在AndroidManifest.xml中添加权限

<uses-permission android:name="android.permission.POST_NOTIFICATIONS" />

常用通知的写法，兼容android 8.0之后的版本

    private NotificationManager getNotificationManager() {return (NotificationManager) getSystemService(NOTIFICATION_SERVICE);}private Notification getNotification(String title) {//这里点击通知跳转的以MainActivity为例Intent notificationIntent = new Intent(this, MainActivity.class);PendingIntent pi = PendingIntent.getActivity(this, 0, notificationIntent, PendingIntent.FLAG_UPDATE_CURRENT);CharSequence name = "test";String description = "test_description";int importance = NotificationManager.IMPORTANCE_DEFAULT;NotificationChannel channel = new NotificationChannel("test1", name, importance);channel.enableVibration(true);channel.setVibrationPattern(new long[]{0, 1000, 1000, 1000});NotificationManager manager = getNotificationManager();NotificationCompat.Builder notification = new NotificationCompat.Builder(this).setContentTitle(title).setContentText("this is content text 123456789").setWhen(System.currentTimeMillis()).setSmallIcon(R.mipmap.ic_launcher).setLargeIcon(BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher)).setChannelId("test1").setContentIntent(pi).setLights(Color.GREEN, 1000, 1000).setDefaults(NotificationCompat.DEFAULT_ALL).setAutoCancel(true);if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {//26,android 8.0channel.setDescription(description);NotificationManager notificationManager = getSystemService(NotificationManager.class);notificationManager.createNotificationChannel(channel);}//跳转通知管理页boolean isNotifyEnable = NotificationManagerCompat.from(getApplicationContext()).areNotificationsEnabled();boolean isChannelEnable = true;if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {//26,android 8.0isChannelEnable = channel.getImportance() != NotificationManager.IMPORTANCE_NONE;}if (isNotifyEnable && isChannelEnable) {//发送通知，或者做一些操作，比如设置通知内容//manager.notify(1, notification);notification.setContentText("123456789");} else if (!isNotifyEnable) {Intent intent = new Intent();if (!(getApplicationContext() instanceof Activity)) {intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);}if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {//26,android 8.0intent.setAction(Settings.ACTION_APP_NOTIFICATION_SETTINGS);getApplicationContext().startActivity(intent.putExtra(Settings.EXTRA_APP_PACKAGE, getPackageName()));} else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {//21,android 5.0intent.setAction("android.settings.APP_NOTIFICATION_SETTINGS");getApplicationContext().startActivity(intent.putExtra("android.provider.extra.APP_PACKAGE", getPackageName()));} else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD) {//9,android 2.3intent.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);intent.setData(Uri.fromParts("package", getPackageName(), null));getApplicationContext().startActivity(intent);} else {System.out.println("低于9没有适配必要");}} else {System.out.println("只打开了通知开关，但是关闭了当前channel的通知，开发者需要根据通知重要性,自行决定如何提示用户");}return notification.build();}//发送通知public void sendNotification(String title) {getNotificationManager().notify(1,getNotification(title));}