Cannot view copied image using cordova.file.dataDirectory+"copiedfile.jpg"

Hello,
I m trying to copy the file from PHOTOLIBRARY to cordova.file.dataDirectory to my local storage.
The file is getting copied as i ran the below command and checked
adb shell > run-as io.ionic.starter > cd files > ls > copiedfile.jpg
But when i try to view, it shows broken image.
below is my code and link which i followed to copy my file.
link : https://devdactic.com/ionic-2-images/

code:

  public presentActionSheet() {
    let actionSheet = this.actionSheetCtrl.create({
      title: 'Select Image Source',
      buttons: [
        {
          text: 'Load from Library',
          handler: () => {
            this.takePicture(this.camera.PictureSourceType.PHOTOLIBRARY);
          }
        },
        {
          text: 'Use Camera',
          handler: () => {
            this.takePicture(this.camera.PictureSourceType.CAMERA);
          }
        },
        {
          text: 'Cancel',
          role: 'cancel'
        }
      ]
    });
    actionSheet.present();
  }


public takePicture(sourceType) {
	  // Create options for the Camera Dialog
	var options = {
	    quality: 100,
	    sourceType: sourceType,
	    saveToPhotoAlbum: false,
	    correctOrientation: true
	};
	 
	  // Get the data of an image
	this.camera.getPicture(options).then((imagePath) => {
    // Special handling for Android library
	    if (sourceType === this.camera.PictureSourceType.PHOTOLIBRARY) {
	      this.filePath.resolveNativePath(imagePath)
	        .then(filePath => {
	          let correctPath = filePath.substr(0, filePath.lastIndexOf('/') + 1);
	          let currentName = imagePath.substring(imagePath.lastIndexOf('/') + 1, imagePath.lastIndexOf('?'));
	          this.checkAndCreateDir(correctPath, currentName, this.user.username+"_avatar.jpg");
	        });
	    } else {
	      var currentName = imagePath.substr(imagePath.lastIndexOf('/') + 1);
	      var correctPath = imagePath.substr(0, imagePath.lastIndexOf('/') + 1);
	      this.checkAndCreateDir(correctPath, currentName, this.user.username+"_avatar.jpg");
	    }
	  }, (err) => {
	    this.presentToast('Error while selecting image.');
	  });
	}

private checkAndCreateDir(namePath, currentName, newFileName) {
		this.dir = "";
		this.copyFileToDir(namePath, currentName, newFileName, this.dir);
	}

	private copyFileToDir(namePath, currentName, newFileName, dir){
		// this.common.showError("Response", cordova.file.dataDirectory+dir);
		this.file.copyFile(namePath, currentName, cordova.file.dataDirectory+dir , newFileName).then(success => {
		    this.lastImage = cordova.file.dataDirectory+newFileName;
		  	this.common.showError("Response", this.lastImage);
		}, error => {
		    this.common.showError("Response", JSON.stringify(error));
		});
	}

<ion-content padding>
  <img src="{{pathForImage(lastImage)}}" style="width: 100%" [hidden]="lastImage === null">
  <h3 [hidden]="lastImage !== null">Please Select Image!</h3>
</ion-content>
 
<ion-footer>
  <ion-toolbar color="primary">
    <ion-buttons>
      <button ion-button icon-left (click)="presentActionSheet()">
        <ion-icon name="camera"></ion-icon>Select Image
      </button>
      <button ion-button icon-left (click)="uploadImage()" [disabled]="lastImage === null">
        <ion-icon name="cloud-upload"></ion-icon>Upload
      </button>
    </ion-buttons>
  </ion-toolbar>
</ion-footer>