How can I redirect from an activity to another activity after some delays?

Question

I'm a beginner to Kotlin language. I have trouble redirection to another activity after for example 4 seconds. I know how to do it in Java but I have no idea about Kotlin. I use android studio version 2019.

I tried android studio's converter (Java to Kotlin) I couldn't find an answer which lead me to an answer that could redirect me from an activity to another by DELAY. I'm not asking about other ways of redirecting I'm asking exactly about delay. I mean how to go to another page in an android program not clicking any button or something.

edit (Sep 13): unfortunately I'm still struggling with the problem. I tried to use this code but It doesn't work. Can you please tell me what is the problem: MainActivity.kt:

package com.rearaa.weading
import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.os.Handler

class MainActivity : AppCompatActivity() {

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)
}
val handler = Handler()
val runnable = Runnable {
    val i = Intent(this@MainActivity, MenuPage::class.java)
    startActivity(i)
}
handler.postDelayed(runnable, 4000)

}

In above code I want to redirect from MainActivity to MenuPage.

If you used the Android Studio auto converter. Then what didn't work? — EpicPandaForce, Aug 19 '19 at 12:38
Possible duplicate of [How to pass the values from activity to another activity in kotlin](https://stackoverflow.com/questions/45157567/how-to-pass-the-values-from-activity-to-another-activity-in-kotlin) — Swaminathan V, Aug 19 '19 at 12:40
there are basically 2 different tasks: 1) run code after some delay; 2) redirect to another activity. So which one is a problem? — Vladyslav Matviienko, Aug 19 '19 at 12:41
@EpicPandaForce I don't know! maybe conversion is not fully correct bcz I get some erros. — shirazy, Aug 19 '19 at 12:56
@RaguSwaminathan no it's not. there is no answer there for my "delay" question. — shirazy, Aug 19 '19 at 12:58

score 3 · Accepted Answer · answered Aug 19 '19 at 12:41

3

This how you can do it in android using Kotlin

private lateinit var mHandler: Handler
private lateinit var mRunnable: Runnable

Function :

private fun startMainActivity() {


    mRunnable = Runnable {
        startActivity(Intent(this, MainActivity::class.java))
        finish()
    }

    mHandler = Handler()

    mHandler.postDelayed(mRunnable, 4000)
}

Remove Callbacks:

override fun onStop() {
    super.onStop()
    mHandler.removeCallbacks(mRunnable)
}

answered Aug 19 '19 at 12:41

Jaymin

2,879
3
19
35

MainActivity is the second page? – shirazy Aug 19 '19 at 13:23
1

Yes, it is the second activity. – Jaymin Aug 19 '19 at 13:28
sorry, where should I use the function? – shirazy Aug 19 '19 at 13:39
1

You should write this function in the activity. – Jaymin Aug 19 '19 at 15:19

score 2 · Answer 2 · answered Aug 19 '19 at 12:42

2

Use a Handler().postDelayed().
For example:

Handler().postDelayed({
      startActivity(Intent(this, SecondActivity::class.java))
    }, 4000); //4 Seconds

answered Aug 19 '19 at 12:42

Darshan

4,020
2
18
49

I get this error: function declaration must have a name – shirazy Aug 19 '19 at 13:28

score 1 · Answer 3 · answered Aug 19 '19 at 12:40

1

Try this.

   val r = Runnable {
         //start your activity here
    }
    Handler().postDelayed(r, 3000)

3000 is delay time , you can change it to any value that you want.

answered Aug 19 '19 at 12:40

Furqan Khan

528
4
14

score 1 · Answer 4 · answered Aug 19 '19 at 12:41

There are so many ways one of them is

 private lateinit var handler: Handler

Here is the function

 override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        handler = Handler()

        handler.postDelayed(object : Runnable {
            override fun run() {


                startActivity(
                    Intent(
                        this@SplashActivity,
                          LoginActivity::class.java
                    )
                )

                finish()


            }
        }, timeDelay)


    }

    override fun onDestroy() {
        super.onDestroy()
        handler.removeCallbacksAndMessages(null)
    }

score 1 · Answer 5 · answered Aug 19 '19 at 12:42

You can use Schedule

inline fun Timer.schedule(
    delay: Long, 
    crossinline action: TimerTask.() -> Unit
): TimerTask (source)

found it here: http://jamie.mccrindle.org/2013/02/exploring-kotlin-standard-library-part-3.html) import java.util.Timer import kotlin.concurrent.schedule

Timer("SettingUp", false).schedule(500) { 
   doSomething()
}

score 1 · Answer 6 · answered Aug 19 '19 at 12:42

1

shortest sample:

        Handler().postDelayed({ startActivity(yourIntent()) }, 4000L)

answered Aug 19 '19 at 12:42

Dmitriy Pavlukhin

401
5
15

score 1 · Answer 7 · answered Aug 19 '19 at 12:51

1

Redirect to another activity(FirstActivity) from MainActivity after 4 second:

val handler = Handler()
        val runnable = Runnable {
            val i = Intent(this@MainActivity, FirstActivity::class.java)
            startActivity(i)
        }
        handler.postDelayed(runnable, 4000)

answered Aug 19 '19 at 12:51

Jignesh Mayani

6,937
1
20
36

I get the error "Expecting member declaration". Then what should I do? – shirazy Sep 09 '19 at 12:34

How can I redirect from an activity to another activity after some delays?

7 Answers7