小编jam*_*phy的帖子

看下面我的代码非常简单......它监听实时数据库中数据库字段的变化。

const functions = require("firebase-functions");
var admin = require("firebase-admin");

exports.onActiveUpdate = functions.database
  .ref("/profiles/users/{userId}/active")
  .onUpdate((change, context) => {
      //code here
      
    return true;
  });

我尝试使用以下命令在本地调试代码

firebase serve --only functions
firebase serve
firebase emulators:start

我总是收到同样的消息...

+  functions: Emulator started at http://localhost:5001
i  functions: Watching "C:\code\rn\xs\fb_functions\functions" for Cloud Functions...
i  functions[onActiveUpdate]: function ignored because the database emulator does not exist or is not running.
+  All emulators started, it is now safe to connect.

但是当我转到 localhost:5001 时......我看到的只是一个{"status":"alive"}顶部带有 的空白页面。

这是正确的行为吗？谢谢

我试图找到一种有效的方法来在上传图像后立即在 firebase 中获取图像的 url。我想避免编写一个完全独立的函数......相反，我想将它包含在承诺链中。请参阅下面的代码

import storage from '@react-native-firebase/storage';

storage()
        .ref('path/to/remote/folder')
        .putFile('uri/of/local/image')
        .then(() => {
          //Id like to use getDownloadUrl() function here;
        })

有人可以让我知道我哪里出错了。从我可以上看到的说明....世界上没有如果你只使用本地通知，并使用autolinking ....除了添加需要到Android特定文件修改googlePlayServicesVersion = "<Your play services version>" // default: "+"到android/build.gradle....，并<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>加<uses-permission android:name="android.permission.VIBRATE" />至AndroidManifest.xml

下面是我的主要源代码

PushNotification.configure({
  // (optional) Called when Token is generated (iOS and Android)
  onRegister: function(token) {
    console.log('onRegister token:', token);
  },

  // (required) Called when a remote is received or opened, or local notification is opened
  onNotification: function(notification) {
    console.log('onNotification:', notification);
    notification.finish(PushNotificationIOS.FetchResult.NoData);
  },

  // Should the initial notification be popped automatically
  popInitialNotification: true,
  requestPermissions: true,
});

  userNowInactive = …

我觉得我在这里疯了......我在搜索栏中输入“x”，但this.setState({ filter: text });没有更新状态......console.log(this.state.filter);给了我一个值“”（它的初始值在构造函数中设置）。我可以看到文本变量的值为 x...但它只是不更新​​过滤器状态。

constructor(props) {
    super(props);

    this.state = {
      timer: 30 * 60,
      lat: 0,
      lng: 0,
      loading: false,
      data: [],
      pagetoken: null,
      refreshing: false,
      waiting4answer: false,
      placeName: null,
      placeUri: null,
      filter: '',
    };

}

renderHeader = () => {
    if (this.state.waiting4answer === false) return null;
    return (
      <SearchBar
        placeholder="Type Here..."
        lightTheme
        round
        onChangeText={(text) => {
          this.setState({ filter: text });
          console.log(this.state.filter);
          this.searchFilterFunction();
        }}
        autoCorrect={false}
      />
    );
  };

我正在尝试将本地图像从手机保存到 firebase 存储，但收到以下错误。

Permission Denial: reading com.google.android.apps.photos.contentprovider/........uid=XXXXX requires the provider be exported, or grantUriPermission()

请参阅下面的代码。 await imageRef.putFile(localUri, {contentType: 'image/jpg'});是问题发生的地方

const uploadImageAndGetUrl = async (localUri, firebasePath) => {
  try {
    const imageRef = storage().ref(firebasePath);
    await imageRef.putFile(localUri, {contentType: 'image/jpg'});
    const url = await imageRef.getDownloadURL();
    return url;
  } catch (err) {
    Alert.alert('Profile.js.....Error getting image url from FB', err);
  }
};

清单如下：

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name = "android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>