How Android Compose gets position and size.

    Box(modifier = Modifier.fillMaxSize(), contentAlignment = Alignment.Center) {
                GetPositionAndSizeExample()
            }

package com.example.test_new_virsion

import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.size
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.geometry.Rect
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.layout.boundsInParent
import androidx.compose.ui.layout.onGloballyPositioned
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp

@Composable
fun GetPositionAndSizeExample() {
    val boxRect = remember { mutableStateOf(Rect.Zero) }

    Box(
        modifier = Modifier
            .size(100.dp)
            .background(Color.Blue)
            .onGloballyPositioned { coordinates ->
                boxRect.value = coordinates.boundsInParent()
            },

        ) {
        Text(text = "Left: ${boxRect.value.left} Top: ${boxRect.value.top} Right: ${boxRect.value.right} Bottom: ${boxRect.value.bottom}")
    }


    // 这里可以使用 boxRect.value 获取到Box组件的位置和大小信息
    // boxRect.value.left - 左侧位置
    // boxRect.value.top - 顶部位置
    // boxRect.value.right - 右侧位置
    // boxRect.value.bottom - 底部位置
    // boxRect.value.width - 宽度
    // boxRect.value.height - 高度
}

@Preview(showBackground = true)
@Composable
fun GetPositionAndSizeExamplePreview() {
    MaterialTheme {
        GetPositionAndSizeExample()
    }
}

  boxRect.value = coordinates.boundsInParent() is for the current parent layout. If you want to target the entire phone, you can use

            val position = coordinates.positionInWindow()
                                val top =  position.y-StatusBarUtil.getStatusBarHeight(context)
                                viewModel.boxRect.value = Rect(
                                    left = position.x,
                                    top = top,
                                    right = position.x + coordinates.size.width,
                                    bottom = top + coordinates.size.height
                                )
                                LL.e(
                                    TAG,
                                    " \"Left: ${viewModel.boxRect.value.left} Top: ${viewModel.boxRect.value.top} Right: ${viewModel.boxRect.value.right} Bottom: ${viewModel.boxRect.value.bottom}\""
                                )

    //获取状态栏高度
    fun getStatusBarHeight(context: Context): Int {
        var result: Int = 0
        val resourceId: Int = context.getResources().getIdentifier(
            "status_bar_height", "dimen", "android"
        )
        if (resourceId > 0) {
            result = context.getResources().getDimensionPixelSize(resourceId)
        }
        return result
    }