android-studio - Android studio kotlin，如何获取随机图像数组？

Question

我在drawable文件夹中有图像文件，命名如下：img1.png，img2.png，img3.png ... img16.png

有什么方法可以随机获取 5 张图像并将它们放入数组中？

标签： android-studiokotlin

Answer 1

随机整数并获取可绘制资源IDResources#getIdentifier

 fun getDrawables(context: Context): Array<Drawable> {
        val imgIndices = ArrayList<Int>()
        val drawables = ArrayList<Drawable>()
        while (imgIndices.size < 5) {
            val index = Random.nextInt(16)
            if (!imgIndices.contains(index)) {
                imgIndices.add(index)
            }
        }
        for (i in imgIndices) {
            val drawableRes = context.resources.getIdentifier("img${i + 1}", "drawable", context.packageName)
            val drawable = ContextCompat.getDrawable(context, drawableRes)
            drawable?.let {
                drawables.add(it)
            }
        }
        return drawables.toTypedArray();
    }