离子设备插件返回空

Question

无论我做什么或尝试我都无法获取有关该设备的信息。我使用的是 ionic 4 的最新版本。

因为网上找的基本上都是

不要在浏览器上执行
一个一个获取值

当然不是这样。我没有这样做，我有可用的 cordova 等

我正在 android 和 ios 设备上进行测试。我在服务中处理这个问题。我正在用按钮调用函数，所以一切都不仅仅是加载，一切都准备好了。这是我正在努力工作的代码：

import { Injectable } from '@angular/core';
import { Device } from '@ionic-native/device/ngx';
import { Platform } from '@ionic/angular';

@Injectable({
  providedIn: 'root'
})
export class InitialService {

  eldevice: any = '';

  constructor(
    private device: Device,
    private platform: Platform
  ) {}

  async setup() {
    if (this.platform.is('cordova')) { // es movil

      this.eldevice = await this.storage.get('device');

      if (this.eldevice == null) { // nuevo device

        this.eldevice.platform = this.device.platform;
        this.eldevice.version = this.device.version;
        this.eldevice.uuid = this.device.uuid;
        this.eldevice.manufacturer = this.device.manufacturer;

        console.log('datos sin await', this.eldevice);

        this.eldevice = await this.storage.set('device', this.device);

      } else { // device conocido
        console.log('datos guardados', this.eldevice);

      }
    } else { // es virtual
      console.log('virtual');

    }
  }

  clearData() {
    this.storage.clear();
    this.eldevice = null;
  }
}

Answer 1

已更新：

任何 cordova 插件都需要您等待平台处于 "ready" 状态。所以在调用/使用插件之前，你需要调用 platform.ready() 方法并在回调中调用特定的插件函数，或者在 "await".

之后

同时查看您的 setup() 方法，您似乎试图访问在存储检查后获得 'null' 分配给它的对象的属性。请参阅以下代码中的注释：

import { Injectable } from '@angular/core';
import { Device } from '@ionic-native/device/ngx';
import { Platform } from '@ionic/angular';

@Injectable({
  providedIn: 'root'
})
export class InitialService {

  eldevice: any = '';

  constructor(
    private device: Device,
    private platform: Platform
  ) {}

  async setup() {

    // await for platform ready:
    await this.platform.ready();

    if (this.platform.is('cordova')) { // es movil

      this.eldevice = await this.storage.get('device');

      if (this.eldevice == null) { // nuevo device

        // here below 'eldevice' is null (as confirmed by the check above) and you are attempting to assign something to non existing properties (platform, version etc).
        // to fix you need actual object to be assigned to eldevice:
        this.eldevice = {
            platform: this.device.platform,
            version: this.device.version,
            uuid: this.device.uuid,
            manufacturer: this.device.manufacturer
        }
        //this.eldevice.platform = this.device.platform;
        //this.eldevice.version = this.device.version;
        //this.eldevice.uuid = this.device.uuid;
        //this.eldevice.manufacturer = this.device.manufacturer;

        console.log('datos sin await', this.eldevice);

        this.eldevice = await this.storage.set('device', this.device);

      } else { // device conocido
        console.log('datos guardados', this.eldevice);

      }
    } else { // es virtual
      console.log('virtual');

    }
  }

  clearData() {
    this.storage.clear();
    this.eldevice = null;
  }
}

离子设备插件返回空

ionic device plugin returning null

ionic-native

ionic4