Android テンプレ for BPS

DateBindingAdapter.kt

// java.util.Date をいい感じにフォーマットして表示するやつ
@BindingAdapter("date")
fun TextView.setDate(date: Date?): Unit {
    if (createdAt == null) return

    // android.text.format.DateFormat を使うよ
    val formatedDate = DateFormat.format("yyyy.MM.dd kk:mm", date)
    this.text = formatedDate
}

ImageBindingAdapter.kt

// BindingAdapter で画像を便利に表示するやつ with Picasso
@BindingAdapter(value = *arrayOf("imageUrl", "isCircle"), requireAll = false)
fun ImageView.setImageUrl(url: String?, isCircle: Boolean = false): Unit {
    if (url.isNullOrBlank()) return

    if (isCircle) {
        Picasso.with(this.context).load(url).transform(CircleTransformation()).into(this)
        return
    }

    Picasso.with(this.context).load(url).into(this)
}

// 参考:https://androidmads.blogspot.jp/2017/06/circle-image-view-using-glide-and.html
class CircleTransformation : Transformation {

    override fun transform(source: Bitmap): Bitmap {
        val size = Math.min(source.width, source.height)

        val x = (source.width - size) / 2
        val y = (source.height - size) / 2

        val squaredBitmap = Bitmap.createBitmap(source, x, y, size, size)
        if (squaredBitmap != source) {
            source.recycle()
        }

        val bitmap = Bitmap.createBitmap(size, size, source.config)

        val canvas = Canvas(bitmap)
        val paint = Paint()

        val shader = BitmapShader(squaredBitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP)
        paint.setShader(shader)
        paint.setAntiAlias(true)

        val r = size / 2f
        canvas.drawCircle(r, r, r, paint)

        squaredBitmap.recycle()
        return bitmap
    }

    override fun key(): String = "circle"
}