使用此LoadThumbnail方法，通过coil加载图像/视频缩略图：

@Composable
fun LoadThumbnail(
    mediaPath: String,
    isVideo: Boolean,
    modifier: Modifier = Modifier
) {
    val context = LocalContext.current
    if (isVideo) {
        val imageLoader = remember {
            ImageLoader.Builder(context)
                .memoryCachePolicy(CachePolicy.ENABLED)
                .diskCachePolicy(CachePolicy.ENABLED)
                .respectCacheHeaders(true)
                .components {
                    add(VideoFrameDecoder.Factory())
                }
                .crossfade(true)
                .build()
        }
    val painter = rememberAsyncImagePainter(
        model = mediaPath,
        imageLoader = imageLoader,
    )
    if (painter.state is AsyncImagePainter.State.Loading) {
        Image(
            painter = painterResource(id = R.drawable.ic_default_thumbnail),
            contentDescription = null,
            modifier = modifier,
            contentScale = ContentScale.Crop,
        )
    }
    Image(
        painter = painter,
        contentDescription = stringResource(id = R.string.thumbnail),
        contentScale = ContentScale.Crop,
        modifier = modifier
    )
} else {
    AsyncImage(
        model = mediaPath,
        contentDescription = stringResource(id = R.string.thumbnail),
        modifier = modifier,
        contentScale = ContentScale.Crop,
        placeholder = painterResource(id = R.drawable.ic_default_thumbnail),
        error = painterResource(id = R.drawable.ic_default_thumbnail)
    )
}
}