Dynamic Icon value selector in Jetpack Compose-CodePudding

Is there a way to dynamically set an icon value in Jetpack Compose?

Example, instead of:

Icon(Icons.Filled.Print, "print")

I'd like to do:

Icon(Icons.Filled.(iconValue), iconValueName)

CodePudding user response：

You can use Java reflection. I rely on the fact that each material icon is placed in a separate file, and all of them are declared under androidx.compose.material.icons.filled package.

@Composable
fun IconByName(name: String) {
    val icon: ImageVector? = remember(name) {
        try {
            val cl = Class.forName("androidx.compose.material.icons.filled.${name}Kt")
            val method = cl.declaredMethods.first()
            method.invoke(null, Icons.Filled) as ImageVector
        } catch (_: Throwable) {
            null
        }
    }
    if (icon != null) {
        Icon(icon, "$name icon")
    }
}

You can check out this answer for more details how Kotlin extensions are compiled to Java code.

I would also write a test for this logic using a couple of icons, just in case Compose changes something in future releases - a package name or moving multiple icons together in the same file, although this is unlikely.

CodePudding user response：

You can then use a when statement and select appropriate image vector.

when(imageStringFromWeb) {
    is "email" -> {
        Icon(Icons.Filled.Email, null)
    }
    ...
}

Edited to simplfy the code.