安卓系统通知用户三种方式：

1.Toast Notification

2.Dialog Notification

3.Status Bar Notification Status Bar Notification，状态栏通知

发送一个状态栏通知必须用到两个类：NotificationManager，Notification

1.NotificationManager是一个系统Service，必须通过getSystemService()获取

NotificationManager notificationManager=(NotificationManager) getSystemService(NOTIFICATION_SERVICE);

2.Notification是具体的状态栏通知对象

调用NotificationManager的notify()方法创建Notification

两部分：

①：状态栏通知    

notification.icon=R.drawable.ic_launcher;     

notification.tickerText="My First Notification";     

notification.when=System.currentTimeMillis();

②：下拉通知列表和点击跳转：

两种方式：

一：setLatestEventInfo()方法     

Context context = getApplicationContext();     

CharSequence contentTitle="Notification";     

CharSequence contentText="Notification Context";     

Intent intent=new Intent(Main.this,Turn.class);    

PendingIntent pendingIntent=PendingIntent.getActivity(Main.this, 0, intent, 0);     

notification.setLatestEventInfo(context, contentTitle, contentText, pendingIntent);

二：自定义通知栏

notification.flags=Notification.FLAG_AUTO_CANCEL;用户点击后通知自动取消

设置两个变量contentView和contentIntent     

RemoteViews contenView=new RemoteViews(getPackageName(), R.layout.notification_layout);     

contenView.setImageViewResource(R.id.icon, R.drawable.ic_launcher);     

contenView.setTextViewText(R.id.contentText, "自定义通知");     

notification.contentView=contenView;          

Intent intent1=new Intent(Main.this,Turn.class);     

PendingIntent pendingIntent1=PendingIntent.getActivity(Main.this, 0, intent1, 0);     

notification.contentIntent=pendingIntent1;

Tips:

可能遇到的错误：Couldn't expand RemoteViews for:

检查是否是RemoteViews对应的layout里使用了它不支持的组件

检查RemoteViews对应的layout布局文件是否有基本错误，例如忘记声明宽高等