Android 如何将摄像头中的图像保存到手机上，并使用ionicframework检索图像以显示在div上

这就是我如何拍摄我的图像

$scope.takePhoto = function () {

        var camera_options = { // CONFIG 1. CAMERA SETTINGS
            quality: 80,
            destinationType: Camera.DestinationType.FILE_URI,
            sourceType: Camera.PictureSourceType.CAMERA,
            allowEdit: false,
            encodingType: Camera.EncodingType.JPEG,
            targetWidth: 100,
            targetHeight: 100,
            correctOrientation: true,
            popoverOptions: CameraPopoverOptions,
            saveToPhotoAlbum: false
        };

        $cordovaCamera.getPicture(camera_options).then(function (imageData) {

            //$scope.imgSrc = "data:image/jpeg;base64," + imageData;

            $scope.imgSrc = imageData;
            $scope.imgData = imageData;

            $scope.$apply();

        }, function (err) {

            $cordovaDialogs.alert('Picture Not Taken', 'Error', 'OK');
        });


    }

之后，我尝试用这种方式将图像保存到android的内存中

 $cordovaFile.writeFile(cordova.file.externalRootDirectory, 'app/profile/' + data.id + '.jpeg', $scope.imgSrc, {'append': false}).then(function (result) {

                $cordovaDialogs.alert('Image saved', 'Success', 'OK');
            }, function (err) {
                // An error occured. Show a message to the user
                $cordovaDialogs.alert('Image not saved', 'Error', 'OK');
            });

保存的图像无法仅打开其非常小的9字节。我做错了什么