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//CHANNEL_ID，渠道ID，Android 8.0及更高版本必须要设置

NotificationCompat.Builder builder = new NotificationCompat.Builder(this, CHANNEL_ID)

        //设置小图标

        .setSmallIcon(R.drawable.notification_icon)

        //设置标题

        .setContentTitle(textTitle)

        //设置内容

        .setContentText(textContent)

        //设置等级

        .setPriority(NotificationCompat.PRIORITY_DEFAULT);

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private void createNotificationChannel() {

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {

        CharSequence name = getString(R.string.channel_name);

        String description = getString(R.string.channel_description);

        //不同的重要程度会影响通知显示的方式

        int importance = NotificationManager.IMPORTANCE_DEFAULT;

        NotificationChannel channel = new NotificationChannel(CHANNEL_ID, name, importance);

        channel.setDescription(description);

        NotificationManager notificationManager = getSystemService(NotificationManager.class);

        notificationManager.createNotificationChannel(channel);

    }

}

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//点击时想要打开的界面

Intent intent = new Intent(this, AlertDetails.class);

//一般点击通知都是打开独立的界面，为了避免添加到现有的activity栈中，可以设置下面的启动方式

intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);

//创建activity类型的pendingIntent，还可以创建广播等其他组件

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

NotificationCompat.Builder builder = new NotificationCompat.Builder(this, CHANNEL_ID)

        .setSmallIcon(R.drawable.notification_icon)

        .setContentTitle("My notification")

        .setContentText("Hello World!")

        .setPriority(NotificationCompat.PRIORITY_DEFAULT)

        //设置pendingIntent

        .setContentIntent(pendingIntent)

        //设置点击后是否自动消失

        .setAutoCancel(true);   

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NotificationManagerCompat notificationManager = NotificationManagerCompat.from(this);

//notificationId 相当于通知的唯一标识，用于更新或者移除通知

notificationManager.notify(notificationId, builder.build());