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Button(
    onClick = {
        //On button press, launch the photo picker
        launcher.launch(PickVisualMediaRequest(
            //Here we request only photos. Change this to .ImageAndVideo if
            //you want videos too.
            //Or use .VideoOnly if you only want videos.
            mediaType = ActivityResultContracts.PickVisualMedia.ImageOnly
        ))
    }

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//The URI of the photo that the user has picked
var photoUri: Uri? by remember { mutableStateOf(null) }

//The launcher we will use for the PickVisualMedia contract.
//When .launch()ed, this will display the photo picker.
val launcher = rememberLauncherForActivityResult(ActivityResultContracts.PickVisualMedia()) { uri ->
    //When the user has selected a photo, its URL is returned here
    photoUri = uri
}

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if (photoUri != null) {
    //Use Coil to display the selected image
    val painter = rememberAsyncImagePainter(
        ImageRequest
            .Builder(LocalContext.current)
            .data(data = photoUri)
            .build()
    )

    Image(

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//To allow the user to pick multiple files, use PickMultipleVisualMedia()
//in place of PickVisualMedia() below.
val launcher = rememberLauncherForActivityResult(ActivityResultContracts.PickVisualMedia()) { uri ->
    //When the user has selected a photo, its URI is returned here
}

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private val mainKeyAlias by lazy {
    // Although you can define your own key generation parameter specification, it's
    // recommended that you use the value specified here.
    val keyGenParameterSpec = MasterKeys.AES256_GCM_SPEC
    MasterKeys.getOrCreate(keyGenParameterSpec)
}

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private val sharedPreferences by lazy {
    //The name of the file on disk will be this, plus the ".xml" extension.
    val sharedPrefsFile = "sharedPrefs"

    //Create the EncryptedSharedPremises using the key above
    EncryptedSharedPreferences.create(
        sharedPrefsFile,
        mainKeyAlias,
        getApplication(),
        EncryptedSharedPreferences.PrefKeyEncryptionScheme.AES256_SIV,

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fun writeToSharedPrefs(value: String) {
    with (sharedPreferences.edit()) {
        putString("test", value)
        apply()
    }
}

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fun readFromSharedPrefs(): String? {
    return sharedPreferences.getString("test", "")
}

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private val encryptedFile by lazy {
    //This is the app's internal storage folder
    val baseDir = getApplication<Application>().filesDir

    //The encrypted file within the app's internal storage folder
    val fileToWrite = File(baseDir, "encrypted-file.txt")

    //Create the encrypted file
    EncryptedFile.Builder(
        fileToWrite,

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fun writeToEncryptedFile(content: String) {
    //Open the file for writing, and write our contents to it.
    //Note how Kotlin's 'use' function correctly closes the resource after we've finished,
    //regardless of whether or not an exception was thrown.
    encryptedFile.openFileOutput().use {
        it.write(content.toByteArray(StandardCharsets.UTF_8))
        it.flush()
    }
}