Graphene.kt

package orllewin.osname

import android.content.Context
import android.content.pm.PackageManager

/**
 * Don't forget to add the packages to the manifest.xml:
    <manifest xmlns:android="http://schemas.android.com/apk/res/android" ... >
    <queries>
        <package android:name="app.grapheneos.camera" />
        <package android:name="org.grapheneos.pdfviewer" />
        <package android:name="app.grapheneos.gmscompat" />
    </queries>
    <application ...
 */
class Graphene(private val context: Context){

    fun isGraphene(): Boolean {
        return packageInstalled("app.grapheneos.camera") &&
                packageInstalled("org.grapheneos.pdfviewer") &&
                packageInstalled("app.grapheneos.gmscompat")
    }

    private fun packageInstalled(packageName: String): Boolean{
        return try{
            context.packageManager.getPackageInfo(packageName, PackageManager.GET_META_DATA)
            true
        }catch (e: PackageManager.NameNotFoundException){
            false
        }
    }
}