使用 HTTP/2 API 确定何时在 expo 上发送推送通知

Determine when to send push notifications on expo with HTTP/2 API

我正在尝试构建一个水提醒应用程序。我有 3 个屏幕,我正在使用 react-navigation

我正在尝试使用 expo 推送通知及其 HTTP/2 API 向我的用户发送推送通知。但是我对此有点迷茫,下面有这些问题。

  1. 下面的推送通知代码在哪里写调用HTTP/2API? (App.js、通知还是设置?)
  2. 如何根据用户选择确定何时发送此通知,例如每小时发送一次。

我获取权限的代码,存储密钥并调用api发送通知。

    registerforPushNotifications = async () => {
    // check fox existing permission
    const { status } = await Permissions.getAsync(Permissions.NOTIFICATIONS);
    let finalStatus = status;

    // if no existing permission granted ask user
    if (status !== 'granted') {
      const { status } = await Permissions.askAsync(Permissions.NOTIFICATIONS);
      finalStatus = status;
    }

    //if no permission is granted exit the status
    if (finalStatus !== 'granted') {
      return;
    }

    // get the token
    let token = await Notifications.getExpoPushTokenAsync();

    const request = {
      to: token,
      title: "Don't forget to drink water",
    };

    _storeToken = async () => {
      try {
        await AsyncStorage.setItem('token', token.toString());
      } catch (error) {
        console.log(error.message);
      }
    };

    _storeToken();

    return fetch('https://exp.host/--/api/v2/push/send', {
      method: 'POST',
      headers: {
        'host':'exp.host',
        'accept': 'application/json',
        'content-Type': 'application/json',
        'accept-encoding': 'gzip, deflate'
      },
      body: JSON.stringify(request),
    }).then(data => {console.log(data)});
  };

我收到的回复

"_bodyInit": "{\"data\":{\"status\":\"ok\",\"id\":\"93d0f654-d8f6-4587-b4bb-ed4f5cd08b68\"}}",

我决定不使用 firebase,而是使用

Notifications.scheduleLocalNotificationAsync(localNotification, schedulingOptions)

这有助于我安排本地通知在将来某个特定时间或给定时间间隔触发。

参数

localNotification (object) -- 具有 LocalNotification 中描述的属性的对象。

schedulingOptions (object) -- 描述通知何时触发的对象。

  • time(日期或数字) -- 表示何时触发 通知或 Unix 纪元时间的数字。示例:(新 Date().getTime() + 1000 是从现在开始的一秒。

  • 重复(可选)(字符串) -- 'minute'、'hour'、'day'、'week',
    'month',或'year'.

  • (仅Android) intervalMs (optional) (number) -- Repeat interval in
    毫秒数

    componentDidMount() { this.willFocusSubscription = this.props.navigation.addListener('willFocus', 负载 => {

      // call the functions after component did mounted
      this._handleLocalNotification();
      this.listenForNotifications();
    });}
    
    // function to request permission to send notifications and schedule notifications
    _handleLocalNotification = async () => {
    // check fox existing permission
    const { status } = await Permissions.getAsync(Permissions.NOTIFICATIONS);
    let finalStatus = status;
    
    // if no existing permission granted ask user
    if (status !== 'granted') {
      const { status } = await Permissions.askAsync(Permissions.NOTIFICATIONS);
      finalStatus = status;
    }
    
    //if no permission is granted exit the status
    if (finalStatus !== 'granted') {
      return;
    }
    
    const localnotification = {
      title: 'Water Reminder',
      body: 'Dont forget to drink water!',
      android: {
        sound: true,
      },
      ios: {
        sound: true,
      },
    };
    let sendAfterFiveSeconds = Date.now();
    sendAfterFiveSeconds += 5000;
    
    const schedulingOptions = { time: sendAfterFiveSeconds };
    Notifications.scheduleLocalNotificationAsync(localnotification, schedulingOptions);
      };
    

    // 监听应用程序打开时是否收到通知的函数。当它收到时,它会创建并提醒

      listenForNotifications = () => {
        Notifications.addListener(notification => {
          if (notification.origin === 'received') {
            Alert.alert(localnotification.title, localnotification.body);
          }
        });
      };