Android 省市区三级联动读取本地json-ohhhhhkim

Android 省市区三级联动读取本地json

package com.example.address;

import java.io.IOException;

import java.io.InputStream;

import java.util.HashMap;

import java.util.Map;

import org.json.JSONArray;

import org.json.JSONException;

import org.json.JSONObject;

import android.app.Activity;

import android.content.res.AssetManager;

import android.os.Bundle;

import android.text.TextUtils;

import android.util.Log;

import android.view.View;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemSelectedListener;

import android.widget.ArrayAdapter;

import android.widget.Spinner;

import android.widget.TextView;

public class MainActivity extends Activity {

private static final String TAG = "MainActivity";

private TextView tv_address;

// 省份

private String[] mProvinceDatas;

// 城市

private String[] mCitiesDatas;

// 地区

private String[] mAreaDatas;

// 列表选择的省市区

private String selectedPro = "";

private String selectedCity = "";

private String selectedArea = "";

private Spinner mProvinceSpinner;

private Spinner mCitySpinner;

private Spinner mAreaSpinner;

private ArrayAdapter<String> mProvinceAdapter;

private ArrayAdapter<String> mCityAdapter;

private ArrayAdapter<String> mAreaAdapter;

// 存储省对应的所有市

private Map<String, String[]> mCitiesDataMap = new HashMap<String, String[]>();

// 存储市对应的所有区

private Map<String, String[]> mAreaDataMap = new HashMap<String, String[]>();

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

BeginJsonCitisData(InitData());

tv_address = (TextView) findViewById(R.id.select_down);

mProvinceSpinner = (Spinner) findViewById(R.id.province);

mCitySpinner = (Spinner) findViewById(R.id.city);

mAreaSpinner = (Spinner) findViewById(R.id.area);

mProvinceAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, mProvinceDatas);

mProvinceAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

mProvinceSpinner.setAdapter(mProvinceAdapter);

// 省份选择

mProvinceSpinner.setOnItemSelectedListener(new OnItemSelectedListener() {

@Override

public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

selectedPro = "";

selectedPro = (String) parent.getSelectedItem();

// 根据省份更新城市区域信息

updateCity(selectedPro);

Log.d(TAG, "mProvinceSpinner has excuted !" + "selectedPro is " + selectedPro);

}

@Override

public void onNothingSelected(AdapterView<?> parent) {

}

});

// 市选择

mCitySpinner.setOnItemSelectedListener(new OnItemSelectedListener() {

@Override

public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

selectedCity = "";

selectedCity = (String) parent.getSelectedItem();

updateArea(selectedCity);

Log.d(TAG, "mCitySpinner has excuted !" + "selectedCity is " + selectedCity);

}

@Override

public void onNothingSelected(AdapterView<?> parent) {

}

});

// 区选择

mAreaSpinner.setOnItemSelectedListener(new OnItemSelectedListener() {

@Override

public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

selectedArea = "";

selectedArea = (String) parent.getSelectedItem();

tv_address.setText("已选择: " + selectedPro + selectedCity + selectedArea);

Log.d(TAG, "mAreaSpinner has excuted !" + "selectedArea is " + selectedArea);

}

@Override

public void onNothingSelected(AdapterView<?> parent) {

}

});

}

protected void updateArea(String city) {

String[] areas = mAreaDataMap.get(city);

// 存在区

if (areas != null) {

// 存在区

mAreaSpinner.setVisibility(View.VISIBLE);

mAreaAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, areas);

mAreaAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

mAreaSpinner.setAdapter(mAreaAdapter);

mAreaAdapter.notifyDataSetChanged();

mAreaSpinner.setSelection(0);

} else {

tv_address.setText("已选择: " + selectedPro + selectedCity);

mAreaSpinner.setVisibility(View.GONE);

}

protected void updateCity(String pro) {

String[] cities = mCitiesDataMap.get(pro);

for (int i = 0; i < cities.length; i++) {

// 存在区

mCityAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, cities);

mCityAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

mCitySpinner.setAdapter(mCityAdapter);

mCityAdapter.notifyDataSetChanged();

mCitySpinner.setSelection(0);

}

// 从asset目录下读取城市json文件转化为String类型

private String InitData() {

StringBuffer sb = new StringBuffer();

AssetManager mAssetManager = this.getAssets();

try {

InputStream is = mAssetManager.open("city.json");

byte[] data = new byte[is.available()];

int len = -1;

while ((len = is.read(data)) != -1) {

sb.append(new String(data, 0, len, "gb2312"));

}

is.close();

return sb.toString();

} catch (IOException e) {

e.printStackTrace();

}

return null;

}

//开始解析城市数据

private void BeginJsonCitisData(String cityJson) {

if (!TextUtils.isEmpty(cityJson)) {

try {

JSONObject object = new JSONObject(cityJson);

JSONArray array = object.getJSONArray("citylist");

// 获取省份的数量

mProvinceDatas = new String[array.length()];

String mProvinceStr = null;

// 循环遍历

for (int i = 0; i < array.length(); i++) {

// 循环遍历省份，并将省保存在mProvinceDatas[]中

JSONObject mProvinceObject = array.getJSONObject(i);

if (mProvinceObject.has("p")) {

mProvinceStr = mProvinceObject.getString("p");

mProvinceDatas[i] = mProvinceStr;

} else {

mProvinceDatas[i] = "unknown province";

}

JSONArray cityArray;

String mCityStr = null;

try {

// 循环遍历省对应下的城市

cityArray = mProvinceObject.getJSONArray("c");

} catch (Exception e) {

e.printStackTrace();

continue;

}

mCitiesDatas = new String[cityArray.length()];

for (int j = 0; j < cityArray.length(); j++) {

// 循环遍历城市，并将城市保存在mCitiesDatas[]中

JSONObject mCityObject = cityArray.getJSONObject(j);

if (mCityObject.has("n")) {

mCityStr = mCityObject.getString("n");

mCitiesDatas[j] = mCityStr;

} else {

mCitiesDatas[j] = "unknown city";

}

// 循环遍历地区

JSONArray areaArray;

try {

// 判断是否含有第三级区域划分，若没有，则跳出本次循环，重新执行循环遍历城市

areaArray = mCityObject.getJSONArray("a");

} catch (Exception e) {

e.printStackTrace();

continue;

}

// 执行下面过程则说明存在第三级区域

mAreaDatas = new String[areaArray.length()];

for (int m = 0; m < areaArray.length(); m++) {

// 循环遍历第三级区域，并将区域保存在mAreaDatas[]中

JSONObject areaObject = areaArray.getJSONObject(m);

if (areaObject.has("s")) {

mAreaDatas[m] = areaObject.getString("s");

} else {

mAreaDatas[m] = "unknown area";

}

Log.d(TAG, mAreaDatas[m]);

}

// 存储市对应的所有第三级区域

mAreaDataMap.put(mCityStr, mAreaDatas);

}

// 存储省份对应的所有市

mCitiesDataMap.put(mProvinceStr, mCitiesDatas);

}

} catch (JSONException e) {

e.printStackTrace();

}

city.json:

ohhhhhkim

Android 省市区三级联动读取本地json

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