Using context in KMM shared library (Manually)

Question

I am building a common library module in KMM that requires android application context.

How can I pass it to common module manually?

I have seen answers using androidx.startup.InitializationProvider which requires separate dependency.

I don't want any dependency.

Answer 1

Found a good solution using expect/actual mechanism of object.

1. Create an expect object in commonMain

expect object AppContext

2. Create actual object in androidMain

import android.content.Context
import java.lang.ref.WeakReference

actual object AppContext {

    private var value: WeakReference<Context?>? = null

    fun set(context: Context) {
        value = WeakReference(context)
    }

    internal fun get(): Context? {
        return value?.get()
    }

}

3. Leave iOS AppContext empty as we don't need context there

actual object AppContext

4. Create another class in commonMain

class MyLibConfig(
    val appContext: AppContext,
    val isTestDevice: Boolean = false,
    val isLogsEnabled: Boolean = false,
)

5. Create your commonMain public API object

object MyLib {
    fun initialize(config: MyLibConfig) {
        val commonContext = config.appContext
    }
}

6. Pass this context to your native platform specific methods as argument. For example

override fun getMyLibDatabase(appContext: AppContext): SqlDriver {
        return AndroidSqliteDriver(
            my_lib_db.Schema,
            appContext.get()!!,
            "my_lib_db.sqlite"
        )
    }

7. Initialize your library from ViewModel or Application class. Much more clear way

MyLib.initialize(
            MyLibConfig(
                appContext = AppContext.apply { set(application.applicationContext) },
                isTestDevice = true,
                isLogsEnabled = true,
            )
        )