Push notifications on Android do not work in the background

var pushNotification;

pushNotification=window.plugins.pushNotification;

if(device.platform=='android'||device.platform=='Android'){
    pushNotification.register(
        successHandler,
        errorHandler, {
            "senderID": 12345678, // Actually, you have set the correct ID.
            "ecb": "onNotification"
        });
} else{
    // ios
    pushNotification.register(
        tokenHandler,
        errorHandler, {
            "badge": "true",
            "sound": "true",
            "alert": "true",
            "ecb": "onNotificationAPN"
        });
}

function successHandler(result){
    console.log('result='+result);
}

function tokenHandler(result){
    console.log('device token='+result);
}

function errorHandler(error){
    console.log('error='+error);
}

function onNotificationAPN(event){
    if(event.alert){
        navigator.notification.alert(event.alert);
    }
    if(event.sound){
        varsnd = new Media(event.sound);
        snd.play();
    }
    if(event.badge){
        pushNotification.setApplicationIconBadgeNumber(successHandler, errorHandler, event.badge);
    }
}

// Android and Amazon Fire OS
window.onNotification=function(e){
    switch(e.event){
        case 'registered':
            if(e.regid.length>0){
                console.log("regID(device token)="+e.regid);
            }
            break;
        case 'message':
            if(e.foreground){
                alert(e.payload.default);
            } else{
                if(e.coldstart){
                    console.log("===message.background.coldstart===");
                } else{
                    console.log("===message.background.non coldstart===");
                }
            }
            break;
        case 'error':
            console.log('error');
            break;
        default:
            break;
    }
};