如何从 Jetpack compose 中的 drawable 加载图像?

问题描述

我已经尝试过下面的代码，但它在 UI 中没有任何反映，我在这里遗漏了什么?

class MainActivity : AppCompatActivity() {覆盖 fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)设置内容{加载Ui()}}@可组合有趣的加载Ui(){起重机包装{材料主题{图片((ResourcesCompat.getDrawable(资源，R.mipmap.ic_launcher,空值) 作为 BitmapDrawable).bitmap)}}}}

解决方案

使用 1.0.x 你可以使用

I have tried below code but it reflects nothing in the UI, I'm missing anything here?

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            loadUi()
        }
    }

    @Composable
    fun loadUi() {
        CraneWrapper {
            MaterialTheme {
                Image(
                    (ResourcesCompat.getDrawable(
                        resources,
                        R.mipmap.ic_launcher,
                        null
                    ) as BitmapDrawable).bitmap
                )
            }
        }
    }
}

解决方案

With 1.0.x you can use the painterResource function:

 Image(painterResource(R.drawable.ic_xxxx),"content description")

The resources with the given id must point to either fully rasterized images (ex. PNG or JPG files) or VectorDrawable xml assets.
It means that this method can load either an instance of BitmapPainter or VectorPainter for ImageBitmap based assets or vector based assets respectively.

Example:

Card(
    modifier = Modifier.size(48.dp).tag("circle"),
    shape = CircleShape,
    elevation = 2.dp
) {
    Image(
        painterResource(R.drawable.ic_xxxx),
        contentDescription = "",
        contentScale = ContentScale.Crop,
        modifier = Modifier.fillMaxSize()
    )
}

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