显示图库中的图像

Question

我有一个应用程序，允许用户从图库中选择照片或通过相机拍照。我正在尝试显示通过相机拍摄的图像，它工作正常，它返回一个文件路径，如

file:///Users/ray/Library/Developer/CoreSimulator/Devices/C8202B3B-300B-4819-8CD3-4C4AA690CE7C/ data/Applications/D82BF64E-6DD1-4645-B637-BCF65001FD29/tmp/cdv_photo_003.jpg

但是当我尝试从画廊中选择一张照片时，它会显示一个损坏的图像缩略图，并且它会变成一个文件路径。

content://com.android.providers.media.documents/document/image%3A21

Ionic CLI 版本： PRO 4.2.1

科尔多瓦版本： 8.0.0

NPM 版本： 6.4.1

Node.js 版本： 8.11.3

平台：安卓

我也尝试过寻找解决方案，但没有奏效，或者我仍然做错了什么

• Unable to load image when selected from the gallery on Android in phonegap

• https://www.raymondcamden.com/2014/10/10/Cordova-the-Camera-plugin-AngularJS-and-Ninja-Cats

• ionic cordova : how to display an image in img tag from android gallery when i get content:// url from filechooser plugin

• Unable to load image when selected from the gallery on Android 4.4 (KitKat) using PhoneGap Camera Plugin

其中一些建议使用此代码

if (imageURI.substring(0,21)=="content://com.android") {
  photo_split=imageURI.split("%3A");
  imageURI="content://media/external/images/media/"+photo_split[1];
}

但这个解决方案并不是那么可靠，因为并非所有图像源都返回包含“content://com.android”的相同文件路径，就像来自 Google 相册的照片一样> 返回 'content://com.google.android'

_其中一些还建议在目标类型上使用DATA_URL，但这会占用大量内存并可能导致应用崩溃_

这是我的代码：

TS 文件

selectImage(sourceType) {
    const options: CameraOptions = {
      quality: 100,
      destinationType: this.camera.DestinationType.FILE_URI,
      encodingType: this.camera.EncodingType.JPEG,
      mediaType: this.camera.MediaType.PICTURE,
      saveToPhotoAlbum: true,
      sourceType: sourceType
    }

    this.camera.getPicture(options).then((imageData) => {
     let base64Image = 'data:image/jpeg;base64,' + imageData;
     this.imagePreview = imageData;
    }, (err) => {
      this.toastCtrl.presentToast(err);
    });
  }

HTML 文件

<img src="{{imagePreview}}" />;

我希望有人可以帮助我解决这个问题。提前谢谢你????。

Answer 1

let options: CameraOptions = {
  quality: 100,
  sourceType: this.camera.PictureSourceType.SAVEDPHOTOALBUM,
  saveToPhotoAlbum: true,
  correctOrientation: true,
  encodingType: this.camera.EncodingType.JPEG,
  destinationType: this.camera.DestinationType.FILE_URI
};

this.camera.getPicture(options).then((imageData) => {
  let photo_split=imageData.split("%3A");
  let photo_split2=photo_split[0].split("?");
  let filename = photo_split2[0].substring(photo_split2[0].lastIndexOf('/')+1);
  let path =  photo_split2[0].substring(0,photo_split2[0].lastIndexOf('/')+1);

  alert(photo_split2[0])
  alert(filename)
  alert(path)
  this.file.readAsDataURL(path, filename).then(res=> {
    alert("FUNCIONA!")
    this.imageURI = res;
  }).catch((reason) => {
    alert(JSON.stringify(reason));
  });
}).catch((reason) => {
  alert(JSON.stringify(reason));
});

//HTML

    <img alt="uploaded Image" [src]="imageURI">

Answer 2

使用 DomSanitizer https://devfanaticblog.com/working-with-camera-in-ionic-2-and-ionic-native/ 解决了我的问题

Answer 3

试试这个：-

   //From Gallery
     ChooseGallery() {
        var _self=this;
        const options: CameraOptions = {
          allowEdit: true,
          correctOrientation: true,
          quality: 100, // picture quality
          destinationType: this.camera.DestinationType.FILE_URI,
          encodingType: this.camera.EncodingType.JPEG,
          sourceType: this.camera.PictureSourceType.SAVEDPHOTOALBUM
        }
        this.camera.getPicture(options).then((ImageData) => {
          _self.base64value = ImageData;
        })
      }

来自相机

  ChooseCamera() {
    var _self=this;
    const options: CameraOptions = {
      allowEdit: true,
      correctOrientation: true,
      quality: 100, // picture quality
      destinationType: this.camera.DestinationType.FILE_URI,
      encodingType: this.camera.EncodingType.JPEG,
      mediaType: this.camera.MediaType.PICTURE
    }
    this.camera.getPicture(options).then((ImageData) => {
      _self.base64value =  ImageData;
    })
  }

我希望这会有所帮助！谢谢！

Answer 4

ts：

public base64Image:string; 
public getImage(){
const options: CameraOptions = {
  quality: 100,
  destinationType: this.camera.DestinationType.DATA_URL,
  encodingType: this.camera.EncodingType.JPEG,
  mediaType: this.camera.MediaType.PICTURE
}

this.camera.getPicture(options).then((imageData) => {
 this.base64Image = 'data:image/jpeg;base64,' + imageData;
}, (err) => {
 // Handle error
});
}

html:

<imge src={{base64Image}} />