在上两篇文章中，我们依次介绍openfire部署以及smack常用API的使用，这一节中我们着力介绍如何基于asmack开发一个Android的客户端，本篇的重点在实践，讲解和原理环节，大家可以参考前两篇的文章
1.源码结构介绍
![Android之基于xmpp openfire smack开发之Android客户端开发[3]_ide](https://s2.51cto.com/images/blog/202108/12/2240f0e1205a9574be542953737f719e.jpeg?x-oss-process=image/watermark,size_16,text_QDUxQ1RP5Y2a5a6i,color_FFFFFF,t_30,g_se,x_10,y_10,shadow_20,type_ZmFuZ3poZW5naGVpdGk=/resize,m_fixed,w_1184)
activity包下存放一些android页面交互相关的控制程序，还有一个些公共帮助类
db包为sqlite的工具类封装，这里做了一些自定义的改造，稍微仿Spring的JdbcTemplate结构，使用起来更加方便一点
manager包留下主要是一些管理组件，包括联系人管理，消息管理，提醒管理，离线消息管理，用户管理，xmpp连接管理
model包中都是一些对象模型，传输介质
service中存放一些android后台的核心服务，主要包括聊天服务，联系人服务，系统消息服务，重连接服务
task包中存放一些耗时的异步操作
util中存放一些常用的工具类
view中一些和android的UI相关的显示控件
![Android之基于xmpp openfire smack开发之Android客户端开发[3]_smack_02](https://s2.51cto.com/images/blog/202108/12/ccc23c45fa157eeaa6a2b59ef48528f4.jpeg?x-oss-process=image/watermark,size_16,text_QDUxQ1RP5Y2a5a6i,color_FFFFFF,t_30,g_se,x_10,y_10,shadow_20,type_ZmFuZ3poZW5naGVpdGk=/resize,m_fixed,w_1184)
anim中存放一些动画元素的配置
layout是布局页面
menu是地步菜单布局页面
values中存放一些字符，颜色，样式，参数的配置信息
其中strings.xml中，保存的缺省配置为gtalk的服务器信息，大家如果有谷歌gtalk的账号可以直接登录，否则需要更改这里的配置才可以使用其他的xmpp服务器
<!-- 缺省的服务器配置 -->
<integer name="xmpp_port">5222</integer>
<string name="xmpp_host">talk.google.com</string>
<string name="xmpp_service_name">gmail.com</string>
<bool name="is_remember">true</bool>
<bool name="is_autologin">false</bool>
<bool name="is_novisible">false</bool> AndroidManifest.xml为android功能清单的配置文件，我们这里开放的权限并不多
<!-- 访问Internet -->
<uses-permission android:name="android.permission.INTERNET" />
<!--- 访问网络状态 -->
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<!-- 往SDCard写入数据权限 -->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<span style="WHITE-SPACE: pre"> </span><!-- 在SDCard中创建与删除文件权限 -->
<span style="WHITE-SPACE: pre"> </span><uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
<span style="WHITE-SPACE: pre"> </span><!-- 往SDCard写入数据权限 -->
<span style="WHITE-SPACE: pre"> </span><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
2.核心类介绍
1.ActivitySupport类
package csdn.shimiso.eim.activity;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.location.LocationManager;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.os.Environment;
import android.provider.Settings;
import android.view.inputmethod.InputMethodManager;
import android.widget.Toast;
import csdn.shimiso.eim.R;
import csdn.shimiso.eim.comm.Constant;
import csdn.shimiso.eim.model.LoginConfig;
import csdn.shimiso.eim.service.IMChatService;
import csdn.shimiso.eim.service.IMContactService;
import csdn.shimiso.eim.service.IMSystemMsgService;
import csdn.shimiso.eim.service.ReConnectService;
/**
* Actity 工具支持类
*
* @author shimiso
*
*/
public class ActivitySupport extends Activity implements IActivitySupport {
protected Context context = null;
protected SharedPreferences preferences;
protected EimApplication eimApplication;
protected ProgressDialog pg = null;
protected NotificationManager notificationManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
context = this;
preferences = getSharedPreferences(Constant.LOGIN_SET, 0);
notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
pg = new ProgressDialog(context);
eimApplication = (EimApplication) getApplication();
eimApplication.addActivity(this);
}
@Override
protected void onStart() {
super.onStart();
}
@Override
protected void onResume() {
super.onResume();
}
@Override
protected void onPause() {
super.onPause();
}
@Override
protected void onStop() {
super.onStop();
}
@Override
public void onDestroy() {
super.onDestroy();
}
@Override
public ProgressDialog getProgressDialog() {
return pg;
}
@Override
public void startService() {
// 好友联系人服务
Intent server = new Intent(context, IMContactService.class);
context.startService(server);
// 聊天服务
Intent chatServer = new Intent(context, IMChatService.class);
context.startService(chatServer);
// 自动恢复连接服务
Intent reConnectService = new Intent(context, ReConnectService.class);
context.startService(reConnectService);
// 系统消息连接服务
Intent imSystemMsgService = new Intent(context,
IMSystemMsgService.class);
context.startService(imSystemMsgService);
}
/**
*
* 销毁服务.
*
* @author shimiso
* @update 2012-5-16 下午12:16:08
*/
@Override
public void stopService() {
// 好友联系人服务
Intent server = new Intent(context, IMContactService.class);
context.stopService(server);
// 聊天服务
Intent chatServer = new Intent(context, IMChatService.class);
context.stopService(chatServer);
// 自动恢复连接服务
Intent reConnectService = new Intent(context, ReConnectService.class);
context.stopService(reConnectService);
// 系统消息连接服务
Intent imSystemMsgService = new Intent(context,
IMSystemMsgService.class);
context.stopService(imSystemMsgService);
}
@Override
public void isExit() {
new AlertDialog.Builder(context).setTitle("确定退出吗?")
.setNeutralButton("确定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
stopService();
eimApplication.exit();
}
})
.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
}).show();
}
@Override
public boolean hasInternetConnected() {
ConnectivityManager manager = (ConnectivityManager) context
.getSystemService(context.CONNECTIVITY_SERVICE);
if (manager != null) {
NetworkInfo network = manager.getActiveNetworkInfo();
if (network != null && network.isConnectedOrConnecting()) {
return true;
}
}
return false;
}
@Override
public boolean validateInternet() {
ConnectivityManager manager = (ConnectivityManager) context
.getSystemService(context.CONNECTIVITY_SERVICE);
if (manager == null) {
openWirelessSet();
return false;
} else {
NetworkInfo[] info = manager.getAllNetworkInfo();
if (info != null) {
for (int i = 0; i < info.length; i++) {
if (info[i].getState() == NetworkInfo.State.CONNECTED) {
return true;
}
}
}
}
openWirelessSet();
return false;
}
@Override
public boolean hasLocationGPS() {
LocationManager manager = (LocationManager) context
.getSystemService(context.LOCATION_SERVICE);
if (manager
.isProviderEnabled(android.location.LocationManager.GPS_PROVIDER)) {
return true;
} else {
return false;
}
}
@Override
public boolean hasLocationNetWork() {
LocationManager manager = (LocationManager) context
.getSystemService(context.LOCATION_SERVICE);
if (manager
.isProviderEnabled(android.location.LocationManager.NETWORK_PROVIDER)) {
return true;
} else {
return false;
}
}
@Override
public void checkMemoryCard() {
if (!Environment.MEDIA_MOUNTED.equals(Environment
.getExternalStorageState())) {
new AlertDialog.Builder(context)
.setTitle(R.string.prompt)
.setMessage("请检查内存卡")
.setPositiveButton(R.string.menu_settings,
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
dialog.cancel();
Intent intent = new Intent(
Settings.ACTION_SETTINGS);
context.startActivity(intent);
}
})
.setNegativeButton("退出",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
dialog.cancel();
eimApplication.exit();
}
}).create().show();
}
}
public void openWirelessSet() {
AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(context);
dialogBuilder
.setTitle(R.string.prompt)
.setMessage(context.getString(R.string.check_connection))
.setPositiveButton(R.string.menu_settings,
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
dialog.cancel();
Intent intent = new Intent(
Settings.ACTION_WIRELESS_SETTINGS);
context.startActivity(intent);
}
})
.setNegativeButton(R.string.close,
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int whichButton) {
dialog.cancel();
}
});
dialogBuilder.show();
}
/**
*
* 显示toast
*
* @param text
* @param longint
* @author shimiso
* @update 2012-6-28 下午3:46:18
*/
public void showToast(String text, int longint) {
Toast.makeText(context, text, longint).show();
}
@Override
public void showToast(String text) {
Toast.makeText(context, text, Toast.LENGTH_SHORT).show();
}
/**
*
* 关闭键盘事件
*
* @author shimiso
* @update 2012-7-4 下午2:34:34
*/
public void closeInput() {
InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
if (inputMethodManager != null && this.getCurrentFocus() != null) {
inputMethodManager.hideSoftInputFromWindow(this.getCurrentFocus()
.getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
}
}
/**
*
* 发出Notification的method.
*
* @param iconId
* 图标
* @param contentTitle
* 标题
* @param contentText
* 你内容
* @param activity
* @author shimiso
* @update 2012-5-14 下午12:01:55
*/
public void setNotiType(int iconId, String contentTitle,
String contentText, Class activity, String from) {
/*
* 创建新的Intent，作为点击Notification留言条时， 会运行的Activity
*/
Intent notifyIntent = new Intent(this, activity);
notifyIntent.putExtra("to", from);
// notifyIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
/* 创建PendingIntent作为设置递延运行的Activity */
PendingIntent appIntent = PendingIntent.getActivity(this, 0,
notifyIntent, 0);
/* 创建Notication，并设置相关参数 */
Notification myNoti = new Notification();
// 点击自动消失
myNoti.flags = Notification.FLAG_AUTO_CANCEL;
/* 设置statusbar显示的icon */
myNoti.icon = iconId;
/* 设置statusbar显示的文字信息 */
myNoti.tickerText = contentTitle;
/* 设置notification发生时同时发出默认声音 */
myNoti.defaults = Notification.DEFAULT_SOUND;
/* 设置Notification留言条的参数 */
myNoti.setLatestEventInfo(this, contentTitle, contentText, appIntent);
/* 送出Notification */
notificationManager.notify(0, myNoti);
}
@Override
public Context getContext() {
return context;
}
@Override
public SharedPreferences getLoginUserSharedPre() {
return preferences;
}
@Override
public void saveLoginConfig(LoginConfig loginConfig) {
preferences.edit()
.putString(Constant.XMPP_HOST, loginConfig.getXmppHost())
.commit();
preferences.edit()
.putInt(Constant.XMPP_PORT, loginConfig.getXmppPort()).commit();
preferences
.edit()
.putString(Constant.XMPP_SEIVICE_NAME,
loginConfig.getXmppServiceName()).commit();
preferences.edit()
.putString(Constant.USERNAME, loginConfig.getUsername())
.commit();
preferences.edit()
.putString(Constant.PASSWORD, loginConfig.getPassword())
.commit();
preferences.edit()
.putBoolean(Constant.IS_AUTOLOGIN, loginConfig.isAutoLogin())
.commit();
preferences.edit()
.putBoolean(Constant.IS_NOVISIBLE, loginConfig.isNovisible())
.commit();
preferences.edit()
.putBoolean(Constant.IS_REMEMBER, loginConfig.isRemember())
.commit();
preferences.edit()
.putBoolean(Constant.IS_ONLINE, loginConfig.isOnline())
.commit();
preferences.edit()
.putBoolean(Constant.IS_FIRSTSTART, loginConfig.isFirstStart())
.commit();
}
@Override
public LoginConfig getLoginConfig() {
LoginConfig loginConfig = new LoginConfig();
String a = preferences.getString(Constant.XMPP_HOST, null);
String b = getResources().getString(R.string.xmpp_host);
loginConfig.setXmppHost(preferences.getString(Constant.XMPP_HOST,
getResources().getString(R.string.xmpp_host)));
loginConfig.setXmppPort(preferences.getInt(Constant.XMPP_PORT,
getResources().getInteger(R.integer.xmpp_port)));
loginConfig.setUsername(preferences.getString(Constant.USERNAME, null));
loginConfig.setPassword(preferences.getString(Constant.PASSWORD, null));
loginConfig.setXmppServiceName(preferences.getString(
Constant.XMPP_SEIVICE_NAME,
getResources().getString(R.string.xmpp_service_name)));
loginConfig.setAutoLogin(preferences.getBoolean(Constant.IS_AUTOLOGIN,
getResources().getBoolean(R.bool.is_autologin)));
loginConfig.setNovisible(preferences.getBoolean(Constant.IS_NOVISIBLE,
getResources().getBoolean(R.bool.is_novisible)));
loginConfig.setRemember(preferences.getBoolean(Constant.IS_REMEMBER,
getResources().getBoolean(R.bool.is_remember)));
loginConfig.setFirstStart(preferences.getBoolean(
Constant.IS_FIRSTSTART, true));
return loginConfig;
}
@Override
public boolean getUserOnlineState() {
// preferences = getSharedPreferences(Constant.LOGIN_SET,0);
return preferences.getBoolean(Constant.IS_ONLINE, true);
}
@Override
public void setUserOnlineState(boolean isOnline) {
// preferences = getSharedPreferences(Constant.LOGIN_SET,0);
preferences.edit().putBoolean(Constant.IS_ONLINE, isOnline).commit();
}
@Override
public EimApplication getEimApplication() {
return eimApplication;
}
} 大家写android程序会发现，不同的activity之间经常需要调用一些公共的资源，这里的资源不仅包括android自身的，还有我们自己的管理服务类，甚至相互之间传递一些参数，这里我仿照struts2的设计，提炼出一个ActivitySupport类，同时抽取一个接口，让所有的Activity都集成这个类，因为有了接口，我们便可以采用回调模式，非常方便的传递数据和使用公共的资源，这种好处相信大家使用之后都能有深刻的体会，通过接口回调传递参数和相互调用的方式无疑是最优雅的，spring和hibernate源码中曾经大量使用这种结构。
2.SQLiteTemplate类
package csdn.shimiso.eim.db;
import java.util.ArrayList;
import java.util.List;
import android.content.ContentValues;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
/**
* SQLite数据库模板工具类
*
* 该类提供了数据库操作常用的增删改查,以及各种复杂条件匹配,分页,排序等操作
*
* @see SQLiteDatabase
*/
public class SQLiteTemplate {
/**
* Default Primary key
*/
protected String mPrimaryKey = "_id";
/**
* DBManager
*/
private DBManager dBManager;
/**
* 是否为一个事务
*/
private boolean isTransaction = false;
/**
* 数据库连接
*/
private SQLiteDatabase dataBase = null;
private SQLiteTemplate() {
}
private SQLiteTemplate(DBManager dBManager, boolean isTransaction) {
this.dBManager = dBManager;
this.isTransaction = isTransaction;
}
/**
* isTransaction 是否属于一个事务 注:一旦isTransaction设为true
* 所有的SQLiteTemplate方法都不会自动关闭资源,需在事务成功后手动关闭
*
* @return
*/
public static SQLiteTemplate getInstance(DBManager dBManager,
boolean isTransaction) {
return new SQLiteTemplate(dBManager, isTransaction);
}
/**
* 执行一条sql语句
*
* @param name
* @param tel
*/
public void execSQL(String sql) {
try {
dataBase = dBManager.openDatabase();
dataBase.execSQL(sql);
} catch (Exception e) {
e.printStackTrace();
} finally {
if (!isTransaction) {
closeDatabase(null);
}
}
}
/**
* 执行一条sql语句
*
* @param name
* @param tel
*/
public void execSQL(String sql, Object[] bindArgs) {
try {
dataBase = dBManager.openDatabase();
dataBase.execSQL(sql, bindArgs);
} catch (Exception e) {
e.printStackTrace();
} finally {
if (!isTransaction) {
closeDatabase(null);
}
}
}
/**
* 向数据库表中插入一条数据
*
* @param table
* 表名
* @param content
* 字段值
*/
public long insert(String table, ContentValues content) {
try {
dataBase = dBManager.openDatabase();
// insert方法第一参数：数据库表名，第二个参数如果CONTENT为空时则向表中插入一个NULL,第三个参数为插入的内容
return dataBase.insert(table, null, content);
} catch (Exception e) {
e.printStackTrace();
} finally {
if (!isTransaction) {
closeDatabase(null);
}
}
return 0;
}
/**
* 批量删除指定主键数据
*
* @param ids
*/
public void deleteByIds(String table, Object... primaryKeys) {
try {
if (primaryKeys.length > 0) {
StringBuilder sb = new StringBuilder();
for (@SuppressWarnings("unused")
Object id : primaryKeys) {
sb.append("?").append(",");
}
sb.deleteCharAt(sb.length() - 1);
dataBase = dBManager.openDatabase();
dataBase.execSQL("delete from " + table + " where "
+ mPrimaryKey + " in(" + sb + ")",
(Object[]) primaryKeys);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (!isTransaction) {
closeDatabase(null);
}
}
}
/**
* 根据某一个字段和值删除一行数据, 如 name="jack"
*
* @param table
* @param field
* @param value
* @return 返回值大于0表示删除成功
*/
public int deleteByField(String table, String field, String value) {
try {
dataBase = dBManager.openDatabase();
return dataBase.delete(table, field + "=?", new String[] { value });
} catch (Exception e) {
e.printStackTrace();
} finally {
if (!isTransaction) {
closeDatabase(null);
}
}
return 0;
}
/**
* 根据条件删除数据
*
* @param table
* 表名
* @param whereClause
* 查询语句 参数采用?
* @param whereArgs
* 参数值
* @return 返回值大于0表示删除成功
*/
public int deleteByCondition(String table, String whereClause,
String[] whereArgs) {
try {
dataBase = dBManager.openDatabase();
return dataBase.delete(table, whereClause, whereArgs);
} catch (Exception e) {
e.printStackTrace();
} finally {
if (!isTransaction) {
closeDatabase(null);
}
}
return 0;
}
/**
* 根据主键删除一行数据
*
* @param table
* @param id
* @return 返回值大于0表示删除成功
*/
public int deleteById(String table, String id) {
try {
dataBase = dBManager.openDatabase();
return deleteByField(table, mPrimaryKey, id);
} catch (Exception e) {
e.printStackTrace();
} finally {
if (!isTransaction) {
closeDatabase(null);
}
}
return 0;
}
/**
* 根据主键更新一行数据
*
* @param table
* @param id
* @param values
* @return 返回值大于0表示更新成功
*/
public int updateById(String table, String id, ContentValues values) {
try {
dataBase = dBManager.openDatabase();
return dataBase.update(table, values, mPrimaryKey + "=?",
new String[] { id });
} catch (Exception e) {
e.printStackTrace();
} finally {
if (!isTransaction) {
closeDatabase(null);
}
}
return 0;
}
/**
* 更新数据
*
* @param table
* @param values
* @param whereClause
* @param whereArgs
* @return 返回值大于0表示更新成功
*/
public int update(String table, ContentValues values, String whereClause,
String[] whereArgs) {
try {
dataBase = dBManager.openDatabase();
return dataBase.update(table, values, whereClause, whereArgs);
} catch (Exception e) {
e.printStackTrace();
} finally {
if (!isTransaction) {
closeDatabase(null);
}
}
return 0;
}
/**
* 根据主键查看某条数据是否存在
*
* @param table
* @param id
* @return
*/
public Boolean isExistsById(String table, String id) {
try {
dataBase = dBManager.openDatabase();
return isExistsByField(table, mPrimaryKey, id);
} catch (Exception e) {
e.printStackTrace();
} finally {
if (!isTransaction) {
closeDatabase(null);
}
}
return null;
}
/**
* 根据某字段/值查看某条数据是否存在
*
* @param status
* @return
*/
public Boolean isExistsByField(String table, String field, String value) {
StringBuilder sql = new StringBuilder();
sql.append("SELECT COUNT(*) FROM ").append(table).append(" WHERE ")
.append(field).append(" =?");
try {
dataBase = dBManager.openDatabase();
return isExistsBySQL(sql.toString(), new String[] { value });
} catch (Exception e) {
e.printStackTrace();
} finally {
if (!isTransaction) {
closeDatabase(null);
}
}
return null;
}
/**
* 使用SQL语句查看某条数据是否存在
*
* @param sql
* @param selectionArgs
* @return
*/
public Boolean isExistsBySQL(String sql, String[] selectionArgs) {
Cursor cursor = null;
try {
dataBase = dBManager.openDatabase();
cursor = dataBase.rawQuery(sql, selectionArgs);
if (cursor.moveToFirst()) {
return (cursor.getInt(0) > 0);
} else {
return false;
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (!isTransaction) {
closeDatabase(cursor);
}
}
return null;
}
/**
* 查询一条数据
*
* @param rowMapper
* @param sql
* @param args
* @return
*/
public <T> T queryForObject(RowMapper<T> rowMapper, String sql,
String[] args) {
Cursor cursor = null;
T object = null;
try {
dataBase = dBManager.openDatabase();
cursor = dataBase.rawQuery(sql, args);
if (cursor.moveToFirst()) {
object = rowMapper.mapRow(cursor, cursor.getCount());
}
} finally {
if (!isTransaction) {
closeDatabase(cursor);
}
}
return object;
}
/**
* 查询
*
* @param rowMapper
* @param sql
* @param startResult
* 开始索引 注:第一条记录索引为0
* @param maxResult
* 步长
* @return
*/
public <T> List<T> queryForList(RowMapper<T> rowMapper, String sql,
String[] selectionArgs) {
Cursor cursor = null;
List<T> list = null;
try {
dataBase = dBManager.openDatabase();
cursor = dataBase.rawQuery(sql, selectionArgs);
list = new ArrayList<T>();
while (cursor.moveToNext()) {
list.add(rowMapper.mapRow(cursor, cursor.getPosition()));
}
} finally {
if (!isTransaction) {
closeDatabase(cursor);
}
}
return list;
}
/**
* 分页查询
*
* @param rowMapper
* @param sql
* @param startResult
* 开始索引 注:第一条记录索引为0
* @param maxResult
* 步长
* @return
*/
public <T> List<T> queryForList(RowMapper<T> rowMapper, String sql,
int startResult, int maxResult) {
Cursor cursor = null;
List<T> list = null;
try {
dataBase = dBManager.openDatabase();
cursor = dataBase.rawQuery(sql + " limit ?,?", new String[] {
String.valueOf(startResult), String.valueOf(maxResult) });
list = new ArrayList<T>();
while (cursor.moveToNext()) {
list.add(rowMapper.mapRow(cursor, cursor.getPosition()));
}
} finally {
if (!isTransaction) {
closeDatabase(cursor);
}
}
return list;
}
/**
* 获取记录数
*
* @return
*/
public Integer getCount(String sql, String[] args) {
Cursor cursor = null;
try {
dataBase = dBManager.openDatabase();
cursor = dataBase.rawQuery("select count(*) from (" + sql + ")",
args);
if (cursor.moveToNext()) {
return cursor.getInt(0);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (!isTransaction) {
closeDatabase(cursor);
}
}
return 0;
}
/**
* 分页查询
*
* @param rowMapper
* @param table
* 检索的表
* @param columns
* 由需要返回列的列名所组成的字符串数组，传入null会返回所有的列。
* @param selection
* 查询条件子句，相当于select语句where关键字后面的部分，在条件子句允许使用占位符"?"
* @param selectionArgs
* 对应于selection语句中占位符的值，值在数组中的位置与占位符在语句中的位置必须一致，否则就会有异常
* @param groupBy
* 对结果集进行分组的group by语句（不包括GROUP BY关键字）。传入null将不对结果集进行分组
* @param having
* 对查询后的结果集进行过滤,传入null则不过滤
* @param orderBy
* 对结果集进行排序的order by语句（不包括ORDER BY关键字）。传入null将对结果集使用默认的排序
* @param limit
* 指定偏移量和获取的记录数，相当于select语句limit关键字后面的部分,如果为null则返回所有行
* @return
*/
public <T> List<T> queryForList(RowMapper<T> rowMapper, String table,
String[] columns, String selection, String[] selectionArgs,
String groupBy, String having, String orderBy, String limit) {
List<T> list = null;
Cursor cursor = null;
try {
dataBase = dBManager.openDatabase();
cursor = dataBase.query(table, columns, selection, selectionArgs,
groupBy, having, orderBy, limit);
list = new ArrayList<T>();
while (cursor.moveToNext()) {
list.add(rowMapper.mapRow(cursor, cursor.getPosition()));
}
} finally {
if (!isTransaction) {
closeDatabase(cursor);
}
}
return list;
}
/**
* Get Primary Key
*
* @return
*/
public String getPrimaryKey() {
return mPrimaryKey;
}
/**
* Set Primary Key
*
* @param primaryKey
*/
public void setPrimaryKey(String primaryKey) {
this.mPrimaryKey = primaryKey;
}
/**
*
* @author shimiso
*
* @param <T>
*/
public interface RowMapper<T> {
/**
*
* @param cursor
* 游标
* @param index
* 下标索引
* @return
*/
public T mapRow(Cursor cursor, int index);
}
/**
* 关闭数据库
*/
public void closeDatabase(Cursor cursor) {
if (null != dataBase) {
dataBase.close();
}
if (null != cursor) {
cursor.close();
}
}
} 我们希望在android操作数据库是优雅的一种方式，这里不必关注事务，也不用担心分页，更不用为了封装传递对象烦恼，总之一切就像面向对象那样，简单，模板类的出现正是解决这个问题，虽然它看上去可能不是那么完美有待提高，这里我封装了很多sqlite常用的工具，大家可以借鉴使用。
3.XmppConnectionManager管理类
package csdn.shimiso.eim.manager;
import org.jivesoftware.smack.Connection;
import org.jivesoftware.smack.ConnectionConfiguration;
import org.jivesoftware.smack.Roster;
import org.jivesoftware.smack.XMPPConnection;
import org.jivesoftware.smack.provider.ProviderManager;
import org.jivesoftware.smackx.GroupChatInvitation;
import org.jivesoftware.smackx.PrivateDataManager;
import org.jivesoftware.smackx.packet.ChatStateExtension;
import org.jivesoftware.smackx.packet.LastActivity;
import org.jivesoftware.smackx.packet.OfflineMessageInfo;
import org.jivesoftware.smackx.packet.OfflineMessageRequest;
import org.jivesoftware.smackx.packet.SharedGroupsInfo;
import org.jivesoftware.smackx.provider.DataFormProvider;
import org.jivesoftware.smackx.provider.DelayInformationProvider;
import org.jivesoftware.smackx.provider.DiscoverInfoProvider;
import org.jivesoftware.smackx.provider.DiscoverItemsProvider;
import org.jivesoftware.smackx.provider.MUCAdminProvider;
import org.jivesoftware.smackx.provider.MUCOwnerProvider;
import org.jivesoftware.smackx.provider.MUCUserProvider;
import org.jivesoftware.smackx.provider.MessageEventProvider;
import org.jivesoftware.smackx.provider.MultipleAddressesProvider;
import org.jivesoftware.smackx.provider.RosterExchangeProvider;
import org.jivesoftware.smackx.provider.StreamInitiationProvider;
import org.jivesoftware.smackx.provider.VCardProvider;
import org.jivesoftware.smackx.provider.XHTMLExtensionProvider;
import org.jivesoftware.smackx.search.UserSearch;
import csdn.shimiso.eim.model.LoginConfig;
/**
*
* XMPP服务器连接工具类.
*
* @author shimiso
*/
public class XmppConnectionManager {
private XMPPConnection connection;
private static ConnectionConfiguration connectionConfig;
private static XmppConnectionManager xmppConnectionManager;
private XmppConnectionManager() {
}
public static XmppConnectionManager getInstance() {
if (xmppConnectionManager == null) {
xmppConnectionManager = new XmppConnectionManager();
}
return xmppConnectionManager;
}
// init
public XMPPConnection init(LoginConfig loginConfig) {
Connection.DEBUG_ENABLED = false;
ProviderManager pm = ProviderManager.getInstance();
configure(pm);
connectionConfig = new ConnectionConfiguration(
loginConfig.getXmppHost(), loginConfig.getXmppPort(),
loginConfig.getXmppServiceName());
connectionConfig.setSASLAuthenticationEnabled(false);// 不使用SASL验证，设置为false
connectionConfig
.setSecurityMode(ConnectionConfiguration.SecurityMode.enabled);
// 允许自动连接
connectionConfig.setReconnectionAllowed(false);
// 允许登陆成功后更新在线状态
connectionConfig.setSendPresence(true);
// 收到好友邀请后manual表示需要经过同意,accept_all表示不经同意自动为好友
Roster.setDefaultSubscriptionMode(Roster.SubscriptionMode.manual);
connection = new XMPPConnection(connectionConfig);
return connection;
}
/**
*
* 返回一个有效的xmpp连接,如果无效则返回空.
*
* @return
* @author shimiso
* @update 2012-7-4 下午6:54:31
*/
public XMPPConnection getConnection() {
if (connection == null) {
throw new RuntimeException("请先初始化XMPPConnection连接");
}
return connection;
}
/**
*
* 销毁xmpp连接.
*
* @author shimiso
* @update 2012-7-4 下午6:55:03
*/
public void disconnect() {
if (connection != null) {
connection.disconnect();
}
}
public void configure(ProviderManager pm) {
// Private Data Storage
pm.addIQProvider("query", "jabber:iq:private",
new PrivateDataManager.PrivateDataIQProvider());
// Time
try {
pm.addIQProvider("query", "jabber:iq:time",
Class.forName("org.jivesoftware.smackx.packet.Time"));
} catch (ClassNotFoundException e) {
}
// XHTML
pm.addExtensionProvider("html", "http://jabber.org/protocol/xhtml-im",
new XHTMLExtensionProvider());
// Roster Exchange
pm.addExtensionProvider("x", "jabber:x:roster",
new RosterExchangeProvider());
// Message Events
pm.addExtensionProvider("x", "jabber:x:event",
new MessageEventProvider());
// Chat State
pm.addExtensionProvider("active",
"http://jabber.org/protocol/chatstates",
new ChatStateExtension.Provider());
pm.addExtensionProvider("composing",
"http://jabber.org/protocol/chatstates",
new ChatStateExtension.Provider());
pm.addExtensionProvider("paused",
"http://jabber.org/protocol/chatstates",
new ChatStateExtension.Provider());
pm.addExtensionProvider("inactive",
"http://jabber.org/protocol/chatstates",
new ChatStateExtension.Provider());
pm.addExtensionProvider("gone",
"http://jabber.org/protocol/chatstates",
new ChatStateExtension.Provider());
// FileTransfer
pm.addIQProvider("si", "http://jabber.org/protocol/si",
new StreamInitiationProvider());
// Group Chat Invitations
pm.addExtensionProvider("x", "jabber:x:conference",
new GroupChatInvitation.Provider());
// Service Discovery # Items
pm.addIQProvider("query", "http://jabber.org/protocol/disco#items",
new DiscoverItemsProvider());
// Service Discovery # Info
pm.addIQProvider("query", "http://jabber.org/protocol/disco#info",
new DiscoverInfoProvider());
// Data Forms
pm.addExtensionProvider("x", "jabber:x:data", new DataFormProvider());
// MUC User
pm.addExtensionProvider("x", "http://jabber.org/protocol/muc#user",
new MUCUserProvider());
// MUC Admin
pm.addIQProvider("query", "http://jabber.org/protocol/muc#admin",
new MUCAdminProvider());
// MUC Owner
pm.addIQProvider("query", "http://jabber.org/protocol/muc#owner",
new MUCOwnerProvider());
// Delayed Delivery
pm.addExtensionProvider("x", "jabber:x:delay",
new DelayInformationProvider());
// Version
try {
pm.addIQProvider("query", "jabber:iq:version",
Class.forName("org.jivesoftware.smackx.packet.Version"));
} catch (ClassNotFoundException e) {
}
// VCard
pm.addIQProvider("vCard", "vcard-temp", new VCardProvider());
// Offline Message Requests
pm.addIQProvider("offline", "http://jabber.org/protocol/offline",
new OfflineMessageRequest.Provider());
// Offline Message Indicator
pm.addExtensionProvider("offline",
"http://jabber.org/protocol/offline",
new OfflineMessageInfo.Provider());
// Last Activity
pm.addIQProvider("query", "jabber:iq:last", new LastActivity.Provider());
// User Search
pm.addIQProvider("query", "jabber:iq:search", new UserSearch.Provider());
// SharedGroupsInfo
pm.addIQProvider("sharedgroup",
"http://www.jivesoftware.org/protocol/sharedgroup",
new SharedGroupsInfo.Provider());
// JEP-33: Extended Stanza Addressing
pm.addExtensionProvider("addresses",
"http://jabber.org/protocol/address",
new MultipleAddressesProvider());
}
} 这个类是xmpp连接的管理类，如果大家使用smack的api对这个应该不会陌生，asmack对xmpp连接的管理，与smack的差别不大，但是部分细微区别也有，我们在使用中如果遇到问题，还要多加注意，我们这里将其设计成单例，毕竟重复创建连接是个非常消耗的过程。
![Android之基于xmpp openfire smack开发之Android客户端开发[3]_openfire_03](https://s2.51cto.com/images/blog/202108/12/8bf25fd66fcb23271b88fa556d545a79.png?x-oss-process=image/watermark,size_16,text_QDUxQ1RP5Y2a5a6i,color_FFFFFF,t_30,g_se,x_10,y_10,shadow_20,type_ZmFuZ3poZW5naGVpdGk=/resize,m_fixed,w_1184)
![Android之基于xmpp openfire smack开发之Android客户端开发[3]_ide_04](https://s2.51cto.com/images/blog/202108/12/3334e7ce3c37cfa83f2c0917bd67bc34.png?x-oss-process=image/watermark,size_16,text_QDUxQ1RP5Y2a5a6i,color_FFFFFF,t_30,g_se,x_10,y_10,shadow_20,type_ZmFuZ3poZW5naGVpdGk=/resize,m_fixed,w_1184)
很像QQ吧，没错，这是2012年版本qq的安卓界面，只是界面元素一样，实现方式大不相同，下面简单列一下这个客户端实现的功能：
1.聊天
2.离线消息
3.添加，删除好友
4.添加，移动好友分组
5.设置昵称
6.监控好友状态
7.网络断开系统自动重连接
8.收到添加好友请求消息处理
9.收到系统广播消息处理
10.查看历史聊天记录
11.消息弹出提醒，和小气泡
....
因为时间关系不是很完美，主要用于学习研究，欢迎大家给我提bug和改进意见。
4.源码下载
分数比较大，不是为了坑大家，是怕有伸手党出现，拿了源码出去招摇撞骗，请尊重作者原创！
