Android(安卓)省市县 三级联动(android-wheel的使用)
16lz
2021-01-26
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 ="";@Overrideprotected 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 */@Overridepublic 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
更多相关文章
- ArcGIS for Android地图控件的5大常见操作转
- RxJava教程(四)在Android中使用RxJava
- ViewPager实现引导页
- Android(安卓)Audio AudioEffect
- Android(安卓)Flutter:Dart语言(布局篇)
- Android中SharedPreferences使用方法介绍
- Android获取当前位置,location为空
- 深入浅出RxJava1(四:在Android中使用响应式编程)
- Android(安卓)Volley使用之二:Volley请求网络图片