To save an image from ImagePicker into an album without duplicates in an Expo project, you can follow these steps:

  1. Use the Expo ImagePicker API to select an image from the user's gallery.

  2. Generate a unique file name for the image. You can use a combination of the current timestamp and a random string to ensure uniqueness.

  3. Check if the image with the generated file name already exists in the album. If it does, generate a new unique file name and repeat the check until you find an unused file name.

  4. Save the image to the album using Expo's MediaLibrary.createAssetAsync() method, providing the asset URI (local file path) and the album name.

Here's a sample code snippet to demonstrate the process:

javascript
import * as React from 'react'; import { Button, View } from 'react-native'; import * as ImagePicker from 'expo-image-picker'; import * as MediaLibrary from 'expo-media-library'; export default function App() { const [imageUri, setImageUri] = React.useState(null); const pickImage = async () => { let result = await ImagePicker.launchImageLibraryAsync({ mediaTypes: ImagePicker.MediaTypeOptions.Images, allowsEditing: true, quality: 1, }); if (!result.cancelled) { setImageUri(result.uri); } }; const saveToAlbum = async () => { if (imageUri) { const albumName = 'MyAlbum'; const asset = await MediaLibrary.createAssetAsync(imageUri); // Check for duplicates and generate a unique file name let fileName = asset.filename; let i = 1; while (await MediaLibrary.getAssetsAsync({ album: albumName, first: 1000, after: null, sortBy: MediaLibrary.SortBy.creationTime })) { if (!await MediaLibrary.getAssetInfoAsync(`${albumName}/${fileName}`)) { break; } fileName = `${asset.filename}-${i}`; i++; } // Save the asset to the album with the unique file name await MediaLibrary.createAlbumAsync(albumName, asset, false); } }; return ( <View style={{ flex: 1, alignItems: 'center', justifyContent: 'center' }}> <Button title="Pick an image" onPress={pickImage} /> <Button title="Save to Album" onPress={saveToAlbum} /> </View> ); }

In this example, the pickImage() function opens the user's gallery, and the selected image's URI is stored in the imageUri state.

The saveToAlbum() function saves the selected image to the album with the name "MyAlbum". Before saving, it checks for duplicates and generates a unique file name if needed. The unique file name is then used when saving the asset to the album.

Keep in mind that Expo's ImagePicker and MediaLibrary APIs may have slight variations depending on the version you are using. Always refer to the official Expo documentation for the latest information.

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