要创建一个自定义的Notification，可以使用RemoteViews。要定义自己的扩展消息，首先要初始化一个RemoteViews对象，然后将它传递给Notification contentView字段，再把PendingIntent传递给contentIntent字段。以下示例代码是完整步骤：
//1、创建一个自定义的消息布局 view.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent" android:layout_height="fill_parent">
<ImageView android:id="@+id/image" android:layout_width="wrap_content"
android:layout_height="fill_parent" android:layout_marginRight="10dp" />
<TextView android:id="@+id/text" android:layout_width="wrap_content"
android:layout_height="fill_parent" android:textColor="#000" />
</LinearLayout>
//2、在程序代码中使用RemoteViews的方法来定义image和text。然后把RemoteViews对象传到contentView字段
RemoteViews contentView = new RemoteViews(getPackageName(),R.layout.view);
contentView.setImageViewResource(R.id.image,R.drawable.icon);
contentView.setTextViewText(R.id.text,”Hello,this message is in a custom expanded view”);
notification.contentView = contentView;
//3、为Notification的contentIntent字段定义一个Intent(注意，使用自定义View不需要setLatestEventInfo()方法)
Intent notificationIntent = new Intent(this,Main.class);
PendingIntent contentIntent = PendingIntent.getActivity(this,0,notificationIntent,0);
notification.contentIntent = contentIntent;
//4、发送通知
mNotificationManager.notify(2,notification);
//以下是全部示例代码
//创建一个NotificationManager的引用
String ns = Context.NOTIFICATION_SERVICE;
NotificationManager mNotificationManager = (NotificationManager)getSystemService(ns);
//定义Notification的各种属性
int icon = R.drawable.icon; //通知图标
CharSequence tickerText = "Hello"; //状态栏显示的通知文本提示
long when = System.currentTimeMillis(); //通知产生的时间，会在通知信息里显示
//用上面的属性初始化Nofification
Notification notification = new Notification(icon,tickerText,when);
RemoteViews contentView = new RemoteViews(getPackageName(),R.layout.view);
contentView.setImageViewResource(R.id.image, R.drawable.iconempty);
contentView.setTextViewText(R.id.text, "Hello,this is JC");
notification.contentView = contentView;
Intent notificationIntent = new Intent(this,Main.class);
PendingIntent contentIntent = PendingIntent.getActivity(this,0,notificationIntent,0);
notification.contentIntent = contentIntent;
//把Notification传递给NotificationManager
mNotificationManager.notify(0,notification);
来自：http://blog.csdn.net/iamfafa/article/details/6298011