openAppOrMarket()

openAppOrMarket.kt

/**
 * Open another app.
 *
 * source: https://stackoverflow.com/a/7596063/1006741
 *
 * @param packageName the full package name of the app to open
 */
fun Activity.openMainLauncherApp(packageName: String?) = with(packageManager.getLaunchIntentForPackage(packageName!!)!!) {
    addCategory(Intent.CATEGORY_LAUNCHER)
    startActivity(this)
}

fun String.openMainLauncherApp() = currentActivity?.openMainLauncherApp(this)

fun String.openMarket() = currentActivity?.openMarket(this)

fun Activity.openMarket(packageName: String) = try {
    startActivity(Intent(Intent.ACTION_VIEW, Uri.parse("market://details?id=$packageName")))
} catch (e: Exception) {
    startActivity(Intent(Intent.ACTION_VIEW, Uri.parse("https://play.google.com/store/apps/details?id=${packageName}")))
}

fun String.openAppOrMarket() = try {
    openMainLauncherApp()
} catch (e: Exception) {
    openMarket()
}

e.g. "net.kibotu.schlachtensee".openAppOrMarket()