Android Compose使用AndroidView,并将 AndroidView 保存成图片。

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一、使用 AndroidView

//images 是一个 uri数组
    var androidView by remember { mutableStateOf<View?>(null) }
     AndroidView(factory = {
                        FrameLayout(it)
                            .apply {
                                layoutParams = ViewGroup.LayoutParams(
                                    ViewGroup.LayoutParams.WRAP_CONTENT,
                                    ViewGroup.LayoutParams.WRAP_CONTENT
                                )
                                val composeVIew = ComposeView(context)
                                post {
                                    composeVIew.setContent {
                                        LazyColumn(
                                            modifier = Modifier
                                                .padding(top = 10.dp, bottom = 10.dp)
                                                .width(179.dp)
                                                .height(parentHeight.dp),
                                            horizontalAlignment = Alignment.CenterHorizontally,
                                            verticalArrangement = Arrangement.Center
                                        ) {
                                            items(images) { image ->
                                                val painter: Painter =
                                                    rememberAsyncImagePainter(image)
                                                Box(
                                                    modifier = Modifier
                                                        .padding(top = 5.dp, bottom = 5.dp)
                                                        .size(147.dp, 147.dp)
                                                        .clip(
                                                            RoundedCornerShape(10.dp)
                                                        )
                                                        .background(color = Color.Transparent)
                                                ) {
                                                    if (selectFilter != null) {
                                                        loadBitmapFromUri(context,image)?.let { it1 ->
                                                            Image(
                                                                bitmap = it1.asImageBitmap() ,
                                                                contentDescription = null,
                                                                modifier = Modifier.fillMaxSize(),
                                                                contentScale = ContentScale.Crop,
                                                                colorFilter = ColorFilter.colorMatrix(
                                                                    ColorMatrix(selectFilter!!)
                                                                )
                                                            )
                                                        }
                                                    } else {
                                                        loadBitmapFromUri(context,image)?.let { it1 ->
                                                            Image(
                                                                bitmap = it1.asImageBitmap(),
                                                                contentDescription = null,
                                                                modifier = Modifier.fillMaxSize(),
                                                                contentScale = ContentScale.Crop
                                                            )
                                                        }
                                                    }


                                                }

                                            }
                                        }

                                      
                                    }

                                }
                                this.addView(composeVIew, layoutParams)
                                androidView = this
                            }

                    })

二、将 AndroidView保存成 bitmap：val bitmap = androidView?.let { saveAndroidViewToBitmapTwo(it) }

fun saveAndroidViewToBitmapTwo(view: View): Bitmap {
    view.measure(
        View.MeasureSpec.makeMeasureSpec(view.width, View.MeasureSpec.EXACTLY),
        View.MeasureSpec.makeMeasureSpec(view.height, View.MeasureSpec.EXACTLY)
    )
    view.layout(0, 0, view.measuredWidth, view.measuredHeight)

    val bitmap =
        Bitmap.createBitmap(view.measuredWidth, view.measuredHeight, Bitmap.Config.ARGB_8888)
    val canvas = android.graphics.Canvas(bitmap)
    view.draw(canvas)

    return bitmap
}

注意：当 AndroidView 中使用 Image组件是请注意，显示图片要使用 bitmap、或者资源文件，如果使用val painter: Painter = rememberAsyncImagePainter(image) //image是 Uri类型，会报错：java.lang.IllegalArgumentException: Software rendering doesn't support hardware bitmaps

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