用wheelview实现的省市区三级联动

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();
	}
}

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资源文件列表

Android_wheel/wheel/.classpath , 380
Android_wheel/wheel/.project , 841
Android_wheel/wheel/AndroidManifest.xml , 342
Android_wheel/wheel/bin/AndroidManifest.xml , 342
Android_wheel/wheel/bin/classes/kankan/wheel/BuildConfig.class , 333
Android_wheel/wheel/bin/classes/kankan/wheel/R$attr.class , 322
Android_wheel/wheel/bin/classes/kankan/wheel/R$drawable.class , 479
Android_wheel/wheel/bin/classes/kankan/wheel/R.class , 365
Android_wheel/wheel/bin/classes/kankan/wheel/widget/adapters/AbstractWheelAdapter.class , 1840
Android_wheel/wheel/bin/classes/kankan/wheel/widget/adapters/AbstractWheelTextAdapter.class , 4758
Android_wheel/wheel/bin/classes/kankan/wheel/widget/adapters/AdapterWheel.class , 1028
Android_wheel/wheel/bin/classes/kankan/wheel/widget/adapters/ArrayWheelAdapter.class , 1305
Android_wheel/wheel/bin/classes/kankan/wheel/widget/adapters/NumericWheelAdapter.class , 1567
Android_wheel/wheel/bin/classes/kankan/wheel/widget/adapters/WheelViewAdapter.class , 458
Android_wheel/wheel/bin/classes/kankan/wheel/widget/ItemsRange.class , 873
Android_wheel/wheel/bin/classes/kankan/wheel/widget/OnWheelChangedListener.class , 204
Android_wheel/wheel/bin/classes/kankan/wheel/widget/OnWheelClickedListener.class , 207
Android_wheel/wheel/bin/classes/kankan/wheel/widget/OnWheelScrollListener.class , 239
Android_wheel/wheel/bin/classes/kankan/wheel/widget/WheelAdapter.class , 243
Android_wheel/wheel/bin/classes/kankan/wheel/widget/WheelRecycle.class , 2883
Android_wheel/wheel/bin/classes/kankan/wheel/widget/WheelScroller$1.class , 1407
Android_wheel/wheel/bin/classes/kankan/wheel/widget/WheelScroller$2.class , 1807
Android_wheel/wheel/bin/classes/kankan/wheel/widget/WheelScroller$ScrollingListener.class , 328
Android_wheel/wheel/bin/classes/kankan/wheel/widget/WheelScroller.class , 4542
Android_wheel/wheel/bin/classes/kankan/wheel/widget/WheelView$1.class , 1817
Android_wheel/wheel/bin/classes/kankan/wheel/widget/WheelView$2.class , 714
Android_wheel/wheel/bin/classes/kankan/wheel/widget/WheelView.class , 17228
Android_wheel/wheel/bin/R.txt , 69
Android_wheel/wheel/bin/wheel.jar , 24549
Android_wheel/wheel/gen/kankan/wheel/BuildConfig.java , 154
Android_wheel/wheel/gen/kankan/wheel/R.java , 432
Android_wheel/wheel/project.properties , 668
Android_wheel/wheel/res/drawable/wheel_bg.xml , 1394
Android_wheel/wheel/res/drawable/wheel_val.xml , 1038
Android_wheel/wheel/src/kankan/wheel/widget/adapters/AbstractWheelAdapter.java , 2102
Android_wheel/wheel/src/kankan/wheel/widget/adapters/AbstractWheelTextAdapter.java , 8112
Android_wheel/wheel/src/kankan/wheel/widget/adapters/AdapterWheel.java , 1578
Android_wheel/wheel/src/kankan/wheel/widget/adapters/ArrayWheelAdapter.java , 1566
Android_wheel/wheel/src/kankan/wheel/widget/adapters/NumericWheelAdapter.java , 2387
Android_wheel/wheel/src/kankan/wheel/widget/adapters/WheelViewAdapter.java , 2040
Android_wheel/wheel/src/kankan/wheel/widget/ItemsRange.java , 1762
Android_wheel/wheel/src/kankan/wheel/widget/OnWheelChangedListener.java , 1160
Android_wheel/wheel/src/kankan/wheel/widget/OnWheelClickedListener.java , 1084
Android_wheel/wheel/src/kankan/wheel/widget/OnWheelScrollListener.java , 1060
Android_wheel/wheel/src/kankan/wheel/widget/WheelAdapter.java , 1271
Android_wheel/wheel/src/kankan/wheel/widget/WheelRecycle.java , 3538
Android_wheel/wheel/src/kankan/wheel/widget/WheelScroller.java , 7293
Android_wheel/wheel/src/kankan/wheel/widget/WheelView.java , 23218
Android_wheel/wheel_province/.classpath , 475
Android_wheel/wheel_province/.project , 850
Android_wheel/wheel_province/AndroidManifest.xml , 995
Android_wheel/wheel_province/assets/city.json , 52519
Android_wheel/wheel_province/bin/AndroidManifest.xml , 995
Android_wheel/wheel_province/bin/classes/com/example/wheel_province/BuildConfig.class , 361
Android_wheel/wheel_province/bin/classes/com/example/wheel_province/CitiesActivity.class , 5579
Android_wheel/wheel_province/bin/classes/com/example/wheel_province/MainActivity.class , 924
Android_wheel/wheel_province/bin/classes/com/example/wheel_province/R$attr.class , 364
Android_wheel/wheel_province/bin/classes/com/example/wheel_province/R$dimen.class , 485
Android_wheel/wheel_province/bin/classes/com/example/wheel_province/R$drawable.class , 529
Android_wheel/wheel_province/bin/classes/com/example/wheel_province/R$id.class , 514
Android_wheel/wheel_province/bin/classes/com/example/wheel_province/R$layout.class , 456
Android_wheel/wheel_province/bin/classes/com/example/wheel_province/R$menu.class , 412
Android_wheel/wheel_province/bin/classes/com/example/wheel_province/R$string.class , 496
Android_wheel/wheel_province/bin/classes/com/example/wheel_province/R$style.class , 455
Android_wheel/wheel_province/bin/classes/com/example/wheel_province/R.class , 753
Android_wheel/wheel_province/bin/classes/kankan/wheel/R$drawable.class , 419
Android_wheel/wheel_province/bin/classes/kankan/wheel/R.class , 325
Android_wheel/wheel_province/bin/classes.dex , 733248
Android_wheel/wheel_province/bin/dexedLibs/android-support-v4-10bbad5c30746e0c8b097634852c27a5.jar , 232610
Android_wheel/wheel_province/bin/dexedLibs/wheel-a078aa33ffc18439ee60001d3df2c355.jar , 13176
Android_wheel/wheel_province/bin/jarlist.cache , 120
Android_wheel/wheel_province/bin/R.txt , 621
Android_wheel/wheel_province/bin/res/drawable-hdpi/ic_launcher.png , 5964
Android_wheel/wheel_province/bin/res/drawable-mdpi/ic_launcher.png , 3112
Android_wheel/wheel_province/bin/res/drawable-xhdpi/ic_launcher.png , 9355
Android_wheel/wheel_province/bin/res/drawable-xxhdpi/ic_launcher.png , 17889
Android_wheel/wheel_province/bin/resources.ap_ , 58969
Android_wheel/wheel_province/bin/wheel_province.apk , 307456
Android_wheel/wheel_province/gen/com/example/wheel_province/BuildConfig.java , 168
Android_wheel/wheel_province/gen/com/example/wheel_province/R.java , 2879
Android_wheel/wheel_province/gen/kankan/wheel/R.java , 369
Android_wheel/wheel_province/ic_launcher-web.png , 51394
Android_wheel/wheel_province/libs/android-support-v4.jar , 621451
Android_wheel/wheel_province/proguard-project.txt , 781
Android_wheel/wheel_province/project.properties , 600
Android_wheel/wheel_province/res/drawable-hdpi/ic_launcher.png , 7658
Android_wheel/wheel_province/res/drawable-hdpi/layout_bg.xml , 256
Android_wheel/wheel_province/res/drawable-mdpi/ic_launcher.png , 3777
Android_wheel/wheel_province/res/drawable-xhdpi/ic_launcher.png , 12516
Android_wheel/wheel_province/res/drawable-xxhdpi/ic_launcher.png , 24777
Android_wheel/wheel_province/res/layout/activity_main.xml , 669
Android_wheel/wheel_province/res/layout/citys.xml , 1798
Android_wheel/wheel_province/res/menu/main.xml , 263
Android_wheel/wheel_province/res/values/dimens.xml , 220
Android_wheel/wheel_province/res/values/strings.xml , 231
Android_wheel/wheel_province/res/values/styles.xml , 697
Android_wheel/wheel_province/res/values-sw600dp/dimens.xml , 203
Android_wheel/wheel_province/res/values-sw720dp-land/dimens.xml , 277
Android_wheel/wheel_province/res/values-v11/styles.xml , 334
Android_wheel/wheel_province/res/values-v14/styles.xml , 391
Android_wheel/wheel_province/src/com/example/wheel_province/CitiesActivity.java , 5737
Android_wheel/wheel_province/src/com/example/wheel_province/MainActivity.java , 495