[置顶] Android省市区三级联动的实现

在最近的项目中要用到一个城市的选择，由于城市选择的风格是由本公司UI设计师设计的，相当于自己定义风格的城市联动选择器，本着对UI设计师设计的尊重。我自己便写了这样一个城市选择器。

大体上来说，实现的原理没有发生改变，我是将所有的城市资源放在本地数据进行操作的，只是在风格上和常规的有点变化，希望对大家，有所帮助，嘿嘿。

项目结构如下：



下面先看看效果图（界面没做优化）：



MainActivity代码如下：

package com.scl.city;

import java.util.ArrayList;

import android.app.Activity;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.graphics.Color;
import android.os.Bundle;
import android.util.Log;

import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.GridView;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener {
private TextView sheng, shi, qu;
private GridView gridview;
private DBManager dbm;
private SQLiteDatabase db;
private String province = null;// 省
private String city = null;// 市
private String district = null;// 区

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
/**
* 初始化控件
*/
sheng = (TextView) findViewById(R.id.sheng);
shi = (TextView) findViewById(R.id.shi);
qu = (TextView) findViewById(R.id.qu);
gridview = (GridView) findViewById(R.id.gridview);
sheng.setOnClickListener(this);

}

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.sheng:
sheng();
sheng.setTextColor(Color.parseColor("#FF0000"));
shi.setTextColor(Color.parseColor("#000000"));
qu.setTextColor(Color.parseColor("#000000"));
break;
}
}

/**
* 查询省
*/

public void sheng() {
// 创建数据库类对象
dbm = new DBManager(this);
// 打开本地数据库资源
dbm.openDatabase();
// 获取数据库省数据
db = dbm.getDatabase();
final ArrayList<MyListItem> list = new ArrayList<MyListItem>();

try {
String sql = "select * from province";
Cursor cursor = db.rawQuery(sql, null);
cursor.moveToFirst();
while (!cursor.isLast()) {
String code = cursor.getString(cursor.getColumnIndex("code"));
byte bytes[] = cursor.getBlob(2);
String name = new String(bytes, "gbk");
MyListItem myListItem = new MyListItem();
myListItem.setName(name);
myListItem.setPcode(code);
list.add(myListItem);
cursor.moveToNext();
}
String code = cursor.getString(cursor.getColumnIndex("code"));
byte bytes[] = cursor.getBlob(2);
String name = new String(bytes, "gbk");
MyListItem myListItem = new MyListItem();
myListItem.setName(name);
myListItem.setPcode(code);
// 将所有的省的名称和编号放入list集合中，方便在下面显示
list.add(myListItem);

} catch (Exception e) {
}
// 查询数据完毕后，关闭数据库连接
dbm.closeDatabase();
db.close();

Log.i("wujie", list.size() + "个省" + list.get(0).getName());

Adapter adapter = new Adapter(MainActivity.this, list);
// 设置GridView的适配器为新建的adapter
gridview.setAdapter(adapter);

gridview.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v,
int position, long id) {
// 点击省份后，通过点击的位置，在ArrayList中找出该省的名称和编号
String province_code = list.get(position).getPcode();
province = list.get(position).getName();
Log.i("wujie", province_code + "的" + province);
// 通过省的编号查找该省所对应的市
shi(province_code);
sheng.setTextColor(Color.parseColor("#000000"));
shi.setTextColor(Color.parseColor("#ff0000"));
}
});
}

/**
* 查询市
*
* @param pcode
*/

public void shi(String pcode) {
dbm = new DBManager(this);
dbm.openDatabase();
db = dbm.getDatabase();
final ArrayList<MyListItem> list = new ArrayList<MyListItem>();

try {
String sql = "select * from city where pcode='" + pcode + "'";
Cursor cursor = db.rawQuery(sql, null);
cursor.moveToFirst();
while (!cursor.isLast()) {
String code = cursor.getString(cursor.getColumnIndex("code"));
byte bytes[] = cursor.getBlob(2);
String name = new String(bytes, "gbk");
MyListItem myListItem = new MyListItem();
myListItem.setName(name);
myListItem.setPcode(code);
list.add(myListItem);
cursor.moveToNext();
}
String code = cursor.getString(cursor.getColumnIndex("code"));
byte bytes[] = cursor.getBlob(2);
String name = new String(bytes, "gbk");
MyListItem myListItem = new MyListItem();
myListItem.setName(name);
myListItem.setPcode(code);
list.add(myListItem);

} catch (Exception e) {
}
dbm.closeDatabase();
db.close();
Log.i("wujie", list.size() + "个市区" + list.get(0).getName());
Adapter adapter = new Adapter(MainActivity.this, list);
// 设置GridView的适配器为新建的adapter
gridview.setAdapter(adapter);

gridview.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v,
int position, long id) {
String city_code = list.get(position).getPcode();
city = list.get(position).getName();
qu(city_code);
Log.i("wujie", city_code + "的" + city);
shi.setTextColor(Color.parseColor("#000000"));
qu.setTextColor(Color.parseColor("#ff0000"));
}
});
}

/**
* 查询区，县
*
* @param pcode
*/

public void qu(String pcode) {
dbm = new DBManager(this);
dbm.openDatabase();
db = dbm.getDatabase();
final ArrayList<MyListItem> list = new ArrayList<MyListItem>();

try {
String sql = "select * from district where pcode='" + pcode + "'";
Cursor cursor = db.rawQuery(sql, null);
cursor.moveToFirst();
while (!cursor.isLast()) {
String code = cursor.getString(cursor.getColumnIndex("code"));
byte bytes[] = cursor.getBlob(2);
String name = new String(bytes, "gbk");
MyListItem myListItem = new MyListItem();
myListItem.setName(name);
myListItem.setPcode(code);
list.add(myListItem);
cursor.moveToNext();
}
String code = cursor.getString(cursor.getColumnIndex("code"));
byte bytes[] = cursor.getBlob(2);
String name = new String(bytes, "gbk");
MyListItem myListItem = new MyListItem();
myListItem.setName(name);
myListItem.setPcode(code);
list.add(myListItem);

} catch (Exception e) {
}
dbm.closeDatabase();
db.close();

Adapter adapter = new Adapter(MainActivity.this, list);
// 设置GridView的适配器为新建的simpleAdapter
gridview.setAdapter(adapter);

gridview.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v,
int position, long id) {
String district_code = list.get(position).getPcode();
district = list.get(position).getName();
Log.i("wujie", district_code + "的" + district);
Toast.makeText(MainActivity.this, province + city + district, 1)
.show();
}
});
}
}

2.实体类MyListItem：

package com.scl.city;

public class MyListItem {
private String name;//省,市，区名称
private String pcode;//对应编号
public String getName(){
return name;
}
public String getPcode(){
return pcode;
}
public void setName(String name){
this.name=name;
}
public void setPcode(String pcode){
this.pcode=pcode;
}
}

3.数据库管理类DBManager

package com.scl.city;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.os.Environment;
import android.util.Log;

public class DBManager {
private final int BUFFER_SIZE = 1024;
public static final String DB_NAME = "city_cn.s3db";
public static final String PACKAGE_NAME = "com.scl.city";
public static final String DB_PATH = "/data"
+ Environment.getDataDirectory().getAbsolutePath() + "/"+ PACKAGE_NAME;
private SQLiteDatabase database;
private Context context;
private File file=null;

DBManager(Context context) {
Log.e("scl", "DBManager");
this.context = context;
}

public void openDatabase() {
Log.e("scl", "openDatabase()");
this.database = this.openDatabase(DB_PATH + "/" + DB_NAME);
}
public SQLiteDatabase getDatabase(){
Log.e("scl", "getDatabase()");
return this.database;
}

private SQLiteDatabase openDatabase(String dbfile) {
try {
Log.e("scl", "open and return");
file = new File(dbfile);
if (!file.exists()) {
Log.e("scl", "file");
InputStream is = context.getResources().openRawResource(R.raw.city);
if(is!=null){
Log.e("scl", "is null");
}else{
}
FileOutputStream fos = new FileOutputStream(dbfile);
if(is!=null){
Log.e("scl", "fosnull");
}else{
}
byte[] buffer = new byte[BUFFER_SIZE];
int count = 0;
while ((count =is.read(buffer)) > 0) {
fos.write(buffer, 0, count);
Log.e("scl", "while");
fos.flush();
}
fos.close();
is.close();
}
database = SQLiteDatabase.openOrCreateDatabase(dbfile,null);
return database;
} catch (FileNotFoundException e) {
Log.e("scl", "File not found");
e.printStackTrace();
} catch (IOException e) {
Log.e("scl", "IO exception");
e.printStackTrace();
} catch (Exception e){
Log.e("scl", "exception "+e.toString());
}
return null;
}
public void closeDatabase() {
Log.e("scl", "closeDatabase()");
if(this.database!=null)
this.database.close();
}
}

4.城市列表适配器Adapter

package com.scl.city;

import java.util.ArrayList;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

public class Adapter extends BaseAdapter{

LayoutInflater inflater = null;
ArrayList<MyListItem> listInfo;
public Adapter(Context context,ArrayList<MyListItem> listInfo){
inflater = LayoutInflater.from(context);
//this.inflater = inflater;
this.listInfo = listInfo;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return listInfo.size();
}
@Override
public Object getItem(int index) {
// TODO Auto-generated method stub
return listInfo.get(index);
}
@Override
public long getItemId(int index) {
// TODO Auto-generated method stub
return index;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
ViewHolder holder;
if(convertView == null || convertView.getTag() == null){
convertView = inflater.inflate(R.layout.item,null);
holder = new ViewHolder();

holder.textView = (TextView)convertView.findViewById(R.id.textview);
convertView.setTag(holder);
}else{

holder = (ViewHolder)convertView.getTag();
}
MyListItem appInfo = listInfo.get(position);
holder.textView.setText(appInfo.getName());
return convertView;
}
public class ViewHolder{
TextView textView;
}

}

下面就是布局

主布局main_activity

<RelativeLayout
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:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.scl.city.MainActivity" >
<RelativeLayout
android:id="@+id/rl"
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
<TextView
android:id="@+id/sheng"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="省"
android:layout_alignParentLeft="true"/>

<TextView
android:id="@+id/shi"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="市"
android:layout_centerHorizontal="true"/>
<TextView
android:id="@+id/qu"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="区"
android:layout_alignParentRight="true"/>
</RelativeLayout>
<GridView
android:layout_below="@id/rl"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/gridview"
android:numColumns="4"
></GridView>
</RelativeLayout>

Gridview的子布局ietm

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/textview"
android:text="123"/>

</LinearLayout>

最后，大家别忘了还有省，市，区 的资源文件，该资源文件放在项目中的res中创建的raw包下面。

源码下载下载地址