Rexsee API介绍：Android定时任务Alarm，附基本的闹钟功能示例

利用Rexsee扩展的Alarm可以快速实现关于任务定时的相关功能，基本的闹钟事件如下

【函数】 void set(String argu)
【说明】 设置闹钟。
【返回】 无
【参数】 argu：型如“key1=value1;key2=value2;......”的参数表。首先，该参数表支持rexseeNotification.show()函数的所有参数，用于显示通知（调用rexseeNotification.show()），请参见rexseeNotification。另外，该参数表增加了以下参数：

• forcerepeat：true或false。当该闹钟是由推送信息而非页面设定时，如果id和之前的推送信息的id重复，由该参数决定是否强制重新执行，默认为false，即不会重复执行任何id重复的推送信息。
• command：闹钟响时要执行的命令，目前支持的命令包括：
  • notification：发送通知，默认值。
  • startApplication：启动程序。
  • cleanApplicationData：清除本程序的业务数据（私有内存中的所有数据）。
• notificationimmediately：true或false，无论命令是否notification，该参数都允许系统在设置闹钟的第一时间先发送一个通知，然后在指定的时间延迟后再执行命令，默认为false。
• notificationafterexec：true或false，无论命令是否notification，该参数都允许系统在执行完命令后发送一个通知，默认为false。
• alermname：闹钟的名称，默认为"defaultAlerm"。
• alermfirsttime：时间戳，第一次闹钟响（即执行命令）的时间，如果设为0或其他小于当前时间的时间戳，命令将立即执行，默认为立即执行。
• alermrepeatinterval：毫秒数，第一次闹钟响之后，间隔该时间后重复执行命令，如果小于零，将不会重复执行。
• startApplicationUrl：如果命令为startApplication，程序启动后访问的URL地址。

【示例】

rexseeAlarm.set('command=startApplication;startApplicationUrl=http://www.rexsee.com/rexsee/alarmClock.html;alermName=test;alermfirsttime='+(rexseeAlarm.getCurrentTime()+5000)+';title=闹钟测试;message=闹钟测试内容;url=http://www.rexsee.com/rexsee/alarmClock.html');
rexseeDialog.toast('设置完毕！');

【函数】 JsonObjectArray get()
【说明】 读取所有的闹钟信息。
【返回】 JSON对象数组，使用eval('('+json+')')转换为JavaScript对象数组。
【参数】 无
【示例】

alert(rexseeAlarm.get());

【函数】 void cancel(String name)
【说明】 取消闹钟。
【返回】 无
【参数】 name：闹钟名称。
【示例】

rexseeAlarm.cancel('test');
rexseeDialog.toast('取消完毕！');

rexseeAlarm.java源码如下：

/* 
* Copyright (C) 2011 The Rexsee Open Source Project 
* 
* Licensed under the Rexsee License, Version 1.0 (the "License"); 
* you may not use this file except in compliance with the License. 
* You may obtain a copy of the License at 
* 
*      http://www.rexsee.com/CN/legal/license.html 
* 
* Unless required by applicable law or agreed to in writing, software 
* distributed under the License is distributed on an "AS IS" BASIS, 
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
* See the License for the specific language governing permissions and 
* limitations under the License. 
*/ 
 
package rexsee.core.alarm;  
 
import rexsee.core.browser.JavascriptInterface;  
import rexsee.core.browser.RexseeBrowser;  
import rexsee.core.device.NotificationArgumentsSheet;  
import rexsee.core.device.RexseeNotification;  
import rexsee.core.receiver._Receiver;  
import android.app.AlarmManager;  
import android.app.PendingIntent;  
import android.content.Context;  
import android.content.Intent;  
import android.database.Cursor;  
import android.database.sqlite.SQLiteDatabase;  
 
public class RexseeAlarm implements JavascriptInterface {  
 
       private static final String INTERFACE_NAME = "Alarm";  
       @Override  
       public String getInterfaceName() {  
               return mBrowser.application.resources.prefix + INTERFACE_NAME;  
       }  
       @Override  
       public JavascriptInterface getInheritInterface(RexseeBrowser childBrowser) {  
               return this;  
       }  
       @Override  
       public JavascriptInterface getNewInterface(RexseeBrowser childBrowser) {  
               return new RexseeAlarm(childBrowser);  
       }  
 
       public static final String ALARM_ACTION = "action.alarm.id_";  
       public static final String ALARM_EXTRA_ARGU = "argu";  
 
       public static final String DATABASE_ALARM = "alarm.db";  
       public static final String TABLE_ALARM = "alarm";  
 
       private final Context mContext;  
       private final RexseeBrowser mBrowser;  
 
       public RexseeAlarm(RexseeBrowser browser) {  
               mBrowser = browser;  
               mContext = browser.getContext();  
       }  
       public RexseeAlarm(Context context) {  
               mBrowser = null;  
               mContext = context;  
       }  
 
       private static void _setAlarm(Context context, AlarmManager mgr, String body, boolean save) {  
               NotificationArgumentsSheet argu = (new NotificationArgumentsSheet()).parseArguments(body);  
               if (argu.notificationimmediately) {  
                       (new RexseeNotification(context)).show(argu);  
               }  
               if (argu.getAlermFirstTime() > System.currentTimeMillis()) {  
                       Intent intent = new Intent(context, _Receiver.class);  
                       intent.setAction(ALARM_ACTION + argu.alermname);  
                       intent.putExtra(ALARM_EXTRA_ARGU, body);  
                       PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);  
                       mgr.cancel(pendingIntent);  
                       long interval = argu.getAlermRepeatInterval();  
                       if (interval > 0) {  
                               mgr.setRepeating(AlarmManager.RTC_WAKEUP, argu.getAlermFirstTime(), interval, pendingIntent);  
                       } else {  
                               mgr.set(AlarmManager.RTC_WAKEUP, argu.getAlermFirstTime(), pendingIntent);  
                       }  
                       if (save) {  
                               SQLiteDatabase db = context.openOrCreateDatabase(DATABASE_ALARM, Context.MODE_PRIVATE, null);  
                               try {  
                                       db.execSQL("CREATE TABLE if not exists " + TABLE_ALARM + " (name TEXT, argu TEXT, Primary key(name));");  
                                       db.execSQL("DELETE FROM " + TABLE_ALARM + " WHERE name='" + argu.alermname + "';");  
                                       db.execSQL("INSERT INTO " + TABLE_ALARM + " VALUES ('" + argu.alermname + "', '" + body + "');");  
                               } catch (Exception e) {  
                               }  
                               db.close();  
                       }  
               } else {  
                       exec(context, body);  
               }  
       }  
       private static void _deleteAlarm(Context context, String name) {  
               SQLiteDatabase db = context.openOrCreateDatabase(DATABASE_ALARM, Context.MODE_PRIVATE, null);  
               try {  
                       db.execSQL("DELETE FROM " + TABLE_ALARM + " WHERE name='" + name + "';");  
               } catch (Exception e) {  
               }  
               db.close();  
       }  
 
       public static void exec(Context context, String body) {  
               NotificationArgumentsSheet argu = (new NotificationArgumentsSheet()).parseArguments(body);  
               if (argu.getAlermRepeatInterval() <= 0) {  
                       _deleteAlarm(context, argu.alermname);  
               }  
               (new RexseeRemoteCommand(context, body)).exec();  
       }  
       public static void updateAlarm(Context context) {  
               SQLiteDatabase db = context.openOrCreateDatabase(DATABASE_ALARM, Context.MODE_PRIVATE, null);  
               AlarmManager mgr = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);  
               try {  
                       db.execSQL("CREATE TABLE if not exists " + TABLE_ALARM + " (name TEXT, argu TEXT, Primary key(name));");  
                       Cursor cursor = db.rawQuery("SELECT * from " + TABLE_ALARM + ";", null);  
                       if (cursor != null && cursor.getCount() != 0) {  
                               for (int i = 0; i < cursor.getCount(); i++) {  
                                       cursor.moveToPosition(i);  
                                       _setAlarm(context, mgr, cursor.getString(1), false);  
                               }  
                       }  
                       cursor.close();  
               } catch (Exception e) {  
               }  
               db.close();  
       }  
 
       //JavaScript Interface  
       public void set(String body) {  
               _setAlarm(mContext, (AlarmManager) mContext.getSystemService(Context.ALARM_SERVICE), body, true);  
       }  
       public String get() {  
               SQLiteDatabase db = mContext.openOrCreateDatabase(DATABASE_ALARM, Context.MODE_PRIVATE, null);  
               String rtn = "";  
               try {  
                       Cursor cursor = db.rawQuery("SELECT * from " + TABLE_ALARM + ";", null);  
                       if (cursor != null && cursor.getCount() != 0) {  
                               for (int i = 0; i < cursor.getCount(); i++) {  
                                       cursor.moveToPosition(i);  
                                       if (i > 0) rtn += ",";  
                                       rtn += "{";  
                                       rtn += "\"name\":\"" + cursor.getString(0) + "\"";  
                                       rtn += ",\"argu\":\"" + cursor.getString(1) + "\"";  
                                       rtn += "}";  
                               }  
                       }  
                       cursor.close();  
               } catch (Exception e) {  
                       if (mBrowser != null) mBrowser.exception(getInterfaceName(), e);  
               }  
               db.close();  
               return "[" + rtn + "]";  
       }  
       public void cancel(String name) {  
               Intent intent = new Intent(mContext, _Receiver.class);  
               intent.setAction(ALARM_ACTION + name);  
               PendingIntent pendingIntent = PendingIntent.getBroadcast(mContext, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);  
               AlarmManager mgr = (AlarmManager) mContext.getSystemService(Context.ALARM_SERVICE);  
               mgr.cancel(pendingIntent);  
               _deleteAlarm(mContext, name);  
       }  
 
       public long getCurrentTime() {  
               return System.currentTimeMillis();  
       }  
       public long getMillisPerHour() {  
               return 3600 * 1000;  
       }  
       public long getMillisPerDay() {  
               return 3600 * 1000 * 24;  
       }  
 
}

仅对Rexsee的源码和函数事件做了整理，相关的demo或源码解析可以在Rexsee社区了解，目前Rexsee已提供了近2000个扩展，覆盖Android原生功能超过90%，且全部开放： h ttp://www.rexsee.com/