Ionic framework Ionic应用程序在打开本机摄像头后崩溃-错误20

我正在使用爱奥尼亚4上的cordova摄像头插件来拍摄一些图像

takePicture() {
   console.log(' camera takePicture ');
   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.selectedImage = 'data:image/jpeg;base64,' + imageData;
 }, (err) => {
   // Handle error
   console.log('Camera issue:' + err);
 });

}

应用程序不会崩溃，但此代码始终返回摄像头问题：20，并且摄像头界面从未出现在手机屏幕上

我试图像这样修改config.xml文件，因为我认为android权限有问题，但仍然不起作用：

<config-file mode="merge" parent="/*" target="AndroidManifest.xml">
        <uses-permission android:name="android.permission.CAMERA" />
        <uses-feature android:name="android.hardware.camera" />
        <uses-feature android:name="android.hardware.camera.autofocus" />
<!--            <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />-->
<!--            <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />-->
</config-file>

我不知道怎么解决这个问题，我需要一些帮助。

---

谢谢

您应该使用

cordova插件相机预览

插件在爱奥尼亚操作相机。请注意，此插件仅与Android和iOS兼容

安装时请使用：

ionic cordova plugin add cordova-plugin-camera-preview
npm install @ionic-native/camera-preview

用法：

// camera options (Size and location). In this example, the preview uses the rear camera and displays the preview in the back of the webview 
const cameraPreviewOpts: CameraPreviewOptions = { 
    x: 0, 
    y: 0, 
    width: window.screen.width, 
    height: window.screen.height, 
    camera: 'rear', 
    tapPhoto: true, 
    previewDrag: true, 
    toBack: true, 
    alpha: 1 
} 

// start camera 
this.cameraPreview.startCamera(cameraPreviewOpts).then( 
    (res) => { console.log(res) }, 
    (err) => { console.log(err) }
);

// camera options (Size and location). In this example, the preview uses the rear camera and displays the preview in the back of the webview 
const cameraPreviewOpts: CameraPreviewOptions = { 
    x: 0, 
    y: 0, 
    width: window.screen.width, 
    height: window.screen.height, 
    camera: 'rear', 
    tapPhoto: true, 
    previewDrag: true, 
    toBack: true, 
    alpha: 1 
} 

// start camera 
this.cameraPreview.startCamera(cameraPreviewOpts).then( 
    (res) => { console.log(res) }, 
    (err) => { console.log(err) }
);