我使用了文件插件和它的方法readAsDataURL。它对我来说工作得很好。希望它能帮助那里的人：）

const options: CameraOptions = {
      quality: 100,
      allowEdit: true,
      sourceType:  this.camera.PictureSourceType.CAMERA ,
      saveToPhotoAlbum: true,
      correctOrientation: true,
      encodingType: this.camera.EncodingType.JPEG,
      destinationType: this.camera.DestinationType.FILE_URI
    }

this.camera.getPicture(options).then((imageData) => {

    //imageData will hold the full file path so we need to extract filename and path using file plugin 
     var filename = imageData.substring(imageData.lastIndexOf('/')+1);
     var path =  imageData.substring(0,imageData.lastIndexOf('/')+1);
    //then use it in the readAsDataURL method of cordova file plugin
    //this.file is declared in constructor file :File
         this.file.readAsDataURL(path, filename).then(res=>{
           item.pic = res;
         });
}, (err) => {
 alert(err);
});

link for ionic cordova file plugin

最后我得到了解决方案：
在组件中：

takePhoto(){
    const options: CameraOptions = {
      quality: 100,
      targetHeight: 320,
      targetWidth: 320,
      destinationType: this.camera.DestinationType.FILE_URI,
      sourceType: this.camera.PictureSourceType.CAMERA,
      encodingType: this.camera.EncodingType.JPEG,
      mediaType: this.camera.MediaType.PICTURE
    }

    this.camera.getPicture(options).then((imgFileUri) => {
     this.myImg = (<any>window).Ionic.WebView.convertFileSrc(imgFileUri);
    }, (err) => {
     console.log(err);
    });
  }

在html中：

<img [src]="myImg" />

注意：cordova插件离子网络视图〉= 4

在ts文件中使用此函数

takePhoto(){
    const options: CameraOptions = {
      quality: 100,
      targetHeight: 320,
      targetWidth: 320,
      destinationType: this.camera.DestinationType.DATA_URL,
      sourceType: this.camera.PictureSourceType.CAMERA,
      encodingType: this.camera.EncodingType.JPEG,
      mediaType: this.camera.MediaType.PICTURE
    }

    this.camera.getPicture(options).then((imageData) => {
      // imageData is either a base64 encoded string or a file URI
      // If it's base64 (DATA_URL):
      this.myPhoto = 'data:image/jpeg;base64,' + imageData;
      this.image = imageData;
      console.log(this.myPhoto);
    }, (err) => {
      // Handle error
    });
  }

在您的html中使用它

<img [src]="myPhoto"/>

从新离子和电容器可以这样做：

import { Capacitor } from '@capacitor/core';

Capacitor.convertFileSrc(filePath);

Capacitor和Cordova应用程序托管在本地HTTP服务器上，并通过http：//协议提供服务。但是，某些插件会尝试通过file：//协议访问设备文件。为了避免http：//和file：//之间的问题，必须重写设备文件的路径以使用本地HTTP服务器。例如，file：///path/to/device/file必须重写为http：//：//path/to/device/file，然后才能在应用程序中呈现。

按以下方式修改您home.ts，

private openGallery(): void {
    let cameraOptions = {
      sourceType: this.camera.PictureSourceType.PHOTOLIBRARY,
      destinationType: this.camera.DestinationType.FILE_URI,
      quality: 100,
      targetWidth: 1000,
      targetHeight: 1000,
      encodingType: this.camera.EncodingType.JPEG,
      correctOrientation: true
    }

    this.camera.getPicture(cameraOptions)
      .then(file_uri => this.imageSrc = file_uri,
      err => console.log(err));
  }

在html文件中，

<img [src]="imageSrc"/>