First you need to add the plugin to your project.
You need to add those strings to your Info.plist file in order the plugin to work:
<key>NSPhotoLibraryUsageDescription</key> <string>Example usage description</string> <key>NSCameraUsageDescription</key> <string>Example usage description</string>
You need to request those permissions in AndroidManifest.xml in order the plugin to work:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.CAMERA" />
For example code usage, please see here
Enable Camera in the Gallery
If you wish you can enable the camera in the gallery, so the user can not only chosse photos, but take them as well with the camera.
Enable camera on Android
To do so you need to, create this file in
<?xml version="1.0" encoding="utf-8"?> <paths> <external-path name="multiimagepicker_files" path="Pictures"/> </paths>
And then add file provider in your
android/app/src/main/AndroidManifest.xml, before the
</application> closing tag:
<provider android:name="android.support.v4.content.FileProvider" android:authorities="YOUR_PACKAGE_NAME_HERE.fileprovider" android:exported="false" android:grantUriPermissions="true"> <meta-data android:name="android.support.FILE_PROVIDER_PATHS" android:resource="@xml/file_paths_public"></meta-data> </provider>
Enable camera on iOS
No additional steps needed
That's it. When you invoke the image picker you can then have to set
enableCamera to true, as it is disabled by default:
resultList = await MultiImagePicker.pickImages( maxImages: 300, enableCamera: true, );
Theming and localization
You can customize different parts of the gallery picker. For reference see below the available options for the different platforms:
Customization on Android
Customization on iOS
How I can access the images the user has picked?
When you invoke the image picker and the user picks some images, as response you will get List of Asset objects. The Asset class have two handy methods which allows you to access the picked image date -
requestThumb(width, height), which returns a resized image and
requestOriginal() which returns the original hight quality image. Those methods are asynchronious and return the image date as
ByteData, so you must be careful when to allocate and release this data if you don't need it in different views. For example implementation see the example folder.
Why the plugin don't return image paths directly?
That's not easy task when we speak for cross platform compability. For example on Android the
ContentResolver return content URI's, which not always have a file path. On iOS it get's even more complicated - since there is iCloud and not all of your photos are stored physically on the phone, there is no way to return the file path imediately without first downloading the original image from iCloud to the phone.
You can see how one of the core Flutter plugins - the sinle image_picker, approaches and solves this problem in order to return file paths: it just copies the selected image content to the
tmp folder and retuns the file path from there. Now that works ok when you pick a single image.
But since with the
multi_image_picker you can pick literally thousands of images on one go, this is not possible task.
Another issue on iOS is that starting form iOS 11 all images taken by the camera as stoed in HEIC format. Unfortunately Flutter still don't have codecs to display HEIC images out of the box in image widget.
The aim of this plugin is to be fast and efficient, currently you can pick thousands of images in matter of miliseconds, and still have access to the selected images data whenever you need them. The plugin takes care of both Android and iOS platform specific cases and issue, and will reliebly return the scaled thumb when you invoke
requestThumb or the original image data when you invoke
requestOriginal. You are then free to use this data as you like - display it in image widget or submit the data to a remote API.
- image_picker - Official Flutter image picker plugin
MIT © Radoslav Vitanov