how to use Coroutine in kotlin to call a function every second

Question

i just created an app where my function getdata() call every second to fetch new data from server and updateui() function will update view in UI i don't use any asynctask or coroutine in my app i wants to do this please tell me how i can do that.

here's my code...

private fun getdata(){
        try {
            val api = RetroClient.getApiService()
            call = api.myJSON
            call!!.enqueue(object : Callback<ProductResponse> {
                override fun onResponse(
                    call: Call<ProductResponse>,
                    response: Response<ProductResponse>
                ) {
                    if (response.isSuccessful) {
                        productList = response.body()!!.data
                        for (list in productList) {
                            if (list.BB.equals("AAA")) {
                                aProductList.add(list)
                            }
                        }
                        if (recyclerView.adapter != null) {
                            eAdapter!!.updatedata(aProductList)
                        }
                        updateui()
                    }
                }

                override fun onFailure(call: Call<ProductResponse>, t: Throwable) {
                    println("error")
                }
            })
        } catch (ex: Exception) {
        } catch (ex: OutOfMemoryError) {
        }
Handler().postDelayed({
            getdata()
        }, 1000)
}


private fun updateui() {
        try {
            //some code to handel ui
 } catch (e: NumberFormatException) {

        } catch (e: ArithmeticException) {

        } catch (e: NullPointerException) {

        } catch (e: Exception) {

        }
    }

Answer 1

it's not advisable to hit the server every second. if you need to get data continuously try the socket. Because some times your server takes more than a few seconds to respond to your request. Then all your requests will be in a queue..if you still need to try with this.

fun repeatFun(): Job {
    return coroutineScope.launch {  
        while(isActive) {
            //do your network request here
            delay(1000)
        }
    }
}

//start the loop
val repeatFun = repeatFun()

//Cancel the loop
repeatFun.cancel()