节日快乐：使用 Firebase、Angular 2 和 NativeScript 创建移动应用

观看我们网络研讨会 "NativeScript on Fire(base) 🔥" 的录制视频

在 Firebase 控制台中创建项目

• 允许登录和注销、注册以及“忘记密码”例程
• 允许用户将礼品项目输入列表
• 允许用户从列表中删除项目
• 允许用户通过添加描述和照片单独编辑列表中的项目
• 提供来自 Firebase 中远程配置服务的邮件，可以在后端快速更改

• 在 /app/App_Resources/Android 文件夹中，放置从 Firebase 下载的 google.services.json 文件。
• 同样，在 /app/App_Resources/iOS 文件夹中，放置从 Firebase 下载的 GoogleService-Info.plist 文件。

"nativescript-angular": "1.2.0",
"nativescript-camera": "^0.0.8",
"nativescript-iqkeyboardmanager": "^1.0.1",
"nativescript-plugin-firebase": "^3.8.4",
"nativescript-theme-core": "^1.0.2",

// this import should be first in order to load some required settings (like globals and reflect-metadata)
import { platformNativeScriptDynamic } from "nativescript-angular/platform";

import { AppModule } from "./app.module";
import { BackendService } from "./services/backend.service";

import firebase = require("nativescript-plugin-firebase");

firebase.init({
  //persist should be set to false as otherwise numbers aren't returned during livesync
  persist: false,
  storageBucket: 'gs://giftler-f48c4.appspot.com',
  onAuthStateChanged: (data: any) => {
    console.log(JSON.stringify(data))
    if (data.loggedIn) {
      BackendService.token = data.user.uid;
    }
    else {
      BackendService.token = "";
    }
  }
}).then(
  function (instance) {
    console.log("firebase.init done");
  },
  function (error) {
    console.log("firebase.init error: " + error);
  }
  );
platformNativeScriptDynamic().bootstrapModule(AppModule);

onAuthStateChanged: (data: any) => {
    console.log(JSON.stringify(data))
    if (data.loggedIn) {
      BackendService.token = data.user.uid;
    }
    else {
      BackendService.token = "";
    }
  }

export class AuthGuard implements CanActivate {
  constructor(private router: Router) { }

  canActivate() {
    if (BackendService.isLoggedIn()) {
      return true;
    }
    else {
      this.router.navigate(["/login"]);
      return false;
    }
  }

const listRoutes: Routes = [
  { path: "", component: ListComponent, canActivate: [AuthGuard] },
];

public gifts$: Observable;

ngOnInit(){
  this.gifts$ = this.firebaseService.getMyWishList();
}

getMyWishList(): Observable {
  return new Observable((observer: any) => {
      let path = 'Gifts';
        let onValueEvent = (snapshot: any) => {
          this.ngZone.run(() => {
            let results = this.handleSnapshot(snapshot.value);
            console.log(JSON.stringify(results))
             observer.next(results);
          });
        };
        firebase.addValueEventListener(onValueEvent, `/${path}`);
    }).share();
}

handleSnapshot(data: any) {
    //empty array, then refill and filter
    this._allItems = [];
    if (data) {
      for (let id in data) {
        let result = (Object).assign({id: id}, data[id]);
        if(BackendService.token === result.UID){
          this._allItems.push(result);
        }
      }
      this.publishUpdates();
    }
    return this._allItems;
  }

publishUpdates() {
    // here, we sort must emit a *new* value (immutability!)
    this._allItems.sort(function(a, b){
        if(a.date < b.date) return -1;
        if(a.date > b.date) return 1;
      return 0;
    })
    this.items.next([...this._allItems]);
  }

<Label class="gold card" textWrap="true" [text]="message$ | async"></Label>

ngOnInit(){
  this.message$ = this.firebaseService.getMyMessage();
}

getMyMessage(): Observable{
    return new Observable((observer:any) => {
      firebase.getRemoteConfig({
      developerMode: false,
      cacheExpirationSeconds: 300,
      properties: [{
      key: "message",
      default: "Happy Holidays!"
    }]
  }).then(
        function (result) {
          console.log("Fetched at " + result.lastFetch + (result.throttled ? " (throttled)" : ""));
          for (let entry in result.properties)
            {
              observer.next(result.properties[entry]);
            }
        }
    );
  }).share();
}

ngOnInit() {
   camera.requestPermissions();
   ...
  }

takePhoto() {
  let options = {
            width: 300,
            height: 300,
            keepAspectRatio: true,
            saveToGallery: true
        };
    camera.takePicture(options)
        .then(imageAsset => {
            imageSource.fromAsset(imageAsset).then(res => {
                this.image = res;
                //save the source image to a file, then send that file path to firebase
                this.saveToFile(this.image);
            })
        }).catch(function (err) {
            console.log("Error -> " + err.message);
        });
}

saveToFile(res){
  let imgsrc = res;
        this.imagePath = this.utilsService.documentsPath(`photo-${Date.now()}.png`);
        imgsrc.saveToFile(this.imagePath, enums.ImageFormat.png);
}

editGift(id: string){
  if(this.image){
    //upload the file, then save all
    this.firebaseService.uploadFile(this.imagePath).then((uploadedFile: any) => {
          this.uploadedImageName = uploadedFile.name;
          //get downloadURL and store it as a full path;
          this.firebaseService.getDownloadUrl(this.uploadedImageName).then((downloadUrl: string) => {
            this.firebaseService.editGift(id,this.description,downloadUrl).then((result:any) => {
              alert(result)
            }, (error: any) => {
                alert(error);
            });
          })
        }, (error: any) => {
          alert('File upload error: ' + error);
        });
  }
  else {
    //just edit the description
    this.firebaseService.editDescription(id,this.description).then((result:any) => {
        alert(result)
    }, (error: any) => {
        alert(error);
    });
  }
}

uploadFile(localPath: string, file?: any): Promise {
      let filename = this.utils.getFilename(localPath);
      let remotePath = `${filename}`;
      return firebase.uploadFile({
        remoteFullPath: remotePath,
        localFullPath: localPath,
        onProgress: function(status) {
            console.log("Uploaded fraction: " + status.fractionCompleted);
            console.log("Percentage complete: " + status.percentageCompleted);
        }
      });
  }

getDownloadUrl(remoteFilePath: string): Promise {
      return firebase.getDownloadUrl({
        remoteFullPath: remoteFilePath})
      .then(
        function (url:string) {
          return url;
        },
        function (errorMessage:any) {
          console.log(errorMessage);
        });
}

editGift(id:string, description: string, imagepath: string){
    this.publishUpdates();
    return firebase.update("/Gifts/"+id+"",{
        description: description,
        imagepath: imagepath})
      .then(
        function (result:any) {
          return 'You have successfully edited this gift!';
        },
        function (errorMessage:any) {
          console.log(errorMessage);
        });
  }