Get height & Width of screen

Deepak Kaligotla

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2 min read

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Nov 10, 2023

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px = dp * (dpi / 160) <==> dpi = density * 160
px = dp * density <==> dp = px/density <==> density = px/dp
Aspect Ratio = width / height

//curved screen size
base width = 2 × radius × sin(length / (2 × radius))

//how much display screen an application can use
(sqrt(height_pixel² + widthPx²))/dpi => inches

import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.padding
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.platform.LocalConfiguration
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
import java.lang.Math.pow
import java.math.RoundingMode
import kotlin.math.pow
import kotlin.math.sqrt


@Composable
fun FindWindowScreen() {

    val configuration = LocalConfiguration.current
    val heightDP = configuration.screenHeightDp
    val widthDP = configuration.screenWidthDp

    val context = LocalContext.current
    val displayMetrics = context.resources.displayMetrics
    val widthPx = displayMetrics.widthPixels
    val heightPx = displayMetrics.heightPixels
    val density = displayMetrics.density
    val dpi = displayMetrics.densityDpi

    val screenInches = sqrt((heightPx.toDouble().pow(2.0) +
            widthPx.toDouble().pow(2.0))).div(dpi.toDouble())
        .toBigDecimal().setScale(1, RoundingMode.HALF_UP).toFloat()

    fun calGCD(height: Int, width: Int): Int {
        if (width == 0)
            return height;
        return calGCD(width, height % width);
    }
    val gcd = calGCD(heightPx, widthPx)

    val pxStr = "Width : $widthPx px, $widthDP dp"
    val dpStr = "Height : $heightPx px, $heightDP dp"
    val densityStr = "Density: $density, dpi: $dpi"
    val screenSize = "Screen size: $screenInches\" inch"
    val aspectRatioStr = "Aspect Ratio - " + heightPx/gcd + ":" + widthPx/gcd

    Column(
        verticalArrangement = Arrangement.Center,
        horizontalAlignment = Alignment.End,
        modifier = Modifier.fillMaxWidth()
    ) {
        Text(
            modifier = Modifier
                .padding(end = 30.dp)
                .align(Alignment.End),
            text = pxStr+"\n"+dpStr+"\n"+densityStr+"\n"+aspectRatioStr+"\n"+screenSize,
            textAlign = TextAlign.Center,
            fontSize = 12.sp,
            lineHeight = 15.sp
        )
    }
}