Android--通知栏

    public void notificationManagerTest(View view){
        NotificationManager manager= (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        //下面的频道id一定要设置为State，不然会失效
        NotificationCompat.Builder builder=new NotificationCompat.Builder(MainActivity.this, "State");
        builder.setContentText("content");//内容
        builder.setContentTitle("title");//标题
        builder.setSmallIcon(R.drawable.ic_launcher_background);//图标；无论如何都一定要设置，不然会报错
        builder.setWhen(System.currentTimeMillis());

        manager.notify(1, builder.build());
    }