Android Question How to extract wallpaper colors using Monet theme engine on Android 12?

Inman · Aug 17, 2022

As the title says, Android 12's Material You offers the ability to extract colors from a user's wallpaper and use it in your app. All major Google apps (and a few third party apps) have been updated to support this. Can we do this in B4A? Here is the relevant Java/Kotlin code.

How to use new Material You colors announced for Android 12

Google announced new colors personalization for Android 12 with the "Material You" design. How can we use these personalized colors from the application? First of all, I wonder how to use...

stackoverflow.com

tuhatinhvn · Aug 17, 2022

I think you can use inline java to get this color code (not tested because i dont use Android 12):

B4X:

//import androidx.compose.foundation.isSystemInDarkTheme;
//you can check is darkmode is set too!
import androidx.compose.ui.res.colorResource;

public int colorcodetest_mainDark700(){
return colorResource(android.R.color.system_accent1_700);
}
public int colorcodetest_secondary200(){
return colorResource(android.R.color.system_accent2_200);
}
public int colorcodetest_system_accent1_200(){
return colorResource(android.R.color.system_accent1_200);
}
public int colorcodetest_system_accent1_500(){
return colorResource(android.R.color.system_accent1_500);
}

Use:

B4X:

    Dim nt As JavaObject
    nt.InitializeContext
 Log("Color code is: &    nt.RunMethod("colorcodetest_mainDark700",Null) )

Inman · Aug 17, 2022

tuhatinhvn said:

I think you can use inline java to get this color code (not tested because i dont use Android 12):

B4X:

//import androidx.compose.foundation.isSystemInDarkTheme;
//you can check is darkmode is set too!
import androidx.compose.ui.res.colorResource;

public int colorcodetest_mainDark700(){
return colorResource(android.R.color.system_accent1_700);
}
public int colorcodetest_secondary200(){
return colorResource(android.R.color.system_accent2_200);
}
public int colorcodetest_system_accent1_200(){
return colorResource(android.R.color.system_accent1_200);
}
public int colorcodetest_system_accent1_500(){
return colorResource(android.R.color.system_accent1_500);
}

Use:

B4X:

    Dim nt As JavaObject
    nt.InitializeContext
 Log("Color code is: &    nt.RunMethod("colorcodetest_mainDark700",Null) )

Thanks. I tried your code but I am getting this error. I compiled against SDK 33 and set the targetsdkversion to 33 as well.

B4X:

error: cannot find symbol
return colorResource(android.R.color.system_accent1_700);
       ^
  symbol:   method colorResource(int)
  location: class main

tuhatinhvn · Aug 18, 2022

Can you try with

import androidx.compose.ui.res.ColorResources_androidKt;

?

Android Question How to extract wallpaper colors using Monet theme engine on Android 12?

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