本章节叙述Flutter 通知栏通知功能，主要是使用 Flutter与原生交互功能调用Android发送通知。

效果图

所需知识

Flutter构建通道机制Channel
Android创建通知渠道NotificationChannel发送通知

实现代码

 Flutter端主要实现与原生交互并传递数据

//获取到插件与原生的交互通道
static const mNotificationBar = const MethodChannel('notification_bar.flutter.io/notificationBar');

//发动数据到原生 并返回
String result = await mNotificationBar.invokeMethod('content', map);

 Android端完成两个动作：1构建原生交互通道与flutter对应。2实现发送通知功能

//构建原生通道
new MethodChannel(getFlutterView(), "notification_bar.flutter.io/notificationBar").setMethodCallHandler(
        new MethodCallHandler() {
            @Override
            public void onMethodCall(MethodCall call, Result result) {
                // TODO
                if (call.method.equals("content")) {
                    //解析参数
                    String contentTitle = call.argument("contentTitle");
                    String contentText = call.argument("contentText");
                    // 发送通知
                    sendChatMsg(contentTitle,contentText);
                    if (true) {
                        result.success("success");
                    } else {
                        result.error("error", "failure", null);
                    }
                } else {
                    result.notImplemented();
                }
            }
        }
    );

// 创建两个通知渠道  8.0新特性，不允许使用 NotificationCompat.Builder
  private void initNotificationManager(){
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
      String channelId = "chat";
      String channelName = "聊天消息";
      int importance = NotificationManager.IMPORTANCE_HIGH;
      createNotificationChannel(channelId, channelName, importance);
    }
  }

  @TargetApi(Build.VERSION_CODES.O)
  private void createNotificationChannel(String channelId, String channelName, int importance) {
    NotificationChannel channel = new NotificationChannel(channelId, channelName, importance);
    channel.setShowBadge(true);//开启桌面角标
    channel.setBypassDnd(true);    //设置绕过免打扰模式
    channel.canBypassDnd();       //检测是否绕过免打扰模式
    channel.setLockscreenVisibility(Notification.VISIBILITY_SECRET);//设置在锁屏界面上显示这条通知
    
    //是否需要振动提示
    channel.enableVibration(true);
    //振动模式
    channel.setVibrationPattern(new long[]{100, 200, 300, 400, 500, 400, 300, 200, 400});

    //是否需要呼吸灯提示
    channel.enableLights(true);
    //呼吸灯颜色
    // channel.setLightColor();
    
    NotificationManager notificationManager = (NotificationManager) getSystemService( NOTIFICATION_SERVICE);
    notificationManager.createNotificationChannel(channel);
  }
  public void sendChatMsg(String contentTitle,String contentText) {
    NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
    //检查权限是否开启
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        NotificationChannel channel = manager.getNotificationChannel("chat");
        if (channel.getImportance() == NotificationManager.IMPORTANCE_NONE) {
          Intent intent = new Intent(Settings.ACTION_CHANNEL_NOTIFICATION_SETTINGS);
          intent.putExtra(Settings.EXTRA_APP_PACKAGE, getPackageName());
          intent.putExtra(Settings.EXTRA_CHANNEL_ID, channel.getId());
          startActivity(intent);
          Toast.makeText(this, "请手动将通知打开", Toast.LENGTH_SHORT).show();
        }
    }

    Notification notification = new NotificationCompat.Builder(this, "chat")
            .setContentTitle(contentTitle)
            .setContentText(contentText)
            .setWhen(System.currentTimeMillis())
            .setSmallIcon(R.mipmap.ic_launcher)
            .setLargeIcon(BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher))
            .setAutoCancel(true)
            .setNumber(19)//角标显示数字
            .build();
    manager.notify(1, notification);
  }

完整代码

查看完整代码