native.js实现AlarmManager定时任务

由于公司业务需要，必须需要定时任务，以前从来没用过JAVA写代码，只能先研究了原生代码，再研究了《Android平台通过native.js实现接收系统消息，如监听安装卸载apk事件》，有了以下代码，在android9.0通过测试，代码如下：

var AlarmManager;  
var PendingIntent;  
var Intent;  
var IntentFilter;  
var Context;  
var Calendar;  
var main;  
var System;  
var receiver;  
var ALARM_EVENT = "com.kkaass.alarm";  

mui.plusReady(function(){  
    AlarmManager = plus.android.importClass('android.app.AlarmManager');  
    PendingIntent = plus.android.importClass('android.app.PendingIntent');  
    Intent = plus.android.importClass('android.content.Intent');  
    IntentFilter = plus.android.importClass('android.content.IntentFilter');  
    Context = plus.android.importClass('android.content.Context');  
    receiver = plus.android.implements('io.dcloud.android.content.BroadcastReceiver',{  
        onReceive:function(context,intent){  
            if(intent != null){  
                console.log('闹铃来了');  
                SetAlarm();  
            }  
        }  
    });  
    main = plus.android.runtimeMainActivity();  
    Calendar = plus.android.importClass('java.util.Calendar');  
    System = plus.android.importClass('java.lang.System');  
    var intentfilter = new IntentFilter();  
    intentfilter.addAction(ALARM_EVENT);  
    main.registerReceiver(receiver,intentfilter)  

});  

function SetAlarm(){  
    var intent = new Intent(ALARM_EVENT);  
    var pendingintent = PendingIntent.getBroadcast(main,0,intent,PendingIntent.FLAG_UPDATE_CURRENT);  
    var alarmManager =main.getSystemService(Context.ALARM_SERVICE);  
    var calendar = Calendar.getInstance();  
    calendar.setTimeInMillis(System.currentTimeMillis());  
    calendar.add(Calendar.SECOND,20);  
    alarmManager.setAndAllowWhileIdle(AlarmManager.RTC_WAKEUP,calendar.getTimeInMillis(),pendingintent);//setAndAllowWhileIdle方法API>=23才能使用  

}