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@cedrickring
Last active January 9, 2024 15:25
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Draw a colored shadow in Android Jetpack Compose
/*
Copyright 2020 Cedric Kring.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
import androidx.compose.ui.Modifier
import androidx.compose.ui.drawBehind
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.Paint
import androidx.compose.ui.graphics.drawscope.drawIntoCanvas
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.dp
fun Modifier.drawColoredShadow(
color: Color,
alpha: Float = 0.2f,
borderRadius: Dp = 0.dp,
shadowRadius: Dp = 20.dp,
offsetY: Dp = 0.dp,
offsetX: Dp = 0.dp
) = this.drawBehind {
val transparentColor = android.graphics.Color.toArgb(color.copy(alpha = 0.0f).value.toLong())
val shadowColor = android.graphics.Color.toArgb(color.copy(alpha = alpha).value.toLong())
this.drawIntoCanvas {
val paint = Paint()
val frameworkPaint = paint.asFrameworkPaint()
frameworkPaint.color = transparentColor
frameworkPaint.setShadowLayer(
shadowRadius.toPx(),
offsetX.toPx(),
offsetY.toPx(),
shadowColor
)
it.drawRoundRect(
0f,
0f,
this.size.width,
this.size.height,
borderRadius.toPx(),
borderRadius.toPx(),
paint
)
}
}
@dev-rajshekhar
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Can you please suggest me how to achieve the Inner shadow.. like neumorphism design.

@arthurgonzaga
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arthurgonzaga commented Jul 3, 2021

For those who are using lower API versions check out an improved version:

https://gist.github.com/arthurgonzaga/598267f570e38425fc52f97b30e0619d

@Zhuinden
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android.graphics.Color.toArgb( requires API 26+

@MarioHBS
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Amazing, thanks !

@fatemeh-afshari
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@cedrickring I use this code and it works fine in emulator, but I does not work in real devices.
I put setLayerType(View.LAYER_TYPE_SOFTWARE, null) and set android:hardwareAccelerated="false" in my manifest, but still it is not working.
Note: I have tested it in 4 different devices

@awBSH
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awBSH commented Jul 4, 2022

Hello Cedric,
you gist is used in our code and I'd like to properly document and declare it according to FOSS guidelines.
Could you please tell me under which license you provided this sample code?
Cheers, Andy 👍

@cedrickring
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Author

@fatemeh-afshari I can't say which API versions exactly are supported or what's necessary to make it work on your devices. I tested it on my Samsung Galaxy S8 on which it worked perfectly fine. I'd be happy to update the snippet if you find a solution for your problem.

@awBSH Hey Andy, I added a basic license on top of the file. Feel free to use and distribute this snippet :)

@awBSH
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awBSH commented Jul 5, 2022

@cedrickring Hi Cedric, thank you very much 👍

@tasjapr
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tasjapr commented Sep 12, 2022

android.graphics.Color.toArgb( requires API 26+

you can use this version
https://gist.github.com/tasjapr/ed66e6ba1d70cc1c6ff65ae38500a7b4

@munisifyeshwanth
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color.copy(alpha = 0.0f).toArgb()

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