceState);    setContentView(R.layout.citys);      initJsonData();      mProvince = (WheelView) findViewById(R.id.id_province);    mCity = (WheelView) findViewById(R.id.id_city);    mArea = (WheelView) findViewById(R.id.id_area);      initDatas();      mProvince.setViewAdapter(new ArrayWheelAdapter<String>(this, mProvinceDatas));    // 添加change事件    mProvince.addChangingListener(this);    // 添加change事件    mCity.addChangingListener(this);    // 添加change事件    mArea.addChangingListener(this);      mProvince.setVisibleItems(5);    mCity.setVisibleItems(5);    mArea.setVisibleItems(5);    updateCities();    updateAreas();     }     /**    * 根据当前的市,更新区WheelView的信息    */   private void updateAreas()   {    int pCurrent = mCity.getCurrentItem();    mCurrentCityName = mCitisDatasMap.get(mCurrentProviceName)[pCurrent];    String[] areas = mAreaDatasMap.get(mCurrentCityName);      if (areas == null)    {     areas = new String[] { "" };    }    mArea.setViewAdapter(new ArrayWheelAdapter<String>(this, areas));    mArea.setCurrentItem(0);   }     /**    * 根据当前的省,更新市WheelView的信息    */   private void updateCities()   {    int pCurrent = mProvince.getCurrentItem();    mCurrentProviceName = mProvinceDatas[pCurrent];    String[] cities = mCitisDatasMap.get(mCurrentProviceName);    if (cities == null)    {     cities = new String[] { "" };    }    mCity.setViewAdapter(new ArrayWheelAdapter<String>(this, cities));    mCity.setCurrentItem(0);    updateAreas();   }     /**    * 解析整个Json对象,完成后释放Json对象的内存    */   private void initDatas()   {    try    {     JSONArray jsonArray = mJsonObj.getJSONArray("citylist");     mProvinceDatas = new String[jsonArray.length()];     for (int i = 0; i < jsonArray.length(); i++)     {      JSONObject jsonP = jsonArray.getJSONObject(i);// 每个省的json对象      String province = jsonP.getString("p");// 省名字        mProvinceDatas[i] = province;        JSONArray jsonCs = null;      try      {       /**        * Throws JSONException if the mapping doesn't exist or is        * not a JSONArray.        */       jsonCs = jsonP.getJSONArray("c");      } catch (Exception e1)      {       continue;      }      String[] mCitiesDatas = new String[jsonCs.length()];      for (int j = 0; j < jsonCs.length(); j++)      {       JSONObject jsonCity = jsonCs.getJSONObject(j);       String city = jsonCity.getString("n");// 市名字       mCitiesDatas[j] = city;       JSONArray jsonAreas = null;       try       {        /**         * Throws JSONException if the mapping doesn't exist or         * is not a JSONArray.         */        jsonAreas = jsonCity.getJSONArray("a");       } catch (Exception e)       {        continue;       }         String[] mAreasDatas = new String[jsonAreas.length()];// 当前市的所有区       for (int k = 0; k < jsonAreas.length(); k++)       {        String area = jsonAreas.getJSONObject(k).getString("s");// 区域的名称        mAreasDatas[k] = area;       }       mAreaDatasMap.put(city, mAreasDatas);      }        mCitisDatasMap.put(province, mCitiesDatas);     }      } catch (JSONException e)    {     e.printStackTrace();    }    mJsonObj = null;   }     /**    * 从assert文件夹中读取省市区的json文件,然后转化为json对象    */   private void initJsonData()   {    try    {     StringBuffer sb = new StringBuffer();     InputStream is = getAssets().open("city.json");     int len = -1;     byte[] buf = new byte[1024];     while ((len = is.read(buf)) != -1)     {      sb.append(new String(buf, 0, len, "gbk"));     }     is.close();     mJsonObj = new JSONObject(sb.toString());    } catch (IOException e)    {     e.printStackTrace();    } catch (JSONException e)    {     e.printStackTrace();    }   }     /**    * change事件的处理    */   @Override   public void onChanged(WheelView wheel, int oldValue, int newValue)   {    if (wheel == mProvince)    {     updateCities();    } else if (wheel == mCity)    {     updateAreas();    } else if (wheel == mArea)    {     mCurrentAreaName = mAreaDatasMap.get(mCurrentCityName)[newValue];    }   }     public void showChoose(View view)   {    Toast.makeText(this, mCurrentProviceName + mCurrentCityName + mCurrentAreaName, 1).show();   }  }

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~


源码下载点击这里



来自: http://blog.csdn.net//lmj623565791/article/details/23382805