当应用程序不在后台或前台，不能推送通知到通知管理器

我正在开发一个Android应用程序，我想推送通知到NotificationManager，如果即使应用程序不在后台，但无法做到这一点。当应用程序不在后台或前台，不能推送通知到通知管理器

当应用程序在打开工作。

当应用程序在后台木材加工

当应用程序在没有背景或前景 - 不是工作

NotificationManager notificationMgr = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);NotificationCompat.Builder notificationMsg = new NotificationCompat.Builder(ctx); 
     notificationMsg.setContentTitle(notification.getTitle()); 
     notificationMsg.setTicker(notification.getTitle()); 
     notificationMsg.setPriority(notification.getPriority()); 
     notificationMsg.setSmallIcon(R.drawable.foo_icon); 
     notificationMsg.setStyle(new NotificationCompat.BigTextStyle().bigText(notification.getDescription())); 
     notificationMsg.setContentText(notification.getDescription()); 
     if (notificationIcon != null) 
     { 
      notificationMsg.setLargeIcon(notificationIcon); 
     } 
     else 
     { 
      // notificationMsg.setLargeIcon(R.drawable.foo_icon); 
     } 
     notificationMsg.setColor(ctx.getResources().getColor(R.color._9c9c9c)); 
     notificationMsg.setLights(R.color.green_normal,5000,5000); 
     notificationMsg.setVibrate(new long[]{100,250,100,500}); 

     notificationMsg.setAutoCancel(true); 
     if ((notification.getGroupName() != null) &&(notification.getGroupValue() != null)) 
     { 
      notificationMsg.setGroup(notification.getGroupName()+notification.getGroupValue()); 
     } 
     /* Add Actions to Notification */ 
     addActionsToNotificationWindow(notificationMsg,notification,ctx); 
     int reqCode = Math.abs((int) System.currentTimeMillis()); 
     PendingIntent contentIntent = PendingIntent.getActivity(ctx, reqCode, targetIntent, PendingIntent.FLAG_CANCEL_CURRENT); 
     notificationMsg.setContentIntent(contentIntent); 

     /* Display notification*/ 
     notifyMgr.notify(notification.getId(),notificationMsg.build());

我使用上面的代码通知通知管理器，并使用Android的下列权限清单文件

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    package="com.example.foo" 
    android:versionCode="1" 
    android:versionName="0.1" > 

    <uses-sdk 
     android:minSdkVersion="16" 
     android:targetSdkVersion="19" /> 
    <permission 
     android:name="com.disha.quickride.permission.MAPS_RECEIVE" 
     android:protectionLevel="signature" /> 
    <uses-permission android:name="android.permission.READ_LOGS" /> 
    <permission 
     android:name="com.disha.quickride.permission.C2D_MESSAGE" 
     android:protectionLevel="signature" /> 
    <uses-permission android:name="android.permission.ACCESS_GPS" /> 
    <uses-permission android:name="android.permission.ACCESS_LOCATION" /> 
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> 
    <uses-permission android:name="com.disha.quickride.permission.MAPS_RECEIVE" /> 
    <uses-permission android:name="android.permission.INTERNET" /> 
    <uses-permission android:name="android.permission.GET_ACCOUNTS" /> 
    <uses-permission android:name="android.permission.WAKE_LOCK" /> 
    <uses-permission android:name="com.google.android.c2dm.permission.RECEIVE" /> 
    <uses-permission android:name="com.disha.quickride.permission.C2D_MESSAGE" /> 
    <uses-permission android:name="com.google.android.c2dm.permission.SEND" /> 
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> 
    <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" /> 
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> 
    <uses-permission android:name="android.permission.CAMERA" /> 
    <uses-permission android:name="android.permission.RECEIVE_SMS"/> 
    <uses-permission android:name="android.permission.CALL_PHONE" /> 
    <uses-permission android:name="android.permission.READ_PHONE_STATE" /> 
    <uses-permission android:name="android.permission.READ_SMS" /> 
    <uses-permission android:name="android.permission.VIBRATE" /> 
    <uses-permission android:name="android.permission.SEND_SMS" /> 
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> 
    <uses-permission android:name="android.permission.GET_TASKS" /> 
    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/> 
    <uses-feature android:name="android.hardware.camera" /> 
    <uses-feature android:name="android.hardware.camera.autofocus" />

来源

2015-09-04 Lakshmi Kanth

什么样的通知，这是一个通知？ GCM ?? 发布更多相关的代码。 –

使用Mqtt推送通知 –

添加用于服务声明的服务代码和AndroidManifest代码。 –